Nonmarine Stratigraphic Successions in the Yidun Terrane

NONMARINE STRATIGRAPHIC SUCCESSIONS IN THE YIDUN TERRANE:

A RECORD OF MESOZOIC AND EARLY CENOZOIC DEFORMATION

AND DEPOSITION IN THE EASTERN TIBETAN PLATEAU

WILLIAM T. JACKSON, JR.

DELORES M. ROBINSON, COMMITTEE CHAIR AMY L. WEISLOGEL SAMANTHA E. HANSEN REZENE MAHATSENTE MATTHEW M. WIELICKI

A DISSERTATION

Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Geological Sciences in the Graduate School of The University of Alabama

TUSCALOOSA, ALABAMA

2017

ABSTRACT

The Tibetan Plateau is the largest and highest plateau on Earth, covering > 2,500,000 km2 with an average elevation > 4,500 m. The plateau’s present crustal configuration is a product of the Early Cenozoic India-Asia collision as well as similar Mesozoic collisions along the southern margin of Eurasia. The spatial and temporal relationship of Mesozoic and Early Cenozoic deformation resulting from collisions are required parameters to advance understanding of the plateau’s rise and outgrowth evolution. Nonmarine strata in interior parts of the plateau provide records of this deformation; however, in the eastern Tibetan Plateau these strata remain unexplored. This dissertation presents structural and sedimentological field data, detrital zircon

U-Pb geochronology and Hf isotope geochemistry, as well as petrology data from the Mula basin, west Ganzi basin, east Ganzi basin, and Ganzi-Litang suture to determine the stratigraphic age, sedimentary provenance, and tectonic setting of the nonmarine strata in the Yidun terrane, eastern Tibetan Plateau.

Weighted mean averages from the youngest detrital zircon age populations suggest that the Mula basin and nonmarine strata in the Ganzi-Litang suture are Early Cenozoic, while the west Ganzi basin and east Ganzi basin are Mesozoic. Sedimentary provenance analyses show that Early Cenozoic strata were sourced locally, whereas Mesozoic strata indicate regional sourcing. Basin-bounding fault characteristics demonstrate that deformation and nonmarine deposition were associated with compressional tectonic settings for both the Mesozoic and

Cenozoic basins. Integration of data from this dissertation illustrates that a fold-thrust belt developed in Mesozoic and Early Cenozoic time near the Late Triassic Ganzi-Litang suture

ii throughout the eastern Yidun terrane. The Late Triassic Ganzi-Litang suture was structurally reactivated by subsequent Mesozoic and Cenozoic collisions along the southern margin of

Eurasia, suggesting that the spatial evolution of deformation in the eastern Tibetan Plateau was controlled by the presence of crustal weaknesses. In addition, this dissertation establishes the stratigraphic architecture for nonmarine strata in the Yidun terrane, providing the stimulus for regional correlations that further clarify the timing and style of deformation throughout the eastern Tibetan Plateau.

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DEDICATION

To Mary Claire and Foster.

LIST OF ABBREVIATIONS AND SYMBOLS

BSE back-scattered electron cm centimeter(s)

EGB east Ganzi basin

GLS Ganzi-Litang suture

GSA Geological Society of America

Hf hafnium km kilometer(s)

LA-ICP-MS Laser Ablation Inductively Coupled Plasma Mass Spectrometry m meter(s)

Ma million years ago

µm micrometer(s)

MSWD mean sum of weighted deviations

Pb lead ppm parts per million

U uranium

WGB west Ganzi basin

% percentage

° degrees

σ sigma

> greater than

< less than

≥ greater than or equal to

≤ less than or equal to

~ approximately

± plus or minus

ACKNOWLEDGMENTS

I would like to thank the many individuals and organizations who provided support and guidance during this dissertation. I would especially like to thank my advisor, Delores M.

Robinson. Over the past five years, “D” offered motivation, encouragement, and friendship at all times. Without her mentorship this dissertation would not have been possible. Amy L. Weislogel provided support in the field, at professional conferences as well as through editorial critiques.

Committee members Samantha E. Hansen, Rezene Mahatsente, and Matthew M. Wielicki provided valuable feedback. Alison Duvall and Alberto Perez-Huerta contributed from the infancy of this dissertation to the final products. Fei Shang and Xing Jian provided assistance in the field and discussions on the geology of East Tibet. Work permits were arranged by

Chunmiao Zheng.

This research was funded by National Science Foundation grants awarded to Delores M.

Robinson (EAR-1119266) and Amy L. Weislogel (EAR-1119219). Additional funding was provided by the Geological Society of America, The University of Alabama’s Graduate School,

Department of Geological Sciences, and the Geological Science Advisory Board. Analytical support was provided by the Central Analytical Facility at The University of Alabama and the

LaserChron Center at University of Arizona.

I would also like to extend my gratitude towards the staff at the Geological Survey of

Alabama for supporting the completion of this dissertation, especially G. Daniel Irvin and B. H.

(Nick) Tew, Jr.

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CONTENTS

ABSTRACT ………………………………………………………………………………. ii

DEDICATION ……………………………………………………………………………. iv

LIST OF ABBREVIATIONS AND SYMBOLS………………………………………….. v

ACKNOWLEDGMENTS ………………………………………………………………… vii

LIST OF TABLES ………………………………………………………………………... xiii

LIST OF FIGURES ……………………………………………………………………….. xiv

CHAPTER 1: INTRODUCTION ………………………………………………………… 1

1.1. Mesozoic Tectonic History of the Tibetan Plateau …………………………………... 2

1.2. Cenozoic Tectonic History of the Tibetan Plateau …………………………………… 4

1.3. Objective ……………………………………………………………………………… 5

1.4. Outline ………………………………………………………………………………... 8

References ………………………………………………………………………………… 10

CHAPTER 2: EARLY CENOZOIC DEVELOPMENT OF THE NONMARINE MULA BASIN, SOUTHERN YIDUN TERRANE: DEPOSITION AND DEFORMATION IN THE EASTERN TIBETAN PLATEAU RESULTING FROM THE INDIA-ASIA COLLISION ……………………………………………………………………………… 16

2.1. Abstract ………………………………………………………………………………. 16

2.2. Introduction …………………………………………………………………………... 17

2.3. Geologic Setting ……………………………………………………………………… 21

2.4. Previous Work ………………………………………………………………………... 22

2.4.1. Southern Tibetan Plateau …………………………………………………… 23

viii

2.4.2. Central Tibetan Plateau …………………………………………………...... 23

2.4.3. North-Central Tibetan Plateau ……………………………………………… 24

2.4.4. East-Central Tibetan Plateau ……………………………………………….. 24

2.4.4. Eastern Tibetan Plateau …………………………………………………….. 25

2.4.5. Northeastern Tibetan Plateau ……………………………………………….. 25

2.5. Methods ………………………………………………………………………………. 25

2.5.1. Field Procedures ……………………………………………………………. 25

2.5.2. Detrital Zircon Geochronology …………………………………………….. 26

2.5.3. Detrital Zircon Hf Isotopes …………………………………………………. 27

2.5.4. Petrology ……………………………………………………………………. 28

2.6. Results ………………………………………………………………………………... 28

2.6.1. Mula Basin Stratigraphy …………………………………………………..... 28

2.6.2. Detrital Zircon Geochronology …………………………………………….. 29

2.6.3. Detrital Zircon Hf Analysis ………………………………………………… 30

2.6.4. Petrology ……………………………………………………………………. 31

2.6.5. Structure ……………………………………………………………………. 31

2.7. Interpretations ………………………………………………………………………… 38

2.7.1. Depositional Environments ………………………………………………… 38

2.7.2. Age of Strata ………………………………………………………………... 38

2.7.3. Sedimentary Provenance …………………………………………………… 38

2.7.4. Tectonic Setting …………………………………………………………….. 43

2.8. Discussion …………………………………………………………………………….. 43

2.8.1. Sediment Provenance, Stratigraphic Age, and Regional Correlation ………. 43

2.8.2. Tectonic Model ……………………………………………………………... 44

2.8.3. Broader Implications ……………………………………………………….. 44

2.9. Conclusions …………………………………………………………………………... 45

Acknowledgments ………………………………………………………………………… 46

References ………………………………………………………………………………… 47

CHAPTER 3: MESOZOIC DEVELOPMENT OF NONMARINE BASINS IN THE NORTHERN YIDUN TERRANE: DEPOSITION AND DEFORMATION IN THE EASTERN TIBTENA PLATEAU PRIOR TO THE INDIA-ASIA COLLISION ……….. 56

3.1. Abstract ……………………………………………………………………………….. 56

3.2. Introduction ………………………………………………………………………...... 56

3.3. Geologic Setting ……………………………………………………………………… 59

3.3.1. Yidun Terrane ………………………………………………………………. 59

3.3.2. Songpan-Ganzi Terrane …………………………………………………….. 61

3.4. Methods ………………………………………………………………………………. 61

3.4.1. Field Procedures ……………………………………………………………. 61

3.4.2. Detrital Zircon Geochronology …………………………………………….. 62

3.4.3. Thin Section Petrology ……………………………………………………... 63

3.5. Results ………………………………………………………………………………... 63

3.5.1. Stratigraphy ………………………………………………………………… 63

3.5.2. Basin Boundaries and Structure ……………………………………………. 66

3.5.3. Detrital Zircon Geochronology …………………………………………….. 68

3.5.4. Petrology Analysis …………………………………………………………. 76

3.6. Interpretations ………………………………………………………………………… 76

3.6.1. Depositional Environments ………………………………………………… 76

3.6.2. Age of Strata ………………………………………………………………... 77

3.6.3. Sediment Provenance ………………………………………………………. 79

3.6.4. Tectonic Setting …………………………………………………………….. 82

3.7. Discussion …………………………………………………………………………….. 83

3.7.1. Tectonic Model ……………………………………………………………... 83

3.7.2. Mesozoic vs Cenozoic Yidun Terrane Nonmarine Basins …………………. 87

3.7.3. Broader Implications ……………………………………………………….. 88

3.8. Conclusions …………………………………………………………………………... 88

Acknowledgments ………………………………………………………………………… 89

References ………………………………………………………………………………… 90

CHAPTER 4: EARLY CENOZOIC REACTIVATION OF THE TRIASSIC GANZI- LITANG SUTURE RECORDED BY DETRITAL ZIRCON GEOCHRONOLOGY: IMPLICATIONS FOR STRAIN PARTITIONING IN THE EASTERN TIBETAN PLATEAU ………………………………………………………………………………… 95

4.1. Abstract ……………………………………………………………………………….. 95

4.2. Introduction …………………………………………………………………………... 96

4.3. Geologic Background ………………………………………………………………… 97

4.4. Methods ………………………………………………………………………………. 99

4.4.1. Field Measurements ………………………………………………………… 99

4.4.2. Detrital Zircon Geochronology and Hf Isotope Geochemistry …………….. 100

4.5. Results ………………………………………………………………………………... 101

4.5.1. Ganzi-Litang Suture ………………………………………………………... 101

4.5.2. Nonmarine Strata …………………………………………………………… 102

4.5.3. Detrital Zircon Geochronology and Hf Isotopes …………………………… 102

4.6. Interpretation …………………………………………………………………………. 103

4.6.1. Depositional Environment, Age, and Provenance of Nonmarine Strata …… 103

4.6.2. Tectonic Setting …………………………………………………………….. 113

4.7. Discussion …………………………………………………………………………….. 114

4.7.1. Tectonic Model ……………………………………………………………... 114

4.7.2. Broader Implications ……………………………………………………….. 115

4.8. Conclusions …………………………………………………………………………... 116

Acknowledgments ………………………………………………………………………… 117

References ………………………………………………………………………………… 118

CHAPTER 5: CONCLUSIONS ………………………………………………………….. 122

References ………………………………………………………………………………… 126

APPENDIX I ……………………………………………………………………………… 128

APPENDIX II ……………………………………………………………………………... 142

APPENDIX III ……………………………………………………………………………. 186

APPENDIX IV ……………………………………………………………………………. 188

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LIST OF TABLES

4.1. Hf isotope values for Ganzi-Litang suture nonmarine strata …………………………. 110

xiii

LIST OF FIGURES

1.1. Tectonic map of the Tibetan Plateau ……………………………………………………. 6

1.2. Generalized geologic map of the Yidun terrane and surrounding region ………………. 7

2.1. Tectonic map of the Tibetan Plateau showing location of Cenozoic nonmarine strata …………………………………………………………………………... 19

2.2. Geologic map of the Mula basin region ……………………………………………… 20

2.3. Generalized stratigraphic column for the Mula basin ………………………………... 32

2.4. Field photos of Mula basin nonmarine strata ………………………………………… 33

2.5. Detrital zircon geochronology for Mula basin nonmarine strata …………………….. 34

2.6. Hf isotope values for Triassic Yidun Group turbidite rock and Mula Basin nonmarine strata …………………………………………………………………..... 35

2.7. Ternary diagram plots of thin section petrology ……………………………………... 36

2.8. Mula basin cross sections A-Aʹ, B-Bʹ, and C-Cʹ ……………………………………... 37

2.9. Weighted mean average plots of the youngest detrital zircon age populations ……… 41

2.10. Regional detrital zircon geochronology correlations ……………………………….. 42

3.1. Tectonic map of the Yidun terrane showing study area ……………………………… 58

3.2. Stratigraphic columns for the WGB and EGB ……………………………………….. 64

3.3. Field photos of WGB and EGB nonmarine strata ……………………………………. 65

3.4. Conglomerate clast counts from WGB and EGB nonmarine strata ………………….. 69

3.5. Geologic map of the WGB and EGB region …………………………………………. 70

3.6. Interpretation and description of WGB and EGB basin boundaries …………………. 71

3.7. Stereographic projections, field photos, and schematic cross sections

xiv illustrating the structural relationships of the WGB and EGB ……………………………. 72

3.8. Detrital zircon geochronology for WGB and EGB nonmarine strata ……………….. 73

3.9. Ternary diagram plots of thin section petrology ……………………………………... 74

3.10. Weight mean average plot of youngest detrital zircon populations ………………… 78

3.11. Histogram distribution plots and cumulative density curves illustrating Regional correlation of nonmarine ………………………………………………………... 84

3.12. Histogram plots of possible igneous pluton sources ………………………………... 85

3.13. Tectonic model for WGB and EGB development …………………………………... 86

4.1. Tectonic map of the Yidun terrane showing study area ……………………………… 98

4.2. Geologic map of the GLS …………………………………………………………….. 104

4.3. Field photos illustrating GLS rock type ……………………………………………… 105

4.4. Bounding fault along the eastern flank of the GLS …………………………………... 106

4.5. Conglomerate clast counts from GLS nonmarine strata ……………………………… 107

4.6. Detrital zircon geochronology for GLS nonmarine strata ……………………………. 108

4.7. Weighted mean average plot of the youngest detrital zircon age population ………… 109

4.8. Histogram distribution plots and cumulative density curves illustrating regional correlation of nonmarine strata …………………………………………………... 111

CHAPTER 1:

INTRODUCTION

Understanding the evolution of continent-continent collisions is a primary focus of tectonic studies. Interest stems from the direct influence that continent-continent collisions have on processes such as mountain building, creation of supercontinents, biogeographic evolution, and global climate [An et al., 2001; Hatcher, 2002; Clift et al., 2008; Whipple, 2009; Molnar et al., 2010]. The youngest continent-continent collision on Earth is the Himalaya-Tibet orogenic system, a product of the India-Asia collision [Molnar and Tapponnier, 1975; Dewey et al., 1988;

Yin and Harrison, 2000; Royden et al., 2008; Wang et al., 2008]. The orogenic system consists of the Himalaya Mountains to the south and the Tibetan Plateau to the north. Covering an area >

2,500,000 km2 with an average elevation of > 4,500 m, the Tibetan Plateau is the largest and highest plateau on Earth (Figure 1.1). Associated with the plateau’s uniform and high elevations, the crust beneath south-central Tibet is ~ 70-80 km thick, twice that of normal continental crust

[Zhao et al., 2001; Rai et al., 2006].

In general, end-member models describing Cenozoic plateau outgrowth include: 1) underthrusting of the Indian lithosphere beneath Eurasia [Powell, 1986; Zhao and Morgan, 1987;

Owens and Zandt, 1997; DeCelles et al., 2002; Nabelek et al., 2009], 2) rigid-block indentation and shortening [Molnar and Tapponnier, 1975; Tapponnier et al., 1982; 2001; Thatcher, 2007;

Meade, 2007], 3) continuum deformation [England and McKenzie, 1982; England and

Houseman, 1986; 1989; Dewey et al., 1988; Molnar et al., 1993; Dayem et al., 2009] , and 4) crustal flow [Royden et al., 1997; 2008; Clark and Royden, 2000; Clark et al., 2005; Ouimet et

1 al., 2010]. While these models are useful in describing first-order tectonic processes, the greater

Tibetan Plateau likely developed as a combination of processes implicated by each end-member model, though the data is insufficient to determine the rates and magnitude of plateau outgrowth.

Many of these models incorporate hypotheses that assume development of the Tibetan Plateau is solely a product of the Early Cenozoic India-Asia collision [Najman, 2006; Wang et al., 2006;

Garzanti, 2008; Copley et al., 2010]. However, Mesozoic collisions have been shown to be similar in nature, magnitude, and duration to the Cenozoic India-Asia collision, contributing to the development of the plateau [Murphy et al., 1997; Yin and Harrison, 2000; Kapp et al., 2003;

2005; DeCelles et al., 2007]. Unfortunately, the Mesozoic crustal characteristics and structural configuration remain poorly documented [Burchfiel and Chen, 2012]. To enhance models of plateau outgrowth, investigation of Mesozoic-Early Cenozoic rock record throughout the Tibetan

Plateau is required, thus providing the stimulus for this dissertation.

1.1. Mesozoic Tectonic History of the Tibetan Plateau

Lithosphere of the Tibetan Plateau consists of the Songpan-Ganzi, Yidun, Qiangtang, and

Lhasa terranes, from north to south (Figure 1.1). These terranes contain Precambrian basement rocks overlain by Neoproterozoic-Mesozoic sedimentary cover. Terranes are separated by

Mesozoic suture zones, defined by ophiolite and mélange rock sequences, which represent the remnants of the Paleo- and Meso-Tethys ocean basins [Sengor, 1984].

During Late Paleozoic and Mesozoic time, terranes separated from Gondwana, migrated through Paleo- and Meso-Tethys oceans, and collided with the southern margin of Eurasia

[Dewey et al., 1988; Metcalf, 2013]. The Qiangtang terrane separated from Gondwana during

Permian time [Metcalf, 2013; and references therein]. The Qiangtang terrane then migrated northward via closure of the Paleo-Tethys ocean, and ultimately collided with the Zhongza

2 Massif during Early-Middle Triassic time [Reid et al., 2005]. The Zhongza Massif consists of a metamorphosed Paleozoic passive margin sequence of rocks and was rifted from either the South

China block (Yangtze) or North China block (Kunlun terrane) during Permian time [Zhang et al.,

1998; Pullen et al., 2008; Ding et al., 2013]. Today the Zhongza Massif crops out along the western portion of the Yidun terrane. Based on structural analyses, Reid et al. [2005] suggest eastward subduction of the northern Qiangtang terrane beneath the Zhongza Massif. However, subduction polarity remains a debated topic [Burchfiel and Chen, 2012].

The Songpan-Ganzi terrane is positioned between the Qiangtang-Yidun and North China block (Figure 1.1). The Songpan-Ganzi terrane consists predominantly of Middle to Late Triassic turbidite rocks (10-15 km thick), covering an area of > 200,000 km2 [Nei et al., 1994; Zhou and

Graham, 1996]. Detrital zircon geochronology show that the Songpan-Ganzi terrane exhibits three distinct depocenters, sourced from various South China, North China, and Qinling-Dabie provinces [Weislogel et al., 2006; 2010; Enkelman et al., 2007]. Further detrital zircon and Hf isotope data suggest that turbidite rock from the southeastern Songpan-Ganzi terrane and Yidun terrane were connected as a large regional depocenter during Late Triassic time [Weislogel et al.,

2010; Ding et al., 2013; Wang et al., 2013; Jian et al., 2014; 2015]. These turbidite sequences were deposited in the eastern branch of the Paleo-Tethys oceanic crust, likely on top of oceanic crust [Zhou and Graham, 1996; Weislogel et al., 2006].

The Lhasa terrane, located to the south of the Qiangtang terrane, forms the south-central part of the Tibetan Plateau [Dewey et al., 1988]. The Lhasa terrane separated from Gondwana during Triassic time [Yin and Harrison, 2000; Metcalf, 2013 and references therein]. After separation, the Lhasa terrane migrated northward as crust of the Meso-Tethys Ocean subducted southward beneath it, until final closure of the Meso-Tethys and collision of the Lhasa terrane

3 with the southern margin of the Qiangtang terrane in Middle-Late Cretaceous time [Kapp et al.,

2003; 2005; 2007; Guynn et al., 2006]. Collision between the Lhasa and Qiangtang terranes is marked by the Bangong-Nujiang suture [Dewey et al., 1988; Yin and Harrison, 2000; Kapp et al., 2005].

1.2. Cenozoic Tectonic History of the Tibetan Plateau

India was the most recent terrane to separate from the remints of Gondwana and collide with the southern margin of Eurasia [Molnar and Tapponnier, 1975; Dewey et al., 1988; Yin and

Harrison, 2000; Gehrels et al., 2011]. Prior to the India-Asia collision, northward subduction of the Neo-Tethys along the southern margin of the Lhasa terrane resulted in the development of the Gangdese magmatic arc [Scharer and Allegre, 1984; Copeland et al., 1995; Chung et al.,

2005; Chu et al., 2006; Zhao et al., 2012]. India-Asia continent-continent collision began ~ 55-

60 Ma [Garzanti et al., 1987; Rowley, 1996; 1998; Najman et al., 2008; 2010; Cai et al., 2011;

DeCelles et al., 2014; Orme et al., 2015; Hu et al., 2015; Metcalf and Kapp, 2017]. During Early

Cenozoic time, convergence was expressed through crustal shortening and the initiation of large lithospheric fragments being extruded eastward and southeastward away from central Tibet

[Tapponnier et al., 1982; 2001; Akciz et al., 2008; Yin, 2010].

From ~ 15-20 Ma, as the India-Asia collision continued, the pattern of large-scale deformation caused rapid uplift of the eastern part of the Tibetan Plateau and the onset of east- west extension in the central plateau [Armijo et al., 1986; Yin et al., 1994; Taylor et al., 2003;

Duvall et al., 2013]. Lithospheric fragments continued to be extruded eastward and southeastward at this time [Wang et al., 1998; Zhang et al., 2004]. In East Tibet, extrusion manifests as diverted upper-crust of central and eastern Tibet around the rigid lithosphere beneath the Sichuan basin [e.g., Clark et al., 2005]. The boundary of crustal extrusion is marked

4 by clockwise rotation and left-lateral slip along the Xianshuihe fault, which became active ~ 8-10

Ma [Allen et al., 1991; Xu et al., 2000; Wang et al., 2008].

1.3. Objective

An arcuate belt of primarily Paleogene nonmarine strata spans ~ 2000 km from north- central Tibet through southeastern Tibet [BGMRSP, 1991; Liu et al., 2001]. Horton et al. [2004] suggest that the best approach to characterizing the Mesozoic-Early Cenozoic spatial and temporal distribution of deformation is through investigation of these nonmarine stratigraphic successions throughout interior parts of the plateau. Previous studies on nonmarine strata suggest

Late Cretaceous through Eocene ages [Liu and Wang, 2001; Liu et al., 2001; Horton et al., 2002;

DeCelles et al., 2007; Leier et al., 2007a; 2007b; Dai et al., 2012; Staisch et al., 2014]; however, precise dating of these nonmarine strata is difficult because of the lack of dateable fossils, regional stratigraphic correlations, and interlayered/intrusive rock as well as multiple generations of deformation [e.g., Horton et al., 2004; Spurlin et al., 2005; Studnicki-Gizbert et al., 2008].

Because of the remoteness, high topography, and unpredictable politics, nonmarine strata in East Tibet remain underexplored. Therefore, the objective of this dissertation is to determine the stratigraphic age, depositional environment, sedimentary provenance, and tectonic setting for nonmarine strata in the Yidun terrane. Determining the tectonic history of nonmarine sedimentation in the Yidun terrane will provide an understanding of deformation and deposition in East Tibet, establish regional stratigraphic descriptions that can be compared to other nonmarine strata throughout the plateau, and show how Mesozoic deformation influences the

Cenozoic development of the Tibetan Plateau.

Figure 1.1. Tectonic map of the Himalaya-Tibet orogenic system, illustrating the geographic distribution of topography, prominent faults, and suture zones. Adapted from Yin and Harrison [2000] and Horton et al. [2002].

Figure 1.2. Generalized tectonic map of the Yidun terrane and surrounding regions highlighting plutonic bodies, Paleo-Tethys suture zones, the Zhongza Massif, and location of nonmarine strata. Adapted from B.G.M.R.S.P. [1991].

7 1.4. Outline

This dissertation consists of three manuscripts, each designed to be published as peer- reviewed journal articles. The three manuscript chapters are bracketed by an introduction and conclusions chapter. Approximately sixteen weeks of field mapping and sample collection in western Sichuan Province, China was undertaken in 2013 and 2014 to provide the data.

Chapter 2, entitled “Early Cenozoic development of the nonmarine Mula basin, southern

Yidun terrane: deposition and deformation in East Tibet resulting from the India-Asia collision”, is co-authored by Delores M. Robinson, Amy L. Weislogel, Xing Jian, and Matthew P. McKay.

The manuscript focuses on the Mula basin, located in the southern Yidun terrane (Figure 1.2).

This study presents structural and sedimentological field measurements, stratigraphic architecture of the basin, thin section petrology, detrital zircon U-Pb geochronology and Hf isotope data.

Chapter 3, entitled “Mesozoic development of nonmarine basins in the northern Yidun terrane: deposition and deformation in East Tibet prior to the India-Asia collision”, is co- authored by Delores M. Robinson, Amy L. Weislogel, Fei Shang, and Xing Jian. The manuscript focuses on the west Ganzi basin (WGB) and east Ganzi basin (EGB), located in the northern

Yidun terrane (Figure 1.2). This study presents structural and sedimentological field measurements, stratigraphic architecture of the basins, thin section petrology, and detrital zircon

U-Pb geochronology data.

Chapter 4, entitled “Early Cenozoic reactivation of the Triassic Ganzi-Litang suture recorded by detrital zircon geochronology: implications for strain partitioning in East Tibet during early stages of India-Asia collision”, is co-authored by Delores M. Robinson, Amy L.

Weislogel, Xing Jian, and Matthew P. McKay. The manuscript focuses on nonmarine strata

8 located in the Ganzi-Litang suture, which marks the eastern boundary of the Yidun terrane

(Figure 1.2). This study presents structural and sedimentological field measurements, detrital zircon U-Pb geochronology and Hf isotope data.

In Chapter 5, conclusions from each manuscript are summarized and placed into a regional context. The chapter also presents a discussion of the tectonic implications of this work pertaining to the development of the Tibetan Plateau. This dissertation uses the American

Geophysical Union’s formatting for the journal Tectonics.

9 References

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CHAPTER 2:

EARLY CENOZOIC DEVELOPMENT OF THE NONMARINE MULA BASIN, SOUTHERN YIDUN TERRANE: DEPOSITION AND DEFORMATION IN THE EASTERN TIBETAN PLATEAU RESULTING FROM THE INDIA-ASIA COLLISION

2.1. Abstract

In order to advance tectonic models of plateau outgrowth, parameters such as the timing, mechanism(s), and extent of Early Cenozoic deposition and deformation throughout the eastern

Tibetan Plateau in response to the India-Asia collision require definition. To better determine these parameters, we examine the nonmarine fill of the Mula basin, located in the southern

Yidun terrane, using field data, detrital zircon geochronology, Hf zircon isotopic values, and thin section petrology. The Mula basin is a NW-SE elongate exposure of ~ 1,050 m of nonmarine strata deposited in alluvial, fluvial, and lacustrine environments. The Mula basin is bound to the northeast by a thrust fault (327, 34°NE) that places Triassic Daocheng Pluton and Triassic Yidun

Group turbidite rock on top of nonmarine strata. The western Mula basin boundary is characterized by nonmarine strata unconformably overlying the Triassic Daocheng Pluton and

Triassic Yidun Group turbidite rock. A maximum depositional age of 45.51 ± 0.49 Ma documents an Eocene age for basin development. Provenance results indicate sediment influx mainly originated from localized drainage catchments, and lacked major, well-organized through-going drainage systems. We interpret that the Mula basin and other similar nonmarine successions in the Yidun terrane developed in a compressional deformational regime induced as

16 far-field upper-crustal response to the transition from an Andean style margin to continent collision margin as India impinged upon Eurasia.

2.2. Introduction

The present-day Tibetan Plateau developed as a result of the India-Asia collision, which initiated at ~ 55-60 Ma [Molnar and Tapponnier, 1975; Rowley, 1998; Dupont-Nivet et al.,

2010a,b; Najman et al., 2010; van Heinsburg et al., 2011; 2012; DeCelles et al., 2014; Orme et al., 2014; Carrapa et al., 2016]. Because the ongoing collisional processes occurring between

Indian and Asian lithosphere can be observed and measured, and because the plateau is the largest and highest on earth, researchers use the Tibetan Plateau to generate ideas regarding tectonic processes driving plateau development. Models aimed at describing the development of the Tibetan Plateau have invoked mechanisms such as underthrusting of the Indian lithosphere

[Powell, 1986; Zhao and Morgan, 1987; Owens and Zandt, 1997; DeCelles et al., 2002; Nabelek et al., 2009], rigid block translation [Tapponnier et al., 1982; 2001; Thatcher, 2007; Meade,

2007], distributed continuum deformation [England and McKenzie, 1982; England and

Houseman, 1986; 1989; England and Searle, 1986; Dayem et al., 2009] with associated convective removal of mantle lithosphere [Molnar et al., 1993], and middle to lower crustal flow

[Royden et al., 1997; Clark and Royden, 2000; Schoenbohm et al., 2006]. To test these models, spatial and temporal resolution of deformation associated with the India-Asia collision must be well understood. Therefore, stratigraphic ages, sedimentological descriptions, and structural relationships for Paleogene strata throughout the Tibetan Plateau are essential for accurately describing the progression, amount, and mechanism of deformation associated with the India-

Asia collision [i.e., Horton et al., 2002; 2004; DeCelles et al., 2007].

17 Late Cretaceous-Eocene nonmarine basins throughout the Tibetan Plateau contain a record of upper-crustal deformation and deposition (Figure 2.1) [Yin and Harrison, 2000]. These basins are elongate in shape, are oriented parallel to Mesozoic sutures, and are located in the footwalls of thrust faults [e.g., Studnicki-Gizbert et al., 2008]. While precise dating of these basins is difficult [Horton et al., 2004], nonmarine strata throughout the plateau have typically been assigned a Paleocene-Eocene age based on fossil assemblages, geochronology, and palynological data [B.G.M.R.S.P., 1991; Rowley, 1996; Liu et al., 2001; Spurlin et al., 2005;

DeCelles et al., 2007].

In contrast to other regions of the Tibetan Plateau, nonmarine basins located in the eastern Tibetan plateau remain understudied. The Yidun terrane, positioned between the

Qiangtang and Songpan-Ganzi terranes throughout the eastern Tibetan Plateau, hosts numerous nonmarine basins [B.G.M.R.S.P., 1991; Burchfiel and Chen, 2012]. The Yidun terrane is also located between the eastern Himalayan syntaxis and the Xianshuihe-Xiaojiang fault system, which marks the northern boundary of eastward clockwise rotation and extrusion of crustal blocks to the southeast [Wang and Burchfiel, 2000; Studnicki-Gizbert et al., 2008]. Thus, by studying Yidun terrane nonmarine basins, the style and timing of deformation and deposition throughout the eastern Tibetan Plateau can be determined.

The purpose of this study is to document sedimentological and structural data from the nonmarine Mula basin in the southern Yidun terrane (Figure 2.2) to determine the tectonic history of the basin and incorporate our findings into the understanding of the evolution of the

Tibetan Plateau. We present detrital U-Pb zircon geochronology and Hf isotope values, along with traditional provenance analyses and field measurements to address the tectonic setting, stratigraphic age, and sediment provenance of the Mula basin fill.

Figure 2.1. Distribution of Cenozoic nonmarine strata, faults, and suture zones throughout the Tibetan Plateau. Shaded area represents the study area (boundary for Figure 2a). Map adapted from Yin and Harrison [2000], Horton et al. [2002], and Spurlin et al. [2005]. Top left insert – outline of China with > 3.5 km topographic expression of the Tibetan Plateau (gray shading) and major suture zones delineated. Bottom left insert – summary of previous studies conducted on nonmarine strata throughout the Tibetan Plateau. ATF – Altyn Tagh fault; BNS – Bangong- Nujiang suture; JS – Jinsha suture; KFS – Kunlun fault system; LSTB – Longmen Shan thrust belt; RRF – Red River fault.

Figure 2.2. a) Regional map of the eastern Tibetan Plateau adapted from Burchfiel and Chen [2012] and Wang et al. [2013]. b) Geologic map of the Mula basin region with locations of detrital zircon and petrology samples.

20 2.3. Geologic Setting

The eastern Tibetan Plateau consists of a mosaic of terranes that includes the Lhasa,

Qiangtang, Yidun, and Songpan-Ganzi, separated by Paleo- and Meso-Tethys ocean sutures.

These terranes contain records of Paleozoic-Mesozoic rifting, migration, and amalgamation to the southern margin of Eurasia, while the intervening suture zones contain mélange and ophiolite rock that records the closure of ocean basins [Dewey et al., 1988; Yin and Harrison, 2000;

Burchfiel and Chen, 2012]. The Zhongza Massif, which now forms the western Yidun terrane, rifted from either the western margin of the Yangtze block [Zhang et al., 1998; Wang et al.,

1999] or the southern Kunlun terrane [Pullen et al., 2008; Ding et al., 2013] during Early

Triassic time. In the wake of the Zhongza Massif migration, an eastern branch of the Paleo-

Tethys Ocean was created, which contributed space for widespread deposition of the Songpan-

Ganzi and Yidun terrane turbidite complexes during Middle-Late Triassic time [Zhang et al.,

1998]. The Zhongza Massif collided with the Qiangtang terrane during Middle Triassic time, presently marked by the Jinsha Accretionary Complex [Reid et al., 2005a]. In Late Triassic time, subduction along the eastern Yidun terrane was initiated, marked presently by the Ganzi-Litang suture and Yidun Arc Late Triassic plutonic field [Hou et al., 1993; Hou, 1993; Peng et al.,

2014]. In Late Jurassic-Middle Cretaceous time, the Lhasa terrane collided with the southern margin of the Qiangtang terrane [Kapp et al., 2005]. In Late Cretaceous time northward subduction of the Neo-Tethys beneath the southern margin of the Lhasa terrane initiated, resulting in the development of the Gangdese magmatic belt [Van der Voo et al., 1999; Ding et al., 2005; Zhang et al., 2010]. While much still remains to be understood pertaining to these

Mesozoic collisional events, evidence suggests that they ultimately resulted in an Andean-like margin along southern Eurasia during Late Cretaceous-Paleogene time, forming a forearc,

21 continental magmatic arc, and retroarc foreland [Murphy et al., 1997; Kapp et al., 2003; 2007;

Guynn et al., 2006; DeCelles et al., 2007]; development of a concomitant plateau is also hypothesized [Wang et al., 2008; Zhang et al., 2012].

Following Mesozoic terrane collisions, the India plate rifted from Gondwana, migrated northward following the subducting Neo-Tethys Ocean, and collided with southern Eurasia in

Early Cenozoic time [Royden et al., 2008]. Paleogene deformation in response to this initial collision is marked by compressional structures and nonmarine deposition throughout the plateau

[Yin and Harrison, 2000]. In East Tibet, during Early Cenozoic time, southeastward extrusion of crustal blocks was initiated in response to continental collision [Tapponnier et al., 1982; 2001;

Burchfiel et al., 1995; Wang and Burchfiel, 1997]. Despite lack of post-Miocene upper-crustal shortening in East Tibet, high elevations (4-5 km) were generated by ~ 12-8 Ma as a result of middle to lower crustal flow [Royden et al., 1997; Clark et al., 2005; Schoenbohm et al., 2006].

2.4. Previous Work

Paleogene ages are assigned to all red colored, nonmarine stratigraphic successions throughout the Tibetan Plateau, based primarily on fossil ostracode and palynological assemblages [Rowley and Currie, 2006; references therein]. However, other nonmarine strata throughout the plateau range in age from Early Cretaceous to Miocene [Horton et al., 2002].

Difficulty in assigning ages for nonmarine strata in Tibet stems from the general lack of diagnostic fossils, datable volcanic layers and intrusions, regional lithostratigraphic correlations

[e.g., Horton et al., 2004] as well as structural overprinting, which is a result of multiple generations of deformation [Spurlin et al., 2005; Studnicki-Gizbert et al., 2008]. Results of work on these nonmarine strata are summarized below, with study area locations indexed in Figure

2.1.

22 2.4.1. Southern Tibetan Plateau

In the southern Lhasa terrane, the Late Cretaceous Takena Formation consists of nonmarine strata (Lhunzhub Member) developed in a retroarc foreland basin with sediment derived primarily from the Gangdese volcanic arc [Leier et al., 2007a]. The tectonic setting and development of the Takena Formation suggest that the southern margin of the Lhasa terrane was characterized by thickened crust and was likely at high elevations immediately prior to the India-

Asia collision [England and Searle, 1986; Leier et al., 2007a]. Detrital zircon geochronology results from the Takena Formation reveal age populations at 100-160 Ma, 500 Ma, 600 Ma, 1000

Ma, and 1400 Ma indicative of a typical Lhasa terrane signature [Leier et al., 2007b].

2.4.2. Central Tibetan Plateau

Kapp et al. [2005] document Middle Cretaceous nonmarine strata unconformably overlying Jurassic suture zone rock in the Qiangtang terrane anticlinorium. Paleogene deformation in the Qiangtang terrane is characterized by north-dipping thrust faults that cut

Eocene-Oligocene redbeds and volcanic rocks in the footwall. Two footwall volcanic tuff layers were dated by the Ar/Ar method at 64 and 43 Ma [Kapp et al., 2005]. Cretaceous deformation and denudation is attributed to northward underthrusting of the Lhasa terrane beneath the

Qiangtang terrane along the Bangong-Nujiang suture.

Kapp et al. [2007] and DeCelles et al. [2007] document nonmarine deposition and deformation in the Nima region, along the Bangong-Nujiang suture, which separates the Lhasa and Qiangtang terranes. Dating of a cross-cutting relationship between nonmarine strata and an intrusive rock establishes a 118 Ma age for the oldest nonmarine strata, bracketing the timing of final closure of the Bangong-Nujiang suture [Kapp et al., 2007]. Cretaceous-Paleogene sedimentation was coeval with thrust-faulting in the area, which resulted from northward low-

23 angle subduction of the Neo-Tethys oceanic lithosphere and Lhasa-Qiangtang terrane collision

[Kapp et al., 2007; DeCelles et al., 2007]. Oxygen-isotope analysis of carbonate nodules indicate regional paleoelevations of > 4.6 km during Late Oligocene time [DeCelles et al., 2007]. Rowley and Currie [2006] also document paleoelevations of >4 km in Eocene time for the Lunpola basin in the Lhasa terrane based on oxygen-isotopes.

2.4.3. North-Central Tibetan Plateau

The predominantly nonmarine Hoh Xil basin, located in the northern part of the

Qiangtang terrane contains three stratigraphic groups, the Fenghuoshan, Yaxicuo, and

Wudaoling Groups [Liu and Wang, 2001; Liu et al., 2001]. Based on fossil assemblages and magnetostratigraphy for the stratigraphically lowest Fenghuoshan Group, origin of this basin is assigned as Paleogene [Yin et al., 1988] and Cretaceous [Zhang and Zheng, 1994; Liu et al.,

2003] ages. The stratigraphic highest Wudaoling Group is Early Miocene (23-16 Ma) in age based on fossil assemblages [Zhang and Zheng, 1994]. Staich et al. [2014] establish an age of

Late Cretaceous-Eocene (85-51 Ma) for nonmarine strata based on detrital zircon geochronology. Dai et al. [2012] establish a detrital zircon maximum depositional age for the nonmarine strata of 121 Ma. Sedimentary provenance analysis from petrology and detrital zircon geochronology suggests that strata of the Hoh Xil basin were sourced locally from the Qiangtang terrane [Liu et al., 2001; Dai et al., 2012; Staisch et al., 2014].

2.4.4. East-Central Tibetan Plateau

Horton et al. [2002] document nonmarine sedimentation synchronous with Paleocene-

Eocene NE-SW shortening in the Nangqian-Niuguoda-Xialaxiu-Shanglaxiu basins, located in east-central Tibet’s Qiangtang terrane. Spurlin et al. [2005] expand on these basins in the Yushu-

Nangqian Region by establishing an Eocene age by dating intrusive rocks and quantify NE-SW

24 shortening to 61 km minimum. Spurlin et al. [2005] show that igneous intrusive rocks are subduction related, suggesting that crustal thickening during Eocene time resulted from continent subduction.

2.4.5. Eastern Tibetan Plateau

Studnicki-Gizbert et al. [2008] document Paleogene nonmarine deposition and associated compressional deformation in the Gonjo basin, resulting from the early stages of the India-Asia collision. Studnicki-Gizbert et al. [2008] illustrate a local provenance for Gonjo sedimentary rocks and document coaxial trends for Mesozoic and Cenozoic structures, illustrating the difficulty in distinguishing between the multiple phases of deformation. Tang et al. [2017] establish deposition of Gonjo basin strata prior to 43.2 Ma based on U-Pb dating of volcanics in the basin and indicate the basin attained elevations of 2100-2500 m in early Eocene time from oxygen and carbon stable isotope results.

2.4.6. Northeastern Tibetan Plateau

Horton et al. [2004] show nonmarine deposition and deformation in the Xining-Minhe and Dangchang basins. Basin deposition and deformation is characterized by Late Jurassic-Early

Cretaceous extension and Cretaceous-Paleogene post-rift thermal subsidence, followed by

Eocene (40-30 Ma) shortening related to the India-Asia collision.

2.5. Methods

2.5.1. Field Procedures

The nonmarine Mula basin was studied over three field seasons in 2013 and 2014. Rock samples were collected for detrital zircon geochronology and thin section petrology. Sampling distribution and density were controlled primarily by rock type and accessibility. Field data were

25 collected to document the sedimentological and structural relationships present. Detailed rock descriptions, field measurements, and sample locations are in Appendix I.

2.5.2. Detrital Zircon Geochronology

Six samples from Mula basin were analyzed for detrital zircon geochronology. One to four kilograms of sample were collected from sandstone and granule conglomerate. Distribution and number of samples were controlled primarily by accessibility to various parts of the basin and analytical costs. Zircon grains were separated using heavy mineral separation methods at the

University of Alabama. Unknown Mula zircon grains, along with standard Sri Lanka [Kroner et al., 1987; Gehrels et al., 2006] and R33 [Black et al., 2004] zircon fragments were mounted

(2.45 cm epoxy), abraded, polished, and imaged (back scatter electron) at the University of

Arizona LaserChron Center following procedures described in Gehrels et al. [2008] and Gehrels

[2014]. Ages were collected with a Nu Plasma multi-collector LA-ICP-MS (sample 13MB037c) and an Element 2 single collector LA-ICP-MS (samples 13MB043, 13MB044, 13MB035,

13MB054b, 13MB056a). Zircon grains were ablated with 25-30 µm diameter laser. Zircon data reduction (background, Hg, and fractionation corrections) were calculated in the excel software program Agecalc [Gehrels et al., 2008]. Isotopic age uncertainties were additionally evaluated based on the amount of 204Pb, concordance, and concentration of U and Th (ppm). Grains > 900

Ma (based on 206Pb/207Pb ages), were plotted in concordia space and evaluated based on 25% discordant or 5% reverse-discordant criteria. Grains < 900 Ma (based on 206Pb/238U ages), were plotted in concordia space for evaluation. Thus, the variability in number of zircon analyses per sample is a result of zircon yield, time and cost, and frequency of discordant analysis. Zircon data are presented using routines produced in Isoplot [Ludwig, 2003] and DensityPlotter

[Vermeesch, 2012]. Full U-Pb analytical data are in Appendix II.

26 As no diagnostic fossils, dateable volcanic ash layers, or cross-cutting intrusive bodies exist in the Mula basin, we utilize detrital zircon geochronology to understand the age of deposition by calculating maximum deposition ages (MDAs). Detrital zircon geochronology establishes the maximum age limit for stratigraphic successions based on the youngest analyzed zircon grain(s) [e.g., Fildani et al., 2003; Surpless et al., 2006; DeCelles et al., 2007b; Dickinson and Gehrels, 2009], especially for strata that otherwise do not yield any information pertaining to their age [e.g., Barbeau et al., 2009; Dickinson and Gehrels, 2009]. However, many geologic factors (i.e., lull in deposition, isolation of source material, field/lab contamination) can cause the youngest zircon age(s) to be 10’s to 100’s of million years older than the true depositional age of the strata [Sircombe, 1999; Nelson, 2001]. In addition, only using the youngest detrital zircon grain to determine the maximum depositional age, may produce an age younger than the true depositional age [Dickinson and Gehrels, 2003; 2009; Dehler et al., 2010]. Thus, a much more reliable approach is to calculate the weighted mean average of the youngest zircon population that contains a n value of ≥ 3 [Vermeesch, 2004; Dickinson and Gehrels, 2009].

2.5.3. Detrital Zircon Hf Isotopes

Sixty-two detrital zircon grains were analyzed for Hf-isotopic values by LA-ICP-MS at the University of Arizona LaserChron Center following methods described by Gehrels and

Pecha [2014]. Data were collected using a Nu Plasma HR ICP-MS, coupled to a New Wave 193 nm ArF laser ablation system from existing pits from previously analyzed detrital U-Pb zircon grains to best ensure that the initial Hf isotope data were determined from the same domain as the U-Pb age. An average of 10 analyses were collected from each sample, with the goal to represent each of the prominent age populations identified from U-Pb geochronology analyses.

Full Hf data are in Appendix III.

27 2.5.4. Petrology

Fifteen thin-sections from Mula basin samples were prepared for petrographic analysis.

Mineral staining was included for assistance in potassium feldspar and calcic plagioclase identification. Minerals documented include monocrystalline quartz, polycrystalline quartz, plagioclase feldspar, potassium feldspar, volcanic/meta-volcanic lithic fragments, sedimentary/meta-sedimentary lithic fragments, and matrix. Four-hundred framework grains were counted for each sample following the Ganzi-Dickinson method to minimize grain-size effects [Dickinson, 1970; Ingersoll et al., 1984]. Results were plotted in the following ternary spaces: (1) Quartz total, Feldspar, Lithics (QtFL), (2) Monocrystalline quartz, Feldspar, Lithic total (QmFLt), (3) Monocrystalline quartz, Plagioclase, Potassium feldspar (QmPK), and (4)

Polycrystalline quartz, volcanic lithics, sedimentary lithics (QpLvLs) to asses associated tectonic settings [Dickinson, 1985], using an excel-based method by Zahid and Barbeau [2011]. Full petrographic data are in Appendix IV.

2.6. Results

2.6.1. Mula Basin Stratigraphy

The Mula basin contains ~ 1,050 m of oxidized, red to purple nonmarine strata in three distinctive units (Figure 2.3). The stratigraphic lowest is unit 1, which consists of an ~ 5-20 m thick basal conglomerate overlain by ~ 200-250 m of interbedded conglomerate, sandstone, and mudstone. Unit 1 basal conglomerate clasts are pebble to cobble in size, predominantly matrix- supported, with < 0.5 m thick clast-supported intrabeds, unconformably overlying the Triassic

Yidun Group and Triassic Daocheng Pluton. Clasts are subangular to subrounded and consist of shale, granite, quartz, sandstone, and chert (Figure 2.4a). Bedding is tabular with no evidence of channel bases. Clast imbrication (n=44) in clast-supported conglomerate intrabeds indicate

28 paleoflow directions to the southwest, west, and northwest. Above the basal conglomerate is an interbedded sequence of conglomerate, sandstone, and mudstone (Figure 2.4b, 2.4c, 2.4d).

Conglomerate beds are ~ 0.5-3 m thick, clast-supported, with subrounded granule-sized clasts.

Sandstone beds are ~ 0.5-3 m thick, fine- to medium-grained, subrounded, predominately feldspathic arenites, although lithic arenites are present. Overall, unit 1 fines upward.

Stratigraphically above unit 1, unit 2 consists of an ~ 500-600 m thick sequence of interbedded sandstone and mudstone, with occasional conglomerate beds (Figure 2.4e).

Sandstone beds are ~ 0.5-3 m thick, fine- to medium grained, subrounded, predominately feldspathic arenites, although lithic arenites are present. Mudstone beds throughout unit 2 are massive and range drastically in thickness. Overall, unit 2 fines upward.

Stratigraphically above unit 2, unit 3 consists of a 200-300 m thick sequence of mudstone and shale, with thin (< 2 m) sandstone and siltstone beds. Mudstone beds throughout unit 3 are massive with highly variable bedding thickness. Sandstone and siltstone intrabeds are well- sorted, subrounded to rounded, feldspathic arenites and lithic arenites. Unit 3 does not show a stratigraphic textural pattern.

2.6.2. Detrital Zircon Geochronology

Detrital zircon ages (n=1502) were collected from six Mula basin samples (Figure 2.2 and 2.3). Cumulative results illustrate one primary age population at 200-250 Ma, along with minor populations at 40-60 Ma, 250-450 Ma, 700-850 Ma, ~ 1,800 Ma, and ~ 2,500 Ma (Figure

2.5). The 200-250 Ma population dominates the Mula basin data set at 45.3% occurrence. The second largest population is the ~ 1,800 Ma peak, consisting of 14.9% of total analyzed zircon grains. The youngest population is 40-50 Ma and is 4.1% of the population.

29 Sample 13MB037c is the stratigraphic highest sample and yields 90 ages with evidence of all major age populations present in the cumulative data set, with peaks at 40-50 Ma, 200-250

Ma, 250-350 Ma, 400-500 Ma, ~ 1,200 Ma, ~ 1,800 Ma, ~ 2,200 Ma, and ~ 2,500 Ma (Figure

2.5a). Eight zircon grains from 13MB037c have ages between 40-50 Ma, with the youngest grain at ~ 42 Ma. 13MB044 is located stratigraphically below sample 13MB037c and yields 313 ages with evident age populations at 40-50 Ma, 200-250 Ma, 250-350 Ma, ~ 400 Ma, ~ 1,800 Ma, and

~ 2,500 Ma (Figure 2.5b). Thirty-six zircon grains from 13MB044 have ages between 40-50 Ma, with the youngest grain at ~ 43 Ma. 13MB054b is located stratigraphically below sample

13MB044 and yields 312 ages with evident age populations at 40-50 Ma, 200-250 Ma, 300-400

Ma, ~ 800 Ma, ~ 1,800 Ma, and ~ 2,500 Ma (Figure 2.5c). Ten zircon grains from 13MB054b have ages between 40-50 Ma, with the youngest grain at ~ 44 Ma. 13MB043 is located stratigraphically below sample 13MB054b and yields 207 ages with evident age populations at

200-250, ~ 300-400 Ma, ~ 800 Ma, ~ 1,800 Ma, and ~ 2,500 Ma (Figure 2.5d). Two zircon grains from 13MB043 have ages between 40-50 Ma, with the youngest grain at ~ 44 Ma.

13MB035 is located stratigraphically below sample 13MB043 and yields 292 ages with one evident population at 200-250 Ma (Figure 2.5e). Two zircon grains from 13MB035 have ages between 40-50 Ma, with the youngest grain at ~ 42 Ma. 13MB056a is the stratigraphic lowest sample and yields 288 ages with only one evident population at 250-200 Ma (Figure 2.5f). Three zircon grains from sample 13MB056a have ages between 40-50 Ma, with the youngest grain at ~

44 Ma.

2.6.3. Detrital Zircon Hf Analysis

Hf isotope analytical results (Figure 2.6) show a significant portion of analyzed zircons have negative Hf values (41 of 62 grains; 66%). Eocene-aged grains range from Hf values of +4

30 to -4. Triassic-aged grains show Hf values clustered between -5 to -9. Devonian-Cambrian grains range widely from Hf +8 to -27. Neoproterozoic age grains illustrate Hf values from +7 to -2.

Paleoproterozoic age grains cluster between Hf 2 to -4. Paleoproterozoic-Archean age grains range in Hf values of +5 to -5.

2.6.4. Petrology

Framework-grain modal composition in 13 of 15 samples plot in the recycled orogenic field for the QtFL provenance discrimination ternary diagram, while 2 of 15 plot in the dissected arc field (Figure 2.7a). The 15 samples plot in the transitional recycled, recycled orogenic, mixed fields for the QmFLt ternary diagram (Figure 2.7b). All 15 samples plot in the recycled orogeny field for the QmPK ternary diagram (Figure 2.7c). Of 15 samples, 13 plot in the collision suture and fold-thrust belt source field for the QpLvLs ternary diagram (Figure 2.7d).

2.6.5. Structure

The Mula basin is elongate to the NNW–SSE with beds oriented ~ 330° with dips 24-

38°E. To the southwest, the Mula basin is bound by unconformable contacts with the Triassic

Daocheng Pluton and Triassic Yidun Group turbidite rock. To the northeast, the Mula basin is bound by a reverse fault oriented ~ 327, 34°NE that places Triassic Yidun Group turbidite rock on top of nonmarine basin strata (Figure 2.8). Another reverse fault mapped in the southern part of the basin is oriented parallel to the basin-bounding fault, places unit 2 strata in the hanging- wall on top of unit 3 strata in the footwall (Figure 2.8). The intra basin fault decreases in offset towards the northwest, where it presumably pinches out or is overridden by the basin-bounding fault. No growth strata are present in the Mula basin.

Figure 2.3. Stratigraphic column for the Mula basin illustrating rock type, location of detrital zircon and thin section petrology samples, and measured paleoflow directions.

Figure 2.4. Field photographs from the Mula basin illustrating examples of units 1-3 stratigraphic intervals. a) unit 1 matrix-supported conglomerate with various locally derived clasts. b) unit 1 interbedded conglomerate and mudstone/siltstone. c) unit 1 interbedd conglomerate, sandstone, and mudstone. d) unit 2 interbedded sandstone, mudstone, and conglomerate. e) unit 2 interbedded sandstone and mudstone. f) unit 3 interbedded shale and siltstone.

Figure 2.5. Detrital zircon geochronology results for the Mula Basin. Each sample has been area corrected for plot. Black line represents a kernel density estimation calculated with a 15 bin size. Grey boxes represent 50 Ma histogram distribution of sample ages. Inserts represent 0-250 Ma for each corresponding sample.

Figure 2.6. Hf data plotted with respect to U-Pb ages and epsilon Hf values. Arrow illustrates path of Hf isotopic evolution of a typical felsic crust. Reference lines on the Hf plot are as follows: DM—depleted mantle; CHUR—chondritic uniform reservoir. Gray arrows show interpreted crustal evolution trajectories assuming present-day 176Lu/177Hf.

Figure 2.7. Petrographic results from nine WGB and EGB samples. A) Qt-F-L plot. Cl – craton interior, TC – transitional continental, BU – basement uplift, RO – recycled orogenic, DA – dissected arc, TA – transitional arc, UA – undissected arc. B) Qm-F-Lt plot. Cl – craton interior, TC – transitional continental, BU – basement uplift, RO – recycled orogenic, M – mixed, DA – dissected arc, TA – transitional arc, TR – transitional recycled, LR – lithic recycled, UA – undissected arc. C) Qm-P-K plot. CBP – continental block provenance, MAP – magmatic arc provenance, ROP – recycled orogen provenance. D) Qp-Lv-Ls plot. SCS – subduction complex sources, AOS – arc orogen source, CS-FTBS – collision suture & fold-thrust belt sources.

Figure 2.8. Cross sections A-Aʹ, B-Bʹ, and C-Cʹ from the Mula basin. Cross section line locations shown in Figure 2.2. Two times vertical exaggeration.

37 2.7. Interpretations

2.7.1. Depositional Environments

Conglomerate clast compositions are similar to local bedrock indicating a local source; are matrix-supported with various clast sizes and shapes; and have sheet bedding. Therefore, we interpret the depositional environment for unit 1 to be alluvial fan. The intrabedded clast- supported layers may represent traction deposits associated with episodes of alluvial fluid-flow

[Gomez, 1991]. The depositional environment for units 2 and 3 is interpreted to be a stream-flow alluvial fan. Planar cross-lamination in the sandstone intrabeds indicate current transport, and mudstone interbeds reflect either muddy debris-flows or pedogenic alteration of fine-grained stream-flow alluvial deposits. Overall, depositional environments suggest decreasing slope of the alluvial environment over time, either due to erosional degragation or due to subsidence along the basin margin driving alluvial fan retrogradation and migration toward the hinterland.

2.7.2. Age of Strata

Weighted mean averages for the youngest detrital zircon population from each sample yields Eocene ages from ~ 43-47 Ma (Figure 2.9). When all Eocene grains are combined into a composite, the weighted mean average is 45.51±0.49 Ma (Figure 2.9g), establishing a maximum depositional age for Mula basin strata. The overlap in ages from samples taken in the lower and upper parts of the stratigraphy suggests that sediment was deposited in a relatively short period of time and that basin sediment was uniformly sourced from a similar area throughout deposition.

2.7.3. Sedimentary Provenance

Field clast counts and thin section petrology suggest that Mula basin strata was sourced locally from the Triassic Daocheng Pluton and Triassic Yidun Group turbidites. To identify the

38 influence of these and other potential source rocks on the finer-grained basin fill, we compare the detrital zircon results to published zircon data sets for both the Daocheng Pluton and Yidun

Group turbidites (Figure 2.10). Compatibility is shown between Late Triassic zircon ages from the Daocheng Pluton and Triassic (215-225 Ma) detrital zircons from the Mula basin (Figure

2.10a). All other detrital age populations older than Late Triassic in the Mula strata are present in southern Yidun terrane turbidite detrital signatures (Figure 2.10b). Thus, between the two sources, all detrital zircon age populations in the Mula basin signature are accounted for except the Eocene population. We interpret these results to illustrate a local provenance for Mula basin strata.

Determining the source for Eocene age grains remains problematic. The emplacement of

Eocene-Oligocene magmatic bodies appears to have accompanied the development of sedimentary basins throughout other parts of the plateau, predominantly in close proximity to the

Jinsha-Jiang and Bangong-Nujiang sutures [Chung et al., 2005; Wang et al., 2008; Wang et al.,

2008]. Similar basin-pluton relationships have also been identified southeastward to regions around the Red River Shear Zone [LeLoup et al., 1995; Chung et al., 1998; Wang et al., 2001].

Thus, the likely source should be one of the Cenozoic plutonic bodies throughout the eastern

Tibetan plateau [e.g., Roger et al., 2000]. The nearest Cenozoic pluton is ~ 75 km to the west from the Mula basin. This distance questions how “local” the sediment source was during deposition and our measured paleoflow directions. The nearest Eocene pluton east of the Mula basin is presently located ~ 225 km to the northeast. However, numerous Eocene plutons are present southeastward of the Mula basin between the eastern Himalaya syntaxis and the Ailao

Shan shear zone [Wang and Burchfiel, 1997], which upon paleo-restoration would presumably

39 have been more proximal to the basin during deposition. Other possible explanations for Eocene grains could include air transported grains or complete erosion of the source Eocene pluton.

The lack of Cretaceous age grains in our detrital zircon data is interesting because of the proximity of Cretaceous Chuer Shan and Haizi plutons [Reid et al., 2007] to the Mula basin

(Figure 2.5). The absence of Cretaceous age grains requires that either the plutons were not exposed prior to the development of the Mula basin, there was little extrusive magmatism associated with emplacement of these plutons or the extrusive equivalents were removed by erosion prior to Eocene time, or that there was a negligible sediment contribution from the area that Cretaceous plutons currently occupy. Because both Cretaceous plutons are located to the west and northwest of the Mula basin and paleoflow measurements illustrate westward directed sediment transport, we interpret the lack to Cretaceous age grains to be a consequence of geographic position at the time of Mula basin development.

Eocene and Triassic age Hf results from the Mula basin suggest they evolved from

Paleozoic and Neoproterozoic crust. Hf data from Yidun Group turbidites (Figure 2.6) reveal magmatic reworking at ~ 2000 Ma and ~ 2500 Ma, with the addition of juvenile material at 800-

980 Ma, coinciding with episodic magmatism and crustal growth of the South China block

(Yangtze) [Wang et al., 2013; Sun et al., 2009; Wang et al., 2010; Wang and Zhou, 2012]. This correlation, along with an interpretation that the Zhongza Massif is of Yangtze block affinity

[Chang, 2000; Song et al., 2004; Wang et al., 2013], would imply that Mula basin strata are primarily derived from recycling of the Yidun Group, which in turn was sourced from erosion of the Zhongza Massif.

Figure 2.9. Weighted mean average plots illustrating maximum depositional ages for samples 13MB037c (A), 13MB044 (B), 13MB054b (C), 13MB043 (D), 13MB035 (E), 13MB056a (F), and a composite of all samples combined (G). Error bars represent 2σ error.

Figure 2.10. Regional detrital zircon geochronology kernel density curves for provenance source evaluation of Mula basin nonmarine strata.

42 2.7.4. Tectonic Setting

The parallel trend relationship of the Mula basin to the Triassic Ganzi-Litang suture precludes a tectonic setting associated with strike-slip deformation (i.e., restraining bend). We interpret the compressional deformation associated with the Mula basin to suggest that the

Ganzi-Litang suture was reactivated in the region during Eocene time, prior to the onset of strike-slip deformation throughout east Tibet. Thus, the Mula basin developed in a thin-skinned fold-thrust belt. Our results suggest offset along the bounding faults, similar to other nonmarine basin shortening estimates of ~ 5-10 km [Horton et al., 2002; Spurlin et al., 2005; Studnicki-

Gizbert et al., 2008], however, the amount of regional shortening remains unclear.

Detrital zircon geochronology results show that an increase in occurrence of

Paleoproterozoic and Eocene zircons upsection in Mula basin stratigraphy. In contrast, samples collected at lower stratigraphic positions are overwhelmed by Triassic (Daocheng Pluton) zircon ages. These data can be interpreted to illustrate the evolution of fault movement and rock exhumation in the area at the time of deposition. The lower detrital samples (13MB056a,

13MB035) sampled from stratigraphic unit 1, suggest local erosion primarily of the Triassic

Daocheng Pluton. The presence of Paleoproterozoic zircons and Eocene zircons in samples

(13MB043, 13MB054b, 13MB044, 13MB037c) collected in units 2 and 3 suggest that fault movement and erosion incorporated a greater amount of Triassic Yidun Group turbidite rock.

While Eocene zircon grains are present in all 6 samples, occurrence increases upsection.

2.8. Discussion

2.8.1. Sediment Provenance, Stratigraphic Age, and Regional Correlation

The overwhelming amount of Late Triassic zircon grains suggest that the primary source for Mula sediment was the Daocheng Pluton, with older populations correlating to populations

43 present in Triassic Yidun Group turbidites. A local sediment catchment area correlates well with other studies of Paleogene nonmarine strata throughout the plateau [i.e., Horton et al., 2002;

Spurlin et al., 2005; Studnicki-Gizbert et al., 2008], which show that during the Eocene, in and north of the Qiangtang terrane, deposition was predominantly nonmarine and constricted to relatively small local drainage catchments. The youngest detrital zircon population establishes a maximum depositional age of Eocene for the Mula basin. Thus, age determinations indicate the

Mula basin developed contemporaneously with other nonmarine basins associated with Eocene deformation along the Jinsha-Jiang and Bangong-Nujiang sutures.

2.8.2. Tectonic Model

Results allow us to propose a tectonic model for the southern Yidun terrane during

Eocene time. During the initial stages of India-Asia collision, strain was accommodated in the southern Yidun terrane by compressional deformation, which preferentially developed because of reactivation of faults within the Triassic Ganzi-Litang suture zone. As crustal material comprised of Triassic Daocheng Pluton and Triassic Yidun Group turbidites was exhumed, erosion supplied sediment that was transported southwestward and deposited. The limited thickness of basin fill (~ 1 km) may be attributed to limited subsidence of the footwall because of local block tilting, similar to piggy back basins in thin-skinned fold-thrust belts [e.g., Ori and

Friend, 1986; Talling et al., 1995]. This model fits well with region thermochronology results that show rapid cooling during Late Triassic-Early Jurassic, followed by a period of tectonic calm until Eocene time when another phase of cooling is recorded [Kirby et al., 2002; Roger et al., 2004; 2010; Reid et al., 2005b].

2.8.3. Broader Implications

44 East Tibet evolved tectonically in Cenozoic time as a region of accommodation space, where crustal material between the eastern Himalayan syntaxis and the South China block experienced deformation by shortening, strike-slip faulting, and crustal block rotation. However, details pertaining to the spatial relationships and timing of the shortening and strike-slip faulting remain unclear. Our results help to understand when deformation in the region switched from compression to strike-slip. In the southern Yidun terrane compressive deformation persisted as the dominant deformational regime until at least the development of the Mula basin. Initiation of strike-slip deformation most likely developed soon after in Eocene time, resulting in southeastward extrusion of the Yidun terrane. This early Cenozoic shortening characteristics has been suggested to result from the initial underthrusting of the Indian lithosphere beneath Tibet

[e.g., DeCelles et al., 2002]. Paleoelevation estimates show that the southern and central part of

Tibet at this time had already accumulated elevations similar to those today, however, the northern part of the plateau remained at relatively low elevations.

2.9. Conclusions

The Mula basin in the southern Yidun terrane contains a record of deposition and deformation associated with far-field effects of the Cenozoic India-Asia collision. This study yields the following conclusions:

1. The Mula basin consists of ~ 1,050 m of nonmarine strata deposited in alluvial

depositional environments.

2. A maximum depositional age of ~ 45 Ma, calculated from the youngest detrital zircon

population, demonstrates an Eocene age for the Mula basin.

45 3. The Mula basin is elongate in an NNW-SSE direction and bound to the east by a thrust

fault, subparallel to the Ganzi-Litang suture, located ~ 30 km to the east, which precludes

basin development resulting from strike-slip deformation.

4. Field observations, thin section petrology, detrital zircon geochronology, and Hf isotope

results show that Mula basin sediment was sourced locally from the Late Triassic

Daocheng Pluton and Triassic Yidun Group turbidites.

5. The development of the Mula basin suggests deposition and deformation was associated

with thrust reactivation of faults within the Late Triassic Ganzi-Litang suture zone,

delineating plateau outgrowth during Eocene time.

Acknowledgments

This work was supported by U.S. National Science Foundation grants EAR-1119266

(Robinson) and EAR-1119219 (Weislogel). The University of Alabama Graduate School and

Department of Geological Sciences provided travel support. The authors wish to thank

Chunmiao Zheng (Peking University) for assistance with field permits. Detrital zircon analyses were conducted at the University of Arizona’s LaserChron Center

(https://sites.google.com/a/laserchron.org/laserchron/). Fei Shang (Chinese Petroleum Company) assisted in the field and provided many constructive discussions pertaining to the tectonic development of east Tibet.

46 References

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CHAPTER 3:

MESOZOIC DEVELOPMENT OF NONMARINE BASINS IN THE NORTHERN YIDUN TERRANE: DEPOSITION AND DEFORMATION IN THE EASTERN TIBETAN PLATEAU PRIOR TO THE INDIA-ASIA COLLISION

3.1. Abstract

We present field data, thin section petrology, and detrital U-Pb zircon geochronology from the west Ganzi basin (WGB) and east Ganzi basin (EGB), northern Yidun terrane, in order to reconstruct timing and spatial patterns of syntectonic deformation and deposition in the eastern Tibetan Plateau. The WGB and EGB contain ~ 800 m and ~ 1600-1830 m of nonmarine strata, respectively, deposited in an alluvial and fluvial environments. Boundaries for the WGB and EGB are characterized by unconformities and reverse faults with the underlying Triassic

Yidun Group turbidite rock and the Triassic Ganzi Pluton. Growth strata present in the footwalls of basin-bounding faults indicate deposition was synchronous with fault development. Maximum deposition ages from detrital zircon geochronology are consistent with previously reported palynology that indicate a latest Mesozoic age for WGB and EGB development. We interpret the spatial and temporal development of the WGB and EGB nonmarine strata to record the exhumation of the Triassic Yidun Group and Triassic Ganzi Pluton rock during a regional compressional deformation event, a direct consequence of Mesozoic terrane accretions to the southern margin of Eurasia.

3.2. Introduction

Late Mesozoic spatial and temporal patterns of deformation and deposition throughout the Tibetan Plateau control the lithospheric architecture that was later modified by development

56 of the Cenozoic Himalaya-Tibetan orogenic system [Dewey et al., 1988; Metcalf, 1996; Yin and

Harrison, 2000; Horton et al., 2002; Burchfiel and Chen, 2012]. In the eastern Tibetan Plateau, widespread Triassic deformation is associated with the closure of the Paleo-Tethys Ocean

[Harrowfield and Wilson, 2005; Reid et al., 2005a; Roger et al., 2004; 2010; Weislogel, 2008;

Pullen et al., 2008]. This Triassic collisional phase is recorded by turbidite deposition and deformation in the Songpan-Ganzi and Yidun terranes, as well as pluton development associated with subduction along the Ganzi-Litang suture [Zhou and Graham, 1996; Reid et al., 2005;

2007; Weislogel, 2008; Roger et al., 2010; Wang et al., 2013a]. After latest Triassic deformation of these rocks, deformation phases are recorded from the collision between the Lhasa and

Qiangtang terranes during Middle Cretaceous time and oceanic India-plate subduction in Late

Cretaceous-Early Cenozoic time, resulting in development of an Andean-type margin along southern Eurasia [Murphy et al., 1997; Kapp et al., 2003; 2007; Guynn et al., 2006; DeCelles et al., 2007]. Finally, in Early Cenozoic time, the Indian subcontinent collided with Asia along the

Yarlong-Zangbo suture, with convergence continuing to the present [Molnar and Tapponnier,

1976; Rowley, 1998; Dupont-Nivet et al., 2010; Najman et al., 2010; van Heinsburg et al., 2011;

2012; DeCelles et al., 2014; Carrapa et al., 2016]. Despite well-documented evidence for the aforementioned tectonic development, it remains unclear how Mesozoic tectonism influenced the lithosphere structure that was later modified by Cenozoic tectonics in the eastern Tibetan Plateau

[Burchfiel and Chen, 2012]. Development of a “proto” Tibetan Plateau along the southern margin of Eurasia has been indicated by Paleogene sedimentary records [e.g., Kapp et al., 2007;

DeCelles et al., 2007]; however, the age of the earliest plateau development has not been established.

Figure 3.1. a) Regional tectonic map for the eastern portion of the Tibetan Plateau. Insert illustrates the location of Figure 1a relative to China. Major suture zones are delineated on map of China. GLS – Ganzi-Litang suture, JAC – Jinsha Accretionary Complex, JS – Jinsha suture, BNS – Bangong-Nijang suture, IYS – Indus-Yarlong suture. A-Aʹ line represents measured length across the Songpan-Ganzi terrane. b) Generalized geologic map for the Yidun terrane and surrounding region, with location of the West Ganzi Basin (WGB) and East Ganzi Basin (EGB). Colored circles indicate location of previously published detrital zircon geochronology. Colored stars indicate location of previously published geochronology of plutonic bodies. Base map adapted from Burchfiel and Chen [2012] and Wang et al. [2013].

58 To determine the Mesozoic development of the eastern Tibetan Plateau, stratigraphic chronologies from Mesozoic sedimentary basins throughout the plateau are required [Yin and

Harrison, 2000; Horton et al., 2002]. Post-Triassic strata in the interior of the Tibetan Plateau are primarily composed of oxidized nonmarine sedimentary rock, which in most cases lack diagnostic fossils, datable volcanic layers/intrusions, and regional lithostratigraphic correlations

[Kidd et al., 1988; Yin et al., 1988; Wang et al., 2001]. Along with these complications, the multiple episodes of deformation exacerbate the difficulty in assigning ages to these sedimentary strata [e.g., Spurlin et al., 2005; Studnicki-Gizbert et al., 2008; Craddock et al., 2012]. Located in the eastern Tibetan Plateau, the Yidun terrane hosts nonmarine basins previously assigned

Eocene ages during regional surveying [BGMRSP, 1991; Jackson et al., this volume]. However, palynology results suggest that nonmarine basins in the northern Yidun terrane may exhibit

Cretaceous ages.

The purpose of this study is to document sedimentological and structural data from two nonmarine basins in the northern part of the Yidun terrane, the west Ganzi basin (WGB) and east

Ganzi basin (EGB). We present detrital zircon geochronology, thin-section petrographic analyses, and field data to address the tectonic setting, stratigraphic age, and sedimentary provenance of each basin. Results contribute towards a comprehensive assessment of nonmarine deposition and deformation throughout the eastern Tibetan Plateau in Mesozoic and Cenozoic time.

3.3. Geologic Setting

3.3.1. Yidun Terrane

The Yidun terrane is positioned between the Qiangtang terrane to the west and the

Songpan-Ganzi terrane to the east and north, and is bounded by two Paleo-Tethys suture zones

59 (Figure 3.1). The Jinsha Accretionary Complex, also referred to as the Jinsha-Jiang suture, separates the Qiangtang terrane to the southwest from the Yidun terrane. The Jinsha

Accretionary Complex developed during Early-Middle Triassic time in response to Zhongza

Massif and Qiangtang collision [Wang et al., 2000; Zhang, 2000; Reid et al., 2005a]. The Ganzi-

Litang suture separates the Songpan-Ganzi terrane from the Yidun terrane. The Ganzi-Litang suture developed during Late Triassic time in response to westward subduction of crust beneath the eastern Yidun terrane [Reid et al., 2007; Weislogel, 2008].

The Yidun terrane is separated into eastern and western regions. The western region, referred to as the Zhongza Massif, is characterized by a meta-sedimentary Paleozoic passive margin sequence [Chen et al., 1987]. The eastern Yidun terrane is characterized by the Late

Triassic Yidun Arc [Reid et al., 2007; Weislogel, 2008] and Triassic Yidun Group turbidite rock

[Wang et al., 2013a; 2013b; 2013c]. The Late Triassic Yidun Arc is a north-south trending, rhyolitic/calc-alkaline plutonic field along the eastern margin of the Yidun terrane, with ages ranging from ~ 225-215 Ma [He et al., 2013; Peng et al., 2014]. Emplacement of the Yidun Arc is thought to record subduction along the eastern Yidun terrane that produced the Ganzi-Litang suture in Late Triassic time [Chen et al., 1987; Hou et al., 2004; Wang et al., 2011]. The Triassic

Yidun Group is a ~ 5-12 km thick turbidite and volcanic sedimentary sequence [BGMRSP, 1991;

Hou, 1993; Wang et al., 2013b]. Detrital zircon studies on Triassic Yidun Group turbidites show the presence of age peaks at 220-240 Ma, 400-480 Ma, 720-880 Ma, 880-980 Ma, 1,790-1,900

Ma, and 2,450-2,500 Ma [Wang et al., 2013b; Ding et al., 2013; Jian et al., 2015]. Wang et al.

[2013b] illustrate that turbidites from the northern and southern Yidun terrane exhibit different signatures for time equivalent strata, resulting from two different depo-systems. Turbidites in the northern Yidun terrane contain only two prominent age peaks, 400-480 Ma and 880-980 Ma,

60 with a third minor age peak at 2,450-2,500 Ma. Turbidites in the southern Yidun terrane contain the three age peaks present in northern Yidun turbidites, along with peaks at 220-240 Ma, 720-

880 Ma, and 1,750-1,900 Ma. For the northern and southern Yidun Group, a Zhongza Massif provenance is inferred, with the southern Yidun Group also receiving material from the Triassic

Yidun Arc represented by the 200-250 Ma zircon population [Wang et al., 2013b; Ding et al.,

2013].

3.3.2. Songpan-Ganzi Terrane

The Songpan-Ganzi terrane consists predominantly of an ~ 10-15 km thick Middle to

Late Triassic turbidite sequence, covering an area of > 200,000 km2 [Huang and Chen, 1987; Nei et al., 1994; Zhou and Graham, 1996]. Turbidities from the Songpan-Ganzi terrane are lithologically similar to Yidun Group turbidites in hand specimen and thin section. Detrital zircon results show that eastern Songpan-Ganzi turbidite strata formed in three distinct depocenters, sourced from various North China, Qinling-Dabie, South China, and

Yidun/Qiangtang sources [Weislogel et al., 2006; 2010; Enkelman et al., 2007]. Further detrital zircon and Hf isotopic work on the Songpan-Ganzi turbidites suggest that the southeastern depocenter of the Songpan-Ganzi terrane turbidites and Yidun Group turbidites were connected as a large regional depocenter during Late Triassic time [Weislogel et al., 2010; Ding et al.,

2013; Jian et al., 2014; 2015].

3.4. Methods

3.4.1. Field Procedures

This study targeted nonmarine strata of the WGB and EGB. The WGB and EGB are remote, each with one road as access. Most rocks crop out near the top of ridges ~ 300-500 m above the base elevation of ~ 3,800 m. Sampling distribution and density were controlled

61 primarily by rock type (medium-grain sandstone and granule-conglomerate) and accessibility of rocks. Fractures were measured, along with abutting relationships to assess deformation type and generations. Nine conglomerate clast counts were collected to augment petrographic and detrital zircon geochronology provenance analyses. The rock type of 50-100 clasts were counted for each clast count using a 2 cm spacing over an ~ 1 m grid. Rock descriptions, field measurements, and sample locations are in Appendix I.

3.4.2. Detrital Zircon Geochronology

Seven samples were analyzed for detrital zircon geochronology, four samples from WGB and three samples from EGB. One to four kg samples of medium-grained sandstone to granule- conglomerate were collected. Zircons were separated, mounted, and imaged at the University of

Alabama and University of Arizona following procedures outlined by Gehrels et al. [2006;

2008]. Ages were collected with a Nu Plasma multi-collector LA-ICP-MS (samples 13AWJ1,

13FS4244, 13WJ002, 14EG06b, and 14EG27) and an Element2 single collector LA-ICP-MS

(samples 14WG15 and 14EG05) at the Arizona LaserChron Lab. The acquisition routine on the multi-collector followed that of Johnston et al. [2008], while the routine for the single collector followed steps outlined in Pullen et al. [2014]. For a detailed description of the methodology, equipment, and performance of the LA-ICP-MS refer to the University of Arizona’s Laserchron

Lab website (https://sites.google.com/a/laserchron.org/laserchron/). Zircon data reduction was processed using AgeCalc at the University of Arizona [Gehrels et al., 2008]. Following the data reduction zircon ages were evaluated in two ways. For grains > 900 Ma, ages were plotted on a

Concordia diagram and evaluated based on 25% discordant or 5% reverse-discordant criteria.

For grains < 900 Ma, ages were plotted on a Concordia diagram for evaluation and processed through a combined 98% filter consisting of three variables, uranium abundance (ppm), thorium

62 abundance (ppm), and initial lead concentration. Results were analyzed and plotted using Isoplot

3.0 [Ludwig, 2012] and DensityPlotter [Vermeesch, 2012]. Geochronology analytical data are in

Appendix II.

3.4.3. Thin Section Petrology

Nine thin-sections were prepared for petrographic analysis and were stained for potassium feldspar and calcic plagioclase identification. Four-hundred framework-grains were counted for each sample following the Ganzi-Dickinson method to minimize grain-size effects

[Dickinson, 1970; Ingersoll et al., 1984]. Results were plotted using a Microsoft Excel-based method by Zahid and Barbeau [2011] on four ternary diagrams depicting provenance and tectonic relationships such as; sediment maturity (QtFL), source rock (QmFLt), feldspar fragments (QmPK), and lithic fragments (QpLvLs) [Ingersoll, 1978; Dickinson and Suczek,

1979; Dickinson, 1985]. Petrographic data are in Appendix IV.

3.5. Results

3.5.1. Stratigraphy

The WGB stratigraphy contains ~ 800 m of oxidized, red to purple nonmarine strata

(Figure 3.2). The basal unit, unit 1, is not well exposed. Where present, the base is interbedded clast-supported pebble conglomerate (5-10 m thick) and mudstone/siltstone layers, for a total thickness of ~ 200 m (Figure 3.3). Stratigraphically above unit 1, unit 2 consists of an ~ 400 m thick sequence of mudstone, interbedded with fine- to medium-grained sandstone. Sandstone beds are medium-bedded, locally contain cross-bedding, and are laterally continuous.

Stratigraphically above unit 2, unit 3 exhibits ~ 200 m of predominantly fine- to medium-grained sandstone interbedded with thin (< 1 m thick) mudstone beds, capped by a 5 m thick clast- supported pebble conglomerate.

Figure 3.2. Stratigraphic columns and correlation for a) the eastern Yidun terrane, b) west Ganzi basin, and c) east Ganzi basin. Stratigraphic positions and sample number are shown for detrital zircon samples in the Yidun Group by Wang et al. [2013] and Ding et al. [2013], and the WGB and EGB samples from this study. Units 1, 2, and 3 are correlated in columns b and c. Scale bar is only for columns b and c.

Figure 3.3. Field photographs from the WGB and EGB illustrating examples of unit 1, 2, and 3 stratigraphic intervals. a) Dipping interbedded conglomerate, mudstone, and sandstone in the WGB representative of unit 1 strata. b) Interbedded sandstone and mudstone indicative in the EGB representative of unit 2 strata. c) Clast-supported conglomerate in the WGB representative of conglomerate in unit 1. Field book used for scale determination.

65 The EGB stratigraphy contains ~ 1,300-1,600 m of oxidized white to red-purple nonmarine strata (Figure 3.2). The basal unit, unit 1, varies from the western part to the eastern part of the basin, containing a total thickness of ~ 500-800 m. Throughout the western part of the

EGB, unit 1 consists of 3-8 m thick granule-pebble conglomerate beds interbedded with mudstone/siltstone and sandstone, while in the eastern part of the EGB, unit 1 consists of a 30-50 m thick conglomerate, overlain by interbedded 10 cm to 2 m thick granule conglomerate and sandstone beds with increasing mudstone beds upsection. Stratigraphically above unit 1, unit 2 consists of ~ 500 m of mudstone/siltstone interbedded with 1-5 m thick beds of fine- to medium- grained sandstone (Figure 3.3). Stratigraphically above unit 2, unit 3 is a coarsening-upwards sequence of interbedded mudstone/siltstone and sandstone for ~ 100 m, with ~ 200 m of fine- to medium-grained sandstone upsection.

Conglomerate throughout the WGB and EGB are clast-supported and commonly exhibit crude horizontal planar stratification and imbrication, with rare long-angle planar cross-bedding

(Figure 3.3). Matrix commonly consists of fine-grained sand to granule, but in some places in unit 1 the matrix consists of orange, moderately well-sorted very fine to medium-grained sand.

Clast sizes ranging from 2-20 cm, with an average size of ~ 4 cm. Cobble-sized clasts are typically very angular to subangular, whereas pebble-sized clasts are typically subrounded to rounded. Clasts consistently exhibit indentations and ridges. Clast lithologies identified include red sandstone, red siltstone, red shale, white sandstone, tan/lithic sandstone, dark-gray to black shale/slate, granite, phyllite, vein quartz, quartzite, and reworked clasts of matrix (Figure 3.4).

3.5.2. Basin Boundaries and Structure

Basin boundaries for the WGB and EGB exhibit either a fault or unconformable contact with Triassic turbidites and Triassic Yidun Arc (Ganzi Pluton) rock (Figure 3.5, 3.6). The WGB

66 northern boundary is an ENE-WSW oriented, reverse fault that dips 55° NNW, and in plain-view it curves away from the basin near both fault tips at the NW and NE ends (Figure 3.5). The fault places deformed Triassic Yidun Group turbidites in the hanging wall over granite of the Ganzi

Pluton and nonmarine growth strata in the footwall (Figure 3.6a, 3.6b). The WGB southern boundary is an ESE-WNW oriented reverse fault that dips 60° SW, and places deformed Triassic

Yidun Group turbidite rock in the hanging wall over granite of the Ganzi Pluton and nonmarine growth strata in the footwall. Bedding dip of the growth strata systematically decreases up section and basinward from ~ 75-90° adjacent to the fault to nearly horizontal ~ 20-25 m away from the growth fault. This progressive decrease in bedding dip and the decrease in bed thickness toward the fault indicates synchronous fault-slip and progressive bed tilting with sedimentation, which was greatest during early stages of basin deposition and decreased with time. Growth strata contain interbedded conglomerate and mudstone, with an overall fining upward trend. The

WGB northeastern boundary reverse fault is oriented NNE-SSW and dips 49° ESE, slightly shallower than the bounding faults of the southern boundary. The WGB northeastern boundary reverse fault places Yidun Group turbidites over folded nonmarine strata (Figure 3.6b). The eastern and western WGB contacts could not be accessed to observe directly; however, the color contrast between the red nonmarine strata and gray to dark gray Triassic plutons and turbidites allows for contacts to be delineated using satellite imagery. In the WGB, a strike-slip fault offsets strata ~ 8 km in the central portion of the basin, exhibiting a right-lateral sense of shear.

The fault is oriented ~ 300°, and cross-cuts older compressional features. Fault displacement dissipates towards the east, with no discernable expression in the EGB.

In the western part of the EGB the northern boundary is a nonconformity between EGB strata and the underlying granite of the Triassic Ganzi Pluton (Figure 3.6c), while the eastern part

67 is characterized by an angular unconformity between EGB strata and the underlying, vertically dipping, Triassic Yidun Group turbidites. The southern EGB boundary is a reverse fault that places Triassic Yidun Group turbidites over nonmarine strata, and is oriented ~ NW-SE. From northwest to southeast, the fault plane dips toward the southwest and steepens from 57° to 85°.

The western EGB boundary in places is a nonconformity between nonmarine strata and the

Ganzi Pluton and elsewhere is an angular unconformity between the nonmarine strata and Yidun

Group turbidites. The eastern EGB boundary is an angular unconformity between the nonmarine strata and the Yidun Group turbidites.

Bedding measurements in both the WGB and EGB are variable because of internal folding; however, an average orientation is ~ 070, 33° SSE (Figure 3.7a). In the EGB, a ~ 5 km long, ~ 0.5 km wide syncline exists (Figure 3.7b). This syncline, along with other smaller outcrop scale folds measured throughout the EGB, exhibit ~ 10-20° plunges and trends of ~ 140-

155° (Figure 3.7c). Non-axial planar cleavage was measured within folded strata in the WGB.

Analysis of fracture orientations combined with chronological relationships (i.e. abutting interfaces) reveals multiple fracture sets in the WGB and EGB (Figure 3.7d, 3.7e). A dominant ~ east-west fracture set exists in the WGB and EGB that is one of, if not, the youngest fracture set, based on abutting relationships.

3.5.3. Detrital Zircon Geochronology

Detrital zircon ages (n = 775) were collected from 7 samples throughout the WGB and

EGB (stratigraphic position of samples in Figure 3.2; geographic location of samples in Figure

3.4). Results illustrate major age peaks at 200-250 Ma, 250-300 Ma, 400-480 Ma, 720-880 Ma,

900-1,000 Ma, ~1,800 Ma, and ~ 2,450 Ma (Figure 3.8). Minor age peaks are present at 1,100-

1,200 Ma and 1,400-1,500 Ma.

Figure 3.4. Field clast counts from conglomerate intrabeds in the WGB and EGB.

Figure 3.5. Simplified geologic map of the WGB and EGB, northeastern Yidun terrane. Yellow circle and corresponding number correlate to detrital U-Pb zircon sample. Blue circle and number correlate to conglomerate clast counts. Green circle and corresponding number correlate to the thin-section sample. Red stars indicate location of field photographs corresponding to noted figure in text. North is rotated approximately 25° west.

Figure 3.6. Examples of basin-boundary contacts in the WGB and EGB. a) Growth strata in the footwall of the WGB northern boundary thrust fault. b) Corresponding illustration to Figure 6a. c) Nonconformable contact between nonmarine strata and underlying Triassic Ganzi Pluton rock along the EGB northern basin boundary. d) Corresponding illustration to Figure 6c. e) The WGB thrust fault along the northeastern basin boundary, placing Triassic Yidun group turbidite over tightly folded WGB nonmarine strata. f) Corresponding illustration to Figure 6e. Locations of pictures are labeled in Figure 5.

Figure 3.7. A) Northern hemisphere stereographic projection of bedding measurements. Measurements plotted as poles to bedding and contoured at the 2% level. B) Basin scale syncline in the EGB (location shown in Fig. 4). C) Stereographic representation of folds (poles) and faults (great circles) measured in the WGB and EGB. D) Orthogonal fracture development in-between layers with low-angle fractures, illustrating multiple generations. E) Rose diagram of fracture measurements in the WGB and EGB. F) Schematic cross-section of the west Ganzi basin. G) Schematic cross section of the east Ganzi basin. Location of both cross section lines in Fig. 4. Topographic profiles established through GeoMapApp 3.6.2 (http://www.geomapapp.org/).

Figure 3.8. Detrital zircon geochronology results from the WGB and EGB. Histograms represent 50 Ma. Kernel density estimation curves calculated with a 15 bin size, normalized to area. Gray shaded areas represent corresponding age populations for multiple samples.

Figure 3.9. Petrographic results from nine WGB and EGB samples. A) Qt-F-L plot. Cl – craton interior, TC – transitional continental, BU – basement uplift, RO – recycled orogenic, DA – dissected arc, TA – transitional arc, UA – undissected arc. B) Qm-F-Lt plot. Cl – craton interior, TC – transitional continental, BU – basement uplift, RO – recycled orogenic, M – mixed, DA – dissected arc, TA – transitional arc, TR – transitional recycled, LR – lithic recycled, UA – undissected arc. C) Qm-P-K plot. CBP – continental block provenance, MAP – magmatic arc provenance, ROP – recycled orogen provenance. D) Qp-Lv-Ls plot. SCS – subduction complex sources, AOS – arc orogen source, CS-FTBS – collision suture & fold-thrust belt sources.

74 Sample 14WG15 is stratigraphically the highest sample collected in the WGB within unit

3 (Figure 3.8a). One hundred and sixty-nine ages were determined with concentrated age populations at 200-220 Ma, 450 Ma, ~ 950 Ma, ~ 1,800 Ma, and ~ 2,400 Ma. The youngest detrital zircon population (n = 25) produced a weighted mean average of 216.84 ± 0.86 Ma.

Sample 13AWJ1 is stratigraphically below 14WG15 and above 13FS4244, within the upper part of unit 2 (Figure 3.8b). Eighty-eight ages were determined with concentrated age populations at ~ 2500 Ma, ~ 1800 Ma, ~ 800-850 Ma, 450 Ma, and ~ 250 Ma. The youngest detrital zircon population (n = 6) produced a weighted mean average of 246 ± 11 Ma.

Sample 13FS4244 is stratigraphically below 13AWJ1 and above 13WJ002, within the lower part of unit 2 (Figure 3.8c). Eighty-nine ages were determined from the sample with concentrated age populations are at ~ 2500 Ma, ~ 1800 Ma, ~ 800-850 Ma, and 200-220 Ma. The youngest detrital zircon population (n = 20) produced a weighted mean average of 213.5 ± 2.4

Ma.

Sample 13WJ002 is stratigraphically the lowest sample collected in the WGB within unit

1 (Figure 3.8d). Ninety-two ages were determined with concentrated age populations at ~ 2400

Ma, ~ 1800 Ma, ~ 1600 Ma, ~ 1200 Ma, ~ 950 Ma, ~ 550 Ma, 400-450 Ma, and 200-230 Ma.

The youngest detrital zircon population (n = 6) produced a weighted mean average of 213.6 ± 6.9

Ma.

Sample 14EG06b is stratigraphically the highest sample collected in the EGB within unit

3 (Figure 3.8e). Eighty-eight ages were determined with concentrated age populations at ~ 2500

Ma, ~ 1800 Ma, ~ 1400 Ma, ~ 1200 Ma, ~ 850 Ma, ~ 450 Ma, 200-220 Ma. The youngest detrital zircon population (n = 7) produced a weighted mean average of 215.9 ± 1.5 Ma.

75 Sample 14EG27 is stratigraphically below 14EG06b and above 14EG05, within the upper part of Unit 2 (Figure 3.8f). Eighty-six ages were determined with concentrated age populations at ~ 2500 Ma, ~ 1800 Ma, ~ 800-850 Ma, 450 Ma, and ~ 250 Ma. The youngest detrital zircon population (n = 6) produced a weighted mean average of 238.9 ± 9.0 Ma.

Sample 14EG05 is stratigraphically the lowest sample collected in the EGB, within the lower part of Unit 2 (Figure 3.8g). One hundred and sixty-three ages were determined with concentrated age populations at ~ 2500 Ma, ~ 1800 Ma, ~ 800-850 Ma, 450 Ma, and ~ 250 Ma.

The youngest detrital zircon population (n = 6) produced a weighted mean average of 215.2 ± 1.7

Ma.

3.5.4. Petrology analysis

Minerals documented during petrology analysis include: monocrystalline quartz, polycrystalline quartz, plagioclase feldspar, potassium feldspar, volcanic/meta-volcanic lithic fragments, sedimentary/meta-sedimentary lithic fragments, and matrix. Framework-grain modal composition of all nine samples plotted in the recycled orogenic field of the QtFL provenance discrimination ternary diagram (Figure 3.9a), the transitional recycled field for the QmFLt provenance discrimination ternary diagram (Figure 3.9b), the recycled orogen provenance for the

QmPK provenance discrimination ternary diagram (Figure 3.9c), and the collision suture and fold-thrust belt sources field for the QpLvLs provenance discrimination ternary diagram (Figure

3.9d).

3.6. Interpretations

3.6.1. Depositional Environments

We interpret the depositional environment for unit 1, in both the WGB and EGB, to be alluvial fan deposits because of the indentions and ridges of conglomerate clasts. Unit 1 facies

76 variation in the EGB is interpreted to reflect paleo-topographic relief of the unconformity surface developed on top of the Triassic Ganzi Pluton and Yidun Group turbidites. The depositional environment for unit 2 is interpreted as a fluvial, lower energy deposit, because of a fine-grained clastic rock sequence. The depositional environment for unit 3 is interpreted as a fluvial, medium- to high-energy deposit, because of the increase to a medium- to coarse-grained predominantly sandstone sequence, which locally contains ripple-beds.

3.6.2. Age of Strata

Nonmarine strata examined in the WGB and EGB share similarities with other nonmarine deposits in the Tibetan Plateau that exhibit Jurassic through Eocene ages, such as basal conglomerate units, red color, and fining upward sequence [e.g., Horton et al., 2002; Wang et al.,

2014]. The WGB and EGB did not contain volcanic ash layers, fossils, or dateable cross-cutting relationships to demonstrate stratigraphic age. In addition, samples selected for palynological analysis proved to be barren. Detrital zircon geochronology, therefore, provides the best technique to determine nonmarine stratigraphic ages.

The use of detrital zircon geochronology in assigning stratigraphic age boundaries relies on establishing the maximum depositional age of strata based on the youngest analyzed zircon grain(s) [e.g., Dickinson and Gehrels, 2009a]. When positioned in stratigraphic succession the weighted mean averages from the WGB and EGB illustrate a coherent maximum depositional age of ~ 215 Ma (Figure 3.10). In addition, Figure 3.10 illustrates that each basin contains one sample, located in the middle- to upper-portion of basin stratigraphy (unit 2), that produces a maximum depositional age of ~ 238-246 Ma. This correlation supports an interpretation that both basins were deposited coevally in the same system during Mesozoic time.

Figure 3.10. Maximum depositional ages, obtained by calculating weighted mean averages from the WGB and EGB. Samples are ordered based on the specific basin and stratigraphic position. Every detrital zircon that yielded an age between 200-260 Ma is plotted, with the bold colored bars indicating the grains included in the weighted mean average calculation. Statistics for each sample included in corresponding colored box. Bars represent 2σ error. Based on correlation of all seven samples, the maximum depositional age for the WGB and EGB is 215 Ma.

78 The maximum depositional age of the youngest zircon grains forming a coherent age population in the WGB and EGB is 215 Ma. This is slightly older that the Rhaetian (203-199

Ma) Lamaya Formation, the stratigraphically youngest formation in the Yidun Group

[BGMRSP, 1991], suggesting that the true depositional age for the WGB and EGB is younger than the calculated maximum depositional age indicated by detrital zircon geochronology.

Cretaceous palynology results from the WGB indicate a late Mesozoic age for the WGB and

EGB. The lack of 165-190 Ma zircon from Bangong Arc volcanism [Guynn et al., 2006] indicates deposition in the WGB and EGB did not likely occur during Early or Middle Jurassic time. The Cheur Pluton, located ~ 25 km west of the WGB, along with the overall Cretaceous plutonic suite in the Yidun terrane was emplaced ~ 90 Ma [Reid et al., 2007]; the lack of

Cretaceous zircon in the WGB and EGB suggests a depositional age that post-dates pluton emplacement. However, the WGB and EGB lack Eocene zircon grains, a population present in the Mula basin, located in the southern Yidun terrane [Jackson et al., this volume]. Therefore, we interpret the deposition of WGB and EGB strata to have occurred between ~ 90-65 Ma.

3.6.3. Sediment Provenance

Thin section petrology and field clast counts indicate that WGB and EGB strata were sourced from a recycled orogenic source of Triassic plutonic and Triassic Yidun Group turbidite rock, with additional contributions from Triassic plutonic rock. To further discriminate the provenance of WGB and EGB strata, we compare detrital zircon results and previously published regional curves.

Previous detrital zircon studies conducted on Yidun terrane turbidites show age peaks at

220-240 Ma, 400-480 Ma, 720-880 Ma, 880-980 Ma, 1,790-1,900 Ma, and 2,450-2,5000 Ma

[Wang et al., 2013b; Ding et al., 2013]. Wang et al. [2013b] show that the northern and southern

79 Yidun terrane exhibit different detrital zircon signatures for time equivalent turbidites, suggesting two different depocenters. Turbidites in the northern Yidun terrane contain only two prominent age peaks at 400-480 Ma and 880-980 Ma, with a third minor age peak at 2,450-2,500

Ma. In comparison, turbidites in the southern Yidun terrane contain the three age peaks in northern Yidun turbidites along with peaks at 220-240 Ma, 720-880 Ma, and 1,750-1,900 Ma

[Wang et al., 2013b; Ding et al., 2013]. Studies conducted on Triassic Songpan-Ganzi terrane turbidites from the southeastern depocenter show age peaks that correspond to all the observed age peaks in the Yidun Group, with populations at 220-250 Ma, 400-500 Ma, 730-820 Ma, ~

1,850 Ma, and ~ 2,400 Ma [Weislogel et al., 2006; 2010; Ding et al., 2013].

Comparison of regional detrital zircon geochronology curves of the southern and northern Yidun terrane and SE Songpan-Ganzi turbidites to WGB and EGB curves shows striking similarities (Figure 3.11). The WGB and EGB curves are most dissimilar to the northern

Yidun Group turbidite curve, rocks that the WGB and EGB overlie and are in fault contact with.

Because of the lack of < 400 Ma grains, Figure 3.11c compares the four curves with only grains

> 400 Ma, where a difference between WGB and EGB nonmarine strata to the northern Yidun turbidites remains the most dissimilar. K-S statistical tests on the regional curves indicates WGB and EGB curves are most similar to southern Yidun terrane and SE Songpan-Ganzi turbidite curves. These data suggest that WGB and EGB sediment was sourced from rocks of the southern

Yidun Group and SE Songpan-Ganzi to the south-southeast.

Triassic zircons (108 grains), presumably derived from Yidun Arc plutons, make up the youngest detrital zircon age population(s) at ~ 216 Ma and ~249 Ma in the WGB and EGB, respectively (Figure 3.12a, 3.12b). The Late Triassic age peak matches within error to the age peak of zircon ages obtained for the underlying Yidun Arc Ganzi Pluton, which has been dated at

80 ~ 218 Ma [Reid et al., 2007; Weislogel, 2008] (Figure 3.12c). Other Yidun Arc plutons, including the largest, the Daocheng Pluton located to the south-southeast of the WGB and EGB, are also dated at 215-220 Ma [He et al., 2013] (Figure 3.12d).

However, grains older than 230 Ma in the WGB and EGB cannot be sourced from the local Ganzi Pluton; thereby, the Early Triassic grains in the WGB and EGB must have originated from some other source. Identifying the origin of these grains proves difficult based on U-Pb age alone because zircon of this age are present both in surrounding plutons as well as in the flanking

Yidun Group and Songpan-Ganzi complex strata (southeastern depo center). Plutons of the

Jiangda-Weixi Arc to the south-southwest that intrude the Jinsha Accretionary Complex and

Zhongza Massif in the western portion of the Yidun terrane contain ages from 230-270 Ma with an age peak at ~ 242 Ma [Reid et al., 2007; Peng et al., 2014] (Figure 3.12h); however, any sediment routed from this source most likely would have also transported Cretaceous zircon grains. The plutons of the Yidun Arc range in age from 210-260 Ma [e.g., Peng et al., 2014]. It is possible that material were eroded from these igneous rocks and transported into the Ganzi basins; however, it is likely that any sizeable sedimentary transport system capable of routing sediment from plutons to the north or south would have also included Cretaceous zircons.

The detrital zircon signature of the Yidun Group strata immediately adjacent to the Ganzi basin, referred to as the northern Yidun Group by Wang et al. [2013] and Ding et al. [2013], lacks the Early Triassic grains in the WGB and EGB. However, northern Yidun Group rocks do contain Paleozoic (~ 450 Ma) grain ages along with abundant late Mesoproterozoic (~ 1.0 Ga) grain ages, and a small population of Archean (~ 2.5 Ga) grain ages. These age populations appear in the WGB and EGB, and could have originated from a northern Yidun Group source.

Rocks of the southern Yidun Group do show a small population of Early Triassic ages (240-250

81 Ma) as well as Neoproterozoic ages (~ 800 Ma), which are present in the WGB and EGB but absent in norther Yidun Group. In addition, the southern Yidun Group contains Paleozoic (~ 450

Ma), Neoproterozoic (~ 750 Ma), and Paleoproterozoic (~ 1.8 Ga) ages, and a small cluster of

Archean (~ 2.5 Ga) grains, ages that are all observed in the WGB and EGB. However, a southern

Yidun Group source would require a large sedimentary transport system that would also have likely included zircon from Cretaceous magmatic rocks. One possibility is that the southern

Yidun Group strata were adjacent to the Ganzi basins during Late Mesozoic-Early Cenozoic deposition and served as sources of sediment, and later were translocated southeastward by

Cenozoic strike-slip fault deformation.

Alternatively, multiple plutons in the southeastern Songpan-Ganzi depocenter have ages ranging from 205-235 Ma, and contain two age peaks at ~ 212 Ma and ~ 225 Ma [Xiao et al.,

2007; Weislogel, 2008] (Figure 3.12e). The southeastern Songpan-Ganzi turbidites also contain detrital zircon signatures that show Triassic age peaks at 240-250 Ma [Weislogel et al., 2010]. It is possible that highlands formed from southeastern Songpan-Ganzi rocks, were eroded and contributed the Triassic ages, as well as the late Paleozoic, Neoproterozoic, Paleoproterozoic, and Archean grains as observed in the WGB and EGB (Figure 3.13).

3.6.4. Tectonic Setting

We interpret that the WGB and EGB formed in a compressional deformation regime based on reverse fault contacts along basin boundaries with associated growth strata and parallel fold-axis trends. The strike-slip fault, which offsets the WGB, is interpreted to be associated with a network of Late Cenozoic faults associated with extrusion and clockwise rotation of Tibetan

Plateau crustal material around the eastern Himalayan syntaxis [Burchfiel et al., 1995; Wang et al., 1997; Wang and Burchfiel, 2000; Clark et al., 2005]. The primary east-west fracture

82 orientations present in the WGB and EGB are interpreted to have developed during the Early

Cenozoic strike-slip displacement. Based on abutting relationships, the smaller fracture sets orientated at acute angles to the prominent east-west set, correspond to R and Rʹ fractures and/or prior compressional folding phases. The multiple generations of deformation suggested by the fracture data in the WGB and EGB is corroborated by outcrop measurements where cleavage within folded strata exhibited non-axial planar cleavage, indicating a later deformational imprint on the previously folded strata.

3.7. Discussion

3.7.1. Tectonic Model

We propose the following tectonic model for the development of the WGB and EGB

(Figure 3.13). During Middle-Late Cretaceous time a NE-SW regional scale fold-thrust belt developed along the eastern Yidun terrane in response to the Lhasa-Qiangtang collision. This resulted in uplift of Triassic turbidite and Yidun Arc rock. Erosion and north-northwest transport provided sediment and filled accommodation space in the WGB and EGB, and syntectonic deformation created growth strata along the basin boundaries in the upper portion of basin stratigraphy unit 3. Estimation of the scale of shortening in the Yidun terrane during this phase of deformation is limited by the thermochronology cooling signatures [Reid et al., 2005b; Roger et al., 2010; Wilson and Fowler, 2011] and the lack of regional correlation to other Mesozoic structures at this time. Locally < 10 km of offset along the basin bounding faults of the WGB and

EGB suggest that shortening was relatively minor. The Late Triassic Ganzi-Litang suture is ~ 5-

10 km northeast of the WGB and EGB and operated as a crustal zone of weakness and the locus of deformation associated with WGB and EGB formation.

Figure 3.11. a) Kernel density estimation curves (15 bin size) for a composite of all seven samples from Figure 8: WGB-EGB, northern Yidun terrane turbidites, southern Yidun terrane turbidites, and SE Songpan-Ganzi turbidites. Gray shaded areas represent corresponding age populations. b) Cumulative density plots (CDP) for the WGB-EGB, northern Yidun terrane turbidites, southern Yidun terrane turbidites, and SE Songpan-Ganzi turbidites. c) CDP curves from same data in A and B, excluding all grains < 400 Ma.

Figure 3.12. Calculated U-Pb ages for plutons in the Yidun and southeastern Songpan-Ganzi terranes (geographic locations shown in Figure 1 and in Appendix I). Histogram bars and kernel density estimation curve for: a) 200-260 Ma WGB grains, b) 200-260 Ma EGB grains, c) Ganzi Pluton, d) Daocheng Pluton, e) plutons located in the southeastern Songpan-Ganzi terrane, f) Maxionggou Pluton, g) Shengmu Pluton, and h) Suwalong Pluton.

Figure 3.13. Tectonic model for development of the Mesozoic WGB and EGB in the northern Yidun terrane. a1/a2) Permian-Early Triassic time: Zhongza Massif migration and collision with the Qiangtang terrane, resulting in the development of the Jinsha Accretionary Complex. b) Middle Triassic time: Turbidite deposition and initiation of Ganzi-Litang suture subduction. c) Middle-Late Triassic time: Yidun Arc establishment, turbidite mixing between Yidun and Songpan-Ganzi terranes, and regional compression. d) Jurassic-Middle-Late Cretcaeous time: Continued regional compression, aerial exposure of turbidtes and Triassic plutons, nonmarine WGB and EGB deposition and deformation.

86 3.7.2. Mesozoic vs Cenozoic Yidun Terrane Nonmarine Basins

The Eocene Mula basin, located in the southern Yidun terrane, similarly indicates development in a compressional deformation regime associated with local sediment provenance

[Jackson et al., this volume]. In contrast, detrital zircon geochronology (Late Triassic maximum depositional ages) and palynology (Cretaceous) results illustrate a latest Cretaceous-Paleogene age for WGB and EGB strata.

The overall stratigraphic architecture is similar between the Cenozoic Mula basin and the

Mesozoic WGB and EGB, with a lower, dominantly conglomeratic unit (unit 1 for WGB/EGB and Mula basin) overlain by a finer-grained mudstone dominated succession (unit 2 for

WGB/EGB and Mula basin). The primary difference in stratigraphic architecture is present in unit 3 for the WGB/EGB and Mula basin. In the Mula basin, unit 3 consists of fine-grained mudstone and shale, interbedded with small (< 1 m thick) siltstone to fine-grained sandstones, thus continuing the upward-fining trend of basin stratigraphy. In the WGB and EGB, unit 3 consists of interbedded sandstones and mudstones, a massive (~ 150 m thick) fine-grained sandstone, capped by interbedded conglomerate and mudstone. Unit 3 in the WGB and EGB represents a coarsening-upward trend at the top of basin stratigraphy.

The overall shape of the WGB and EGB differs from that of the Mula basin. The Mula basin is narrow and elongate in shape, parallel to the basin’s bounding thrust fault along the eastern border. The WGB and EGB express more ellipsoidal geometric shapes that presumably are a result of erosion and not representative of basin formation geometry.

While results from the Mula basin indicate a local sediment source, provenance analyses of WGB and EGB strata illustrate a regional sediment source. This regional provenance source shows a drastic difference compared to the local provenance sources that characterize Paleogene

87 nonmarine basins in the region. The transit paleoflow direction was a direct response to uplift that began in the southeast and migrated northwestward.

3.7.3. Broader Implications

Our results suggest that East Tibet experienced upper-crustal shortening at least three time prior to the onset of eastward extrusion and prominent strike-slip deformation. The first shortening event, a result of northward migration of the Qiangtang/Zhongza Massif block through the Paleo-Tethys Ocean, is recorded by the highly deformed Triassic turbidites and emplacement of the Late Triassic plutons in the Yidun terrane and southeastern Songpan-Ganzi terrane. The second shortening event, a result of the Lhasa and Qiangtang terrane collision, is recorded by the development of the WGB and EGB in the northern Yidun terrane during the Late

Cretaceous-Paleogene. The last shortening event, a result of far-field strain associated with the

India-Asia collision, is recorded by Eocene Mula basin in southern Yidun terrane.

3.8. Conclusions

The west Ganzi basin and east Ganzi basin in the northern Yidun terrane contain a record of deposition and deformation prior to the Cenozoic India-Asia collision. This study yields the following conclusions:

1. The west and east Ganzi basins contain ~ 800 m and ~1,600-1,800 m of nonmarine strata,

respectively, deposited in alluvial and fluvial environments.

2. Maximum depositional ages, calculated from youngest detrital zircon populations,

demonstrate a Late Cretaceous-Paleogene age for the west and east Ganzi basins.

3. Reverse faults and growth strata along basin boundaries, in addition to internal large and

small-scale folding suggest that basin deposition occurred syntectonically in a

compressional deformation regime.

88 4. Detrital zircon geochronology, field clast counts, and petrology data indicate that west

Ganzi basin and east Ganzi basin strata were sourced regionally from recycled southern

Yidun terrane and southeastern Songpan-Ganzi turbidites, along with influx from erosion

of Late Triassic Yidun Arc plutonic rock.

5. During Late Cretaceous-Paleogene time a regional northeast-southwest directed fold-

thrust belt developed along the eastern Yidun terrane as a result of the Lhasa and

Qiangtang collision.

Acknowledgments

This project was supported by the U.S. National Science Foundation grants EAR-

1119266 (Robinson), EAR-1119219 (Weislogel), and a Geological Society of America student research grant (Jackson). The University of Alabama Graduate School and Department of

Geological Sciences provided funding for travel. We appreciate the analytical assistance provided by the Arizona LaserChron Lab, especially Mark Pecha and Nicky Geisler. Chunmiao

Zheng (Peking University) assisted in securing travel permits.

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CHAPTER 4:

EARLY CENOZOIC REACTIVATION OF THE TRIASSIC GANZI-LITANG SUTURE RECORDED BY DETRITAL ZIRCON GEOCHRONOLOGY: IMPLICATIONS FOR STRAIN PARTITIONING IN THE EASTERN TIBETAN PLATEAU

4.1. Abstract

Suture zones in interior parts of the Tibetan Plateau delineate progressive sites of

Mesozoic terrane collisions along the southern margin of Eurasia. Understanding the spatial and temporal evolution of these suture zones is a first-order requirement for tectonic models. Located in the eastern Tibetan Plateau, the Ganzi-Litang suture (GLS) developed in Late Triassic time as a result of the eastern Paleo-Tethys ocean closure. The GLS is defined by a mélange sequence with fault-bounded nonmarine strata along the structural flanks of the suture. We present structural and sedimentological field measurements, detrital zircon geochronology, and Hf isotope geochemistry data to determine the tectonic history of the GLS and establish a stratigraphic age and sedimentary provenance for the nonmarine strata. Detrital zircon geochronology and Hf isotope values indicate a local sedimentary provenance of Triassic Yidun

Arc plutonic and Yidun Group turbidite rock. A weighted mean average of the youngest detrital zircon age population establishes a maximum depositional age of 41.56 ± 0.91 Ma for the nonmarine strata. We interpret the fault-bounded nonmarine strata in the GLS to have developed in response to reactivation along the suture in Eocene time, a result of far-field compression associated with the initial phases of the India-Asia collision. Therefore, the GLS acted as a crustal zone of weakness where strain was preferentially partitioned. Deformation along the GLS

95 most likely delineates the boundary of northward-propagating deformation and nonmarine deposition associated with the outgrowth of the Tibetan Plateau during Eocene time.

4.2. Introduction

Suture zones, defined by ophiolite and mélange rock, are located throughout the Tibetan

Plateau and mark sites of oceanic lithosphere destruction resulting from Mesozoic terrane collisions [Dewey, 1977; Dewey et al., 1986; 1988]. Reactivation of pre-existing sutures is a fundamental feature of lithospheric deformation that governs many tectonic processes within orogenic belts and rifted margins [Molnar, 1988; Daly et al., 1989]. These zones of weakness tend to preferentially reactivate because of their lack of lithospheric strength [e.g., Thatcher,

1995]. Reactivation associated with the transfer of far-field tectonic stresses typically causes repeated deformation that is partitioned and accommodated along series of complex displacements, internal strain, and crustal block rotations [Dewey et al., 1986]. Sedimentary strata preserved in and adjacent to sutures contain records of deformation and tectonic development for these complex regions that otherwise is masked or lost [e.g., Ridgeway et al.,

2002; Kapp et al., 2007; Orme et al., 2015; Metcalf and Kapp, 2017].

The spatial and temporal development of strain throughout the interior portions of the

Tibetan Plateau during the Paleogene are parameters essential for many tectonic models pertaining to the outgrowth of the plateau in response to the India-Asia collision [Horton et al.,

2002; 2004; Spurlin et al., 2005; Studnicki-Gizbert et al., 2008; Staisch et al., 2014]. Previous studies have shown reactivation along Mesozoic sutures during the Early Cenozoic occurred in response to the India-Asia collision [Kapp et al., 2003; 2005]. In the eastern Tibetan Plateau, reactivation has occurred along the Jinsha suture [e.g., Burchfiel et al., 1995; Reid et al., 2005a]; however, questions remain pertaining to the spatial and temporal initiation of strike-slip

96 deformation throughout the eastern Tibetan Plateau and the extent of Late Mesozoic-Early

Cenozoic shortening that may have been accommodated by structures in these zones.

Approximately 25 km south of the village of Litang, in southwestern Sichuan Province,

China, a mélange sequence defining the Late Triassic Ganzi-Litang suture (GLS) contains fault- bound nonmarine strata similar to other nonmarine basins in the Yidun terrane. Jackson et al.

[2017a; 2017b] state that nonmarine strata in the Yidun terrane are Cretaceous and Eocene.

Therefore, the presence of nonmarine strata within the GLS suggests reactivation. The purpose of this study is to address the depositional age and sedimentary provenance of the nonmarine strata to better determine the tectonic development of the GLS and its potential for recording suture zone reactivation during post-Triassic evolution of the eastern Tibetan Plateau. We present detrital zircon U-Pb geochronology and Hf isotope geochemistry, along with sedimentological and structural field measurements from the GLS. Our results bracket the timing of reactivation along the GLS and illustrate the spatial evolution of deformation and nonmarine deposition throughout the eastern Tibetan Plateau.

4.3. Geologic Background

The GLS is ~ 550 km in length and marks the boundary between the Yidun and Songapn-

Ganzi terranes (Figure 4.1). To the northwest, the GLS merges with the Jinsha suture and Jinsha

Accretionary complex. The termination of the GLS to the southeast is less defined, as it seems to dissipate in the Transitional zone between the Yangtze (South China block) and Qiangtang terranes [Burchfiel and Chen, 2012]. The mélange sequence that defines the GLS consists of quartzite, brecciated limestone, foliated chloritic schist, chert, and ultra-mafic rock [BGMSP,

1991; Reid et al., 2005].

Figure 4.1. Generlized tectonic map for the Yidun terrane and surrounding regions illustrating the geographic location of the Ganzi-Litang suture and study area. Adapted from Yin and Harrison [2000], Reid et al. [2005], and Wang et al. [2013].

98 Yidun Arc plutonic bodies, which crop out in the eastern Yidun terrane, west of the GLS are Late Triassic (215-224 Ma), calc-alkaline, I-type granites that regionally intruded highly deformed Triassic Yidun Group turbidite rock [Hou et al., 2001; Liu et al., 2006; Reid et al.,

2007; Wang et al., 2008]. The spatial distribution and geochemistry of the Yidun Arc suggest that the plutonic bodies were emplaced as a result of westward subduction of the Songpan-Ganzi terrane beneath the eastern Yidun terrane [Hou, 1993; Mo et al., 1993; Reid et al., 2007;

Weislogel, 2008; Peng et al., 2014].

Most researchers define the Jinsha suture to separate the Songpan-Ganzi and Qiangtang terranes and farther eastward the Qiangtang and Yidun terranes [Coward et al., 1988; Dewey et al., 1988; Yin and Harrison, 2000; Roger et al., 2003; Pullen et al., 2008; Gehrels et al., 2011].

However, Reid et al. [2005a], based off of structure and tectono-stratigraphic relationships in the

Yidun terrane and Qiangtang terrane, suggest that the GLS and Jinsha suture correlate to one another. In this hypothesis, the southern segment of the Jinsha suture would represent a separate suture zone, which developed from Qiangtang terrane and Zhongza Massif collision [Reid et al.,

2005a]. Yang et al. [2012] substantiate this hypothesis by showing that plutons in the Yidun Arc and northern Qiangtang terrane are similar in age and geochemistry.

4.4. Methods

4.4.1. Field Measurements

Investigation of the GLS was conducted during three field seasons in 2013 and 2014.

Sampling distribution and density were controlled primarily by rock type and accessibility.

Conglomerate clast counts and fracture measurements were collected to document sedimentological and structural relationships. For clast counts, the rock type of 50-100 clasts

99 were identified using 2 cm spacing over an ~ 1 m grid. Detailed rock descriptions, field data, and sample locations are in the Appendix I.

4.4.2. Detrital Zircon Geochronology and Hf Isotope Geochemistry

Five samples from nonmarine strata in the GLS were analyzed for detrital zircon geochronology. One to four kilograms of sample were collected from sandstone and granule conglomerate. Zircon grains were separated using heavy-liquid mineral separation methods at the

University of Alabama [Gehrels et al., 2006]. Unknown zircon grains, along with standard Sri

Lanka [Kroner et al., 1987; Gehrels et al., 2006] and R33 [Black et al., 2004] zircon fragments were mounted, abraded, polished, and imaged (back scatter electron) at the University of Arizona

LaserChron Center [Gehrels et al., 2006; 2008; Gehrels, 2014]. Isotope values were collected with a Nu Plasma multi-collector LA-ICP-MS (samples 14JB34 and 13JB014) and an Element 2 single collector LA-ICP-MS (samples 13JB028, 13JB015, and 14JB28). Zircon data reduction

(background, Hg, and fractionation corrections) were calculated in the excel software program

Agecalc [Gehrels et al., 2008]. Data are presented using figures produced in Isoplot [Ludwig,

2012] and DensityPlotter [Vermeesch, 2012]. Detrital zircon geochronology data are in

Appendix II.

From the five samples, thirty-seven detrital zircon grains were analyzed for Hf-isotopic values at the University of Arizona LaserChron Center following methods described by Gehrels and Pecha [2014]. Hf data were collected using a Nu Plasma HR ICP-MS coupled to a New

Wave 193 nm ArF laser ablation system. To ensure that the initial Hf isotope data were obtained from the same domain as the U-Pb age, laser ablation occurred on existing grain pits created during previous U-Pb analyses. An average of 5 analyses were collected from each sample, with

100 the goal to represent each of the prominent age populations identified from geochronology analyses.

4.5. Results

4.5.1. Ganzi-Litang Suture

The GLS near Litang is an ~ 5 km wide mélange rock sequence, consisting of units from west to east of Yidun terrane turbidite (Yidun Group), interbedded nonmarine conglomerate- sandstone-mudstone, meta-carbonate, schist, quartzite, ultra-mafic peridotite, meta-carbonate, nonmarine conglomerate-sandstone-mudstone, and Songpan-Ganzi turbidite units (Figure 4.2,

4.3). Subhorizontal Neogene strata lie in an angular-unconformity contact with GLS mélange rock throughout the area, with a thickness of 5-12 m (Figure 4.3a).

Along the western flank of the GLS, nonmarine strata (~ 35-40 m thick) are bound to the west by Yidun Group turbidite rock and to the east by GLS mélange rock. While a direct measurement of the bounding faults could not be identified, based on structural measurements of bedding planes directly above and below, both bounding faults are oriented ~ 155, 67°SW.

Along the eastern flank of the GLS, nonmarine strata are bound to the northeast by

Songpan-Ganzi terrane (SPG) turbidites and to the southwest by GLS mélange rock (Figure 4.4).

The southwestern fault places the meta-carbonate rock unit above the nonmarine strata and is oriented 125, 47°SW (Figure 4.4b). The northeastern fault has an overall reverse sense motion; however, a subsidiary normal fault defines the fault contact between SPG rock in the footwall and nonmarine strata in the hanging wall (Figure 4.4e). The fault zone is oriented 075, 75°NW.

Fracture measurements (n=256) in the nonmarine strata exhibit two sets, a prominent NE-

SW trend with an associated conjugate NW-SE trend and a minor N-S trend with a conjugate W-

E trend (e.g., Figure 4.2). Almost all fracture measurements illustrate subvertical dips. Based on

101 abutting relationships, definitive age determinations for older and younger fractures sets could not be determined. The primary NE-SW fracture trend and conjugate set trend perpendicular and parallel to nonmarine strata along the eastern flank, while the N-S trend and conjugate set trend parallel and perpendicular to nonmarine strata along the western and northern flanks of the GLS.

4.5.2. Nonmarine Strata

The nonmarine strata unit along the western and eastern flanks of the GLS is 35-40 m thick. Nonmarine strata consists primarily of red and maroon color conglomerate, with small (< 1 m) interbeds of mudstone, siltstone, and sandstone. Conglomerate units are clast-supported, with clasts ranging from 1-24 cm, exhibiting a biomodel size distribution of 1-4 cm clasts and 14-18 cm clasts. Imbrication in conglomerate clasts are sparse but locally present. Measured imbrications exhibit a paleoflow in NE and SE directions. Lithologic rock types for conglomerate clasts include gray, tan, and red sandstone, dark-gray to black shale/slate, schist, granite, ultra-mafic peridotite, meta-carbonate, quartzite, and quartz (Figure 4.5). In total, 610 clast counts were obtained that illustrate the following distribution: 19% sandstone, 21% shale/slate, 1% schist, 6% quartz, 17% granite, 12% ultra-mafic peridotite, 5% meta-carbonate, and 19% quartzite.

4.5.3. Detrital Zircon Geochronology and Hf Isotopes

Nonmarine strata along the western and eastern flanks of the GLS contain detrital zircon age populations at 40-50 Ma, 200-250 Ma, 250-300 Ma, 400-480 Ma, 720-880 Ma, 900-1000

Ma, ~ 1,800 Ma, and ~ 2,450 Ma (Figure 4.6). From all grains analyzed (n=947), age population representative distribution are 40-50 Ma (1%), 200-250 Ma (23%), 250-300 Ma (7%), 400-500

Ma (8%), 750-850 Ma (10%), ~ 1,000 Ma (6%), ~1,800 Ma (19%), ~2,500 Ma (7%). All other grains represent 19% occurrence. Thirteen zircon grains produced ages that were < 50 Ma.

102 Because all 5 detrital zircon samples occur in one stratigraphic unit and produced similar results, we combined all grains < 50 Ma into a single weighted mean average to establish a more robust maximum depositional age. The calculated weighted mean average of 41.56 ± 0.91 Ma for the

GLS nonmarine strata is based on 10 detrital grains (Figure 4.7). Three grains with ages < 50 Ma were excluded from the calculation because their 2-sigma error was statistically outside of the mean.

Zircon Hf isotope results from nonmarine strata in the GLS illustrate values that trend in an upward crustal evolution direction as the age of the analyzed grain increases, with the exception of the Eocene population values (Table 1). Eocene grains exhibit Hf values ranging from ~0.8 to -1.8. Triassic grains exhibit Hf values ranging from ~ -8 to -21. Pennsylvanian grains exhibit Hf values ranging from ~ 10 to -6. Late Ordovician grains exhibit Hf values ranging from ~ -4 to -8. Neoproterozoic grains exhibit Hf values ranging from ~ 6 to -7.

Mesoproterozoic grains exhibit Hf values ranging from ~ 6 to -11. Paleoproterozoic grains exhibit Hf values ranging from ~ 2 to -3 (~ 1,800 Ma population) and ~ 3 to 0 (~2,500 Ma population). Archean grains exhibit Hf values ranging from ~ 8 to -3.

4.6. Interpretation

4.6.1. Depositional Environment, Age, and Provenance of Nonmarine Strata

Because the nonmarine strata unit is predominantly conglomerate, red to maroon color indicative of oxidation resulting from subaerial exposure, and contains imbricated clasts with paleoflow directions sub-perpendicular to strike, we interpret the depositional environment to be an alluvial fan system. Because of the general lack of sandstone and mudstone interbeds throughout the nonmarine strata, we also interpret the strata to represent a proximal subenvironment in the alluvial fan architecture.

103

Figure 4.2. Geologic map of the GLS south of Litang. Insert illustrates schematic cross section line A-Aʹ. Green rose diagram bars and corresponding number represent paleflow measurements of clast imbrications in conglomerate. Red stars indicate location of detrital zircon geochronology sample.

104

Figure 4.3. Field photos from the Ganzi-Litang suture near Litang. a) Sub-horizontal Neogene strata. b) GLS quartzite unit. c) GLS ultra-mafic unit. d) GLS nonmarine strata along western flank. e) Triassic Songpan-Ganzi turbidite rock. f) GLS schist unit. g) GLS nonmarine strata along eastern flank.

105

Figure 4.4. The eastern boundary of the GLS ~ 25 km south of the city Litang. A) Schematic diagram illustrating structural relationship between nonmarine strata and bounding mélange and Songpan-Ganzi turbidite rock. b) Reverse fault that places GLS mélange rock (meta-carbonate unit) above nonmarine strata. c) Close up of reverse fault shown in Figure 4b. Picture taken perpendicular to fault strike looking down dip. d) Field photograph of Songpan-Ganzi turbidite rock located east of the bounding reverse fault zone of nonmarine strata. e) Close up view of bounding normal fault illustrating the drag folding of nonmarine strata in contact with deformed sub-vertical Songpan-Ganzi turbidite fault rock.

106

Figure 4.5. Conglomerate clast count from GLS nonmarine strata.

107

Figure 4.6. Detrital zircon geochronology results from GLS nonmarine strata. Histograms represent 50 Ma. Kernel density estimation curves calculated with a 15 bin size, normalized to area. Gray shaded areas represent corresponding age populations for multiple samples.

108

Figure 4.7. Weight mean average of the youngest detrital zircon population from GLS nonmarine strata.

109

176Yb+ 176/ E-Hf 176Lu)/ Volts 176Hf/ 176Lu/ E-Hf E-Hf Age Sample ± (1σ) 177Hf (0) 176Hf Hf 177Hf 177Hf (0) (T) (Ma) (T) ± (1σ) (%) 13JB015-271 14.00145414 4.6654 0.2828 3E-05 0.00107 0.282786 0.062 0.910649 0.828781 35.7 13JB028-187 13.54986653 5.18948 0.2827 3E-05 0.00116 0.28271 -2.62 0.907551 -1.764957 40.1 13JB015-31 12.25027973 2.98624 0.2827 3E-05 0.00093 0.282743 -1.47 1.222472 -0.559238 42.1 13JB015-141 23.13046296 3.86693 0.2824 3E-05 0.00152 0.282413 -13 1.026638 -10.61514 114.6 13JB028-132 11.79446973 3.76711 0.2819 3E-05 0.00077 0.281922 -30.4 1.040342 -25.79761 212.4 13JB015-215 26.12552481 4.47679 0.2824 2E-05 0.00152 0.282418 -12.8 0.831654 -8.253561 213.1 14JB28-182 7.492633715 5.54962 0.2821 2E-05 0.00044 0.282054 -25.8 0.711659 -20.74757 230.1 14JB28-272 9.345345016 3.41156 0.2822 2E-05 0.00067 0.282233 -19.4 0.869542 -14.39695 230.3 14JB28-303 24.56579613 3.54879 0.2824 3E-05 0.00162 0.282415 -12.7 1.208833 -5.962744 320 14JB28-313 26.42174531 3.95267 0.2829 3E-05 0.00163 0.282885 3.883 0.946418 10.70263 321.8 14JB28-186 13.44552318 2.98032 0.2824 3E-05 0.0011 0.282378 -14.1 1.187626 -4.42288 447.3 14JB28-289 9.899875447 5.92646 0.2823 2E-05 0.00078 0.282282 -17.6 0.645375 -7.777382 449.6 13JB015-163 9.667401696 2.95449 0.2823 2E-05 0.00062 0.282298 -17 0.79227 -7.176628 450.9 13JB028-235 13.46580491 3.41448 0.2823 2E-05 0.0009 0.28231 -16.5 0.85847 -6.601095 457.5 13JB028-153 15.93482285 4.0581 0.2822 3E-05 0.00098 0.282161 -21.6 1.044097 -5.24386 754 14JB28-197 30.27481015 3.85706 0.2825 2E-05 0.00205 0.282428 -11.5 0.875408 6.402761 850.2 14JB28-210 25.39268717 3.77199 0.2821 3E-05 0.00154 0.282046 -25.3 1.124556 -7.014249 856.1 13JB028-143 16.10435108 4.64524 0.2824 3E-05 0.00106 0.282399 -13 0.989493 5.810931 869.2 13JB015-30 19.59344608 4.55828 0.2818 3E-05 0.00126 0.281825 -33.1 1.113487 -11.56617 1001.2 13JB028-198 18.45587446 3.2466 0.2823 3E-05 0.00139 0.282314 -15.7 1.231099 5.905478 1007 13JB015-213 9.249365795 3.83429 0.282 3E-05 0.00054 0.282008 -27 0.898273 -0.525266 1200.8 14JB28-139 15.72056788 5.17015 0.2822 2E-05 0.00105 0.282162 -21.2 0.714882 5.04871 1205.7 13JB028-260 3.331805228 5.53864 0.2822 3E-05 0.00023 0.28217 -21.6 0.939363 6.167475 1243.2 14JB28-111 15.43650461 5.1019 0.282 4E-05 0.00111 0.281934 -29.1 1.252254 1.188687 1391.4 14JB28-47 9.377604395 3.61112 0.2819 2E-05 0.00062 0.281878 -31.5 0.826011 -0.342852 1411.4 13JB015-138 11.46843991 3.48684 0.2817 3E-05 0.0009 0.28166 -38.9 1.025661 -7.849849 1421.1 13JB028-128 18.64259093 5.66542 0.2819 3E-05 0.00114 0.281832 -32.6 0.928351 -1.534312 1431.7 14JB28-208 7.602746079 2.39151 0.2816 5E-05 0.00057 0.281615 -40.7 1.802913 0.258142 1843.8 14JB28-326 19.69058503 3.78001 0.2817 4E-05 0.00114 0.281664 -38.2 1.533897 2.070631 1847.3 13JB015-96 8.525900438 3.83615 0.2815 3E-05 0.00047 0.281513 -44.4 0.939432 -2.991594 1860.6 13JB028-131 6.191774734 5.22257 0.2816 3E-05 0.00046 0.281596 -41.5 0.950623 0.071624 1865.8 13JB028-321 6.458543382 4.19481 0.2813 3E-05 0.00044 0.28131 -51.4 1.075281 3.344645 2444.4 13JB015-313 7.492988714 4.60161 0.2812 2E-05 0.00049 0.281203 -55.1 0.845469 -0.145206 2457.4 13JB015-263 27.8741915 3.49621 0.2808 2E-05 0.00162 0.280755 -68.5 0.818338 -3.067601 3012.1 14JB28-12 7.467302466 4.98486 0.2811 4E-05 0.0005 0.281022 -61.3 1.443755 8.302857 3091.1 13JB028-329 10.63695003 5.23339 0.2808 3E-05 0.00071 0.280759 -70.1 1.019167 1.842318 3213.2 13JB015-66 11.45748783 3.89564 0.2806 3E-05 0.00073 0.280525 -78.2 0.961104 -2.040103 3401.1

Table 4.1. Hf isotope values for Ganzi-Litang suture nonmarine strata.

110

Figure 4.8. a) Histogram representation of detrital zircon geochronology from the west and east Ganzi basins [Jackson et al., 2017a], GLS, and Mula basin [Jackson et al., 2017b]. b) Cumulative distribution functions for the same data sets. Insert represents cumulative distribution functions for samples with Eocene detrital grains removed.

111 Based on sedimentological descriptions of conglomerate and structural/stratigraphic contacts, nonmarine strata in the GLS can be related to other nonmarine strata in the Yidun terrane [Jackson et al., 2017a; 2017b]. While nonmarine strata in the Yidun terrane are sedimentologically similar they exhibit Cenozoic [Jackson et al., 2017a] and Mesozoic [Jackson et al., 2017b] ages, therefore, the age of nonmarine strata in the GLS requires clarification.

Indicators of stratigraphic age such as diagnostic fossils, dateable volcanic ash layers or cross- cutting intrusive bodies are absent in GLS nonmarine strata; thus, we use detrital zircon geochronology to determine the age of deposition by calculating maximum deposition ages [e.g.,

Dickinson and Gehrels, 2003; 2009]. Based on the weighted mean average of 41.56 ± 0.91 Ma, the nonmarine strata in the GLS are Eocene in age.

Based on an evenly lithologic distribution of conglomerate clasts (i.e., Figure 4.5) we interpret recycling of local GLS and Triassic turbidite rock. Detrital zircon geochronology from previous studies [Jackson et al., 2017a; 2017b] show that nonmarine strata in the Yidun terrane are sourced from Triassic Yidun Group turbidite sequences and Triassic Yidun Arc plutons. The

Cenozoic Mula basin, located in southern Yidun terrane, also contains input from an Eocene age source [Jackson et al., 2017a]. Detrital zircon geochronology from the nonmarine strata in the

GLS show similar age populations to these previously studies (Figure 4.8). Thus, we interpret all zircon grains older than Late Triassic to represent populations recycled from the erosion of

Triassic Yidun Group turbidite rock. The Late Triassic zircon grains are sourced from the Yidun

Arc plutons and the Eocene population is most likely sourced from an Eocene plutonic body along the trace of the Jinsha and Ganzi-Litang sutures [e.g., Roger et al., 2000; Wang et al.,

2001]. When nonmarine strata from the GLS is compared to both Cretaceous and Eocene

112 nonmarine basins in the Yidun terrane, a correlation can be established between the Eocene Mula basin and GLS nonmarine strata (Figure 4.8b).

A minor zircon population at ~ 1,400 Ma is present in the GLS nonmarine results, which is used as a key provenance signature for interpreting the Zhongza Massif affinity as Kunlun terrane [Pullen et al., 2008; Ding et al., 2013; Jackson et al., 2017b]. Because of the significance of this population occurrence, we use Hf analysis to test the Kunlun affinity hypothesis. Hf values range from ~ 1 to -8 with an average of ~ -0.5. We interpret this value to indicate a predominantly crustal signature, similar to Hf analyses from the Kunlun terrane (2 to -6 with an average at ~ -1; Ding et al., 2013), supporting the idea that the Zhongza Massif was originally part of the southern Eurasia margin.

4.6.2. Tectonic Setting

One of the fundamental problems for field studies in the eastern Tibetan Plateau is determining the tectonic setting because of structural overprinting from multiple generations of deformation [Studnicki-Gizbert et al., 2008]. Because the left-lateral strike-slip Litang fault is located ~ 25 km north of the study area and the eastern bounding fault in the GLS demonstrates a reverse fault sense of shear, we explore the prevailing tectonic setting associated with depositional of nonmarine strata. The Litang fault is a NW-SE trending, left-lateral fault that developed during Miocene time (7-5 Ma) [Wang and Burchfiel, 2000; Zhang et al., 2015]. The development of the Litang fault corresponds temporally with other strike-slip faults in the eastern

Tibetan Plateau such as the Xianshuihe fault, which together act as a deformational system that extrudes crustal material southeastward [Tapponnier et al., 2001]. Thermochronology studies illustrate cooling in primarily in Miocene time for the region, which are interpreted to correspond to the onset of strike-slip deformation [Arne et al., 1997; Xu and Kemp, 2000; Kirby et al., 2002;

113 Godard et al., 2009]. However, minor cooling episodes are also documented in Eocene and

Cretaceous time [Reid et al., 2005b; Enkelmann et al., 2006; Wilson and Fowler, 2011].

On way to decipher between tectonic settings is the evaluation of fracture (Mode I) set orientations in a structural system [Engelder, 1985; 1987]. Mode I fractures develop as extensional (opening) features in the direction of least principal stress (σ3); thus, they trend parallel to the principal (σ1) stress [Engelder, 1987]. We interpret fractures in GLS nonmarine strata to represent Mode I fractures, associated with a compressional stress regime, in which σ1 horizontal stress is oriented ~ NE-SW, parallel to the most prominent fracture trend 020°-200°.

The occurrence of subhorizontal Miocene strata (e.g., Figure 4.3.) in the GLS can aid in deciphering the tectonic setting for the nonmarine strata. Miocene strata are in angular- unconformity contact with GLS mélange rock and most likely can be associated with the development of Miocene strike-slip faulting in the region [Burchfiel and Chen, 2012]. Because of the angular-unconformity relationship with Miocene strata, strike-perpendicular fracture orientations, and an Eocene maximum depositional age; we interpret GLS nonmarine strata to have been deposited syntectonically as the GLS was reactivated, in a compressional tectonic setting, during Eocene time.

4.7. Discussion

4.7.1. Tectonic Model

A comprehensive tectonic model for the Yidun terrane in the eastern Tibetan Plateau must include Late Triassic development of the GLS and subsequent post-Triassic modification along the GLS. Prior to the initial development of the GLS, turbidites were deposited, sourced from both the Zhongza Massif (Yidun Group turbidites) and the Yangtze block (Songpan-Ganzi turbidites), along the eastern Paleo-Tethys oceanic floor during Middle Triassic time [Weislogel

114 et al., 2010; Wang et al., 2013]. During Late Triassic time (ca. 215-225 Ma) westward subduction of the eastern Paleo-Tethys Ocean along the Zhongza Massif margin initiated, resulting in the development of the GLS and Yidun Arc plutons. The GLS mélange in Late

Triassic time would have been east-dipping and the margin characterized by forearc deformation.

Further northward migration of the Qiangtang-Zhongza Massif crustal blocks and the subsequent

Lhasa terrane amalgamation in Early-Middle Cretaceous time, resulted in the steepening and minor exhumation of the GLS. India’s collision with the southern margin of the Lhasa terrane at

55-60 Ma reactivated the GLS, further steepening the mélange, and trapping the nonmarine strata between reverse faults along the western and eastern flanks. The GLS did not experience strike- slip deformation in the Litang area until Miocene (Late Neogene) time, when regional left-lateral strike-slip fault systems (i.e., Xianshuihe and Litang) developed in the Yidun terrane, extruding and rotating crustal material to the southeast.

4.7.2 Broader Implications

Reactivation along pre-existing sutures in the eastern Tibetan Plateau has direct implications to plate-scale models pertaining to the development of high topography and thickened crust throughout the plateau. Tapponnier et al. [2001] suggest that the Mesozoic suture zones in the interior parts of the plateau represent lithospheric zones of weaknesses that focus deformation and deposition throughout the multiple phases of terrane collision along the southern margin of Eurasia. Furthermore, Tapponnier et al. [2001] predict that the timing of reactivation along the interior plateau Mesozoic sutures illustrate the spatial representation of high topography associated with plateau development. Clark and Royden [2000] suggest that the eastern Tibetan Plateau gained its present-day elevation by crustal thickening followed by

Miocene middle to lower crustal flow. This model invokes a ductile layer, decoupled from the

115 upper-crust, migrate (extrude) eastward and southeastward from the central portion of the

Tibetan Plateau. Reactivation of large-scale faults and sutures favors a rigid-block model, however, it is remains unclear how the upper-crust would respond (deform) after decupling of a middle-to-lower crustal event. Documenting reactivation along the GLS (this study), as well as deformation and depositional of nonmarine strata in Mesozoic [Jackson et al., 2017b] and

Cenozoic [Jackson et al., 2017a] time spatially associated with the GLS can best be incorporated into a rigid-block model.

4.8. Conclusions

Nonmarine strata in the Ganzi-Litang suture contain a record of deposition and deformation that documents the evolution of the suture. This study yields the following conclusions:

1. Fault-bounded nonmarine strata consisting of conglomerate interbedded with sandstone

and mudstone, deposited in an alluvial fan environment, are present along the western

and eastern flanks of the Ganzi-Litang suture south of Litang.

2. A maximum depositional age for the nonmarine strata of 41.56 ± 0.91 Ma was calculated

by a weighted mean average of the youngest detrital zircon age population, bracketing the

timing of reactivation along the Ganzi-Litang suture.

3. Provenance analyses show that nonmarine strata were sourced primarily from recycled

local Triassic turbidite and plutonic rock.

4. This study shows that the Ganzi-Litang suture was the locus of deformation and

deposition in the eastern Tibetan Plateau during the Eocene. The GLS was preferentially

reactivated because of pre-existing crustal weaknesses in response to far-field stresses

applied by the initial stages of the India-Asia collision.

116 Acknowledgments

This work was supported by U.S. National Science Foundation grants EAR-1119266

(Robinson) and EAR-1119219 (Weislogel). The University of Alabama Graduate School and

Department of Geological Sciences provided travel support. The authors wish to thank

Chunmiao Zheng (Peking University) for assistance with field permits. Detrital zircon analyses were conducted at the University of Arizona’s LaserChron Center

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121

CHAPTER 5:

CONCLUSIONS

This dissertation contributes necessary data pertaining to Cretaceous and Eocene nonmarine stratigraphic successions in the Yidun terrane to elucidate the tectonic evolution of the Tibetan Plateau. This chapter summarizes the major conclusions of this dissertation, highlights the differences and similarities of Cretaceous and Eocene nonmarine strata in the

Yidun terrane, and places interpretations into a regional tectonic perspective.

Chapter 2 presents data from the Mula basin, located in the southern Yidun terrane. The

Mula basin contains ~ 1,050 m of nonmarine strata in three stratigraphic units based on alluvial fan and fluvial depositional environments. Structural observations show that the Mula basin developed in a compressional tectonic setting. Detrital zircon geochronology illustrate an Eocene stratigraphic maximum depositional age. Sedimentary provenance analyses indicate that Mula basin strata were sourced locally from predominantly Triassic Yidun Group turbidite and Late

Triassic Daocheng Pluton rock. The Mula basin is interpreted to have developed in Eocene time during upper-crustal shortening near the Ganzi-Litang suture, which delineates the eastern boundary of the Yidun terrane.

Chapter 3 presents data from the west and east Ganzi basins in the northern Yidun terrane. The west and east Ganzi basins contain ~ 800 m and ~1600-1830 m of nonmarine strata, respectively. Strata from both basins separate into three stratigraphic units, based on alluvial fan and fluvial depositional environment interpretations. Structural observations show that the west and east Ganzi basins developed in a compressive tectonic setting. Detrital zircon geochronology

122 and previously reported palynology data illustrate a Cretaceous stratigraphic age for both basins.

Thin section petrology, conglomerate clast counts, and detrital zircon geochronology analyses indicate that nonmarine strata from the west and east Ganzi basins were sourced regionally from

Triassic Yidun Group turbidite and Late Triassic Yidun Arc rock, associated with large drainage networks from the southern Yidun terrane and the southeastern depocenter of the Songpan-Ganzi terrane. The west and east Ganzi basins are interpreted to have developed in Cretaceous time during development of a fold-thrust belt along the eastern portion of the Yidun terrane.

Similarities between the Eocene Mula basin and the Cretaceous Ganzi basins include the color of nonmarine strata (red and maroon), basin thicknesses (~ 1-1.6 km), the presence of a basal alluvial fan conglomerate unit, dominant Late Triassic detrital zircon age populations, and pre-Triassic detrital zircon geochronology ages. The Late Triassic detrital zircon populations are interpreted to represent a Yidun Arc source, while the pre-Triassic populations present in the data indicate a Yidun Group turbidite rock source.

However, the Mula basin has an Eocene age, and the Ganzi basins have a Cretaceous age.

The upper stratigraphic architecture differs in that the Ganzi basins show a slight coarsening in the uppermost unit, while the Mula basin shows an overall fining upwards sequence. The Ganzi basins also contains growth strata in the footwall of the basin bounding faults, a structure- sedimentological relationship absent in the Mula basin. Structurally the Ganzi basins contain intra-basin folds that strike parallel to the basin-bounding faults, while the Mula basin contains little to no evidence of folding.

Chapter 4 presents data from nonmarine strata in the Ganzi-Litang suture, approximately

25 km south of the city Litang, in the southwestern part of Sichuan Province. Nonmarine strata are interpreted to represent alluvial fan deposits consisting of conglomerate with minor intrabeds

123 of sandstone and mudstone. Structural observations demonstrate that nonmarine strata are fault- bound along the western and eastern flanks of the suture. Sedimentary provenance analyses indicate that nonmarine strata were sourced locally from Triassic turbidite and pluton rock, similar to the Mula basin sediment source. A weighted mean average of the youngest detrital zircon population suggests an Eocene age for the nonmarine strata; thereby bracketing reactivation along the Ganzi-Litang suture.

Integration of the findings of this dissertation provides insights into the regional tectonic history of East Tibet. This dissertation documents Cretaceous and Eocene upper-crustal shortening and nonmarine deposition in the eastern part of the Yidun terrane. Previously reported thermochronology show that East Tibet underwent episodic phases of crustal deformation, inferred by cooling signatures, in Late Triassic-Early Jurassic, Late Cretaceous, Eocene, and

Miocene time [Kirby et al., 2002; Clark et al., 2005a; Reid et al., 2005; Wilson and Fowler,

2011; Wang et al., 2012]. The chemistry and age of plutons in the Yidun terrane also suggest that continental subduction and crustal thickening were the key processes occurring during

Cretaceous and Eocene time [Roger et al., 2000; Reid et al., 2007; Wang et al., 2008]. Previous studies [e.g., Royden et al., 2008 and references therein] show that strike-slip faulting initiated in

Eocene time throughout the central and eastern portions of the plateau. Using the maximum depositional age of 45.51 ± 0.49 Ma for the Mula basin, this dissertation quantifies that compressive deformation persisted in the Yidun terrane until this time. Thus, strike-slip deformation in East Tibet must have initiated after ~ 45 Ma.

Deformation in the Yidun terrane during Cretaceous and Eocene time is spatially related with the Late Triassic Ganzi-Litang suture. While the Ganzi-Litang suture originally developed in Late Triassic time, this dissertation shows that the suture has been the locus of reactivation in

124 Mesozoic and Cenozoic time. Therefore, the Ganzi-Litang suture acted as a lithospheric zone of weakness that preferentially accommodated strain during subsequent deformational phases, presumably associated with the Lhasa-Qiangtang and India-Asia collisions. Compressional fold- thrust belt deformation and deposition associated with reactivation along a Mesozoic suture suggest that East Tibet developed similar to the processes described by Tapponnier et al. [2001], in which rigid lithospheric blocks systematically deform and extrude eastward as outgrowth of the plateau evolves.

Based on stratigraphic similarities and fossil assemblages, Zhang et al. [1994] propose a

South China block (Yangtze) affinity. In contrast, Ding et al. [2013] suggest a North China block

(Kunlun) affinity for the Zhongza Massif based on a ~ 1,400 Ma detrital zircon population in the

Triassic Yidun Group signature, a population absent in South China block data sets [Druschke et al., 2006; Weislogel et al., 2010]. Detrital zircon geochronology from this dissertation show that nonmarine strata in the Yidun terrane are second generation recycled sediment from the Zhongza

Massif and contain a statistically significant number of ~ 1,400 Ma grains. This further substantiates the interpretation of a Kunlun affinity for the Zhongza Massif and helps demonstrate that the eastern branch of the Paleo-Tethys Ocean evolved in Triassic time as a

Mediterranean style oceanic spreading center [e.g., Pullen et al., 2008].

125 References

Clark, M. K., M. A. House, L. H. Royden, K. X. Whipple, B. C. Burchfiel, X. Zhang, and W. Tang (2005a), Late Cenozoic uplift of southeastern Tibet, Geology, 33(6), 525-528. Clark, M. K., J. W. M. Bush, and L. H. Royden (2005b), Dynamic topography produced by lower crustal flow against rheological strength heterogeneities bordering the Tibetan Plateau, Geophys. J. Int., 162, 575-590. Ding, L., D. Yang, F. L. Cai, A. Pullen, P. Kapp, G. E. Gehrels, L. Y. Zhang, Q. H. Zhang, Q. Z. Lai, Y. H. Yue, and R. D. Shi (2013), Provenance Analysis of the Mesozoic Hoh-Xil- Songpan-Ganzi Turbidites in Northern Tibet: Implications for the Tectonic Evolution of the Eastern Paleo-Tethys Ocean, Tectonics, 32(1), 34–48. Druschke, P., A. D. Hanson, Q. Yan, Z. Wang, and T. Wang (2006), Stratigraphic and U-Pb SHRIMP detrital zircon evidence for a Neoproterozoic continental arc, central China; Rodinia implications, J. Geol., 14, 627–636. Kirby, E., P. W. Reiners, M. A. Krol, K. X. Whipple, K. V. Hodges, K. A. Farley, W. Tang, and Z. Chen (2002), Late Cenozoic evolution of the eastern margin of the Tibetan Plateau: Inferences from 40Ar/39Ar and (U-Th)/He thermochronology, Tectonics, 21, 1-20. Pullen, A., P. Kapp, G. E. Gehrels, J. D. Vervoort, and L. Ding (2008), Triassic Continental Subduction in Central Tibet and Mediterranean-Style Closure of the Paleo-Tethys Ocean, Geology, 36(5), 351-354. Reid, A. J., C. J. L. Wilson, D. Phillips, and S. Liu (2005), Mesozoic Cooling across the Yidun Arc, Central-Eastern Tibetan Plateau: A Reconnaissance 40Ar/39Ar Study, Tectonophysics, 398(1/2), 45-66. Reid, A. J., C. J. L. Wilson, S. Liu, N. Pearson, and E. Belousova (2007), Mesozoic Plutons of the Yidun Arc, SW China: U/Pb Geochronology and Hf Isotopic Signature, Ore Geol. Rev., 31, 88-106. Roger, F., P. Tapponnier, N. Arnaud, U. Scharer, M. Brunel, X. Zhiqin, and Y. Jingsui (2000), An Eocene magmatic belt across central Tibet: mantle subduction triggered by the Indian collision?, Terra Nova, 12, 102-108. Royden, L. H., B. C. Burchfiel, and R. D. van der Hilst (2008), The geological evolution of the Tibetan Plateau, Science, 321, 1054-1058. Tapponnier, P., X. Zhiqin, F. Roger, B. Meyer, N. Arnaud, G. Wittlinger, and Y. Jingsui (2001), Oblique stepwise rise and growth of the Tibet Plateau, Science, 294, 1671-1677. Wang, E. E. Kirby, K. P. Furlong, M. van Soest, G. Xu, X. Shi, P. J. J. Kamp, and K. V. Hodges (2012), Two-phase growth of high topography in eastern Tibet during the Cenozoic, Nature Geoscience, 5(9), 640-645. Wang, Q., et al. (2008), Eocene melting of subducting continental crust and early uplifting of central Tibet: Evidence from central-western Qiangtang high-K calc-alkaline andesites, dacites and rhyolites, Earth Planet. Sci. Lett., 272(1–2), 158–171.

126 Weislogel, A. L., S. A. Graham, E. Z. Chang, J. L. Wooden, and G.E. Gehrels (2010), Detrital Zircon Provenance from Three Turbidite Depocenters of the Middle-Upper Triassic Songpan-Ganzi Complex, Central China: Record of Collisional Tectonics, Erosional Exhumation, and Sediment Production, Geol. Soc. Am. Bull., 122(11/12), 2041–2062. Wilson, C. J. L., and A. P. Fowler (2011), Denudational response to surface uplift in east Tibet: Evidence from apatite fission-track thermochronology, Geol. Soc. Am. Bull., 123(9/10), 1966-1987. Zhang, Q., D. Zhou, D. Zhao, Z. Huang, S. Han, X. Jia, and J. Dong (1994), Ophiolites of the Hengduan Mountains, China; characteristics and tectonic settings, in Gondwana Dispersion and Asian Accretion, edited by I. Metcalfe, pp. 335–344, Pergamon, Oxford, UK.

127

APPENDIX I Field Measurements

128 Station Latitude Longitude Sample Measurement Type Strike/ Trend Dip/ Plunge west ganzi basin 3 31.845267 99.262967 fault 307 58 bedding 40 15 slickenlines 322 0 imbrication 348 43 4 31.846683 99.263633 5 31.8565 99.270717 6 31.838933 99.239317 7 31.8393 99.237933 bedding 251 51 clevage 73 45 8 31.839067 99.2385 bedding 249 58 9 31.838883 99.238917 fabric 237 39 10 31.837933 99.239317 13WJ-ET-001 bedding 280 87 clevage 226 60 fault 140 74 fold axis 320 15 11 31.8274 99.243283 bedding 198 4 clevage 99 81 322 82 12 31.82685 99.243233 fabric 130 83 bedding 235 7 13 31.842867 99.238417 bedding 263 43 84 31.838583 99.239567 85 31.83855 99.238767 bedding 253 54 86 31.8148 99.258433 fracture 200 31 201 31 200 30 200 31 201 31 200 25 201 30 202 31 199 28 203 31 87 31.8148 99.258433 bedding 316 53 fault 235 0 88 31.816567 99.260633 bedding 313 48 89 31.817017 99.261133 bedding 326 52 fracture 91 60 90 62 85 55 92 61 90 60 92 65 94 59 91 62 92 60 88 59 90 57 89 61 bedding 215 39 90 31.7231 99.3199 bedding 3 35 bedding 358 43 91 31.725083 99.31645 fault 190 90

129 Station Latitude Longitude Sample Measurement Type Strike/ Trend Dip/ Plunge 92 31.726817 99.3133 93 31.7305 99.305133 94 31.7331 99.30075 bedding 4 73 joint 97 54 bedding 11 61 fracture 286 55 281 57 276 61 286 55 280 64 301 50 288 59 95 31.740433 99.290767 bedding 5 12 96 31.744667 99.285683 X-bedding 11 55 bedding 258 88 159 40 97 31.749017 99.279917 98 31.767583 99.261983 fault 171 99 31.755117 99.268433 bedding (remote) 46 21 100 31.734583 99.303 101 31.735217 99.303217 102 31.73875 99.302017 103 31.7409 99.301267 104 31.738117 99.296333 bedding 165 53 fracture 65 79 45 75 bedding 171 61 105 31.74165 99.289833 106 31.750933 99.2766 bedding (remote) 334 16 107 31.755467 99.26805 108 31.768667 99.261717 bedding (remote) 320 15 109 31.771567 99.259133 110 31.789883 99.2627 bedding 9 12 fracture 115 90 135 82 120 88 116 89 124 76 110 85 125 85 124 80 104 85 294 81 105 90 130 86 102 90 69 85 124 88 121 87 101 89 116 90 99 88 130 89 111 31.79515 99.264067 bedding 3 20

130 Station Latitude Longitude Sample Measurement Type Strike/ Trend Dip/ Plunge fracture 98 88 100 88 110 89 100 90 251 83 249 85 105 89 102 90 245 88 112 "erosional" fracture 270 90 255 88 268 90 273 90 271 90 271 90 268 89 West Ganzi Basin 219 220 31.72414 99.3076 fracture 209 76 221 31.72275 99.30698 bedding 285 56 bedding 207 73 222 223 31.7216 99.30679 bedding 194 62 fracture 236 71 181 41 224 31.7215 99.30683 225 31.72112 99.30699 bedding 52 65 226 bedding 25 58 227 228 contact 233 229 14WG13 230 31.71834 99.30605 14WG14a, b. c bedding 75 73 bedding (remote) 115 60 231 31.71939 99.30584 14WG15 bedding 50 85 East Ganzi Basin 189 31.57939 99.70792 190 191 31.55715 99.67128 bedding 175 13 fracture 260 76 330 89 338 79 264 84 254 80 336 85 329 88 251 89 229 14 230 10 226 9 241 10 241 11 111 14 106 19 110 28

131 Station Latitude Longitude Sample Measurement Type Strike/ Trend Dip/ Plunge 119 15 104 22 x-bedding 50 9 192 31.55671 99.67129 bedding 139 22 193 bedding 114 22 fracture 255 81 257 73 254 83 260 84 256 78 194 31.55335 99.67103 bedding 175 19 195 196 197 31.55193 99.66821 bedding 132 19 fracture 304 59 307 57 284 65 288 68 283 60 195 84 189 90 188 74 194 76 180 78 159 45 156 50 160 41 149 39 147 45 50 29 70 15 61 17 65 18 54 14 198 31.55242 99.66621 bedding 179 13 199 31.55149 99.66271 bedding 40 28 200 31.55157 99.66032 201 31.55147 99.65945 202 31.55018 99.65785 203 31.55102 99.65588 204 31.54743 99.65145 bedding 0 32 205 31.54732 99.65224 206 fold axis 131 207 31.54701 99.65488 208 bedding 17 21 209 210 31.54729 99.66341 bedding 248 23 211 31.54776 99.66496 212 31.54763 99.66803 213 31.54748 99.66901 bedding 126 20 fracture 26 29 19 29 27 22 16 37

132 Station Latitude Longitude Sample Measurement Type Strike/ Trend Dip/ Plunge 27 34 265 22 255 19 250 20 271 29 255 16 214 31.5468 99.67103 bedding 81 15 232 31.53863 99.64725 14EG16 bedding 165 21 14EG17 190 34 153 22 319 39 106 53 220 38 332 37 326 29 fault 231 57 233 31.54023 99.64677 contact 305 32 bedding 315 36 234 31.54228 99.64642 235 31.54365 99.64646 bedding 301 10 236 31.54277 99.64642 237 31.53917 99.64728 238 31.53174 99.64974 bedding 351 21 fracture 224 74 220 75 230 70 225 78 221 75 222 72 232 76 225 75 224 70 220 72 216 74 239 31.53175 99.65187 240 31.53112 99.65121 bedding 121 70 101 68 241 31.53004 99.65281 bedding 337 73 242 31.47776 99.72028 bedding 314 79 243 31.47809 99.72165 bedding 119 15 244 31.47842 99.72277 bedding 151 69 245 31.4791 99.72327 bedding 141 75 246 31.48019 99.72449 bedding 324 78 247 31.48124 99.72639 bedding 334 79 248 31.48266 99.72736 bedding 304 90 249 31.48317 99.72816 bedding 336 89 250 31.48417 99.72975 contact 305 251 31.48426 99.73107 bedding (remote) 287 14 252 31.48544 99.73335 bedding 315 25 253 31.48786 99.73485 bedding 302 20 254 31.48506 99.72844 fault 318 bedding 320 20 271 64 255 31.5462 99.67414 bedding 121 31

133 Station Latitude Longitude Sample Measurement Type Strike/ Trend Dip/ Plunge 256 31.5468 99.67426 bedding 123 17 257 31.54768 99.67523 bedding 125 15 258 31.5479 99.67549 bedding 111 20 fold axis 165 20 189 22 194 21 259 31.54743 99.67619 260 31.54899 99.67783 bedding 30 20 fracture 145 46 113 87 295 74 103 82 340 41 98 79 101 80 274 66 271 73 276 65 272 74 111 63 97 71 135 32 154 61 155 58 141 68 275 79 319 64 296 81 261 31.55067 99.68681 bedding 75 20 fracture 271 69 101 88 275 65 272 67 278 65 280 69 274 66 273 72 262 31.55016 99.68746 bedding 87 19 fracture 273 79 275 81 276 78 268 75 282 80 274 78 270 75 271 80 277 77 280 78 273 78 263 31.54936 99.68804 bedding 25 22 264 31.54857 99.68794 bedding 29 15 265 31.54755 99.68802 266 31.54615 99.68943 267 31.54384 99.68919 bedding 312 24

134 Station Latitude Longitude Sample Measurement Type Strike/ Trend Dip/ Plunge 268 31.54267 99.68832 bedding 14 17 269 31.53757 99.68904 bedding 296 17 fracture 37 74 26 83 40 76 34 64 35 71 19 64 23 59 53 70 47 67 35 88 56 44 bedding 355 25 270 31.53598 99.68642 271 31.54086 99.67772 bedding 280 31 272 31.54194 99.67538 bedding 70 34 273 31.54464 99.67103 bedding 76 14 GLS 15 29.77025 100.39183 bedding 303 54 17 29.720683 100.51938 bedding 215 74 113 29.770217 100.39193 bedding 281 62 114 29.772017 100.39057 bedding 202 19 115 29.772167 100.39348 bedding 213 50 fold limb 191 54 fold limb 259 67 116 29.77255 100.39227 117 29.783517 100.4101 118 29.7485 100.40935 bedding 325 90 119 29.750683 100.4057 120 29.7699 100.39405 contact 305 27 61 24 121 29.749283 100.40623 122 29.713583 100.39012 123 29.7475 100.40843 124 29.7514 100.37622 125 29.745817 100.36952 126 29.746717 100.3695 127 29.7468 100.36985 bedding 165 85 128 29.751083 100.37558 129 29.75145 100.37615 bedding 161 84 130 29.753133 100.37828 131 29.7487 100.40197 132 29.824233 100.34638 bedding 243 66 133 29.703133 100.38237 bedding 241 70 fracture 350 54 fracture 349 54 fracture 350 52 fracture 349 50 134 29.704833 100.37973 bedding 60 90 135 29.7123 100.34193 bedding 293 60 136 29.6575 100.35963 137 29.64415 100.3528 bedding (spg) 110 25 bedding (YA) 143 75

135 Station Latitude Longitude Sample Measurement Type Strike/ Trend Dip/ Plunge 138 29.648183 100.45683 139 29.6486 100.45783 140 29.6501 100.45848 141 29.650233 100.45822 142 29.74805 100.4142 fold hinge 196 51 278 29.77151 100.39402 bedding (rb) 81 54 bedding (rb) 71 86 bedding (spg) 184 27 bedding (rb) 271 78 bedding (spg) 71 75 Fault 68 279 29.77174 100.39102 fracture 199 80 fracture 209 87 fracture 21 72 fracture 25 76 slickenlines 199 14 280 29.77122 100.39073 fracture 179 69 fracture 34 72 fracture 195 85 fracture 179 69 fracture 35 70 281 29.77166 100.38943 bedding 73 73 imbrication 59 65 imbrication 64 75 imbrication 45 66 imbrication 53 73 imbrication 40 70 imbrication 68 84 imbrication 94 88 imbrication 40 71 imbrication 75 90 imbrication 63 82 282 29.77197 100.3888 fault 217 70 slickenlines 217 16 fracture 190 78 fracture 314 62 fracture 196 88 fracture 209 81 fracture 35 66 fracture 222 75 283 29.77161 100.3885 bedding 76 80 bedding 120 53 fracture 151 84 fracture 242 83 fracture 229 58 fracture 218 88 fracture 56 81 fracture 342 65 fracture 341 77 fracture 277 57 fracture 325 64 fracture 8 81 fracture 236 60 fracture 290 87

136 Station Latitude Longitude Sample Measurement Type Strike/ Trend Dip/ Plunge fracture 224 61 fracture 230 86 284 29.77007 100.3917 fracture 123 64 fracture 341 67 fracture 11 77 fracture 269 45 fracture 320 74 fracture 8 85 fracture 37 78 fracture 5 80 fracture 148 38 fracture 300 69 fracture 192 68 fracture 161 70 fracture 284 88 fracture 349 79 fracture 111 83 fracture 37 86 fracture 271 73 fracture 171 79 fracture 225 77 fracture 4 80 fracture 93 66 fracture 11 82 fracture 226 75 fracture 99 84 fracture 281 76 fracture 215 88 fracture 211 78 285 29.74905 100.39915 286 29.76342 100.35945 bedding 216 61 287 29.76304 100.35785 bedding 317 86 288 29.76339 100.35438 bedding 179 84 289 29.76384 100.35451 290 29.76426 100.35391 291 29.76062 100.35361 bedding 141 67 fracture 89 55 fracture 19 56 fracture 22 75 fracture 236 89 fracture 229 78 fracture 30 63 fracture 20 90 fracture 51 65 fracture 40 53 fracture 41 73 fracture 45 76 fracture 225 86 fracture 47 68 292 29.76134 100.35402 contact 163 293 29.76109 100.35446 294 29.76088 100.35445 295 29.75962 100.35513 bedding 158 63 bedding 150 87

137 Station Latitude Longitude Sample Measurement Type Strike/ Trend Dip/ Plunge imbrication 174 81 181 80 165 89 171 63 183 76 167 84 160 85 165 86 169 81 180 86 296 29.75957 100.35353 mula 19 29.122767 100.59745 bedding 297 21 x-bedding 305 25 20 29.122933 100.5978 21 29.0868 100.60697 bedding 333 35 22 29.082317 100.60635 bedding RB 326 39 bedding SPG 61 70 23 29.08135 100.60538 bedding 75 86 24 29.05165 100.6111 143 29.362833 100.45577 contact 275 bedding rb 359 20 144 29.360867 100.45892 bedding 352 39 145 29.365933 100.46307 146 29.082167 100.6064 contact 324 48 bedding-spg 76 64 bedding - rb 304 32 imbrication 181 imbrication 191 imbrication 193 imbrication 188 147 29.16565 100.59412 contact 315 contact 355 bedding - spg 351 24 148 29.1637 100.5943 bedding 349 25

149 29.154817 100.5927 bedding 3 31 paleoflow 106 paleoflow 127 paleoflow 131 150 29.155083 100.58143 fold - bedding 1 348 27 fold - bedding 2 166 79

151 29.15055 100.57395 152 29.151767 100.57535 153 29.07835 100.60623 bedding 71 88 154 29.046017 100.6529 bedding 305 16 bedding 304 26 155 0 0 bedding 320 31

138 Station Latitude Longitude Sample Measurement Type Strike/ Trend Dip/ Plunge 156 29.042967 100.64758 bedding 316 22 157 29.0405 100.64585 158 29.039533 100.6447 bedding 311 20 paleoflow 75 paleoflow 105 paleoflow 90 paleoflow 76 paleoflow 56 159 29.034 100.63985 paleoflow 105 paleoflow 147 paleoflow 81 paleoflow 173 paleoflow 198 paleoflow 177 paleoflow 228 paleoflow 215 paleoflow 73 paleoflow 68 160 29.032817 100.63873 bedding - spg 87 76 161 29.046 100.66203 bedding 274 36 162 29.058 100.6835 bedding 319 21 fold bedding 1 324 20 fold bedding 2 146 79 163 29.107433 100.63695 164 29.109317 100.63948 165 29.1051 100.63403 bedding 135 37 bedding 345 82 166 29.101267 100.63 contact 304 167 29.100567 100.63 bedding 256 34 bedding 220 21 168 29.096667 100.62807 169 29.094233 100.62827 170 29.091817 100.6278 bedding 230 19 bedding 130 11 171 29.084283 100.62913 bedding 244 21 172 0 0 bedding 339 24 173 29.069133 100.63225 174 29.0677 100.63177 bedding 354 33

175 29.062267 100.61927 bedding 320 23 176 29.061317 100.61787 bedding 302 31 paleoflow 124 111 74 102 105 103 131 115 122 108 65 101 fault 125 9

139 Station Latitude Longitude Sample Measurement Type Strike/ Trend Dip/ Plunge 177 29.059767 100.61558 contact 320 bedding - spg 79 7 slickenlines - spg 225 3 178 29.181233 100.54917 179 29.219717 100.54073 180 29.220417 100.54073 bedding 351 18

181 29.2152 100.53827 contact 330 182 29.135967 100.5961 183 29.335633 100.44155 bedding 295 30

140 Clast counts from Ganzi basins

west Ganzi basin east Ganzi basin Clast type CC-A CC-B CC-C CC-D CC-E CC-F CC-G CC-H CC-I Total Red Sandstone 11 56 19 0 0 0 0 26 14 126 Red siltstone 0 0 14 0 7 12 0 11 0 44 White Sandstone 18 4 14 4 3 23 4 23 0 93 Lithic Sandstone 19 0 3 0 14 21 6 0 0 63 Gray Shale 44 36 31 25 42 23 4 36 26 267 Phyllite 0 0 0 0 0 0 17 0 0 17 Quartzite 6 6 3 52 39 5 29 6 0 146 Granite 0 11 4 17 12 0 0 1 9 54 Quartz (vein) 2 0 9 0 4 0 14 6 1 36 Total 100 113 97 98 121 84 74 109 50 total number of clast (n=846) Clast counts from Ganzi-Litang suture

western flank eastern flank Clast type CC-A CC-B CC-C CC-D CC-E CC-F CC-G Total Sandstone 25 0 43 1 11 14 20 114 Shale/slate 14 53 29 5 2 10 15 128 Phyllite 0 0 0 0 1 1 5 7 Quartzite 29 28 24 18 11 5 2 117 Peridotite 0 0 0 41 29 0 0 70 Carbonate 5 0 0 6 22 0 0 33 Granite 27 15 3 23 19 10 5 102 Quartz (vien) 1 6 2 6 5 5 14 39 Total 101 102 101 100 100 45 61 total number of clast (n=610)

141

APPENDIX II Detrital Zircon Geochronology

142 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB035 13MB035-187 475.65 14584.5 1.261 20.510469 5.81 0.0441299 7.35 0.0065646 4.5 42.17974 1.892 43.84821 3.155 136.09314 136.72 42.1797 1.8919 13MB035-286 1438 11971.59 2.449 21.860667 2.68 0.0466201 3.78 0.0073916 2.66 47.47378 1.257 46.267008 1.708 15.820348 64.89 47.4738 1.2571 13MB035-9 936.88 21261.89 1.124 16.700897 2.74 0.2533536 3.71 0.0306878 2.51 194.85149 4.814 229.2967 7.619 599.1366 59.267 194.851 4.8144 13MB035-175 1315.7 25362.51 1.628 13.441873 5.45 0.3166179 6.57 0.030867 3.67 195.97208 7.089 279.29763 16.04 1052.2059 109.84 195.972 7.0891 13MB035-163 664.7 144414 2.131 16.404759 2.09 0.2625837 3.07 0.0312418 2.26 198.31572 4.407 236.74688 6.49 637.77101 44.873 198.316 4.4066 13MB035-170 1309.2 26094.4 0.781 14.263405 5.47 0.3032152 5.93 0.031367 2.3 199.09815 4.507 268.9084 14.02 931.58073 112.31 199.098 4.5075 13MB035-68 1422.5 36163.55 1.637 16.255585 2.32 0.2667721 3.56 0.0314515 2.7 199.62649 5.303 240.10967 7.604 657.39246 49.683 199.626 5.303 13MB035-73 782.48 49127.68 1.408 19.40576 2.13 0.2236799 2.88 0.0314816 1.93 199.81426 3.798 204.96792 5.336 264.66143 48.918 199.814 3.7984 13MB035-246 432.16 52333.96 2.853 18.920146 2.52 0.2315891 3.84 0.0317791 2.9 201.67332 5.749 211.50966 7.323 322.54373 57.126 201.673 5.7486 13MB035-159 2007.6 22257.19 1.142 11.830685 2.5 0.3759631 3.84 0.0322592 2.91 204.67246 5.865 324.06348 10.65 1304.669 48.572 204.672 5.8648 13MB035-46 894.3 35210.76 1.963 18.069608 3.48 0.2463486 4.63 0.0322848 3.05 204.83195 6.148 223.60577 9.294 426.02641 77.733 204.832 6.1481 13MB035-58 1125.8 35167.31 1.658 15.773848 2.92 0.2827478 4.36 0.0323471 3.24 205.22135 6.547 252.83492 9.758 721.52457 61.881 205.221 6.5468 13MB035-15 664.56 152335.5 1.67 19.753234 1.99 0.2269457 3.89 0.0325131 3.35 206.258 6.792 207.67418 7.313 223.75174 46.038 206.258 6.7921 13MB035-299 657.35 31205.5 2.407 20.112133 2.1 0.222932 3.46 0.0325184 2.75 206.29091 5.579 204.34714 6.401 181.95927 48.9 206.291 5.5789 13MB035-79 982.59 40341.85 1.439 19.624439 1.83 0.2290235 3.05 0.0325969 2.44 206.78081 4.969 209.39226 5.777 238.85794 42.266 206.781 4.9694 13MB035-208 496.24 44125.21 2.561 19.436582 1.95 0.2317927 3.45 0.0326752 2.84 207.26981 5.8 211.67752 6.588 260.99524 44.788 207.27 5.8003 13MB035-103 1597.3 36526.47 1.822 17.604674 2.61 0.2563938 4.09 0.0327366 3.15 207.65329 6.441 231.75665 8.476 483.91771 57.586 207.653 6.4408 13MB035-64 563.47 43490.15 2.954 19.6412 1.85 0.2299757 3.79 0.0327604 3.31 207.80129 6.765 210.17859 7.198 236.92335 42.735 207.801 6.7647 13MB035-275 739.08 206306.9 2.387 19.619059 2.18 0.2307068 3.12 0.0328275 2.23 208.2201 4.57 210.78195 5.934 239.49496 50.247 208.22 4.5702 13MB035-304 798.69 48571.47 2.075 19.332707 2.34 0.2341366 3.84 0.0328292 3.04 208.23118 6.231 213.60776 7.397 273.28652 53.728 208.231 6.2308 13MB035-179 363.82 31533.13 2.023 19.590914 2.78 0.2312376 5.38 0.0328558 4.6 208.39694 9.438 211.21983 10.25 242.79902 64.099 208.397 9.4378 13MB035-155 704.8 181616.9 2.667 19.559393 1.67 0.231944 3.4 0.0329031 2.96 208.69243 6.078 211.80222 6.499 246.50701 38.506 208.692 6.0782 13MB035-291 826.45 29178.18 4.35 19.353083 2.05 0.2345849 2.73 0.0329268 1.81 208.83985 3.721 213.97654 5.274 270.87192 46.937 208.84 3.7207 13MB035-264 474.76 49769.96 3.018 19.880697 1.82 0.228387 5.13 0.0329308 4.8 208.86483 9.871 208.86625 9.693 208.89223 42.093 208.865 9.8705 13MB035-282 525.12 33239.01 3.63 19.994747 1.91 0.2272629 4.07 0.0329567 3.59 209.02653 7.389 207.93668 7.654 195.62534 44.473 209.027 7.3886 13MB035-305 465.95 38856.38 3.833 19.927307 1.76 0.2281342 3.58 0.0329714 3.12 209.11868 6.413 208.6573 6.756 203.4491 40.966 209.119 6.4134 13MB035-19 755.2 41127.33 1.527 13.738406 10.2 0.331104 10.9 0.0329913 3.67 209.24269 7.556 290.40835 27.46 1008.055 208.05 209.243 7.5564 13MB035-283 238.55 44113.03 2.751 20.048721 2.81 0.2271308 3.71 0.0330264 2.43 209.4618 5 207.82735 6.979 189.31176 65.452 209.462 5 13MB035-53 660.08 32003.46 2 19.892283 2.45 0.2294659 4.74 0.0331056 4.05 209.95595 8.374 209.75769 8.974 207.51829 56.741 209.956 8.3739 13MB035-143 637.45 47216.61 2.667 19.223232 2.49 0.2374555 3.38 0.033106 2.28 209.95872 4.714 216.33473 6.587 286.32099 57.046 209.959 4.7143 13MB035-45 498.66 46950.15 1.429 20.489751 2.43 0.2228025 4.65 0.0331097 3.97 209.98161 8.196 204.23959 8.607 138.48217 57.084 209.982 8.1962 13MB035-203 632.56 161980.5 2.508 18.922596 2.73 0.2413639 6.12 0.0331247 5.48 210.07501 11.32 219.53668 12.08 322.25014 62.048 210.075 11.318 13MB035-44 886.44 29029.58 1.613 19.271002 2.14 0.2372685 3.29 0.0331622 2.5 210.30899 5.167 216.1813 6.409 280.65105 49.074 210.309 5.1675 13MB035-26 184.34 80669.71 1.895 20.12867 2.89 0.2273907 4.4 0.0331961 3.32 210.5203 6.88 208.04235 8.286 180.04453 67.442 210.52 6.88 13MB035-42 956.09 41198.18 2.223 17.626468 1.99 0.2596762 4.52 0.0331968 4.06 210.52493 8.402 234.40594 9.461 481.14302 44.043 210.525 8.4024 13MB035-8 879.27 51832.54 2.358 19.974813 2.01 0.2292305 3.21 0.0332088 2.51 210.60013 5.194 209.56322 6.08 197.93228 46.622 210.6 5.194 13MB035-28 998.13 55156.67 2.065 20.22619 2.04 0.2266755 3.6 0.033252 2.96 210.86922 6.149 207.45057 6.746 168.76837 47.55 210.869 6.1489 13MB035-183 992.13 75692.25 2.481 19.122593 1.91 0.2399608 2.99 0.0332802 2.29 211.04526 4.764 218.38837 5.872 298.27177 43.656 211.045 4.7641 13MB035-257 545.09 85860.51 2.925 19.901278 2.18 0.2310483 6.26 0.033349 5.87 211.47431 12.21 211.06366 11.93 206.4612 50.542 211.474 12.208 13MB035-186 562.36 195216.4 2.228 19.099131 2.61 0.2408955 3.59 0.0333688 2.47 211.59825 5.133 219.15349 7.075 301.11626 59.488 211.598 5.1325 13MB035-69 175.77 11517.79 1.936 20.562181 2.92 0.2238447 4.15 0.0333822 2.95 211.6815 6.135 205.10462 7.705 130.18005 68.728 211.682 6.1352 13MB035-249 520 194158.2 2.482 19.928547 1.68 0.2309812 3.1 0.033385 2.61 211.69895 5.427 211.00839 5.903 203.30073 38.906 211.699 5.427 13MB035-298 1000.3 130575.7 2.071 17.799379 2.88 0.2586248 3.72 0.0333867 2.35 211.70984 4.892 233.55813 7.76 459.55734 63.958 211.71 4.8915 13MB035-284 614.53 39535.75 2.766 19.979428 2.35 0.2304125 3.48 0.0333878 2.56 211.71658 5.33 210.53916 6.611 197.3614 54.707 211.717 5.3298 13MB035-224 627.15 46237.26 2.65 20.052572 2.12 0.2295918 3.52 0.0333907 2.81 211.73444 5.859 209.86161 6.675 188.86523 49.247 211.734 5.8592 13MB035-317 266.25 132806.1 3.169 19.833217 2.14 0.2321494 4.08 0.0333933 3.47 211.7509 7.231 211.97147 7.806 214.44619 49.705 211.751 7.2308 13MB035-271 495.12 44256.63 3.092 20.105723 2.1 0.2291742 4.31 0.0334183 3.76 211.9067 7.84 209.51673 8.154 182.70274 48.897 211.907 7.8397 13MB035-48 690.04 3440699 2.891 19.466887 2.26 0.2366983 3.23 0.0334188 2.31 211.90973 4.808 215.71324 6.279 257.45224 51.996 211.91 4.8078 13MB035-293 545 29779.13 4.718 19.660918 2.63 0.2345696 3.88 0.0334483 2.85 212.09404 5.946 213.96395 7.477 234.61787 60.619 212.094 5.9465 13MB035-242 592.29 73367.04 3.053 20.033847 2.4 0.2303339 3.14 0.0334673 2.03 212.21259 4.242 210.47428 5.972 191.08428 55.73 212.213 4.2419 13MB035-289 493.08 20574.46 2.014 20.078561 2.64 0.2299258 3.72 0.0334826 2.63 212.30784 5.49 210.13744 7.068 185.85137 61.416 212.308 5.4898 13MB035-234 180.25 21558.57 2.8 19.628575 2.47 0.2352481 3.46 0.0334899 2.42 212.35337 5.061 214.52188 6.685 238.39613 56.893 212.353 5.0605 13MB035-310 111.45 8914.309 2.692 20.060264 3.21 0.2302018 3.58 0.0334922 1.59 212.36794 3.324 210.36522 6.811 187.97342 74.774 212.368 3.324 13MB035-50 1068.8 160389.6 1.261 19.557518 1.22 0.2361268 2.32 0.0334933 1.97 212.37456 4.124 215.2439 4.497 246.77283 27.977 212.375 4.1238 13MB035-31 681.1 45628.47 1.8 19.808248 1.57 0.2331463 3.25 0.0334945 2.84 212.38205 5.939 212.79268 6.238 217.32855 36.428 212.382 5.9394 13MB035-41 810.77 60815.33 2.194 20.142076 2.1 0.2293251 3.93 0.0335008 3.33 212.42116 6.95 209.64142 7.452 178.49292 49.014 212.421 6.9498 13MB035-229 688.65 49592.07 3.445 20.018214 2.31 0.2308709 4.55 0.0335192 3.92 212.53604 8.205 210.9174 8.674 192.89891 53.757 212.536 8.2048 13MB035-195 779.98 32830.12 1.203 19.525823 2.72 0.2367252 3.46 0.0335237 2.13 212.56455 4.455 215.73529 6.721 250.46105 62.683 212.565 4.4553 13MB035-252 482.5 44156.74 3.418 19.85188 3.12 0.2330196 4.67 0.03355 3.47 212.7284 7.261 212.68831 8.954 212.22145 72.315 212.728 7.2611 13MB035-91 510.88 47848.24 1.937 20.052222 1.9 0.2307086 3.87 0.0335525 3.37 212.74397 7.049 210.78348 7.357 188.90581 44.149 212.744 7.0486 13MB035-7 609.62 33370.09 1.845 20.103074 1.79 0.2302459 2.83 0.0335701 2.19 212.85388 4.578 210.40164 5.373 183.0094 41.747 212.854 4.578 13MB035-205 467.07 27316.06 2.56 19.889135 2.68 0.2327877 3.11 0.0335795 1.58 212.91253 3.305 212.49739 5.955 207.91776 62.02 212.913 3.3046 13MB035-300 499.7 45231 2.066 19.342455 1.52 0.2395315 2.66 0.0336026 2.18 213.05642 4.565 218.03675 5.214 272.131 34.879 213.056 4.5652 13MB035-84 201.13 17831.83 2.481 20.351345 3.62 0.2277851 4.59 0.0336215 2.81 213.17433 5.9 208.36864 8.638 154.34121 84.796 213.174 5.9003 13MB035-104 442.8 36308.76 2.707 19.993832 2.57 0.2322315 3.67 0.0336756 2.62 213.51195 5.507 212.03918 7.023 195.73273 59.692 213.512 5.5068 13MB035-192 925.41 119590 2.734 19.23211 2.55 0.2414822 4.06 0.033683 3.16 213.55777 6.632 219.6334 8.014 285.22901 58.28 213.558 6.6316 13MB035-17 668.02 32106.95 1.026 20.4895 2.08 0.2266796 2.98 0.0336855 2.14 213.57314 4.486 207.45392 5.59 138.49937 48.787 213.573 4.4856 13MB035-295 671.63 39849.42 2.488 19.415862 2.48 0.2392596 3.9 0.0336918 3.01 213.61294 6.33 217.81399 7.655 263.44125 57.03 213.613 6.3301 13MB035-113 888.15 36985.1 2.336 18.708095 1.75 0.2483734 3.26 0.0337003 2.75 213.66545 5.785 225.25398 6.591 348.0446 39.573 213.665 5.7852 13MB035-83 735.53 80977.85 2.635 20.332355 2.07 0.2287635 4.17 0.0337344 3.62 213.87839 7.617 209.1774 7.884 156.55024 48.462 213.878 7.6166 13MB035-144 761.67 31709.17 1.562 19.516852 2.16 0.2383325 4.26 0.0337359 3.68 213.88743 7.735 217.05408 8.332 251.56293 49.654 213.887 7.7347 13MB035-171 708.4 55682.07 2.468 19.057746 1.97 0.2441975 3.28 0.0337529 2.63 213.99391 5.525 221.85182 6.544 306.04138 44.942 213.994 5.5252 13MB035-33 836.1 104249.4 1.955 20.225299 2.32 0.2301371 3.84 0.0337583 3.05 214.02725 6.424 210.31185 7.286 168.87093 54.266 214.027 6.4244 13MB035-311 664.6 39608.63 3.996 19.811918 1.88 0.2349733 2.85 0.0337632 2.14 214.05802 4.5 214.29595 5.502 216.89568 43.587 214.058 4.5003 13MB035-231 591.88 45197.82 2.38 20.360492 2.32 0.2288423 3.17 0.0337927 2.15 214.24207 4.538 209.24252 5.988 153.32074 54.371 214.242 4.5379 13MB035-118 730.88 39555.66 2.544 19.496617 1.85 0.239131 2.52 0.0338138 1.71 214.37344 3.608 217.70865 4.945 253.92612 42.661 214.373 3.6083

143 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB035-267 788.72 327915.5 3.015 19.977616 2.13 0.233523 3.42 0.0338355 2.67 214.50853 5.637 213.10283 6.572 197.59605 49.564 214.509 5.6372 13MB035-14 396.85 48856.95 1.684 20.175584 2.35 0.2312795 4.04 0.0338425 3.28 214.55218 6.924 211.25437 7.698 174.61597 54.846 214.552 6.9236 13MB035-63 603.89 34471.91 1.053 20.000793 1.93 0.2333121 4.26 0.0338441 3.8 214.56252 8.029 212.92921 8.192 194.92381 44.796 214.563 8.0292 13MB035-226 235.55 48386.15 3.2 20.358223 2.45 0.2292793 3.27 0.0338535 2.18 214.62091 4.593 209.60353 6.199 153.59006 57.271 214.621 4.5932 13MB035-71 915.72 82417.26 1.607 20.09551 1.92 0.2322965 3.09 0.0338564 2.42 214.63894 5.114 212.09272 5.922 183.88505 44.809 214.639 5.1143 13MB035-236 921.01 40898.83 2.244 18.032215 3.7 0.2589386 4.71 0.0338645 2.92 214.68954 6.174 233.81121 9.841 430.64419 82.372 214.69 6.1743 13MB035-218 609.51 71110.8 1.878 19.462273 2.82 0.2399276 4.37 0.0338667 3.34 214.70315 7.054 218.36118 8.592 258.00223 64.852 214.703 7.0545 13MB035-151 648.1 39136.41 2.255 19.63947 2.2 0.2377875 3.29 0.0338702 2.45 214.72498 5.167 216.60708 6.418 237.11624 50.752 214.725 5.1668 13MB035-202 406.72 26572.84 2.082 19.064956 2.94 0.2449947 4.17 0.0338759 2.96 214.76082 6.248 222.50215 8.328 305.18437 66.902 214.761 6.2483 13MB035-270 144.33 7681.137 2.398 19.870884 2.6 0.2351729 3.37 0.0338925 2.14 214.86398 4.519 214.46003 6.507 210.04887 60.252 214.864 4.5192 13MB035-206 858.64 154064.9 1.67 18.227164 2.95 0.2564177 3.84 0.0338974 2.46 214.89444 5.194 231.77597 7.955 406.62959 66.021 214.894 5.1942 13MB035-82 760.28 41504.73 2.241 20.382791 1.94 0.2293815 2.98 0.0339094 2.27 214.96984 4.797 209.68794 5.652 150.76992 45.411 214.97 4.7973 13MB035-309 692.87 47873.63 1.382 19.757753 2.15 0.236641 2.91 0.0339099 1.96 214.97258 4.151 215.6662 5.658 223.25215 49.739 214.973 4.1506 13MB035-148 886.07 88844.69 1.847 19.257425 2.22 0.242947 3.11 0.0339319 2.18 215.11002 4.603 220.83079 6.167 282.26364 50.775 215.11 4.6029 13MB035-258 498.59 25992.96 2.94 18.498089 2.62 0.2529416 4.01 0.0339348 3.04 215.12818 6.427 228.96285 8.216 373.51255 58.878 215.128 6.4265 13MB035-153 734.7 26516.4 2.041 20.583643 1.91 0.2273144 4.01 0.033935 3.53 215.12922 7.472 207.97927 7.549 127.74168 44.906 215.129 7.4716 13MB035-37 746.25 36098.02 1.467 20.177379 3.29 0.2318961 4.49 0.0339357 3.06 215.13361 6.466 211.76276 8.579 174.40877 76.73 215.134 6.4662 13MB035-99 584.96 78301.13 2.363 20.087865 2.32 0.2329691 3.57 0.0339415 2.71 215.16961 5.743 212.64678 6.847 184.77204 53.947 215.17 5.7428 13MB035-39 483.39 55436.7 1.188 16.462317 7.99 0.284377 8.57 0.0339535 3.09 215.24428 6.544 254.12372 19.26 630.23064 172.38 215.244 6.5445 13MB035-274 778.51 70299.74 2.865 19.682574 2.02 0.2379398 4.47 0.0339663 3.98 215.32401 8.435 216.73201 8.715 232.03189 46.63 215.324 8.4354 13MB035-281 690.64 216379.5 3.74 19.55681 2.16 0.2394733 4.44 0.0339667 3.88 215.327 8.223 217.98903 8.719 246.85571 49.819 215.327 8.2227 13MB035-119 596.81 41987.43 1.785 19.247999 2.23 0.2433811 3.7 0.0339759 2.94 215.38422 6.237 221.18529 7.346 283.38457 51.12 215.384 6.237 13MB035-219 579.15 98747.18 2.319 19.703831 2.51 0.2377923 4.15 0.0339819 3.31 215.4213 7.005 216.61101 8.095 229.53865 57.943 215.421 7.0045 13MB035-129 359.74 28368.7 3.917 19.511555 2.71 0.2402041 4.19 0.0339916 3.19 215.48175 6.765 218.58755 8.235 252.18713 62.337 215.482 6.765 13MB035-318 808.67 67032.94 2.958 19.069223 2.04 0.2460258 3.24 0.0340261 2.52 215.69726 5.337 223.3428 6.495 304.68735 46.519 215.697 5.3369 13MB035-40 960.81 39718.25 2.73 18.501416 2.63 0.2536573 3.84 0.034037 2.8 215.76494 5.951 229.54266 7.893 373.10822 59.114 215.765 5.9508 13MB035-87 343.51 30596.8 2.839 20.106333 3.02 0.2335001 5.42 0.0340501 4.5 215.84687 9.562 213.08394 10.43 182.63211 70.422 215.847 9.562 13MB035-197 943.43 27651.08 2.569 19.66331 1.8 0.2388391 3.61 0.0340613 3.13 215.91632 6.641 217.46936 7.065 234.33656 41.534 215.916 6.6412 13MB035-165 1050.3 50121.9 2.05 18.307401 1.9 0.256587 2.86 0.0340691 2.14 215.96492 4.535 231.91281 5.926 396.79123 42.58 215.965 4.5349 13MB035-308 284.21 29874.51 2.404 19.904663 2.64 0.2361778 5.35 0.0340952 4.66 216.12763 9.9 215.2858 10.38 206.09061 61.146 216.128 9.8998 13MB035-100 960.74 19955.98 1.168 20.004046 2.22 0.2350507 3.4 0.0341019 2.58 216.16941 5.478 214.35954 6.578 194.5452 51.701 216.169 5.4777 13MB035-61 748.99 57925.72 2.888 19.59684 2.1 0.2400005 4.9 0.0341112 4.43 216.22757 9.414 218.42082 9.63 242.12084 48.375 216.228 9.4136 13MB035-43 1106.6 219396 1.233 20.017275 2.23 0.2350514 3.28 0.0341245 2.4 216.31068 5.111 214.36016 6.339 193.00892 51.914 216.311 5.1112 13MB035-92 283.94 75162.57 1.717 19.808169 2.31 0.2376021 3.8 0.0341345 3.01 216.37275 6.411 216.45498 7.407 217.33407 53.583 216.373 6.4112 13MB035-88 1030.1 26076.08 1.148 18.972056 1.74 0.2480765 3.07 0.0341349 2.53 216.37546 5.375 225.01252 6.192 316.2737 39.602 216.375 5.3747 13MB035-250 800.58 32858.48 2.209 20.023667 2.16 0.2350983 3.76 0.0341422 3.08 216.42105 6.552 214.3987 7.269 192.26575 50.242 216.421 6.5517 13MB035-138 199.69 14848.2 2.607 19.162136 3.77 0.2456974 4.71 0.0341463 2.82 216.44623 6.004 223.07512 9.431 293.58183 86.101 216.446 6.0041 13MB035-239 679.59 40630.68 4.391 20.002284 1.72 0.2354579 3.72 0.0341579 3.3 216.51894 7.017 214.69426 7.194 194.75094 39.981 216.519 7.0174 13MB035-261 1115.4 31667.94 2.798 20.310643 2.77 0.231942 4.27 0.0341666 3.25 216.573 6.917 211.80056 8.163 159.07292 64.875 216.573 6.9166 13MB035-256 367.37 17125.11 6.577 20.32349 2.75 0.2318533 4.06 0.0341751 2.99 216.62621 6.37 211.72745 7.767 157.58256 64.393 216.626 6.3701 13MB035-320 512.88 36119.53 3.427 19.849453 2.08 0.237604 3.21 0.0342059 2.44 216.81793 5.193 216.45655 6.248 212.50542 48.282 216.818 5.1929 13MB035-93 876.25 84509.33 1.869 20.229634 2.06 0.2332226 5.51 0.0342182 5.11 216.89475 10.89 212.85552 10.57 168.37068 47.992 216.895 10.894 13MB035-313 714.38 37299.45 1.892 16.529059 2.59 0.2854817 3.32 0.0342236 2.08 216.928 4.428 254.9967 7.477 621.46639 55.766 216.928 4.4284 13MB035-210 470.93 27011.85 1.591 20.120439 1.77 0.2346518 3.79 0.0342421 3.35 217.04346 7.143 214.03158 7.305 180.99661 41.22 217.043 7.143 13MB035-191 1027.4 113469.2 2.57 19.401057 1.69 0.2434157 3.39 0.034251 2.94 217.09882 6.273 221.21359 6.742 265.21158 38.888 217.099 6.2727 13MB035-142 520.02 40897.16 2.618 19.414775 2.01 0.2432462 3.26 0.0342513 2.56 217.10095 5.467 221.07512 6.47 263.57426 46.21 217.101 5.4675 13MB035-230 585.54 47109.51 2.322 20.416671 1.92 0.2313452 3.52 0.0342566 2.95 217.13393 6.297 211.30856 6.712 146.877 45.002 217.134 6.297 13MB035-315 713.67 37552.09 2.524 19.525842 1.98 0.2419099 2.98 0.034258 2.22 217.14279 4.742 219.9832 5.887 250.45886 45.602 217.143 4.7421 13MB035-116 724.09 40101.38 2.649 19.415564 2.67 0.2433976 3.57 0.034274 2.37 217.2425 5.066 221.19876 7.104 263.5045 61.394 217.243 5.0659 13MB035-96 632.37 55475.58 2.449 19.542337 2.82 0.2418626 4.93 0.0342802 4.04 217.28136 8.627 219.94451 9.74 248.55976 64.932 217.281 8.6268 13MB035-94 685.44 31072.37 2.134 20.213954 2.64 0.2338794 3.59 0.034288 2.43 217.32959 5.187 213.39614 6.908 170.18024 61.72 217.33 5.1869 13MB035-269 823.79 54629.53 2.544 20.411494 1.75 0.2317353 3.27 0.0343057 2.76 217.43973 5.899 211.63019 6.238 147.43163 40.942 217.44 5.8992 13MB035-123 149.52 36552.79 2.457 19.205496 2.85 0.2463036 3.56 0.034308 2.13 217.45418 4.558 223.56915 7.144 288.41691 65.186 217.454 4.5584 13MB035-112 920.21 39636.35 1.739 20.242576 1.78 0.2337439 3.07 0.0343166 2.51 217.50821 5.362 213.28463 5.914 166.87679 41.592 217.508 5.3616 13MB035-133 884.94 43085.16 2.173 19.657118 1.84 0.2407569 3.81 0.034324 3.33 217.55377 7.129 219.04006 7.503 235.06449 42.52 217.554 7.1289 13MB035-145 436.53 16833.72 2.303 19.341459 1.93 0.2449209 3.41 0.0343569 2.81 217.75905 6.019 222.44202 6.81 272.24859 44.195 217.759 6.0187 13MB035-235 246.95 32762.74 2.815 20.028464 2.41 0.236535 3.72 0.0343591 2.82 217.77278 6.047 215.57911 7.217 191.70825 56.178 217.773 6.0473 13MB035-285 521.33 28500.11 3.338 19.676105 2.75 0.2407856 3.84 0.0343612 2.67 217.7859 5.727 219.06351 7.564 232.79084 63.591 217.786 5.7271 13MB035-6 1162.3 43786.96 1.833 20.625825 1.71 0.2297266 3.41 0.0343654 2.95 217.81202 6.318 209.97294 6.467 122.87745 40.247 217.812 6.3181 13MB035-238 190.48 30067.72 2.502 20.314452 2.41 0.2333309 5.29 0.0343776 4.71 217.88841 10.09 212.9447 10.17 158.58802 56.398 217.888 10.093 13MB035-215 1087.4 49906.28 2.702 19.606293 2.06 0.2418642 3.43 0.0343927 2.74 217.982 5.88 219.94583 6.781 241.00842 47.407 217.982 5.8798 13MB035-111 228.3 14586.61 1.74 19.498666 3.97 0.2433047 4.86 0.0344076 2.81 218.07499 6.035 221.12297 9.665 253.68165 91.268 218.075 6.0352 13MB035-201 272.9 10715.49 2.688 19.239078 2.43 0.2466431 3.01 0.0344153 1.78 218.12325 3.809 223.84568 6.046 284.42177 55.591 218.123 3.8094 13MB035-35 719.52 25926.81 2.847 20.537884 1.94 0.2310745 3.08 0.0344197 2.39 218.15018 5.128 211.08532 5.872 132.97778 45.676 218.15 5.1284 13MB035-243 758.09 28240.03 2.785 19.93994 2.05 0.2380795 3.29 0.0344306 2.58 218.21837 5.525 216.84659 6.425 201.95865 47.527 218.218 5.5255 13MB035-180 457.04 35729.79 2.289 16.671964 3.6 0.2847844 5.35 0.0344351 3.96 218.24662 8.489 254.44577 12.04 602.86552 77.956 218.247 8.4891 13MB035-279 453.99 47753.83 3.383 19.593481 2.99 0.2424076 4.48 0.0344474 3.34 218.32319 7.161 220.39004 8.881 242.49677 69.014 218.323 7.1608 13MB035-178 1077.7 73261.64 2.775 19.25187 2.27 0.246893 3.61 0.0344731 2.8 218.48332 6.025 224.04923 7.26 282.92434 52.048 218.483 6.0255 13MB035-77 815.61 28525.51 1.281 19.994771 2.04 0.2377291 5.4 0.0344745 5 218.49177 10.73 216.55922 10.52 195.62264 47.371 218.492 10.733 13MB035-147 1166.8 44342.98 1.895 19.647068 2.01 0.2419651 3.23 0.0344786 2.54 218.5173 5.451 220.0283 6.399 236.21871 46.298 218.517 5.4506 13MB035-156 711.37 35561.52 2.796 19.605365 1.97 0.2427463 2.79 0.0345165 1.98 218.7535 4.257 220.66683 5.542 241.12052 45.452 218.753 4.257 13MB035-157 499.35 25904.29 2.069 19.914426 2.06 0.2390068 4.51 0.0345205 4.01 218.7785 8.629 217.60685 8.833 204.97294 47.807 218.778 8.629 13MB035-38 837.69 47473.71 2.029 20.754792 2.15 0.2294014 3.49 0.0345313 2.75 218.84609 5.922 209.70444 6.617 108.20881 50.791 218.846 5.922 13MB035-244 462.64 74835.22 3.543 19.743394 1.84 0.241391 5.44 0.0345654 5.12 219.05841 11.02 219.55884 10.73 224.93163 42.446 219.058 11.019 13MB035-323 662.38 46574.36 2.492 20.007171 1.62 0.2382824 2.37 0.0345761 1.72 219.12527 3.714 217.01302 4.625 194.18229 37.69 219.125 3.714 13MB035-237 268.33 21675.31 3.676 20.043795 2.41 0.2379177 4.07 0.0345864 3.27 219.18927 7.051 216.71389 7.933 189.92892 56.138 219.189 7.0506 13MB035-78 655.15 37535.39 1.904 20.280848 2.15 0.2352088 6.24 0.034597 5.86 219.25529 12.63 214.48955 12.07 162.47636 50.277 219.255 12.634

144 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB035-136 844.98 66261.47 2.345 18.106711 3.97 0.2634932 4.87 0.0346025 2.82 219.28971 6.072 237.47808 10.31 421.44872 88.667 219.29 6.0718 13MB035-324 392.31 34161.39 2.026 19.805424 2 0.2409101 5.75 0.0346049 5.39 219.3047 11.63 219.16545 11.34 217.64851 46.345 219.305 11.627 13MB035-255 769.62 27433.04 2.75 19.823254 2.01 0.2407024 3.56 0.0346062 2.94 219.31272 6.349 218.99545 7.021 215.58444 46.525 219.313 6.3488 13MB035-196 807.68 158161.2 2.397 19.461827 2.26 0.245355 3.16 0.034632 2.2 219.47324 4.753 222.79602 6.312 258.05227 51.938 219.473 4.7527 13MB035-134 1064.9 83863.9 1.711 17.197251 3.67 0.2777329 4.82 0.0346406 3.12 219.52684 6.744 248.85756 10.64 535.38563 80.326 219.527 6.7445 13MB035-21 826.07 45075.85 1.437 19.90921 1.92 0.2399167 3.77 0.0346428 3.24 219.54075 6.997 218.3522 7.398 205.54474 44.435 219.541 6.9969 13MB035-233 275.33 36760.77 2.951 19.924382 2.49 0.2397729 3.81 0.0346484 2.88 219.57576 6.215 218.23443 7.48 203.76856 57.868 219.576 6.2153 13MB035-280 470.91 33107.98 2.358 20.128195 2.04 0.237429 2.95 0.0346607 2.13 219.65219 4.589 216.31298 5.738 180.09956 47.524 219.652 4.5891 13MB035-86 710.72 31475.16 2.225 19.850044 1.71 0.2407729 3.34 0.0346631 2.87 219.66731 6.194 219.05311 6.577 212.43643 39.588 219.667 6.1942 13MB035-122 297.31 17875.14 2.139 19.207217 2.93 0.2490665 4.12 0.0346959 2.89 219.87169 6.254 225.81764 8.341 288.19559 67.018 219.872 6.2541 13MB035-266 1175.3 44056.11 1.523 18.252097 2.88 0.2623564 3.68 0.0347299 2.28 220.08314 4.942 236.56408 7.757 403.56887 64.493 220.083 4.9421 13MB035-141 177.08 50860.37 1.692 19.088735 2.49 0.2508768 3.5 0.0347325 2.45 220.09968 5.312 227.28814 7.122 302.33362 56.776 220.1 5.3117 13MB035-248 247.41 92256.39 4.272 19.86826 2.43 0.2410396 3.09 0.0347334 1.9 220.10496 4.12 219.27137 6.093 210.32622 56.424 220.105 4.1199 13MB035-70 756.48 42139.48 2.313 20.459661 2.11 0.2340845 2.89 0.0347352 1.97 220.11639 4.266 213.56493 5.557 141.9227 49.459 220.116 4.266 13MB035-47 1012.1 630740.6 1.849 20.109873 1.85 0.2382327 2.99 0.0347464 2.35 220.18591 5.085 216.97223 5.845 182.22083 43.189 220.186 5.0848 13MB035-140 281.36 119102.7 1.643 19.237011 2.88 0.2496092 5.03 0.0348255 4.13 220.67863 8.949 226.25864 10.2 284.68908 65.789 220.679 8.9491 13MB035-11 228.44 38531.66 2.075 19.20172 3.63 0.2501627 8.18 0.0348387 7.34 220.76081 15.92 226.7083 16.63 288.86488 82.886 220.761 15.92 13MB035-101 219.92 54267.16 1.414 20.870355 2.96 0.2303465 4.33 0.0348666 3.16 220.93519 6.867 210.48467 8.232 95.05441 70.053 220.935 6.8675 13MB035-222 657.46 29186.08 2.175 19.871431 1.97 0.2419419 3.45 0.034869 2.83 220.94962 6.15 220.00936 6.828 209.94134 45.77 220.95 6.15 13MB035-251 1041.7 70708.79 3.228 20.272627 1.89 0.2375479 2.98 0.0349269 2.31 221.31052 5.023 216.41057 5.816 163.4084 44.215 221.311 5.0227 13MB035-121 981.24 31164.92 2.171 16.543288 8.1 0.2917737 8.37 0.035008 2.11 221.81537 4.599 259.95455 19.21 619.6095 175.16 221.815 4.5987 13MB035-160 314.83 179306.3 3.001 19.533526 2.5 0.2476431 3.71 0.0350837 2.75 222.28726 6 224.65986 7.485 249.58655 57.532 222.287 6.0005 13MB035-173 351.49 142157.8 2.128 19.480907 2.93 0.2484335 4.35 0.0351009 3.21 222.3942 7.017 225.30294 8.785 255.78542 67.427 222.394 7.0172 13MB035-12 902.14 110166.4 1.818 19.859111 2.25 0.2439076 3.61 0.0351305 2.82 222.57832 6.172 221.61515 7.19 211.39077 52.257 222.578 6.1724 13MB035-114 598.74 102804.9 2.59 19.978895 2.5 0.2425426 3.72 0.0351446 2.76 222.6662 6.039 220.50033 7.375 197.44998 58.016 222.666 6.0393 13MB035-20 265.53 40497.16 2.291 20.077821 2.79 0.2413729 4.33 0.0351483 3.31 222.68922 7.253 219.54406 8.559 185.93713 65.086 222.689 7.2531 13MB035-273 565.34 39388.92 2.182 20.009446 2.13 0.2426642 3.56 0.035216 2.86 223.11079 6.271 220.59971 7.067 193.91849 49.473 223.111 6.2711 13MB035-110 404.67 175016.2 1.524 19.81627 2.12 0.2451831 3.2 0.035238 2.39 223.24799 5.25 222.65582 6.398 216.41012 49.216 223.248 5.2503 13MB035-107 1196.5 63397.54 1.373 19.773128 2.23 0.2458148 3.15 0.0352519 2.22 223.33441 4.879 223.17083 6.302 221.42364 51.485 223.334 4.879 13MB035-228 1224.3 50121.02 2.043 19.435598 1.75 0.2500869 2.96 0.0352523 2.39 223.33711 5.25 226.64673 6.016 261.13409 40.141 223.337 5.2497 13MB035-89 198.13 17457.08 2.116 20.889619 2.87 0.2328456 3.86 0.0352775 2.57 223.49371 5.645 212.54502 7.394 92.862676 68.072 223.494 5.6452 13MB035-221 564.49 100751.3 2.31 19.68522 2.56 0.2472215 3.44 0.035296 2.29 223.60905 5.044 224.31666 6.919 231.72217 59.12 223.609 5.0437 13MB035-225 372.17 63834.13 4.374 20.144868 2.59 0.2417205 5.72 0.0353164 5.09 223.73633 11.2 219.82833 11.3 178.16871 60.5 223.736 11.201 13MB035-67 210.29 21792.19 2.71 20.30235 2.89 0.2399324 3.92 0.0353292 2.66 223.816 5.841 218.36511 7.708 160.00184 67.552 223.816 5.8413 13MB035-137 733.21 60131.07 2.469 19.84842 2.23 0.2454788 2.75 0.0353377 1.62 223.86899 3.565 222.89688 5.51 212.62508 51.593 223.869 3.5646 13MB035-128 345.78 24053.18 3.029 19.418032 2.05 0.2511135 3.27 0.035365 2.55 224.03896 5.61 227.48026 6.669 263.2045 47.156 224.039 5.6104 13MB035-262 228.5 38164.06 2.157 20.151762 2.43 0.2420076 3.42 0.0353705 2.41 224.07281 5.305 220.06304 6.764 177.37197 56.591 224.073 5.3048 13MB035-120 1043 45019.18 2.125 19.889216 1.86 0.2452683 2.65 0.03538 1.89 224.13222 4.173 222.72531 5.308 207.91136 43.122 224.132 4.1725 13MB035-312 1079.9 25780.5 1.57 19.563421 2.24 0.249472 5.85 0.0353969 5.41 224.2375 11.92 226.14721 11.87 246.07816 51.491 224.237 11.925 13MB035-319 126.89 42415.85 2.729 19.131441 3.72 0.2555978 4.7 0.0354653 2.88 224.66319 6.359 231.11313 9.717 297.22292 84.773 224.663 6.3588 13MB035-220 431.19 28811.34 1.908 19.278533 2.35 0.2536863 7.36 0.0354707 6.98 224.69685 15.41 229.56615 15.13 279.75712 53.714 224.697 15.41 13MB035-98 1489.3 161619.4 2.247 19.940382 1.7 0.245639 3 0.0355246 2.47 225.03264 5.47 223.02754 6.011 201.93115 39.495 225.033 5.4702 13MB035-16 227.62 201867.3 1.798 19.973985 3.91 0.2452996 4.84 0.0355353 2.85 225.09924 6.302 222.75085 9.681 198.03974 90.929 225.099 6.3022 13MB035-54 758.72 44175.22 2.06 19.38393 1.78 0.2528685 4.16 0.0355496 3.76 225.18837 8.317 228.90361 8.524 267.22765 40.864 225.188 8.3166 13MB035-27 577.91 35178.06 2.134 20.591812 1.66 0.2389153 2.56 0.035681 1.95 226.00613 4.331 217.53185 5.01 126.80885 38.976 226.006 4.3307 13MB035-109 228.07 15258.52 2.07 20.767377 2.58 0.2369943 3.77 0.0356959 2.76 226.09871 6.125 215.95622 7.342 106.78803 60.88 226.099 6.1249 13MB035-297 408.78 33376.24 5.509 19.849497 2.29 0.2488132 5.78 0.0358197 5.31 226.8691 11.84 225.61167 11.7 212.5004 53.026 226.869 11.842 13MB035-60 227.6 14839.55 2.016 20.921722 3.24 0.2366577 7.22 0.0359101 6.45 227.43194 14.42 215.6799 14.03 89.266302 76.754 227.432 14.42 13MB035-213 1291 92388.19 2.103 19.946118 2.13 0.2501464 4.98 0.0361869 4.51 229.1541 10.14 226.69508 10.12 201.23833 49.384 229.154 10.144 13MB035-24 772.18 90222.73 2.709 18.966732 3.15 0.2704261 5.33 0.0371997 4.29 235.45216 9.93 243.03432 11.52 316.91195 71.736 235.452 9.9296 13MB035-81 387.87 42355.65 3.388 17.36663 3 0.2962666 4.57 0.0373162 3.45 236.17576 7.99 263.48001 10.61 513.88245 65.998 236.176 7.9898 13MB035-211 541.84 194106.5 3.228 15.919831 4.51 0.3297922 6.62 0.0380783 4.84 240.91033 11.45 289.40721 16.67 701.98394 96.127 240.91 11.447 13MB035-32 32.497 2300.39 2.56 23.749022 7.06 0.2224274 7.86 0.0383118 3.45 242.36026 8.207 203.92803 14.52 220.10819 177.8 242.36 8.2067 13MB035-330 463.08 31076.37 4.587 18.738347 1.67 0.2859395 6.15 0.0388601 5.92 245.7636 14.27 255.35828 13.89 344.39012 37.797 245.764 14.272 13MB035-325 547.83 94978.36 0.95 19.150633 2.54 0.3022724 3.8 0.0419837 2.84 265.11692 7.364 268.17355 8.966 294.92855 57.893 265.117 7.3644 13MB035-198 1020.2 33091.06 1.698 16.372958 1.58 0.3683774 2.93 0.043744 2.46 275.99857 6.657 318.45014 7.998 641.94361 33.947 275.999 6.6569 13MB035-13 737.81 43306.61 2.115 19.766456 1.71 0.322277 3.13 0.0462016 2.62 291.15918 7.456 283.65261 7.746 222.24919 39.659 291.159 7.4563 13MB035-306 354.5 42073.93 6.736 16.682763 4.98 0.4637817 7.18 0.0561152 5.16 351.95645 17.68 386.88459 23.09 601.4641 107.95 351.956 17.677 13MB035-176 996.44 75709.79 23.97 17.852631 2.04 0.4380471 3.68 0.0567181 3.07 355.63565 10.62 368.87443 11.4 452.90781 45.26 355.636 10.618 13MB035-169 472.56 75585.88 6.421 14.188462 1.69 0.5526522 2.39 0.0568704 1.7 356.56438 5.881 446.73259 8.641 942.34591 34.547 356.564 5.8811 13MB035-188 716.1 35032.59 1.46 18.578106 2.3 0.4240259 4.45 0.0571337 3.82 358.17057 13.3 358.9257 13.47 363.78795 51.762 358.171 13.299 13MB035-307 310.88 30519.87 10.37 18.708631 1.97 0.4360242 5.18 0.0591632 4.79 370.53419 17.25 367.44509 15.97 347.97928 44.471 370.534 17.252 13MB035-296 643.58 50183.3 4.786 16.514784 1.65 0.5200994 3.7 0.0622957 3.31 389.57168 12.51 425.21776 12.84 623.33036 35.543 389.572 12.506 13MB035-139 374.5 31598.73 2.412 17.557205 2.36 0.5576441 5.22 0.0710086 4.66 442.22959 19.92 449.99188 18.99 489.87563 52.089 442.23 19.916 13MB035-162 393.84 54216.13 1.109 17.882976 1.69 0.5560728 3.47 0.0721224 3.03 448.92981 13.14 448.96707 12.59 449.13677 37.485 448.93 13.142 13MB035-154 999.89 77339.28 1.645 17.982482 1.87 0.5551632 2.84 0.0724051 2.14 450.62923 9.298 448.37332 10.28 436.79666 41.559 450.629 9.2976 13MB035-135 1368.5 108451.7 17.02 17.466721 1.56 0.5987207 2.77 0.0758463 2.29 471.28192 10.39 476.42155 10.52 501.26404 34.298 471.282 10.387 13MB035-10 451.5 54295.67 2.77 17.325275 1.76 0.6397562 5.14 0.0803884 4.83 498.44065 23.16 502.15524 20.36 519.09579 38.612 498.441 23.162 13MB035-263 1301.1 210517.8 14.96 16.717729 1.66 0.665634 3.81 0.080707 3.43 500.34168 16.52 518.05433 15.46 596.97211 35.885 500.342 16.521 13MB035-127 322.66 38978.83 0.714 16.768984 2.21 0.6905477 4.5 0.0839845 3.92 519.86206 19.57 533.12945 18.65 590.30919 47.894 519.862 19.569 13MB035-74 1320.6 163388.9 8.109 16.849473 1.37 0.7018961 2.78 0.0857744 2.42 530.49794 12.31 539.92279 11.65 579.90248 29.843 530.498 12.313 13MB035-125 1528.5 55712.33 2.513 16.042255 1.98 0.7635634 2.73 0.0888401 1.88 548.67392 9.886 576.06379 12.01 685.6559 42.302 548.674 9.8861 13MB035-172 230.91 46059.39 0.725 16.571695 2.71 0.73977 3.57 0.0889124 2.33 549.10175 12.24 562.27133 15.43 615.90607 58.572 549.102 12.244 13MB035-161 120.78 10029.24 0.375 16.773084 2.4 0.7445876 4.46 0.090579 3.76 558.96039 20.14 565.07913 19.33 589.80527 51.986 558.96 20.144 13MB035-190 365.4 200841.6 4.168 16.129235 1.53 0.8448091 3.12 0.098826 2.72 607.52497 15.77 621.79603 14.51 674.06923 32.635 607.525 15.773 13MB035-131 565.19 64269.64 1.782 15.868039 1.51 0.9421308 4.06 0.1084259 3.77 663.5999 23.79 673.99679 20.01 708.8778 32.039 663.6 23.792 13MB035-174 694.77 383306.6 1.103 15.269338 2.16 1.0048353 3.72 0.1112792 3.03 680.17242 19.55 706.26178 18.93 790.12091 45.32 680.172 19.549

145 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB035-130 304.39 109746.1 1.589 15.794144 1.57 0.9723385 3.17 0.1113813 2.76 680.76493 17.84 689.66838 15.89 718.79488 33.209 680.765 17.839 13MB035-277 428.53 138809.4 11.2 15.002026 1.34 1.0257445 3.51 0.1116061 3.24 682.06856 20.99 716.79678 18.05 827.07676 28.024 682.069 20.995 13MB035-288 396.72 43165.96 54.56 14.793459 1.34 1.0774511 3.02 0.1156022 2.7 705.20116 18.05 742.38888 15.88 856.21681 27.8 705.201 18.055 13MB035-223 179.43 156979.5 2.393 15.548858 1.32 1.1105622 2.42 0.1252392 2.03 760.64849 14.59 758.44482 12.94 751.93401 27.808 760.648 14.585 13MB035-216 558.71 75192.56 1.615 15.26239 0.94 1.1523663 2.55 0.1275592 2.37 773.92623 17.28 778.36 13.87 791.07597 19.849 773.926 17.283 13MB035-193 127.47 28936.45 0.547 15.133756 2.24 1.1707223 3.8 0.1284989 3.07 779.29617 22.53 786.98274 20.8 808.80964 46.794 779.296 22.533 13MB035-303 535.7 86723.14 3.196 14.211582 2.02 1.260029 3.24 0.1298738 2.54 787.14575 18.8 827.92064 18.36 939.00729 41.386 787.146 18.802 13MB035-97 457.04 222428.3 1.665 14.941131 1.91 1.2066785 4.03 0.1307597 3.55 792.19767 26.48 803.66393 22.39 835.59482 39.744 792.198 26.483 13MB035-52 359.31 116121.8 0.64 14.983148 1.94 1.2217088 4.11 0.1327607 3.62 803.5954 27.35 810.55655 22.95 829.70482 40.548 803.595 27.348 13MB035-30 1087.3 7123876 7.834 14.169739 1.21 1.2964448 2.8 0.1332339 2.53 806.2876 19.16 844.15108 16.07 945.08757 24.83 806.288 19.157 13MB035-65 284.98 74217.46 1.403 15.375733 1.59 1.2035245 5.07 0.1342114 4.81 811.84613 36.71 802.21162 28.12 775.53072 33.499 811.846 36.708 13MB035-314 487.74 68389.04 6.483 14.546061 1.88 1.3094356 3.14 0.1381428 2.52 834.15191 19.69 849.87883 18.1 891.18218 38.884 834.152 19.694 13MB035-272 389.14 122008.2 9.742 14.248877 2.14 1.345897 6.2 0.1390885 5.82 839.506 45.84 865.78446 36.16 933.65639 43.943 839.506 45.835 13MB035-247 105.31 41484.8 2.629 15.077297 2.8 1.2745953 5.01 0.1393781 4.16 841.14477 32.79 834.44395 28.52 816.66588 58.463 841.145 32.788 13MB035-126 761.43 487644.1 4.841 14.249329 1.61 1.3575968 3.83 0.140302 3.48 846.37008 27.58 870.83595 22.4 933.60584 32.968 846.37 27.575 13MB035-194 739.36 83983.26 4.802 14.53498 1.52 1.3804403 3.11 0.1455227 2.71 875.81662 22.21 880.62697 18.31 892.71528 31.409 875.817 22.209 13MB035-232 289.67 127456.4 1.942 14.42794 2.07 1.452729 3.95 0.1520154 3.36 912.25108 28.62 911.00298 23.77 907.96041 42.708 907.96 42.708 13MB035-177 504.42 60126.05 8.911 14.350059 2.13 1.5272013 3.68 0.1589457 3 950.91498 26.5 941.37432 22.57 919.13911 43.846 919.139 43.846 13MB035-108 113.81 24659.57 0.399 14.208523 2.76 1.5270373 5.2 0.1573611 4.4 942.09493 38.59 941.30842 31.91 939.44838 56.649 939.448 56.649 13MB035-62 140.73 32909.42 2.49 14.200868 2.34 1.5170906 3.44 0.1562518 2.53 935.91363 22.02 937.30387 21.08 940.59304 47.944 940.593 47.944 13MB035-322 338.52 234999.1 1.082 14.145413 1.63 1.4591195 5.11 0.1496943 4.84 899.24939 40.62 913.64508 30.78 948.60665 33.452 948.607 33.452 13MB035-102 53.567 20119.86 5.128 14.096376 2.53 1.557736 3.33 0.1592576 2.17 952.64958 19.25 953.56907 20.62 955.67235 51.709 955.672 51.709 13MB035-316 212.3 111298.6 1.023 13.971258 1.82 1.5693172 3.66 0.1590175 3.18 951.31462 28.09 958.15626 22.71 973.9019 37.105 973.902 37.105 13MB035-292 155.27 107763.2 3.661 13.874614 1.56 1.6903418 3.02 0.170096 2.59 1012.6402 24.25 1004.8924 19.27 988.05172 31.709 988.052 31.709 13MB035-164 87.978 37062.61 3.281 13.843159 1.77 1.4993611 5.84 0.1505359 5.56 903.9669 46.92 930.12656 35.57 992.63895 35.918 992.639 35.918 13MB035-254 383.49 54456.69 2.777 13.748236 1.61 1.5061903 3.65 0.1501846 3.28 901.99835 27.59 932.8972 22.3 1006.6044 32.705 1006.6 32.705 13MB035-181 431.66 65181.21 1.612 13.647922 1.41 1.5831301 2.76 0.1567046 2.38 938.43766 20.75 963.60043 17.2 1021.4448 28.599 1021.44 28.599 13MB035-268 510.98 103193.2 3.644 13.609751 2.11 1.7242733 4.55 0.1701982 4.03 1013.2032 37.8 1017.6186 29.26 1027.1131 42.775 1027.11 42.775 13MB035-51 575.4 56336.18 5.475 13.606569 1.59 1.6309229 3.78 0.1609462 3.43 962.03308 30.67 982.21527 23.81 1027.5857 32.174 1027.59 32.174 13MB035-158 837.06 182404.8 0.902 13.599238 1.98 1.5453802 3.97 0.1524223 3.44 914.52774 29.36 948.65212 24.49 1028.675 40.061 1028.67 40.061 13MB035-326 338.39 160009.7 3.882 13.344165 2.3 1.7866566 7.3 0.1729144 6.93 1028.149 65.86 1040.6077 47.56 1066.888 46.153 1066.89 46.153 13MB035-34 205.41 61875.24 1.538 13.258374 1.79 1.4939452 4.35 0.143656 3.96 865.30295 32.06 927.92394 26.44 1079.8039 35.978 1079.8 35.978 13MB035-56 106.22 125161.7 0.79 13.140338 1.92 1.9809971 5.46 0.1887944 5.11 1114.8408 52.34 1109.0601 36.87 1097.7612 38.485 1097.76 38.485 13MB035-259 517.56 198277.5 1.21 12.884784 1.21 1.8579893 5.14 0.1736277 5 1032.0681 47.66 1066.2724 33.95 1136.951 24.053 1136.95 24.053 13MB035-199 389.53 177372.3 19.3 12.869464 2.09 2.0770181 3.02 0.193865 2.18 1142.2786 22.8 1141.2509 20.68 1139.302 41.536 1139.3 41.536 13MB035-276 280.1 73761.89 1.895 11.960441 1.25 2.6293511 2.85 0.2280838 2.56 1324.4486 30.69 1308.8835 20.99 1283.4511 24.369 1283.45 24.369 13MB035-117 94.405 97987.2 0.989 11.037389 1.6 3.2591506 2.65 0.2608973 2.11 1494.4308 28.2 1471.3609 20.6 1438.2141 30.482 1438.21 30.482 13MB035-132 275.07 64750.87 1.616 11.006938 1.36 3.2001744 4.09 0.2554694 3.85 1466.6206 50.53 1457.2027 31.62 1443.4795 25.993 1443.48 25.993 13MB035-55 380.34 187055 1.85 10.996491 1.87 2.7782425 3.47 0.2215761 2.92 1290.1979 34.1 1349.707 25.89 1445.2883 35.706 1445.29 35.706 13MB035-328 649.92 62602.08 2.791 10.617114 1.55 3.061656 3.51 0.2357554 3.15 1364.5925 38.72 1423.1515 26.87 1511.8621 29.266 1511.86 29.266 13MB035-227 241.46 57375.39 1.42 10.46971 1.87 3.5643494 4.37 0.2706535 3.95 1544.1182 54.26 1541.6317 34.69 1538.2059 35.246 1538.21 35.246 13MB035-90 894.98 58499.68 1.047 10.10408 1.88 3.3925238 4.95 0.2486099 4.58 1431.3028 58.74 1502.6694 38.83 1604.7826 35.095 1604.78 35.095 13MB035-72 317.94 82394.16 1.14 9.8462216 2.12 3.7642838 4.04 0.2688133 3.44 1534.7753 47.01 1585.1624 32.44 1652.8405 39.27 1652.84 39.27 13MB035-302 176.11 41430.97 4.354 9.5601055 1.74 4.2933142 3.21 0.297683 2.7 1679.8091 39.93 1692.0796 26.46 1707.299 32.004 1707.3 32.004 13MB035-106 357.08 50127.3 7.977 9.4251692 1.88 4.2535419 3.87 0.2907626 3.38 1645.3391 49.08 1684.4215 31.82 1733.4206 34.543 1733.42 34.543 13MB035-301 287.3 177412.3 4.919 8.846623 1.77 5.1407945 3.69 0.3298424 3.24 1837.6177 51.76 1842.8737 31.35 1848.7987 31.94 1848.8 31.94 13MB035-245 271.32 76360.46 1.684 7.9011061 1.41 5.8718339 2.8 0.3364809 2.42 1869.7176 39.25 1957.0808 24.28 2050.7759 24.824 2050.78 24.824 13MB035-287 795.56 146710.6 5.09 6.5832013 1.78 8.7045514 4.11 0.4156064 3.7 2240.5029 70.06 2307.5544 37.41 2367.4319 30.312 2367.43 30.312 13MB035-204 166.13 136361.5 2.868 6.4293973 1.73 9.3251324 3.33 0.4348345 2.85 2327.4747 55.74 2370.4939 30.59 2407.6819 29.32 2407.68 29.32 13MB035-80 229.43 229691.3 1.462 6.3759614 1.79 8.7599797 3.54 0.4050863 3.05 2192.417 56.77 2313.3374 32.27 2421.8537 30.364 2421.85 30.364 13MB035-241 262.23 57873.7 2.001 6.2620664 1.53 9.5889414 3.18 0.4354989 2.79 2330.459 54.57 2396.1113 29.29 2452.3858 25.961 2452.39 25.961 13MB035-124 285.61 83670.85 1.25 6.2447074 1.82 10.055721 3.66 0.4554325 3.18 2419.3594 64.08 2439.9128 33.83 2457.0804 30.777 2457.08 30.777 13MB035-36 323.11 163809.1 1.865 6.1243466 1.25 8.7439223 2.7 0.3883871 2.39 2115.3437 43.15 2311.6655 24.59 2489.9269 21.007 2489.93 21.007 13MB035-85 1055 957453.3 1.641 6.1225521 1.76 9.0066342 2.68 0.399939 2.03 2168.7584 37.35 2338.6793 24.54 2490.4207 29.633 2490.42 29.633 13MB035-294 66.057 46951.34 0.912 6.0107001 1.84 10.490614 3.19 0.4573248 2.6 2427.735 52.56 2479.0888 29.54 2521.4371 30.952 2521.44 30.952 13MB035-327 70.41 61365.08 2.135 5.9958249 1.92 10.881211 3.7 0.4731784 3.16 2497.4842 65.37 2513.0307 34.38 2525.5989 32.263 2525.6 32.263 13MB035-75 217.14 203871.3 0.81 5.9412581 2.24 9.867636 4.04 0.4251971 3.36 2284.0296 64.59 2422.4899 37.25 2540.9398 37.62 2540.94 37.62 13MB035-149 329.33 111577.2 2.46 5.6136359 1.65 12.659482 3.38 0.5154172 2.94 2679.7149 64.56 2654.6519 31.77 2635.5971 27.417 2635.6 27.417 13MB035-184 132.93 138594.5 1.386 5.3423231 1.69 12.761098 3.44 0.4944438 2.99 2589.8733 63.84 2662.1776 32.36 2717.5685 27.809 2717.57 27.809 13MB035-290 151.84 82216.78 2.07 4.9288963 1.94 15.169437 3.23 0.5422729 2.58 2792.9555 58.51 2825.9358 30.78 2849.5348 31.645 2849.53 31.645 13MB035-209 417.29 71243.4 3.217 4.2103703 1.59 20.292332 3.13 0.6196564 2.69 3108.5515 66.4 3105.3937 30.29 3103.3378 25.412 3103.34 25.412 13MB035-253 934.55 122722.6 3.778 4.0518902 1.3 21.545256 3.56 0.6331521 3.32 3162.0432 82.87 3163.4509 34.58 3164.3302 20.657 3164.33 20.657 13MB035-59 89.286 230920.3 1.793 3.0364904 1.27 33.107921 2.64 0.7291259 2.31 3530.1599 62.93 3583.8246 26.05 3613.9477 19.554 3613.95 19.554 13MB037c 13MB037C-80 362.49 2092.784 1.19 24.541387 14.9 0.036351 15.2 0.0064702 3.15 41.574948 1.307 36.255198 5.415 -303.3519 382.07 41.5749 1.3072 13MB037C-94 383.7 1425.19 0.939 30.867069 15.1 0.029501 15.5 0.0066044 3.22 42.434524 1.363 29.5215 4.505 -928.76817 443.92 42.4345 1.3633 13MB037C-50 310.9 8282.069 1.077 21.348995 26.1 0.0432321 27.6 0.0066939 8.87 43.008185 3.802 42.974745 11.6 41.131162 633.58 43.0082 3.8016 13MB037C-59 241.96 2986.529 1.121 22.792061 25.3 0.0405895 25.6 0.0067096 3.73 43.108349 1.604 40.399437 10.15 -117.68338 633.57 43.1083 1.6042 13MB037C-66 944.52 3856.019 1.592 21.532909 6.88 0.0431088 7.32 0.0067324 2.48 43.254158 1.07 42.854746 3.07 20.576373 165.37 43.2542 1.07 13MB037C-46 866.82 10424.66 1.83 21.579896 3.04 0.0430206 4.41 0.0067333 3.19 43.259851 1.374 42.768904 1.845 15.315322 73.126 43.2599 1.3744 13MB037C-64 904.61 12042.36 1.4 21.813993 5.25 0.042612 6.51 0.0067416 3.85 43.313595 1.663 42.37103 2.703 -10.656382 126.95 43.3136 1.6632 13MB037C-87 534.31 4329.91 1.44 23.835001 8.47 0.0411856 9.37 0.0071197 4.02 45.733719 1.831 40.980968 3.764 -229.20748 213.7 45.7337 1.8308 13MB037C-25 421.58 5448.876 1.213 20.220756 9.65 0.0715887 10.5 0.0104988 4.03 67.326911 2.701 70.205898 7.094 169.39541 225.76 67.3269 2.7009 13MB037C-18 597.65 7904.211 1.379 19.485497 4.66 0.2398102 5.15 0.0338905 2.18 214.85166 4.614 218.26502 10.11 255.23181 107.26 214.852 4.6137 13MB037C-78 427.07 8470.528 1.513 20.285494 2.58 0.2306224 2.94 0.0339301 1.41 215.09891 2.985 210.71233 5.589 161.94519 60.251 215.099 2.9847 13MB037C-19 164.05 5600.595 1.473 20.092958 7.16 0.2334804 7.69 0.0340246 2.82 215.68783 5.975 213.06778 14.78 184.18215 166.84 215.688 5.9747 13MB037C-28 526.17 30785.84 1.371 19.978585 2.29 0.2362713 2.66 0.0342353 1.35 217.00136 2.884 215.36259 5.154 197.46913 53.121 217.001 2.8838

146 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB037C-26 409.92 20743.67 1.153 20.402102 1.36 0.2314891 2.07 0.0342534 1.56 217.11426 3.328 211.42719 3.949 148.52279 31.886 217.114 3.3279 13MB037C-77 469.24 5484.369 1.205 20.469287 2.4 0.2322996 2.89 0.0344866 1.61 218.56717 3.468 212.09529 5.54 140.83805 56.423 218.567 3.4678 13MB037C-81 316.58 13355.77 1.454 20.63939 4.33 0.2310847 5.7 0.0345913 3.7 219.2197 7.979 211.09368 10.86 121.32961 102.14 219.22 7.979 13MB037C-27 506.26 11535.14 1.939 19.678624 3.03 0.2438607 3.67 0.0348045 2.06 220.548 4.477 221.57689 7.305 232.49544 70.051 220.548 4.4771 13MB037C-52 283.36 18355.52 2.108 19.93505 3.17 0.2435113 4.11 0.0352075 2.61 223.0581 5.716 221.29163 8.165 202.55313 73.661 223.058 5.7161 13MB037C-98 394.32 9533.949 1.716 18.753078 4.94 0.2599508 6.28 0.0353559 3.87 223.98242 8.52 234.62726 13.15 342.61033 111.96 223.982 8.5201 13MB037C-51 545.36 60748.76 19.96 19.475678 2.16 0.2521952 2.21 0.0356228 0.45 225.64381 1.004 228.35782 4.512 256.42034 49.649 225.644 1.004 13MB037C-45 298.77 17378.91 1.645 19.83357 3.67 0.2546912 4.93 0.0366365 3.3 231.95035 7.518 230.37971 10.17 214.40494 84.953 231.95 7.518 13MB037C-07 220.94 11839.31 1.422 19.820842 5.53 0.2563464 6.14 0.0368509 2.68 233.28371 6.14 231.71836 12.73 215.86916 128.04 233.284 6.1398 13MB037C-70 84.648 687.2712 0.987 29.502438 7.61 0.1885303 7.98 0.0403402 2.41 254.94114 6.023 175.37439 12.86 -798.68932 216.1 254.941 6.0231 13MB037C-69 188.09 1287.712 1.279 25.099415 7.67 0.2315624 8.17 0.0421532 2.81 266.16566 7.321 211.48768 15.59 -361.19244 198.64 266.166 7.3207 13MB037C-84 75.025 1107.647 1.112 22.311361 10 0.3021704 10.2 0.0488964 1.95 307.74244 5.869 268.09404 24.03 -65.392952 244.74 307.742 5.8695 13MB037C-06 267.29 21231.2 3.855 19.010026 2.91 0.3681593 3.35 0.0507595 1.67 319.18277 5.2 318.28836 9.165 311.72785 66.206 319.183 5.2 13MB037C-74 719.75 56590.96 4.598 18.967769 0.93 0.3716345 2.07 0.0511247 1.85 321.42311 5.788 320.86419 5.689 316.78631 21.181 321.423 5.788 13MB037C-13 140.3 31720.83 0.83 19.586131 3.36 0.3607975 4.3 0.051252 2.69 322.20363 8.464 312.80996 11.58 243.40557 77.345 322.204 8.4642 13MB037C-41 190.85 11258.74 1.652 19.552793 3.27 0.3617944 3.83 0.0513061 2.01 322.5356 6.314 313.55356 10.34 247.31131 75.239 322.536 6.3143 13MB037C-73 157.42 23523.21 2.803 17.938706 3.49 0.4827077 3.9 0.0628021 1.74 392.64402 6.612 399.9289 12.89 442.21944 77.671 392.644 6.6118 13MB037C-76 213.31 2558.119 30.33 19.530691 2.84 0.471418 3.27 0.0667763 1.62 416.70468 6.552 392.16788 10.63 249.89183 65.295 416.705 6.5517 13MB037C-57 120.67 2025.702 1.047 18.597585 8.03 0.5149249 8.15 0.0694543 1.42 432.8672 5.949 421.75546 28.15 361.42568 181.37 432.867 5.9493 13MB037C-54 228.86 15222.98 1.488 18.294819 2.8 0.5265022 3.41 0.0698597 1.95 435.31063 8.212 429.48565 11.96 398.33161 62.83 435.311 8.2122 13MB037C-97 369.77 77964.52 1.176 17.59537 1.44 0.5800636 2.42 0.074024 1.94 460.35376 8.627 464.50233 9.016 485.08612 31.841 460.354 8.6266 13MB037C-71 129.38 15823.64 3.362 17.640667 2.15 0.6813914 3.04 0.0871787 2.16 538.8299 11.14 527.61502 12.52 479.36296 47.498 538.83 11.143 13MB037C-35 92.138 8942.453 0.68 16.90912 4.43 0.7311707 5.01 0.0896682 2.33 553.57455 12.36 557.24005 21.49 572.26029 96.51 553.575 12.36 13MB037C-83 159.08 14804.37 1.564 15.206113 1.19 1.2448865 2.07 0.1372925 1.7 829.33383 13.24 821.09456 11.67 798.82202 24.867 829.334 13.235 13MB037C-12 270.1 24073.9 4.367 14.407327 0.84 1.3782291 4.95 0.1440136 4.88 867.31856 39.59 879.68333 29.14 910.90469 17.252 867.319 39.594 13MB037C-04 127.62 39674.43 1.219 13.990963 1.15 1.6138627 2.89 0.1637619 2.65 977.64894 24.06 975.60957 18.12 971.00586 23.424 971.006 23.424 13MB037C-40 149.52 37050.63 1.06 13.251398 1.42 1.91701 2.26 0.1842404 1.75 1090.0985 17.56 1087.0276 15.06 1080.8719 28.531 1080.87 28.531 13MB037C-20 72.584 13106.15 0.513 12.851319 2.2 2.0743738 2.7 0.1933452 1.55 1139.4713 16.23 1140.378 18.47 1142.0831 43.791 1142.08 43.791 13MB037C-14 332.14 39550.93 1.055 12.681503 0.71 2.1527401 1.49 0.1979981 1.31 1164.5571 13.97 1165.9359 10.35 1168.4799 14.152 1168.48 14.152 13MB037C-65 454.44 52646.22 25.6 12.633443 0.61 2.2482371 2.33 0.2059978 2.25 1207.4602 24.76 1196.2354 16.37 1176.0305 11.996 1176.03 11.996 13MB037C-08 33.441 8740.434 0.673 12.607792 3.64 2.1591944 4.03 0.1974374 1.72 1161.5394 18.27 1168.0125 27.94 1180.0513 71.998 1180.05 71.998 13MB037C-15 209.11 135391.2 1.948 10.218036 0.42 3.7440931 2.87 0.2774679 2.84 1578.5975 39.71 1580.8502 22.98 1583.8392 7.8414 1583.84 7.8414 13MB037C-11 116.75 21235.58 0.917 10.12654 1.19 3.5921865 4.36 0.2638267 4.2 1509.3902 56.47 1547.8055 34.66 1600.6407 22.251 1600.64 22.251 13MB037C-95 266.87 95264.65 1.69 9.8637462 0.3 4.1217628 3.39 0.2948653 3.37 1665.7963 49.51 1658.6269 27.68 1649.544 5.5626 1649.54 5.5626 13MB037C-96 16.41 1973.505 1.325 9.5990569 3.32 4.549847 10.2 0.3167554 9.63 1773.8644 149.3 1740.1334 84.97 1699.8148 61.139 1699.81 61.139 13MB037C-60 89.976 11442.84 1.52 9.4268239 0.94 3.662577 2.32 0.2504095 2.12 1440.5875 27.3 1563.2516 18.48 1733.0985 17.335 1733.1 17.335 13MB037C-82 34.618 5499.064 0.593 9.1329667 2.23 5.0143994 6.06 0.3321464 5.63 1848.7765 90.53 1821.7561 51.32 1790.9834 40.559 1790.98 40.559 13MB037C-31 18.962 5252.148 0.872 9.1133924 2.71 4.940157 4.34 0.3265273 3.4 1821.5278 53.87 1809.1441 36.68 1794.8907 49.287 1794.89 49.287 13MB037C-34 85.51 20748.69 1.175 9.0038132 0.83 4.9485212 1.33 0.3231474 1.03 1805.0815 16.28 1810.5728 11.2 1816.885 15.075 1816.88 15.075 13MB037C-72 192.47 69162.36 4.007 8.9817534 0.28 5.1382568 1.58 0.3347154 1.56 1861.1962 25.15 1842.454 13.43 1821.3342 5.0065 1821.33 5.0065 13MB037C-02 105.07 141507.1 0.659 8.9437791 0.78 4.1429447 2.72 0.2687379 2.61 1534.3925 35.65 1662.8175 22.28 1829.0196 14.056 1829.02 14.056 13MB037C-17 123.63 108667.7 2.736 8.8820023 0.4 5.0884224 1.85 0.3277878 1.81 1827.6502 28.78 1834.1768 15.71 1841.5767 7.1649 1841.58 7.1649 13MB037C-89 121.28 8400.998 1.213 8.7898669 0.48 5.3268968 1.27 0.3395903 1.18 1884.6984 19.26 1873.1887 10.88 1860.428 8.6751 1860.43 8.6751 13MB037C-30 319.72 126176.5 5.143 8.7614522 0.24 5.25102 1.21 0.333671 1.19 1856.1503 19.22 1860.9379 10.36 1866.2741 4.2434 1866.27 4.2434 13MB037C-53 531.54 339863.6 1.508 8.7491527 0.17 5.4816074 2.96 0.3478345 2.95 1924.2496 49.1 1897.719 25.39 1868.8093 3.1135 1868.81 3.1135 13MB037C-75 253.16 66644.69 2.905 8.7417953 0.24 4.8090482 1.44 0.3049007 1.42 1715.5647 21.34 1786.4819 12.07 1870.3271 4.2772 1870.33 4.2772 13MB037C-56 242.6 184740.8 3.841 8.7321921 0.28 5.447108 1.37 0.3449753 1.35 1910.5601 22.26 1892.3 11.79 1872.3098 5.0368 1872.31 5.0368 13MB037C-16 186.02 44091.5 2.555 8.7101756 0.6 4.5791121 9.07 0.2892723 9.05 1637.8919 131 1745.4736 75.75 1876.8616 10.738 1876.86 10.738 13MB037C-29 131.37 67050.54 1.774 8.692918 0.32 5.4131542 1.99 0.341283 1.97 1892.839 32.24 1886.9383 17.07 1880.4359 5.7532 1880.44 5.7532 13MB037C-21 193.84 52197.92 2.6 8.6921814 0.44 5.1917875 3.98 0.3272988 3.96 1825.2758 62.89 1851.2706 33.91 1880.5886 7.9774 1880.59 7.9774 13MB037C-05 123.51 43129.3 3.662 8.6917415 0.65 5.4414136 4.02 0.3430183 3.97 1901.1734 65.34 1891.4028 34.51 1880.6798 11.718 1880.68 11.718 13MB037C-44 181.59 142884.4 1.327 8.6892165 0.29 5.4257774 1.5 0.3419332 1.47 1895.9632 24.19 1888.935 12.87 1881.2032 5.3003 1881.2 5.3003 13MB037C-33 132.84 55381.21 2.073 8.6818368 0.52 5.3966924 2.43 0.3398114 2.37 1885.7624 38.75 1884.3286 20.79 1882.7339 9.3191 1882.73 9.3191 13MB037C-58 154.83 77719.25 4.133 8.6806776 0.36 5.6152131 2.07 0.3535238 2.04 1951.4029 34.36 1918.4363 17.86 1882.9744 6.4137 1882.97 6.4137 13MB037C-47 198.61 227032.9 3.609 8.6740453 0.38 5.6059773 2.76 0.3526726 2.73 1947.348 45.87 1917.0177 23.75 1884.351 6.8735 1884.35 6.8735 13MB037C-92 644.7 100697.9 20.63 8.6725855 0.13 5.3796726 1.89 0.3383788 1.88 1878.8657 30.69 1881.6234 16.16 1884.6541 2.3147 1884.65 2.3147 13MB037C-49 353.09 160089.4 3.571 8.6606982 0.19 5.5590397 1.81 0.3491816 1.8 1930.6896 30.11 1909.7773 15.61 1887.1239 3.3391 1887.12 3.3391 13MB037C-38 153.11 153687.3 4.389 8.6452641 0.24 5.4315115 2.4 0.3405632 2.39 1889.3783 39.14 1889.8407 20.59 1890.3346 4.2607 1890.33 4.2607 13MB037C-55 109.59 120561.5 2.738 8.6430928 0.27 5.6014083 1.36 0.3511277 1.33 1939.9813 22.32 1916.3152 11.72 1890.7827 4.9139 1890.78 4.9139 13MB037C-86 231.92 48418.12 2.19 8.6344536 0.2 5.6333225 2.92 0.3527753 2.92 1947.8374 49.02 1921.2122 25.21 1892.5822 3.5666 1892.58 3.5666 13MB037C-91 217.74 88402.7 5.166 8.6288045 0.18 5.5152767 1.77 0.345157 1.77 1911.4309 29.2 1902.9798 15.25 1893.7597 3.2673 1893.76 3.2673 13MB037C-99 526 268341.2 2.617 8.6111151 0.2 5.5591685 1.48 0.3471906 1.47 1921.1693 24.42 1909.7973 12.77 1897.4506 3.574 1897.45 3.574 13MB037C-01 395.72 333522.2 7.141 8.5392896 0.15 5.6946997 2.63 0.3526885 2.63 1947.4236 44.14 1930.5642 22.72 1912.4985 2.7795 1912.5 2.7795 13MB037C-37 90.235 40804.19 0.817 8.0487625 0.45 6.0999 2.38 0.3560824 2.33 1963.5776 39.52 1990.2327 20.75 2018.0157 8.0059 2018.02 8.0059 13MB037C-79 429.04 52082.55 0.49 7.8321904 0.97 6.5661585 4.29 0.3729867 4.18 2043.4387 73.15 2054.8159 37.79 2066.2355 17.024 2066.24 17.024 13MB037C-24 118.73 61835.35 2.414 7.5276674 0.29 7.4859369 2.38 0.4087006 2.37 2208.9782 44.27 2171.3056 21.36 2135.873 5.0177 2135.87 5.0177 13MB037C-62 139.19 85557.8 0.933 7.4761247 0.31 7.1729139 0.43 0.3889295 0.3 2117.8618 5.355 2133.1426 3.842 2147.8842 5.4641 2147.88 5.4641 13MB037C-22 234.36 77481.9 1.391 7.4527683 0.6 7.1060444 3.86 0.3841 3.81 2095.4074 68.13 2124.8007 34.33 2153.3446 10.47 2153.34 10.47 13MB037C-100 256.61 356512.2 1.153 7.2961532 0.13 7.9030525 1.41 0.4182034 1.41 2252.3181 26.71 2220.0276 12.72 2190.3461 2.2264 2190.35 2.2264 13MB037C-39 251.95 131144.9 1.365 7.037607 0.23 8.4364129 3.13 0.4306075 3.12 2308.4555 60.56 2279.1044 28.41 2252.8658 3.9491 2252.87 3.9491 13MB037C-48 167.58 58530.85 1.462 6.6098009 1.48 8.2942422 4.82 0.397616 4.58 2158.0526 84.07 2263.69 43.68 2360.5488 25.323 2360.55 25.323 13MB037C-67 239.29 16740.7 2.124 6.1914233 0.33 10.460053 2.84 0.4697028 2.82 2482.2573 58.02 2476.3846 26.29 2471.5529 5.6115 2471.55 5.6115 13MB037C-88 161.72 76490.95 1.771 6.0906221 0.15 11.087152 2.04 0.4897567 2.04 2569.6233 43.2 2530.4798 19.04 2499.228 2.4961 2499.23 2.4961 13MB037C-03 35.994 20192.89 1.075 5.6407386 0.71 12.593006 2.69 0.5151861 2.59 2678.7316 56.87 2649.6983 25.3 2627.5922 11.724 2627.59 11.724 13MB037C-43 178.92 116103.9 2.357 5.3057262 3.69 13.662021 7.12 0.5257248 6.08 2723.4141 135.1 2726.568 67.44 2728.8949 60.863 2728.89 60.863 13MB037C-36 53.288 46428.02 1.439 4.9060585 0.86 16.333367 9 0.5811753 8.96 2953.5436 212.4 2896.5156 86.35 2857.0974 14.061 2857.1 14.061 13MB037C-61 266.03 234710.3 3.98 4.3012128 1.06 15.643385 2.34 0.4880006 2.09 2562.02 44.21 2855.2702 22.38 3069.2752 16.937 3069.28 16.937

147 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB043 13MB043-136 504.35 43487.17 0.645 21.69571 3.71 0.0432756 4.73 0.0068095 2.94 43.748145 1.281 43.01711 1.992 2.4251025 89.294 43.7481 1.2806 13MB043-179 278.49 13900.42 0.931 21.982286 5.33 0.0438263 6.1 0.0069873 2.96 44.886135 1.325 43.552971 2.599 29.251047 129.23 44.8861 1.325 13MB043-208 1109.6 82386.31 1.583 18.089017 1.83 0.2325113 3.7 0.0305041 3.21 193.70228 6.13 212.26967 7.079 423.63201 40.771 193.702 6.1299 13MB043-200 1265.3 30806.52 2.546 15.442427 1.92 0.2833812 2.91 0.0317384 2.19 201.4193 4.336 253.33621 6.53 766.42038 40.533 201.419 4.3365 13MB043-216 731.48 280594.5 1.969 19.885918 1.96 0.2221893 3.46 0.0320455 2.84 203.33787 5.693 203.73026 6.381 208.29538 45.578 203.338 5.6934 13MB043-185 700.76 175772.6 2.834 19.61228 2.14 0.2281183 2.84 0.0324479 1.87 205.8508 3.791 208.6441 5.357 240.30751 49.252 205.851 3.7913 13MB043-309 1158.2 45082.53 1.51 19.732884 1.89 0.2294757 3.17 0.0328417 2.54 208.30921 5.212 209.7658 6.006 226.16294 43.715 208.309 5.2117 13MB043-252 650.48 72857.46 1.428 19.523064 1.66 0.2328313 3.17 0.0329676 2.7 209.09507 5.546 212.53324 6.075 250.78643 38.301 209.095 5.5456 13MB043-115 539.04 69592.23 1.836 19.07472 2.73 0.2386075 3.9 0.0330097 2.78 209.35718 5.724 217.27952 7.621 304.00049 62.235 209.357 5.7238 13MB043-195 712.35 80832.4 1.752 19.932533 1.85 0.2295089 3.94 0.0331788 3.48 210.41271 7.195 209.79321 7.464 202.83544 42.96 210.413 7.1948 13MB043-192 711.48 163047.5 2.215 19.605105 1.67 0.2333553 3.23 0.0331807 2.76 210.42452 5.718 212.96475 6.2 241.14934 38.491 210.425 5.7178 13MB043-206 822.43 58790.55 4.849 19.662303 1.55 0.2331019 4.43 0.0332414 4.15 210.80304 8.601 212.75612 8.498 234.45464 35.772 210.803 8.6006 13MB043-215 827.71 157961.2 2.353 18.96195 1.88 0.2417372 2.33 0.0332449 1.37 210.82513 2.832 219.84195 4.597 317.48443 42.803 210.825 2.8319 13MB043-231 561.56 62069.13 1.445 19.780033 2.64 0.2319521 3.19 0.0332755 1.8 211.01571 3.731 211.80888 6.107 220.65762 61.117 211.016 3.7308 13MB043-171 596.49 136395.4 2.225 19.470981 1.85 0.2359386 2.59 0.0333185 1.81 211.28434 3.766 215.08932 5.015 256.96021 42.451 211.284 3.7656 13MB043-181 644.46 45567.07 1.473 19.925023 2.46 0.230689 4.41 0.0333368 3.66 211.39864 7.605 210.76728 8.393 203.69417 57.171 211.399 7.6053 13MB043-225 905.64 71203.57 3.211 20.01991 2.07 0.2296448 3.34 0.033344 2.62 211.44321 5.449 209.90541 6.328 192.703 48.075 211.443 5.4489 13MB043-182 631.57 76694.6 3.931 20.385675 2.21 0.2256487 3.26 0.0333624 2.39 211.55783 4.974 206.60027 6.088 150.39346 51.849 211.558 4.9737 13MB043-162 713 85845.07 2.841 19.577931 1.91 0.235123 2.99 0.0333857 2.29 211.70351 4.776 214.41899 5.775 244.35976 44.099 211.704 4.7762 13MB043-300 921.78 200118.2 2.384 19.944353 2.3 0.230827 3.54 0.0333891 2.69 211.72493 5.598 210.88114 6.737 201.46369 53.428 211.725 5.5977 13MB043-122 949.32 169734.4 3.364 19.092094 2.49 0.2412985 3.74 0.0334123 2.79 211.86966 5.812 219.4832 7.378 301.93679 56.762 211.87 5.8117 13MB043-303 656.4 52235.6 1.989 19.384503 2 0.2381905 2.72 0.0334871 1.85 212.33608 3.867 216.93761 5.319 267.17403 45.827 212.336 3.8667 13MB043-176 753.63 84603.88 2.128 19.502923 1.79 0.2367676 3.08 0.0334904 2.5 212.35672 5.233 215.77011 5.987 253.19257 41.221 212.357 5.2328 13MB043-143 851.52 118754.4 1.886 20.136222 2.34 0.2293437 3.58 0.0334937 2.72 212.37732 5.673 209.65673 6.786 179.16973 54.486 212.377 5.6733 13MB043-196 480.8 40515.92 2.169 19.487378 2.02 0.2373324 8.03 0.0335436 7.78 212.68812 16.27 216.23369 15.65 255.00183 46.371 212.688 16.268 13MB043-197 854.78 186243.5 0.956 20.133938 1.97 0.2302135 3.07 0.0336169 2.35 213.14582 4.932 210.37489 5.828 179.43376 45.887 213.146 4.9317 13MB043-178 616.32 65016.51 1.95 20.008306 2.17 0.2316921 2.91 0.0336217 1.93 213.17576 4.051 211.59455 5.549 194.04986 50.437 213.176 4.0512 13MB043-257 1147.1 124053.3 2.757 19.118922 1.89 0.242603 4.51 0.0336402 4.09 213.29076 8.578 220.54973 8.933 298.7093 43.205 213.291 8.5783 13MB043-220 1225.9 119799.3 2.865 19.730451 1.6 0.2351223 4.57 0.0336457 4.29 213.32516 8.992 214.41843 8.842 226.46206 37.021 213.325 8.9915 13MB043-263 556.49 70243.4 2.348 19.408902 2.36 0.2392822 3.39 0.0336829 2.43 213.55743 5.106 217.83247 6.64 264.30847 54.136 213.557 5.1058 13MB043-134 339.34 83449.35 3.923 19.636566 2.15 0.2370352 3.44 0.033758 2.69 214.02574 5.656 215.98983 6.695 237.47764 49.612 214.026 5.6561 13MB043-132 774.12 203241.8 1.801 20.30092 1.78 0.2293248 3.12 0.0337649 2.57 214.06857 5.404 209.64117 5.913 160.16526 41.557 214.069 5.4038 13MB043-316 705.18 41198.19 2.313 19.571692 1.86 0.23813 2.85 0.0338019 2.16 214.29932 4.557 216.88804 5.565 245.0601 42.758 214.299 4.557 13MB043-191 684.45 236464.8 3.323 19.360354 1.82 0.2410404 3.36 0.0338456 2.83 214.57159 5.97 219.27205 6.629 270.01021 41.61 214.572 5.9703 13MB043-114 789.32 112618.1 1.625 20.194715 2.32 0.2311249 3.57 0.0338519 2.72 214.61107 5.739 211.12685 6.811 172.40389 54.101 214.611 5.739 13MB043-144 755.28 183315.3 2.665 20.164193 1.81 0.2315487 3.28 0.0338627 2.74 214.67853 5.778 211.47635 6.267 175.93273 42.301 214.679 5.778 13MB043-170 600.4 100183.4 1.459 19.916033 2.39 0.2346355 3.79 0.0338919 2.94 214.86015 6.214 214.01818 7.315 204.78547 55.512 214.86 6.2136 13MB043-210 445.89 52643.42 2.856 20.394943 2.37 0.2293173 3.99 0.0339202 3.21 215.03669 6.785 209.63492 7.558 149.36821 55.623 215.037 6.7846 13MB043-302 930.28 57544.81 2.246 18.687368 1.56 0.250791 3.08 0.0339906 2.65 215.47583 5.613 227.21855 6.261 350.56804 35.302 215.476 5.6134 13MB043-128 781.86 64477.36 2.799 19.986919 2.71 0.2345324 5.76 0.0339975 5.08 215.51902 10.76 213.93334 11.11 196.53658 63.064 215.519 10.764 13MB043-173 529.45 125471.9 2.288 19.316571 1.64 0.2433561 3.16 0.0340935 2.7 216.117 5.744 221.16488 6.283 275.1986 37.569 216.117 5.7438 13MB043-158 1087.8 212812.5 1.119 19.716397 1.89 0.2391541 2.71 0.0341983 1.94 216.77037 4.136 217.72752 5.306 228.08493 43.642 216.77 4.1355 13MB043-299 1290.9 95350.42 2.876 19.233134 2.06 0.2453698 5.86 0.0342271 5.49 216.95001 11.71 222.80807 11.73 285.14159 47.184 216.95 11.708 13MB043-320 924.75 102269.9 2.288 19.607442 2.5 0.2409536 4.18 0.0342652 3.35 217.18745 7.152 219.20098 8.236 240.8992 57.576 217.187 7.1515 13MB043-168 361.22 29985.21 1.73 18.349842 4.38 0.2575668 6.34 0.0342784 4.59 217.27006 9.808 232.70422 13.19 391.5966 98.264 217.27 9.8084 13MB043-294 278.41 356367.5 3.234 19.701592 2.43 0.2405207 3.64 0.0343679 2.72 217.82737 5.821 218.8467 7.171 229.80227 56.026 217.827 5.8209 13MB043-194 1464.5 35514.72 1.757 15.671277 2.08 0.3029456 3.75 0.0344324 3.12 218.22984 6.704 268.69831 8.861 735.39325 44.018 218.23 6.7045 13MB043-246 529.4 33880 1.531 20.171215 2.31 0.2358647 3.44 0.0345059 2.56 218.68783 5.498 215.02858 6.675 175.12037 53.837 218.688 5.4978 13MB043-312 489.22 47371.5 3.875 19.894469 2.53 0.2391677 3.62 0.0345091 2.6 218.70754 5.585 217.73866 7.1 207.25465 58.589 218.708 5.5851 13MB043-242 1053.9 102603.4 2.712 19.926897 1.69 0.2388276 3.29 0.0345162 2.82 218.75179 6.067 217.45996 6.434 203.47754 39.157 218.752 6.0675 13MB043-127 938.87 80991.43 1.578 20.076856 1.86 0.2371316 3.23 0.034529 2.64 218.83155 5.684 216.06894 6.287 186.04892 43.271 218.832 5.6839 13MB043-323 727.5 56074.2 2.241 20.16461 2.33 0.2362172 3.38 0.0345462 2.45 218.93869 5.269 215.31817 6.557 175.88459 54.353 218.939 5.2686 13MB043-203 907.11 203965.3 2.463 19.731783 1.41 0.2415015 2.54 0.0345609 2.11 219.03033 4.546 219.64926 5.015 226.26361 32.599 219.03 4.5457 13MB043-126 506.54 76653.75 2.219 19.888015 2.02 0.2396469 3.84 0.034567 3.27 219.06851 7.04 218.13127 7.547 208.0065 46.947 219.069 7.0402 13MB043-212 1108.2 112632.7 2.369 19.392719 1.71 0.246005 2.94 0.0346004 2.39 219.27658 5.158 223.32579 5.893 266.21187 39.2 219.277 5.1579 13MB043-284 782.44 106699 2.074 20.239501 2.11 0.2370339 3.1 0.0347944 2.27 220.48495 4.913 215.9887 6.031 167.23157 49.419 220.485 4.913 13MB043-272 1330.5 203048.9 2.922 20.025669 1.68 0.239881 2.77 0.0348403 2.2 220.77098 4.783 218.32302 5.447 192.03287 39.115 220.771 4.7831 13MB043-283 629.78 137680.5 2.624 19.558455 2.1 0.2458145 2.89 0.0348691 1.99 220.95049 4.319 223.17055 5.792 246.61831 48.351 220.95 4.3188 13MB043-145 391 41534.78 2.229 20.187547 2.58 0.2386533 3.79 0.0349422 2.77 221.40559 6.026 217.31712 7.409 173.23234 60.307 221.406 6.026 13MB043-262 529.89 374821.9 2.338 19.472002 2.29 0.2477856 4.27 0.0349933 3.61 221.72439 7.871 224.77584 8.62 256.8235 52.565 221.724 7.8711 13MB043-298 260.19 33920.75 2.285 19.191636 2.53 0.252531 3.23 0.03515 2.01 222.70007 4.408 228.63004 6.613 290.08296 57.717 222.7 4.4077 13MB043-244 542.33 46624.97 2.355 19.653977 2.11 0.2488911 3.7 0.035478 3.04 224.74207 6.706 225.67504 7.486 235.43244 48.781 224.742 6.7062 13MB043-224 296.07 61853.2 2.34 19.839767 2.47 0.2473766 3.65 0.0355954 2.68 225.4732 5.945 224.44294 7.347 213.68131 57.257 225.473 5.9454 13MB043-324 441.07 52484.62 1.113 20.177518 2.19 0.247158 3.35 0.0361694 2.53 229.04519 5.689 224.26501 6.732 174.39273 51.155 229.045 5.6886 13MB043-207 175.25 50761.53 1.759 19.338265 2.28 0.2774987 3.34 0.0389204 2.44 246.13751 5.883 248.67137 7.36 272.62713 52.263 246.138 5.8829 13MB043-270 307.92 172905.8 1.133 19.313626 2.21 0.2790634 3.49 0.03909 2.7 247.18971 6.555 249.91426 7.739 275.5486 50.695 247.19 6.5554 13MB043-202 380.78 95312.5 1.809 19.702229 1.69 0.2740992 3.36 0.0391671 2.9 247.66847 7.042 245.96584 7.33 229.72778 39.022 247.668 7.0424 13MB043-266 430.62 42901.67 1.428 19.534912 2.47 0.2883882 3.82 0.040859 2.91 258.15522 7.361 257.28993 8.674 249.40838 56.854 258.155 7.3608 13MB043-156 85.794 29413.69 2.736 19.316715 3.91 0.3027701 4.37 0.0424175 1.97 267.80036 5.157 268.56158 10.32 275.18158 89.489 267.8 5.1565 13MB043-235 368.48 83933.05 0.939 19.418809 2.53 0.3075237 3.78 0.0433112 2.8 273.32459 7.502 272.25981 9.019 263.10265 58.128 273.325 7.5016 13MB043-318 288.22 25254 2.224 19.847954 2.39 0.3014175 3.73 0.0433893 2.86 273.80748 7.669 267.50678 8.771 212.67997 55.443 273.807 7.6685 13MB043-264 41.847 11866.45 0.984 21.559354 5.21 0.2836084 5.96 0.0443459 2.89 279.71481 7.911 253.51592 13.36 17.581897 125.16 279.715 7.9105 13MB043-233 352.61 46430.48 5.337 18.860565 1.84 0.3461744 3.49 0.0473531 2.96 298.2506 8.626 301.83968 9.106 329.68949 41.84 298.251 8.6262 13MB043-227 84.331 13505.45 1.022 19.440236 2.96 0.3487642 3.69 0.0491736 2.2 309.44608 6.65 303.7912 9.693 260.6057 68.075 309.446 6.6496 13MB043-130 71.887 126914.1 2.767 18.827716 3.39 0.3673496 4.18 0.0501621 2.45 315.5169 7.538 317.68724 11.41 333.62766 76.846 315.517 7.5376 13MB043-135 421.63 130345.6 1.438 18.615983 1.88 0.3792766 3.68 0.0512084 3.17 321.93595 9.946 326.50575 10.29 359.19327 42.497 321.936 9.9461

148 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB043-260 473.23 151617.3 1.465 18.415043 2.13 0.461059 3.52 0.0615783 2.8 385.21708 10.45 384.99418 11.27 383.63347 47.926 385.217 10.454 13MB043-148 202.61 78524.75 1.304 17.590384 2.65 0.4926972 4.52 0.0628571 3.66 392.97749 13.97 406.7469 15.15 485.66882 58.538 392.977 13.965 13MB043-250 1484.2 65441.44 34.78 17.849152 1.65 0.5121857 2.73 0.0663046 2.17 413.85363 8.698 419.91787 9.384 453.34126 36.738 413.854 8.698 13MB043-230 713.74 211452.4 1.277 17.796205 2.04 0.5342331 3.35 0.0689536 2.66 429.84834 11.07 434.61507 11.85 459.94435 45.172 429.848 11.069 13MB043-308 111.67 32771.39 0.945 18.062051 2.84 0.5375489 3.34 0.070418 1.76 438.6736 7.468 436.80717 11.87 426.95919 63.423 438.674 7.4681 13MB043-166 372.18 131048.1 3.209 18.096344 2.1 0.5372967 3.35 0.0705186 2.62 439.27938 11.11 436.6406 11.9 422.72668 46.795 439.279 11.112 13MB043-237 188.19 188771.8 1.146 17.822001 3.54 0.5560554 4.45 0.0718742 2.7 447.43746 11.65 448.95568 16.16 456.73315 78.662 447.437 11.652 13MB043-317 181.75 30547.11 2.729 17.521451 2.18 0.595984 5.19 0.0757362 4.71 470.62202 21.36 474.68187 19.67 494.34843 48.071 470.622 21.36 13MB043-297 815.65 70010.97 2.779 17.388676 2.03 0.6374137 4.98 0.0803871 4.54 498.43318 21.79 500.70364 19.67 511.07399 44.73 498.433 21.787 13MB043-329 627.08 119456 19.82 14.773829 2.86 1.1303933 7.33 0.1211215 6.75 737.01567 47.01 767.9409 39.51 858.97261 59.361 737.016 47.014 13MB043-111 37.508 25918.6 1.671 15.842658 3.76 1.0552396 4.98 0.1212489 3.27 737.74804 22.81 731.47429 25.98 712.30875 79.831 737.748 22.809 13MB043-285 57.46 45017.43 0.851 15.530423 2.88 1.1101653 3.7 0.125046 2.31 759.54154 16.55 758.25382 19.74 754.43821 60.893 759.542 16.555 13MB043-321 219.38 167264.2 0.375 15.507436 1.29 1.1164249 3.04 0.1255649 2.76 762.51438 19.82 761.26142 16.3 757.5633 27.16 762.514 19.821 13MB043-291 132.78 53269 1.644 15.563585 1.94 1.1171561 3.44 0.1261021 2.85 765.59018 20.54 761.61213 18.45 749.935 40.984 765.59 20.541 13MB043-236 266.76 113838.9 1.148 15.40632 1.7 1.1352423 3.35 0.1268488 2.89 769.86315 20.98 770.2494 18.11 771.34936 35.736 769.863 20.985 13MB043-295 1220.5 115404.1 3.21 15.46887 1.85 1.1422609 3.75 0.1281512 3.26 777.30973 23.89 773.58153 20.31 762.81561 39.006 777.31 23.893 13MB043-222 25.225 34761.03 1.48 15.19484 3.79 1.1794285 4.3 0.129977 2.04 787.73424 15.13 791.04707 23.66 800.37599 79.443 787.734 15.132 13MB043-304 201.25 246121.3 0.377 15.237759 2.23 1.1857617 3.06 0.131044 2.1 793.81872 15.68 793.99337 16.86 794.46383 46.747 793.819 15.675 13MB043-214 179.13 265117.2 1.669 14.98444 2.2 1.2147107 3.07 0.1320116 2.15 799.33107 16.18 807.3532 17.12 829.55534 45.781 799.331 16.18 13MB043-125 715.82 203048.4 3.256 14.484523 1.64 1.4131659 4.31 0.1484554 3.98 892.29927 33.2 894.49106 25.63 899.89244 33.814 892.299 33.204 13MB043-286 260.38 187819.3 2.434 13.94473 1.71 1.6011993 2.68 0.16194 2.06 967.54904 18.5 970.67837 16.74 977.77659 34.856 977.777 34.856 13MB043-243 102.46 98001.76 0.551 13.75378 2.5 1.6172027 3.21 0.1613189 2.02 964.1021 18.11 976.9062 20.16 1005.7856 50.694 1005.79 50.694 13MB043-137 116.85 28110.55 1.299 13.609522 4.4 1.387498 6.23 0.1369538 4.42 827.41368 34.29 883.633 36.8 1027.147 89.043 1027.15 89.043 13MB043-248 408.74 78192.01 2.307 13.10674 1.53 1.9796495 5.3 0.1881836 5.08 1111.5277 51.83 1108.601 35.77 1102.8518 30.488 1102.85 30.488 13MB043-177 281.56 142642.4 1.659 12.664137 1.57 2.0869216 2.96 0.1916816 2.5 1130.4782 25.97 1144.5137 20.31 1171.229 31.161 1171.23 31.161 13MB043-256 139.15 155265.9 3.284 12.464752 1.71 2.3058899 2.82 0.2084591 2.24 1220.6035 24.95 1214.0993 19.99 1202.5413 33.77 1202.54 33.77 13MB043-159 98.744 100986.7 1.42 12.391363 1.96 2.3323684 3.84 0.2096114 3.31 1226.7473 36.92 1222.1996 27.33 1214.1646 38.602 1214.16 38.602 13MB043-290 168.47 50379.06 1.84 11.745742 1.68 2.7460583 2.91 0.2339316 2.37 1355.0718 28.98 1341.0206 21.64 1318.6496 32.601 1318.65 32.601 13MB043-193 743.84 1169306 2.112 11.737444 1.12 2.5747929 2.73 0.2191869 2.48 1277.577 28.78 1293.5038 19.94 1320.0189 21.799 1320.02 21.799 13MB043-313 251.99 56126.99 2.633 11.145771 1.61 3.1013354 3.06 0.2507019 2.61 1442.0943 33.71 1433.0229 23.52 1419.5608 30.683 1419.56 30.683 13MB043-121 234.52 86949.15 1.838 10.573354 1.54 3.3603993 4.94 0.2576928 4.7 1478.0272 62.02 1495.2161 38.69 1519.6518 29.07 1519.65 29.07 13MB043-326 222.54 89480.62 1.696 9.6242512 1.62 4.4623934 3.11 0.3114824 2.65 1747.9975 40.65 1724.0057 25.82 1694.9842 29.926 1694.98 29.926 13MB043-282 18.562 53022.28 0.998 9.481483 1.88 4.2848082 3.42 0.29465 2.85 1664.7243 41.87 1690.4466 28.16 1722.4844 34.609 1722.48 34.609 13MB043-149 66.131 86292.53 1.569 9.4696007 2.52 4.5938847 3.65 0.3155081 2.64 1767.7548 40.83 1748.1586 30.46 1724.7878 46.326 1724.79 46.326 13MB043-147 379.83 187276.4 1.004 9.4575135 1.53 3.7876714 3.22 0.2598053 2.83 1488.8456 37.64 1590.1347 25.86 1727.1331 28.067 1727.13 28.067 13MB043-124 50.973 97840.58 1.691 9.3167183 1.87 4.614329 5.07 0.3117958 4.72 1749.5377 72.26 1751.8628 42.37 1754.621 34.258 1754.62 34.258 13MB043-123 160.88 66580.74 2.564 9.0648773 1.47 4.7666994 3.17 0.3133852 2.81 1757.3434 43.25 1779.0525 26.62 1804.603 26.657 1804.6 26.657 13MB043-292 112.1 64261.94 2.586 9.0392783 1.64 5.0093345 2.81 0.3284071 2.28 1830.6562 36.31 1820.9006 23.77 1809.7439 29.806 1809.74 29.806 13MB043-138 1292.7 1069401 4.975 9.0281113 1.57 5.1856039 2.53 0.3395431 1.98 1884.4714 32.43 1850.256 21.57 1811.9901 28.609 1811.99 28.609 13MB043-253 196.8 658853.8 1.199 8.9756454 1.36 5.234541 2.97 0.3407556 2.64 1890.3036 43.33 1858.2576 25.36 1822.5687 24.698 1822.57 24.698 13MB043-314 129.83 195512.4 1.831 8.9198744 1.73 5.0290616 2.9 0.3253452 2.32 1815.7806 36.69 1824.2284 24.53 1833.8705 31.435 1833.87 31.435 13MB043-288 869.16 314121.3 2.031 8.9181962 1.64 5.173531 3.54 0.3346284 3.13 1860.7762 50.63 1848.2723 30.11 1834.2115 29.764 1834.21 29.764 13MB043-322 121.64 183190.5 2.363 8.9126582 1.07 5.0679365 4.52 0.3275949 4.39 1826.7137 69.83 1830.7545 38.33 1835.3369 19.321 1835.34 19.321 13MB043-116 355.53 113487.8 3.916 8.9097549 1.38 4.5163453 3.28 0.2918446 2.97 1650.7403 43.26 1733.9854 27.25 1835.9271 25.083 1835.93 25.083 13MB043-172 387.81 240832.7 2.658 8.8939541 1.38 5.0351334 2.51 0.3247915 2.1 1813.0866 33.18 1825.2505 21.3 1839.142 25.052 1839.14 25.052 13MB043-184 1662.8 369534.9 6.006 8.8917363 1.51 5.1419232 3.98 0.3315972 3.68 1846.1186 59.16 1843.0603 33.87 1839.5936 27.373 1839.59 27.373 13MB043-219 264.73 189791 4.346 8.8735602 1.58 5.0427006 2.7 0.3245337 2.2 1811.8322 34.72 1826.5228 22.92 1843.2979 28.515 1843.3 28.515 13MB043-119 227.33 90556.46 2.731 8.8728751 1.82 5.2565563 4.25 0.3382707 3.85 1878.345 62.66 1861.8367 36.3 1843.4377 32.873 1843.44 32.873 13MB043-153 371.38 524102.5 5.852 8.8688811 1.95 5.1968044 3.13 0.334275 2.45 1859.0691 39.54 1852.0929 26.65 1844.2525 35.242 1844.25 35.242 13MB043-146 255.5 332420.2 3.04 8.8562984 1.97 5.0720917 4.71 0.3257902 4.28 1817.9448 67.85 1831.4496 40.01 1846.8214 35.649 1846.82 35.649 13MB043-276 192.84 126411.2 1.969 8.8411903 1.83 5.3547123 3.26 0.3433568 2.69 1902.7979 44.37 1877.6429 27.88 1849.9097 33.14 1849.91 33.14 13MB043-311 151.15 71694.77 1.2 8.8405903 1.74 5.4405832 3.47 0.3488393 3 1929.0538 50.09 1891.2719 29.78 1850.0324 31.451 1850.03 31.451 13MB043-117 369.79 136628.2 4.147 8.8193659 1.7 5.0278891 5.65 0.3216043 5.39 1797.559 84.57 1824.031 47.92 1854.3743 30.808 1854.37 30.808 13MB043-163 297.29 171886.9 7.999 8.8128358 1.87 4.7112199 7.25 0.3011257 7.01 1696.8882 104.6 1769.2366 60.83 1855.7131 33.848 1855.71 33.848 13MB043-330 144.7 117752.8 2.176 8.8096868 1.82 5.3031624 3.85 0.3388396 3.39 1881.0846 55.3 1869.3725 32.86 1856.3589 32.802 1856.36 32.802 13MB043-204 214.61 51904.89 3.115 8.804169 1.48 5.1426092 4.42 0.3283754 4.16 1830.5024 66.32 1843.1737 37.57 1857.491 26.789 1857.49 26.789 13MB043-226 289.88 12390302 1.31 8.7884013 0.87 5.3828277 2.24 0.3430987 2.07 1901.5595 34.07 1882.1254 19.22 1860.7292 15.725 1860.73 15.725 13MB043-307 1404.2 557138.7 7.338 8.7842776 1.55 5.0525534 4.1 0.3218961 3.8 1798.9823 59.62 1828.1771 34.78 1861.5768 27.934 1861.58 27.934 13MB043-289 397.66 192678.2 3.986 8.7825687 1.43 5.2732383 2.88 0.3358905 2.5 1866.8692 40.57 1864.5405 24.62 1861.9282 25.867 1861.93 25.867 13MB043-142 440.17 120246.1 1.815 8.7808428 2.07 5.1950025 7.15 0.330842 6.85 1842.4616 109.8 1851.7977 61 1862.2831 37.412 1862.28 37.412 13MB043-249 265.81 59093.21 0.878 8.7801186 1.53 5.4046419 2.98 0.3441645 2.56 1906.6727 42.21 1885.5897 25.54 1862.432 27.642 1862.43 27.642 13MB043-241 489.83 80360.03 10.81 8.776194 1.47 5.2044006 2.45 0.3312651 1.95 1844.5104 31.36 1853.3369 20.84 1863.2393 26.543 1863.24 26.543 13MB043-150 583.58 243205 1.845 8.7680551 2.31 5.0702546 3.51 0.3224273 2.64 1801.5722 41.49 1831.1424 29.74 1864.9143 41.659 1864.91 41.659 13MB043-183 768.24 293794.3 5.275 8.7558248 1.75 4.925367 2.6 0.3127767 1.93 1754.3562 29.59 1806.6128 21.96 1867.4337 31.548 1867.43 31.548 13MB043-175 437.62 389043.6 4.725 8.7523389 1.99 5.0507362 3.45 0.3206104 2.82 1792.7092 44.14 1827.8722 29.25 1868.1523 35.864 1868.15 35.864 13MB043-228 398.45 86049.21 0.615 8.7504157 1.91 5.5242893 3.88 0.3505935 3.38 1937.4318 56.48 1904.3834 33.36 1868.5488 34.476 1868.55 34.476 13MB043-189 991.76 449709.9 7.299 8.7404973 1.93 5.3051673 3.49 0.3363055 2.91 1868.8716 47.23 1869.6954 29.85 1870.595 34.816 1870.6 34.816 13MB043-205 182.76 138622.8 3.383 8.7389279 1.27 4.9514097 3.69 0.3138237 3.47 1759.4955 53.39 1811.0658 31.21 1870.9189 22.953 1870.92 22.953 13MB043-280 140.29 102950.7 0.6 8.7241244 1.99 5.3558288 3.95 0.338881 3.41 1881.2842 55.7 1877.8213 33.83 1873.9767 35.943 1873.98 35.943 13MB043-301 542.97 324506.6 3.284 8.7185764 1.7 5.2156113 2.44 0.3297991 1.75 1837.408 27.96 1855.1699 20.8 1875.1237 30.699 1875.12 30.699 13MB043-186 435.75 83130.95 3.895 8.7119318 1.37 5.1789992 2.63 0.3272345 2.25 1824.9633 35.72 1849.1713 22.38 1876.4982 24.606 1876.5 24.606 13MB043-169 688.07 351738 3.451 8.7107749 1.32 5.1847572 2.46 0.3275548 2.07 1826.5189 33 1850.117 20.92 1876.7376 23.73 1876.74 23.73 13MB043-229 313.71 167050.4 6.493 8.7099135 1.24 5.2319411 2.84 0.330503 2.56 1840.8192 40.99 1857.834 24.25 1876.9159 22.356 1876.92 22.356 13MB043-247 151.32 72693.26 2.429 8.7037302 1.54 5.4880921 3.83 0.346438 3.5 1917.5671 58.11 1898.7343 32.89 1878.1959 27.795 1878.2 27.795 13MB043-218 382.89 2767106 2.467 8.6945426 1.45 5.1141901 2.96 0.3224945 2.58 1801.9 40.56 1838.4651 25.14 1880.0992 26.13 1880.1 26.13 13MB043-211 1026 226131.4 36.03 8.6944075 2.55 5.3552217 3.69 0.3376884 2.67 1875.5395 43.42 1877.7243 31.56 1880.1272 45.87 1880.13 45.87 13MB043-274 539.61 123128.5 3.471 8.6916417 1.7 5.3054181 3.58 0.3344415 3.15 1859.8733 50.84 1869.7358 30.56 1880.7004 30.629 1880.7 30.629

149 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB043-254 624.41 3532649 3.856 8.6896112 1.37 5.258616 2.85 0.3314138 2.5 1845.2303 40.09 1862.171 24.33 1881.1214 24.747 1881.12 24.747 13MB043-275 516.98 95766.7 2.188 8.6655703 1.81 5.3553643 3.63 0.3365774 3.15 1870.183 51.15 1877.7471 31.1 1886.1113 32.584 1886.11 32.584 13MB043-199 225.23 84601.15 3.63 8.6393807 1.38 5.3560414 2.58 0.3356026 2.18 1865.4797 35.39 1877.8553 22.1 1891.5558 24.793 1891.56 24.793 13MB043-255 665.02 113715.9 6.583 8.6356095 1.04 4.7577881 3.24 0.2979867 3.07 1681.3172 45.38 1777.4822 27.18 1892.3414 18.737 1892.34 18.737 13MB043-139 567.61 202504.7 7.731 8.6337173 1.82 5.3340596 2.82 0.3340061 2.16 1857.7697 34.81 1874.3376 24.16 1892.7357 32.826 1892.74 32.826 13MB043-328 229.58 170658.4 3.171 8.6289305 1.66 5.2729739 3.34 0.329998 2.89 1838.3719 46.27 1864.4977 28.49 1893.7334 29.929 1893.73 29.929 13MB043-273 507.8 141232.8 2.32 8.5945333 1.26 5.2820572 2.9 0.3292487 2.61 1834.7393 41.61 1865.9669 24.73 1900.9158 22.733 1900.92 22.733 13MB043-271 394.33 212453.1 2.38 8.5579616 1.09 5.1822481 3 0.3216527 2.8 1797.7955 43.91 1849.705 25.56 1908.577 19.487 1908.58 19.487 13MB043-325 430.58 268037.9 5.452 8.5449245 1.66 5.4224638 3.31 0.3360498 2.86 1867.6379 46.39 1888.4112 28.36 1911.3143 29.773 1911.31 29.773 13MB043-319 643.01 274441.3 8.85 8.5421725 1.76 5.1507722 3.83 0.3191093 3.41 1785.3776 53.16 1844.5221 32.61 1911.8926 31.505 1911.89 31.505 13MB043-279 444.74 151655.7 4.435 8.5388155 1.61 5.0131769 2.85 0.3104627 2.35 1742.9831 35.94 1821.5497 24.13 1912.5981 28.867 1912.6 28.867 13MB043-327 396.02 145918.6 5.192 8.5346452 1.2 5.5766716 4.35 0.3451908 4.18 1911.5932 69.11 1912.5032 37.44 1913.4749 21.543 1913.47 21.543 13MB043-112 242.45 166199.6 5.237 8.5233195 1.5 5.6359609 4.89 0.3483979 4.66 1926.9435 77.6 1921.616 42.23 1915.8578 26.924 1915.86 26.924 13MB043-151 428.93 222536.3 3.192 8.4799391 1.47 5.3915862 3.08 0.331595 2.71 1846.1079 43.47 1883.5178 26.4 1925.008 26.346 1925.01 26.346 13MB043-261 525.45 355244.7 4.33 8.4727281 1.5 5.5204238 3.9 0.3392301 3.6 1882.9648 58.8 1903.7817 33.55 1926.5325 26.897 1926.53 26.897 13MB043-245 357.35 489261.2 3.64 8.4408765 1.41 5.5956758 2.56 0.3425617 2.13 1898.9815 35.09 1915.4331 22.01 1933.2751 25.18 1933.28 25.18 13MB043-201 1298.9 120499.3 2.404 8.3829988 1.8 5.4434724 3.82 0.330959 3.37 1843.028 54.09 1891.7273 32.82 1945.5858 32.195 1945.59 32.195 13MB043-209 398.42 145857.5 8.813 8.2725378 1.6 5.3883348 2.97 0.3232898 2.5 1805.7756 39.39 1883.0011 25.42 1969.2643 28.449 1969.26 28.449 13MB043-217 380.92 116811.1 1.888 8.2160827 1.56 5.8154379 3.15 0.3465341 2.74 1918.027 45.42 1948.7133 27.29 1981.465 27.703 1981.47 27.703 13MB043-315 321.46 249001.5 1.914 8.1411066 2.01 6.2814502 3.32 0.3708874 2.64 2033.5747 46.08 2015.8705 29.07 1997.7713 35.675 1997.77 35.675 13MB043-259 594.38 1226551 5.919 8.0044525 1.96 6.1736364 3.61 0.3584028 3.03 1974.5986 51.61 2000.7237 31.55 2027.7972 34.623 2027.8 34.623 13MB043-305 145.73 135014.9 1.174 7.82182 1.98 6.5309704 3.05 0.3704966 2.32 2031.7368 40.45 2050.0827 26.87 2068.5712 34.888 2068.57 34.888 13MB043-164 104.43 72942.56 0.976 7.8009222 2.05 6.5414007 4.04 0.3700969 3.48 2029.8563 60.6 2051.488 35.61 2073.2856 36.202 2073.29 36.202 13MB043-140 160.39 72094.87 2.139 7.6808876 2.22 6.565337 3.72 0.3657355 2.98 2009.303 51.51 2054.7057 32.79 2100.558 39.025 2100.56 39.025 13MB043-293 788.47 838044.6 1.745 7.4658149 2.26 7.0315133 4.33 0.3807367 3.69 2079.7241 65.61 2115.4216 38.49 2150.2902 39.465 2150.29 39.465 13MB043-167 350.92 94143.92 2.843 7.3273734 1.22 7.577509 6.89 0.4026925 6.78 2181.4252 125.5 2182.2039 61.89 2182.923 21.252 2182.92 21.252 13MB043-306 542.79 800402 1.495 7.3172315 1.75 7.3747688 3.27 0.3913758 2.76 2129.2056 50.03 2157.9159 29.25 2185.3331 30.532 2185.33 30.532 13MB043-154 234.11 248601.9 2.749 7.31527 1.89 7.569582 4.31 0.4016067 3.88 2176.4335 71.59 2181.2651 38.68 2185.7995 32.844 2185.8 32.844 13MB043-278 730.83 1681703 1.414 7.0868295 1.9 7.3447864 2.63 0.3775112 1.82 2064.6473 32.08 2154.2742 23.48 2240.8201 32.815 2240.82 32.815 13MB043-258 271.35 129511.8 3.686 7.0314474 1.79 8.0196949 2.71 0.4089793 2.04 2210.2532 38.18 2233.2442 24.51 2254.378 30.919 2254.38 30.919 13MB043-198 223.66 701760.5 0.945 6.8785634 1.96 8.0819241 4.04 0.4031914 3.53 2183.7176 65.38 2240.2255 36.51 2292.2572 33.763 2292.26 33.763 13MB043-287 287.22 238264.5 1.242 6.5262424 1.33 9.2167347 3.65 0.4362536 3.39 2333.8472 66.47 2359.7777 33.4 2382.2484 22.622 2382.25 22.622 13MB043-120 481.29 546264 1.017 6.3520078 1.41 9.3911956 2.79 0.4326439 2.41 2317.6255 46.89 2376.97 25.61 2428.2329 23.879 2428.23 23.879 13MB043-141 102.24 75582.26 1.695 6.3159645 1.54 9.4781797 2.6 0.4341735 2.09 2324.5044 40.78 2385.4343 23.84 2437.8779 26.073 2437.88 26.073 13MB043-157 89.405 73203.79 1.072 6.2836557 1.54 10.325945 3.06 0.4705881 2.64 2486.1394 54.54 2464.4323 28.34 2446.5622 26.103 2446.56 26.103 13MB043-152 39.255 35139.95 2.729 6.2031695 1.56 8.3676393 3 0.376457 2.56 2059.7117 45.06 2271.677 27.18 2468.3523 26.395 2468.35 26.395 13MB043-155 414.8 101426.9 1.399 6.1852109 1.04 8.5668581 3.08 0.3843039 2.9 2096.3573 51.9 2293.0445 28.01 2473.2477 17.483 2473.25 17.483 13MB043-277 142.3 208443.6 2.659 6.1643794 1.57 9.6147787 2.41 0.4298603 1.83 2305.088 35.46 2398.5858 22.19 2478.941 26.527 2478.94 26.527 13MB043-234 275.82 209278.2 1.581 6.1546592 1.82 10.758897 2.99 0.4802534 2.38 2528.3695 49.7 2502.5234 27.81 2481.603 30.69 2481.6 30.69 13MB043-223 99.486 113335 0.534 6.1462708 1.27 10.231392 2.85 0.4560843 2.55 2422.2456 51.54 2455.9199 26.37 2483.903 21.406 2483.9 21.406 13MB043-174 177.69 101731.3 1.755 6.0774654 1.14 10.266924 2.31 0.4525448 2.01 2406.5563 40.32 2459.1271 21.38 2502.8682 19.251 2502.87 19.251 13MB043-310 125.14 195170.7 1.434 6.0529909 1.27 10.621834 2.54 0.466303 2.2 2467.3282 45.06 2490.6184 23.58 2509.6514 21.428 2509.65 21.428 13MB043-187 217.01 215920 1.009 6.0480583 1.22 10.777944 2.48 0.4727708 2.16 2495.7003 44.68 2504.1668 23.06 2511.0225 20.558 2511.02 20.558 13MB043-221 32.435 47102.52 3.196 6.0117558 2 10.567369 4.14 0.4607517 3.62 2442.8761 73.7 2485.8487 38.4 2521.142 33.522 2521.14 33.522 13MB043-188 481.55 304297.1 2.53 6.0073278 1.99 10.093417 3.86 0.4397626 3.31 2349.5776 65.2 2443.3689 35.7 2522.3798 33.415 2522.38 33.415 13MB043-213 202.81 60264.07 1.333 6.002815 1.47 11.036923 3.28 0.4805092 2.94 2529.4831 61.42 2526.2516 30.56 2523.6421 24.632 2523.64 24.632 13MB043-118 637 533694.7 1.174 5.9990497 1.89 10.478426 3.14 0.455908 2.51 2421.4652 50.72 2478.0112 29.16 2524.6959 31.761 2524.7 31.761 13MB043-240 148.25 127641.5 0.394 5.99526 1.66 10.258667 3.07 0.4460645 2.59 2377.7323 51.44 2458.3827 28.44 2525.7571 27.873 2525.76 27.873 13MB043-133 480.71 81421.69 2.946 5.9551824 1.91 10.792616 3.57 0.4661445 3.02 2466.6311 61.93 2505.4309 33.22 2537.014 32.007 2537.01 32.007 13MB043-161 459.41 157812.9 5.667 5.9300647 1.74 9.4833818 5.52 0.4078696 5.24 2205.1744 97.89 2385.9383 50.78 2544.1012 29.232 2544.1 29.232 13MB043-232 281.6 141563.7 3.33 5.8961473 1.62 10.968041 4.24 0.4690252 3.91 2479.2846 80.5 2520.4243 39.43 2553.7051 27.209 2553.71 27.209 13MB043-238 302.67 72453.21 1.71 5.8662935 1.69 10.962053 4.3 0.4663956 3.95 2467.735 81.01 2519.9161 40.01 2562.2023 28.274 2562.2 28.274 13MB043-251 327.48 92014.65 1.462 5.8242012 1.75 10.987908 4.39 0.4641412 4.02 2457.8169 82.24 2522.1084 40.85 2574.2445 29.177 2574.24 29.177 13MB043-269 134.42 404806.7 3.202 4.0876073 1.87 19.751455 4.35 0.585554 3.92 2971.3709 93.4 3079.2673 42.02 3150.4121 29.661 3150.41 29.661 13MB044 13MB044-208 977.3 31610.25 3.533 21.897458 3.3 0.0419486 5.12 0.0066621 3.92 42.804112 1.672 41.724747 2.094 19.887594 79.784 42.8041 1.6724 13MB044-129 102.87 3499.532 0.959 23.304655 8.62 0.039945 9.43 0.0067516 3.83 43.377087 1.656 39.770378 3.679 172.81489 215.19 43.3771 1.6563 13MB044-255 322.43 1113.826 0.855 27.722566 9.29 0.033586 10 0.0067529 3.79 43.385716 1.638 33.542508 3.31 625.45766 254.27 43.3857 1.6381 13MB044-218 993.33 52282.58 1.454 21.249429 2.57 0.0438608 3.99 0.0067596 3.05 43.428754 1.319 43.586515 1.701 52.256637 61.389 43.4288 1.3188 13MB044-203 1135.6 155127.5 0.321 21.900971 3.78 0.042579 4.8 0.0067633 2.96 43.452114 1.28 42.338853 1.991 20.276623 91.545 43.4521 1.2804 13MB044-168 1525.5 28116.18 0.832 21.904045 2.56 0.0425761 4.66 0.0067638 3.89 43.455278 1.684 42.336062 1.931 20.615872 61.996 43.4553 1.6841 13MB044-83 180.17 15402.08 0.569 21.457271 5.57 0.0435077 6.66 0.0067708 3.65 43.500213 1.582 43.242954 2.819 29.009558 133.59 43.5002 1.5819 13MB044-133 305.76 11862 0.371 21.991631 4.81 0.0424614 5.8 0.0067725 3.23 43.511263 1.403 42.224301 2.398 30.281885 116.73 43.5113 1.4025 13MB044-145 860.33 65558.97 1.5 21.447873 2.53 0.0435454 3.42 0.0067737 2.3 43.518794 0.997 43.279656 1.449 30.037605 60.674 43.5188 0.9974 13MB044-88 1056.8 27267.2 1.163 21.459716 3.6 0.0435494 4.94 0.0067781 3.39 43.546735 1.471 43.283553 2.095 28.724954 86.301 43.5467 1.4711 13MB044-223 372.63 1395.101 0.968 28.979455 6.25 0.0322964 7.31 0.006788 3.8 43.610474 1.652 32.274753 2.323 748.23584 175.42 43.6105 1.6523 13MB044-112 336.09 7070.731 0.539 21.516341 5.67 0.0435376 7.12 0.0067941 4.3 43.649454 1.872 43.272064 3.017 22.410716 136.28 43.6495 1.8718 13MB044-313 217.07 5508.672 0.635 22.811923 7.6 0.0412613 7.91 0.0068266 2.19 43.857499 0.956 41.054775 3.181 119.83218 187.61 43.8575 0.9565 13MB044-134 667.65 65207.24 2.54 21.115044 3.39 0.0448934 4.04 0.006875 2.19 44.167455 0.966 44.590374 1.763 67.420838 80.776 44.1675 0.966 13MB044-149 343.53 7565.916 0.865 20.703277 5.91 0.0458587 7.31 0.0068859 4.29 44.237134 1.892 45.528041 3.253 114.05225 139.58 44.2371 1.8922 13MB044-97 955.77 29343.75 4.266 20.806563 3.18 0.0463482 4.45 0.0069941 3.12 44.929937 1.396 46.003146 2.003 102.31679 75.133 44.9299 1.3963 13MB044-38 967.52 19678.54 0.904 16.947952 7.02 0.0570491 7.6 0.0070124 2.9 45.046862 1.302 56.334613 4.165 567.2705 153.1 45.0469 1.3018 13MB044-151 241.65 29793.35 4.071 21.651132 6.28 0.0446809 7.41 0.0070162 3.93 45.071345 1.767 44.383913 3.218 7.3902446 151.24 45.0713 1.7673 13MB044-217 1566.4 54625.8 2.056 21.912654 2.87 0.0441974 3.92 0.0070241 2.67 45.121967 1.198 43.913867 1.683 21.56717 69.422 45.122 1.1984 13MB044-250 554.16 1974.292 0.861 24.299224 4.89 0.0401459 5.53 0.0070751 2.58 45.448364 1.168 39.966442 2.168 278.05381 124.59 45.4484 1.1677 13MB044-71 1027.8 155569.4 3.214 20.072557 2.9 0.0488339 3.42 0.0071092 1.82 45.666919 0.828 48.41241 1.619 186.54706 67.53 45.6669 0.8282 13MB044-192 1550.7 275359.4 2.509 21.568829 2.46 0.0455756 3.48 0.0071295 2.46 45.796455 1.121 45.253085 1.54 16.525738 59.161 45.7965 1.1214

150 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB044-176 1098.3 218714.2 0.717 20.96079 3.49 0.0470901 5.02 0.0071587 3.6 45.983778 1.652 46.722871 2.29 84.796256 82.733 45.9838 1.6517 13MB044-159 1467.8 50730.57 1.915 21.489733 2.36 0.0459409 3.27 0.0071603 2.26 45.993623 1.036 45.607861 1.457 25.375001 56.579 45.9936 1.0356 13MB044-13 1804.3 24319.74 0.61 20.733292 2.79 0.0476662 3.67 0.0071677 2.39 46.040953 1.095 47.281377 1.696 110.64982 65.851 46.041 1.0954 13MB044-106 1979.8 26644.84 2.545 20.928586 3.11 0.0473664 4.16 0.0071897 2.77 46.181799 1.274 46.990756 1.912 88.488366 73.723 46.1818 1.2742 13MB044-293 1553.2 5435.071 4.017 20.75705 4.15 0.0479242 5.42 0.0072147 3.49 46.342063 1.613 47.531344 2.517 107.92974 97.934 46.3421 1.6131 13MB044-28 1460.2 18900.19 0.629 21.66769 3.17 0.0464251 4.37 0.0072956 3 46.860037 1.402 46.077733 1.968 5.5516974 76.357 46.86 1.4022 13MB044-48 1953.2 20200.28 0.633 20.947531 2.88 0.0482197 3.62 0.0073258 2.2 47.053146 1.031 47.817675 1.693 86.34288 68.351 47.0531 1.031 13MB044-109 1433 39077.81 0.908 21.341374 3.25 0.0474931 3.77 0.0073511 1.92 47.214871 0.905 47.113596 1.737 41.98351 77.642 47.2149 0.9055 13MB044-196 1753.4 29152.28 1.025 20.851585 2.55 0.0491369 3.52 0.007431 2.42 47.725978 1.149 48.705687 1.672 97.173552 60.447 47.726 1.1492 13MB044-8 1981.9 13660.71 2.107 21.261942 2.14 0.048761 3.18 0.0075193 2.36 48.29088 1.136 48.341884 1.503 50.849296 50.976 48.2909 1.136 13MB044-155 1279.9 32728.97 5.231 21.701631 2.6 0.0478686 3.5 0.0075343 2.35 48.387094 1.131 47.477528 1.625 1.7736036 62.671 48.3871 1.1315 13MB044-127 1574.4 63865.95 2.36 20.755271 2.67 0.0505625 3.66 0.0076112 2.49 48.879426 1.214 50.084489 1.786 108.12268 63.096 48.8794 1.2144 13MB044-144 1683.2 18251.54 1.651 10.485925 3.41 0.1002263 4.85 0.0076223 3.45 48.950313 1.68 96.985218 4.483 1535.2941 64.151 48.9503 1.6804 13MB044-85 2208.8 70465.16 1.934 21.9527 1.93 0.0479441 3.35 0.0076335 2.74 49.021622 1.34 47.550634 1.558 25.987747 46.731 49.0216 1.3396 13MB044-110 2470.2 54741.46 2.137 20.75787 3.25 0.0523322 4 0.0078786 2.33 50.589893 1.172 51.793548 2.019 107.87081 76.807 50.5899 1.1718 13MB044-96 2440.4 27812.35 2.01 21.372302 2.94 0.050915 3.72 0.0078922 2.29 50.676443 1.154 50.425188 1.831 38.475131 70.263 50.6764 1.1541 13MB044-162 1286.4 51282 2.787 21.302479 2.59 0.051232 3.69 0.0079153 2.62 50.824717 1.329 50.731362 1.826 46.325257 61.953 50.8247 1.3286 13MB044-57 2376.2 45311.28 1.172 20.837815 1.86 0.0532062 4.03 0.0080411 3.57 51.628676 1.836 52.636468 2.065 98.752838 44.055 51.6287 1.8358 13MB044-75 2408.4 229018.3 1.868 21.347228 1.86 0.0526558 3.07 0.0081524 2.45 52.34076 1.277 52.105667 1.562 41.329513 44.413 52.3408 1.2774 13MB044-84 2901.9 30571.16 2.362 21.295954 1.96 0.0535766 2.81 0.0082751 2.01 53.124912 1.061 52.993487 1.449 47.03144 46.864 53.1249 1.0613 13MB044-222 1898.3 70870.3 2.649 21.295787 2.48 0.0536645 3.13 0.0082886 1.92 53.211325 1.018 53.078226 1.621 47.050177 59.152 53.2113 1.0184 13MB044-314 1819.8 11874.05 2.454 21.765329 3.77 0.0543406 9.8 0.008578 9.05 55.061794 4.962 53.72953 5.131 5.2642939 91.018 55.0618 4.9621 13MB044-289 1781.6 243976 2.327 21.033467 3.72 0.0562486 4.57 0.0085807 2.65 55.078607 1.456 55.5654 2.47 76.579138 88.35 55.0786 1.4558 13MB044-265 1944.1 14627.08 1.327 21.631147 2.73 0.055911 3.85 0.0087715 2.72 56.298427 1.524 55.240838 2.072 9.6129779 65.69 56.2984 1.5239 13MB044-58 3028.2 25162.07 3.014 21.11805 2.82 0.0581841 3.57 0.0089116 2.19 57.19359 1.249 57.424339 1.992 67.035572 67.035 57.1936 1.2489 13MB044-304 2055.9 62008.83 2.346 21.157773 2.83 0.058855 3.41 0.0090313 1.9 57.958432 1.095 58.067886 1.924 62.561628 67.431 57.9584 1.0953 13MB044-242 2056.1 26797.5 2.916 21.712448 3.35 0.0577573 3.76 0.0090952 1.72 58.366698 0.999 57.014695 2.087 0.5563261 80.698 58.3667 0.9986 13MB044-9 3472.1 8716.206 1.987 9.3650127 2.21 0.1360408 3.11 0.0092401 2.19 59.291942 1.293 129.51133 3.787 1745.1552 40.554 59.2919 1.2929 13MB044-290 2170.5 60017.5 1.613 20.985926 2.89 0.0607451 3.91 0.0092457 2.64 59.327554 1.56 59.878762 2.275 81.952747 68.517 59.3276 1.5599 13MB044-330 2158.4 15018.38 2.891 21.164408 3.36 0.0606248 4.56 0.0093058 3.08 59.711823 1.833 59.763572 2.648 61.839178 80.123 59.7118 1.8332 13MB044-247 2271.1 71065.01 0.854 20.266746 2.55 0.0717683 3.52 0.0105491 2.43 67.647666 1.633 70.376083 2.392 164.08701 59.556 67.6477 1.6333 13MB044-79 3736.9 26051.25 1.937 21.07239 2.67 0.0697447 3.15 0.0106592 1.68 68.34989 1.144 68.457191 2.087 72.20875 63.397 68.3499 1.1441 13MB044-305 2246.2 19830.86 0.579 20.457297 2.67 0.0765865 3.62 0.0113632 2.44 72.838628 1.77 74.930623 2.614 142.16781 62.656 72.8386 1.7698 13MB044-326 2262.5 48860.88 0.245 20.750681 2.88 0.075982 3.64 0.0114352 2.23 73.297458 1.623 74.360335 2.608 108.68024 67.913 73.2975 1.6231 13MB044-323 2284.1 33295.29 2.226 21.58398 2.63 0.0771794 4.28 0.0120818 3.38 77.417542 2.599 75.489615 3.114 14.867763 63.184 77.4175 2.5986 13MB044-20 3764.3 63924 1.885 21.123094 1.76 0.0830654 2.19 0.0127255 1.31 81.516586 1.064 81.022875 1.708 66.488563 41.808 81.5166 1.0639 13MB044-312 2231.7 9773.675 1.314 22.14333 2.57 0.0805238 3.25 0.012932 1.99 82.830619 1.637 78.637265 2.459 46.974003 62.495 82.8306 1.6374 13MB044-237 1973.5 65218.45 0.697 21.050022 2.15 0.1037069 5.68 0.0158328 5.26 101.26549 5.284 100.19232 5.42 74.729692 51.046 101.265 5.2839 13MB044-44 890.44 78610.52 2.76 19.089348 2.77 0.1477989 3.82 0.0204626 2.64 130.57895 3.41 139.96658 4.998 302.24437 63.06 130.579 3.4099 13MB044-193 665.21 69338.34 2.025 16.569118 2.41 0.2674722 3.64 0.0321423 2.73 203.94222 5.485 240.67072 7.81 616.24158 52.107 203.942 5.4851 13MB044-310 272.09 3331.996 1.705 17.953962 2.84 0.2533875 3.55 0.0329947 2.13 209.26388 4.386 229.32413 7.285 440.32867 63.162 209.264 4.3864 13MB044-135 640.54 97486.84 1.963 19.958723 2.18 0.2284032 3.74 0.0330623 3.04 209.68599 6.265 208.87962 7.052 199.79322 50.526 209.686 6.2646 13MB044-195 400.23 72457.02 2.238 19.8854 3.04 0.2293372 4.09 0.0330756 2.75 209.76864 5.67 209.65138 7.757 208.35563 70.423 209.769 5.6703 13MB044-116 1115.3 91693.2 2.562 19.392059 2.82 0.2353678 4.38 0.0331032 3.35 209.94084 6.922 214.62027 8.468 266.28337 64.631 209.941 6.9219 13MB044-60 1719.4 16559.8 2.247 11.008599 5.38 0.4148248 6.08 0.0331204 2.82 210.04821 5.835 352.34369 18.1 1443.1919 102.66 210.048 5.8349 13MB044-264 632.68 57682.68 2.359 19.699578 3.33 0.2325088 4.01 0.0332197 2.23 210.66754 4.625 212.26764 7.68 230.03841 76.939 210.668 4.6252 13MB044-233 312.98 10363.25 3.989 19.464952 3.56 0.237052 4.5 0.0334654 2.75 212.20046 5.742 216.00358 8.751 257.668 81.81 212.2 5.742 13MB044-125 456.91 77586.84 2.646 20.039262 2.78 0.2303061 3.66 0.0334723 2.38 212.24386 4.974 210.45137 6.954 190.45479 64.599 212.244 4.9743 13MB044-64 412.58 15773.7 1.828 20.688431 2.3 0.2231619 4.45 0.0334847 3.8 212.32099 7.947 204.538 8.235 115.77854 54.193 212.321 7.9471 13MB044-157 628.96 88785.58 3.12 19.176281 1.98 0.2408614 3.58 0.0334989 2.98 212.40947 6.222 219.12557 7.049 291.91121 45.25 212.409 6.2217 13MB044-279 624.26 25992.12 1.779 18.743255 3.41 0.2466521 4.35 0.0335296 2.7 212.60115 5.654 223.85301 8.741 343.82861 77.162 212.601 5.6544 13MB044-297 510.83 15100.32 1.816 20.102755 2.14 0.2301522 4.03 0.0335559 3.41 212.76538 7.132 210.32434 7.648 183.04636 49.938 212.765 7.1323 13MB044-248 713.85 22379.66 2.296 19.550113 2.73 0.2374569 3.66 0.0336692 2.44 213.47173 5.119 216.33587 7.128 247.62235 62.822 213.472 5.1193 13MB044-320 527.11 44441.77 2.011 19.9577 3.78 0.232733 5.01 0.0336874 3.28 213.58508 6.891 212.4523 9.601 199.91915 87.925 213.585 6.8913 13MB044-37 528.53 28995.08 3.347 19.826245 1.85 0.2343307 3.47 0.0336952 2.94 213.63403 6.172 213.76745 6.688 215.21661 42.763 213.634 6.1724 13MB044-122 372.46 44585.75 3.043 20.327619 2.32 0.2291457 3.98 0.0337829 3.24 214.18081 6.82 209.49321 7.535 157.11429 54.212 214.181 6.82 13MB044-201 830.06 383664.1 2.283 19.716053 2.07 0.2362581 3.59 0.0337836 2.93 214.18491 6.18 215.35176 6.964 228.10778 47.755 214.185 6.1803 13MB044-251 1280.1 56861.4 3.028 19.835358 2.1 0.234996 4.31 0.0338064 3.76 214.32746 7.931 214.31459 8.325 214.19498 48.665 214.327 7.9306 13MB044-150 345.19 21955.76 2.343 20.082026 1.79 0.2323517 3.77 0.0338417 3.32 214.54737 7.001 212.13817 7.216 185.44841 41.645 214.547 7.0013 13MB044-169 241.71 231096.5 1.904 19.977487 3.12 0.2340425 4.11 0.0339105 2.68 214.9765 5.659 213.53039 7.919 197.60439 72.54 214.977 5.6586 13MB044-22 391.75 10136.45 2.248 20.232354 2.97 0.2312379 5.65 0.0339316 4.8 215.1079 10.16 211.22009 10.77 168.05625 69.373 215.108 10.161 13MB044-184 562.72 156240.8 2.636 19.758715 2.41 0.2369751 3.11 0.0339594 1.97 215.28136 4.161 215.94047 6.044 223.13954 55.67 215.281 4.1613 13MB044-126 211.92 17153.41 2.131 19.765108 3.35 0.2369342 4.2 0.0339645 2.52 215.31329 5.346 215.90687 8.161 222.40747 77.524 215.313 5.3462 13MB044-325 1089 26386.36 1.368 19.23609 2.54 0.2436248 3.85 0.0339889 2.9 215.46514 6.14 221.38429 7.662 284.7544 58.04 215.465 6.1402 13MB044-164 408.5 29823.8 1.692 19.537771 2.48 0.2399308 5.74 0.0339985 5.18 215.52509 10.97 218.36381 11.28 249.06282 57.096 215.525 10.97 13MB044-178 580.59 65839.67 2.446 18.023369 3.15 0.2601147 3.99 0.0340016 2.46 215.54454 5.21 234.75939 8.37 431.7374 70.149 215.545 5.2101 13MB044-311 679.42 35079.01 2.489 19.161249 2.46 0.2446687 4.32 0.0340017 3.56 215.54517 7.542 222.23627 8.633 293.69786 56.159 215.545 7.5421 13MB044-138 195.76 19216.77 1.567 20.18537 3.24 0.2328811 6.41 0.0340934 5.52 216.11639 11.74 212.5743 12.29 173.48344 75.688 216.116 11.74 13MB044-209 598.14 96806.67 2.538 20.036099 2.4 0.235497 4.88 0.0342214 4.24 216.91436 9.055 214.72646 9.441 190.82227 55.879 216.914 9.0548 13MB044-152 496.5 221891.8 1.401 20.349375 2.48 0.2319052 3.64 0.0342263 2.67 216.94525 5.688 211.77021 6.957 154.56842 58.027 216.945 5.6879 13MB044-26 903.78 48308.89 3.55 19.695038 2 0.2400145 2.59 0.0342841 1.65 217.30553 3.516 218.43234 5.095 230.57069 46.288 217.306 3.516 13MB044-68 259.35 45535.85 2.278 19.756316 2.59 0.2396434 3.8 0.0343376 2.78 217.63888 5.956 218.12836 7.467 223.40908 59.993 217.639 5.9564 13MB044-207 258.88 34518.19 2.248 19.819946 2.79 0.2390654 3.86 0.0343651 2.67 217.81037 5.717 217.65486 7.569 215.99378 64.692 217.81 5.717 13MB044-140 743.74 52459.71 2.789 18.47813 2.38 0.2566938 4.13 0.0344011 3.38 218.03446 7.241 231.99908 8.57 375.9429 53.529 218.034 7.2413 13MB044-283 987.99 23905.58 3.364 19.910753 1.82 0.2382787 3.99 0.034409 3.55 218.08362 7.615 217.01 7.8 205.37725 42.301 218.084 7.6153 13MB044-211 478.51 100364.4 2.552 19.449241 2.89 0.2440042 4.52 0.034419 3.47 218.1463 7.452 221.694 8.997 259.49677 66.33 218.146 7.4517 13MB044-231 912.67 30708.54 2.279 18.376911 2.14 0.2584261 3.15 0.0344435 2.31 218.29897 4.967 233.3978 6.57 388.28813 48.005 218.299 4.9667

151 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB044-77 316.16 34762.53 2.48 19.405984 3.72 0.2448275 5.34 0.0344584 3.83 218.39141 8.234 222.36582 10.66 264.62126 85.312 218.391 8.2341 13MB044-226 630.29 5959.587 3.581 20.05151 3.55 0.237284 5.87 0.0345076 4.67 218.69803 10.05 216.19402 11.43 188.98841 82.588 218.698 10.046 13MB044-177 139.65 17114.65 2.615 20.62829 4.52 0.2313189 5.19 0.0346077 2.54 219.32218 5.473 211.2869 9.896 122.59478 106.63 219.322 5.4729 13MB044-187 595.32 50630.65 4.024 19.923776 2.26 0.2398124 4.79 0.0346531 4.23 219.60479 9.125 218.26681 9.411 203.83908 52.378 219.605 9.1252 13MB044-32 542.74 21354.21 2.203 19.541455 1.77 0.2446455 4.03 0.0346731 3.62 219.72952 7.81 222.21732 8.034 248.61924 40.758 219.73 7.81 13MB044-65 547.94 37220.47 1.843 20.103341 2.49 0.2378208 3.78 0.034675 2.85 219.74147 6.149 216.63445 7.377 182.9785 58.009 219.741 6.1492 13MB044-19 960.06 51891.14 3.373 19.285887 2.77 0.247925 5.42 0.0346784 4.66 219.7623 10.06 224.88926 10.93 278.88341 63.443 219.762 10.062 13MB044-78 604.87 25797.6 2.441 19.370502 2.69 0.2472625 3.98 0.0347374 2.94 220.13031 6.366 224.35004 8.02 268.80858 61.651 220.13 6.3656 13MB044-90 381.15 26858.54 2.241 20.063708 2.94 0.2387633 4.38 0.0347438 3.25 220.16999 7.038 217.40724 8.579 187.57264 68.419 220.17 7.0376 13MB044-275 817.72 20146.21 3.129 17.252941 5.22 0.2779316 5.78 0.0347776 2.49 220.38059 5.389 249.01541 12.77 528.31407 114.44 220.381 5.3894 13MB044-35 323.86 38938.6 2.22 20.161902 3.27 0.2380188 3.99 0.034805 2.3 220.55108 4.976 216.7968 7.794 176.19737 76.192 220.551 4.9765 13MB044-146 423.74 23410.05 1.83 20.290786 1.74 0.2373735 4.03 0.0349325 3.64 221.34553 7.919 216.26748 7.855 161.33244 40.628 221.346 7.9193 13MB044-54 341.91 14023.31 2.312 19.950993 2.93 0.2415314 4.91 0.0349492 3.94 221.44927 8.567 219.6737 9.695 200.70508 68.1 221.449 8.5669 13MB044-69 380.21 30458.01 1.803 20.131626 2.91 0.2394457 4.35 0.0349611 3.23 221.52334 7.04 217.96647 8.537 179.70268 67.918 221.523 7.0398 13MB044-99 514.07 26325.81 3.527 20.261161 2.5 0.2379582 5.03 0.0349674 4.37 221.56295 9.513 216.7471 9.819 164.73159 58.325 221.563 9.5131 13MB044-23 1112.5 39993.8 2.414 18.552274 1.79 0.2599118 3.09 0.0349721 2.52 221.59214 5.486 234.59584 6.467 366.9259 40.252 221.592 5.4858 13MB044-93 1337.7 246660.1 4.181 19.12182 1.98 0.2523276 3.32 0.0349939 2.67 221.72803 5.815 228.46515 6.796 298.36483 45.137 221.728 5.8154 13MB044-105 269.66 19669.31 1.741 19.629021 3.24 0.2464476 4.36 0.035085 2.92 222.29544 6.376 223.6864 8.752 238.35347 74.709 222.295 6.3761 13MB044-239 1023.6 29147.21 3.56 19.976786 2.83 0.2428621 3.8 0.0351872 2.54 222.93143 5.567 220.76144 7.543 197.70584 65.714 222.931 5.5673 13MB044-321 879.13 10843.5 3.942 19.5475 2.49 0.2482372 4.38 0.035193 3.6 222.96806 7.89 225.14321 8.836 247.9517 57.249 222.968 7.8897 13MB044-300 731.09 179255.2 2.115 19.520668 3.31 0.2485849 4.44 0.035194 2.96 222.97383 6.483 225.42606 8.97 251.06938 76.111 222.974 6.4833 13MB044-40 1757.6 39345 3.046 16.870319 2.58 0.2880215 3.6 0.0352409 2.51 223.26606 5.498 257.00087 8.173 577.25873 56.208 223.266 5.4975 13MB044-268 765.76 55744.59 3.529 19.88343 3 0.244411 4.83 0.0352461 3.79 223.29835 8.327 222.02605 9.642 208.57148 69.486 223.298 8.3274 13MB044-172 264.81 68490.64 1.999 20.303576 2.51 0.2404081 2.91 0.0354014 1.49 224.26543 3.277 218.75459 5.734 159.8621 58.615 224.265 3.2771 13MB044-173 218.47 255637.5 2.397 19.383673 2.4 0.2518649 3.67 0.0354081 2.78 224.3071 6.125 228.08995 7.506 267.2491 55.182 224.307 6.1253 13MB044-49 486.47 22354.48 3.032 19.739514 1.83 0.2473424 6.45 0.0354106 6.19 224.32298 13.64 224.41511 13 225.3592 42.372 224.323 13.645 13MB044-296 998.53 115438.1 2.116 19.328908 2.97 0.2533303 3.9 0.0355135 2.53 224.96324 5.592 229.27785 8.011 273.73696 68.132 224.963 5.5918 13MB044-286 802.56 85855.79 3.541 19.553279 2.4 0.2510556 3.9 0.0356031 3.07 225.52137 6.808 227.43332 7.939 247.23506 55.166 225.521 6.8079 13MB044-303 1142.6 24596.47 3.714 19.465006 2.85 0.2524787 3.97 0.0356433 2.76 225.7714 6.121 228.58765 8.122 257.65526 65.536 225.771 6.1214 13MB044-257 577.77 38007.82 1.8 20.389427 3.72 0.241582 4.6 0.0357247 2.7 226.2779 6.01 219.71509 9.079 149.9974 87.127 226.278 6.0095 13MB044-25 1139.6 33271.04 2.178 19.242945 1.96 0.25803 6.14 0.0360114 5.81 228.06243 13.03 233.07814 12.78 283.94696 44.859 228.062 13.027 13MB044-240 532.28 13946.18 3.232 20.327805 2.95 0.2443056 4.54 0.0360182 3.46 228.10481 7.748 221.93999 9.058 157.0963 68.999 228.105 7.7481 13MB044-10 482.23 141079.2 3.205 19.836638 2.14 0.2512758 5.26 0.0361508 4.8 228.92934 10.8 227.61203 10.72 214.04642 49.574 228.929 10.795 13MB044-63 727.37 35304.89 1.717 17.078197 3.05 0.2922536 4.24 0.0361993 2.95 229.2315 6.635 260.3317 9.739 550.53847 66.589 229.232 6.635 13MB044-43 1464.5 75219.62 2.859 18.967816 1.67 0.2637341 2.81 0.0362813 2.26 229.74113 5.102 237.67165 5.954 316.78083 37.934 229.741 5.1023 13MB044-329 371.61 25080.61 1.813 19.780348 3.58 0.2529896 4.12 0.036294 2.04 229.82063 4.602 229.00174 8.449 220.59215 82.876 229.821 4.6017 13MB044-284 1191.3 93815.08 1.71 20.056203 2.9 0.2499334 4.78 0.0363556 3.8 230.20377 8.59 226.52207 9.706 188.44419 67.541 230.204 8.5898 13MB044-91 436.11 33770.78 6.321 19.666458 2.15 0.2559752 3.05 0.0365109 2.17 231.16963 4.917 231.41832 6.314 233.96695 49.639 231.17 4.9172 13MB044-276 405.44 14976.81 2.567 20.410824 2.92 0.2474358 5.9 0.0366287 5.13 231.90227 11.68 224.49115 11.89 147.53276 68.452 231.902 11.684 13MB044-291 233.9 28497.48 2.441 19.112263 4.97 0.2665359 6.26 0.0369459 3.79 233.87446 8.715 239.92029 13.37 299.50435 113.52 233.874 8.7148 13MB044-160 179.27 25493.19 1.909 19.799679 3.45 0.2594026 4.72 0.0372504 3.21 235.76717 7.44 234.18537 9.866 218.34542 79.934 235.767 7.4397 13MB044-163 215.54 17062.68 1.64 19.885896 3.32 0.2658906 4.47 0.0383484 2.99 242.58721 7.126 239.40285 9.535 208.29776 77.019 242.587 7.1261 13MB044-123 171.6 12806.67 1.916 18.397662 3.62 0.2898339 4.75 0.0386732 3.08 244.60377 7.383 258.42861 10.84 385.75528 81.393 244.604 7.3826 13MB044-318 1616.2 102683.6 5.252 14.752053 3 0.3632045 3.79 0.03886 2.32 245.7626 5.598 314.60441 10.26 862.03315 62.22 245.763 5.5979 13MB044-278 1742.9 26483.95 2.812 18.518043 2.33 0.2936876 3.33 0.0394439 2.38 249.38479 5.815 261.45779 7.671 371.08644 52.452 249.385 5.8148 13MB044-294 1845.4 35653.41 2.609 19.786165 2.33 0.2755447 3 0.0395414 1.89 249.98992 4.624 247.11712 6.577 219.90807 53.946 249.99 4.6244 13MB044-62 183.04 29850.66 2.216 19.626833 4.26 0.2781155 5.08 0.039589 2.77 250.28468 6.793 249.16154 11.23 238.58817 98.367 250.285 6.7926 13MB044-260 1804.4 69016.53 2.066 17.785056 2.72 0.3093553 3.75 0.0399036 2.58 252.23512 6.38 273.68118 8.991 461.32109 60.293 252.235 6.3795 13MB044-139 51.967 46516.54 0.988 17.844991 6 0.3093256 6.82 0.0400342 3.25 253.04483 8.058 273.65813 16.37 453.90027 133.33 253.045 8.0576 13MB044-107 250.45 43102.96 2.67 19.609876 2.85 0.2816372 3.54 0.0400556 2.1 253.17777 5.205 251.95543 7.894 240.58778 65.715 253.178 5.2054 13MB044-204 272.68 46458.61 2.378 19.462523 2.19 0.2862536 3.68 0.0404063 2.96 255.35073 7.414 255.60622 8.322 257.97216 50.33 255.351 7.4135 13MB044-236 1729 21527.8 1.514 14.713457 4.4 0.3787423 5.13 0.0404164 2.63 255.41327 6.594 326.1123 14.31 867.49833 91.35 255.413 6.5939 13MB044-272 1880.7 77444.47 2.867 19.177281 1.83 0.2966253 2.55 0.0412566 1.77 260.61756 4.53 263.76094 5.923 291.79785 41.845 260.618 4.5305 13MB044-131 181.09 45140.36 1.817 19.012377 3.26 0.3089794 3.97 0.0426054 2.28 268.96225 6.003 273.38958 9.526 311.4783 74.127 268.962 6.003 13MB044-120 257.81 39354 1.227 19.30965 2.79 0.3105125 4.47 0.0434863 3.5 274.40645 9.391 274.57817 10.76 276.02065 63.909 274.406 9.3912 13MB044-114 61.942 14255.53 1.567 21.07609 5.02 0.2845441 6.17 0.0434949 3.59 274.4597 9.635 254.25584 13.88 71.814124 119.49 274.46 9.6347 13MB044-225 715.04 157727.4 8.122 18.424904 3.06 0.3287354 4.49 0.0439289 3.29 277.14032 8.912 288.59994 11.27 382.42952 68.691 277.14 8.9123 13MB044-306 584.47 26544.64 2.532 18.867242 2.38 0.3250265 3.61 0.044476 2.72 280.51792 7.475 285.76174 9 328.8762 53.904 280.518 7.4746 13MB044-200 55.174 11029.83 2.389 20.43365 5.75 0.3009087 6.53 0.0445943 3.08 281.24791 8.484 267.10971 15.33 144.88171 135.11 281.248 8.4841 13MB044-119 100.14 24342.5 1.113 17.139905 4.13 0.3598823 5.66 0.0447371 3.87 282.12895 10.68 312.12686 15.21 542.67856 90.347 282.129 10.676 13MB044-31 385.15 23494.76 26.26 18.421834 2.23 0.3360931 7.09 0.0449046 6.73 283.16275 18.65 294.20699 18.11 382.8038 50.042 283.163 18.649 13MB044-137 165.43 72932.47 0.798 19.077807 2.7 0.3247277 4.79 0.044931 3.96 283.32566 10.97 285.53272 11.93 303.63024 61.642 283.326 10.969 13MB044-45 1240 106703.1 5.486 19.098891 1.81 0.3253023 3.02 0.0450603 2.42 284.12297 6.713 285.97305 7.517 301.1449 41.182 284.123 6.7126 13MB044-227 159.43 33050.66 1.104 18.851976 5.24 0.3315063 6.21 0.045326 3.33 285.76183 9.296 290.71522 15.69 330.73696 118.93 285.762 9.2955 13MB044-228 331.35 19237.14 1.684 19.346591 2.97 0.3306462 4.37 0.0463945 3.21 292.34791 9.175 290.0591 11.03 271.64005 68.057 292.348 9.1745 13MB044-17 454.69 27528.87 1.651 19.007082 2.3 0.3413488 3.29 0.0470557 2.36 296.42007 6.827 298.19331 8.513 312.0766 52.377 296.42 6.8265 13MB044-14 275.74 1139633 1.452 18.99199 2.15 0.3523051 2.92 0.0485275 1.98 305.4751 5.901 306.45341 7.722 313.89976 48.84 305.475 5.9005 13MB044-27 53.878 17582.97 0.892 18.832016 6.81 0.3582477 7.32 0.0489304 2.69 307.95166 8.079 310.90565 19.6 333.11251 154.52 307.952 8.0792 13MB044-202 81.599 45412.16 1.199 18.163251 4 0.3761845 5.24 0.0495557 3.39 311.79298 10.31 324.22685 14.55 414.48496 89.454 311.793 10.31 13MB044-220 254.22 85087.93 2.224 18.98438 3.67 0.3689516 5.48 0.0508001 4.07 319.43193 12.67 318.8762 14.99 314.80193 83.487 319.432 12.672 13MB044-98 362.78 47646.36 4.428 18.086669 2 0.3927409 3.53 0.0515185 2.91 323.83775 9.192 336.36965 10.11 423.92157 44.563 323.838 9.1918 13MB044-328 340.45 21610.57 2.088 19.462207 2.94 0.3656656 4.14 0.0516149 2.92 324.42848 9.25 316.43596 11.26 258.00982 67.453 324.428 9.2497 13MB044-82 450.72 30063.73 0.967 18.814579 2.29 0.3790758 4.27 0.0517272 3.61 325.11716 11.45 326.35787 11.93 335.20151 51.82 325.117 11.45 13MB044-153 326.33 66370.14 5 19.50097 1.91 0.3684539 2.95 0.052112 2.26 327.47537 7.203 318.50697 8.077 253.41478 43.887 327.475 7.2031 13MB044-277 705.92 30682.16 7.435 19.468655 2.08 0.372374 3.2 0.0525792 2.43 330.3371 7.83 321.41149 8.813 257.23206 47.763 330.337 7.8296 13MB044-92 225.24 43444.78 1.264 19.147933 2.99 0.3801377 4.01 0.0527912 2.67 331.63529 8.636 327.13943 11.22 295.29375 68.315 331.635 8.6364 13MB044-18 431.09 36624.49 0.38 13.617651 7.56 0.5413612 7.8 0.0534673 1.94 335.77369 6.356 439.32166 27.83 1025.9375 153.1 335.774 6.3559

152 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB044-309 2005.3 89358.78 1.872 18.983477 2.18 0.3887514 3.99 0.0535237 3.34 336.11915 10.95 333.45692 11.35 314.92393 49.629 336.119 10.955 13MB044-307 598.89 20649.65 1.551 18.321677 2.26 0.4118542 3.4 0.0547277 2.53 343.48209 8.475 350.20955 10.07 395.04243 50.769 343.482 8.4749 13MB044-16 246.79 26682.66 1.339 18.190747 2.21 0.4535743 3.51 0.0598408 2.72 374.65748 9.912 379.77918 11.12 411.10419 49.5 374.657 9.9121 13MB044-186 166.34 61844.49 2.387 17.83118 3.17 0.4963915 4.08 0.0641953 2.57 401.08886 10 409.25675 13.76 455.58564 70.455 401.089 10.002 13MB044-205 86.199 44120.47 1.136 17.849369 3.59 0.5037333 4.63 0.0652112 2.93 407.23997 11.56 414.22643 15.76 453.31351 79.765 407.24 11.557 13MB044-128 218.16 78957.49 1.891 18.480168 1.93 0.4895298 3 0.0656121 2.3 409.66545 9.113 404.59004 10 375.69502 43.372 409.665 9.1128 13MB044-148 249.35 143228.2 2.418 18.080632 2.12 0.519242 3.56 0.0680898 2.86 424.63714 11.77 424.64492 12.36 424.66624 47.308 424.637 11.768 13MB044-324 411.59 75871.18 3.969 18.180713 1.66 0.5243183 3.17 0.0691361 2.7 430.9486 11.27 428.03195 11.08 412.33751 37.185 430.949 11.266 13MB044-3 261.4 84115.51 2.143 16.428455 4.83 0.5835317 5.31 0.069528 2.21 433.31159 9.282 466.72857 19.89 634.66426 104.02 433.312 9.2821 13MB044-316 188.34 25497.6 1.554 18.877426 3.81 0.5113459 4.77 0.0700094 2.87 436.21221 12.1 419.35377 16.38 327.66528 86.455 436.212 12.098 13MB044-87 360.09 49090.85 1.236 18.129309 2.11 0.5347317 3.54 0.0703098 2.84 438.02188 12.04 434.94499 12.53 418.66452 47.209 438.022 12.037 13MB044-213 83.962 27194.23 2.205 18.016374 3.32 0.5381102 4.16 0.0703133 2.5 438.04277 10.59 437.17775 14.77 432.60391 73.999 438.043 10.594 13MB044-66 67.277 6150.858 1.517 17.857263 4.86 0.5444746 6.88 0.0705166 4.86 439.26712 20.64 441.37052 24.62 452.33199 108.04 439.267 20.643 13MB044-136 74.448 28352.96 1.425 17.514557 3.27 0.5598222 5.01 0.0711128 3.79 442.85672 16.23 451.41074 18.25 495.24041 72.149 442.857 16.227 13MB044-130 201.11 63074.85 0.972 17.917627 2.27 0.5503457 3.35 0.0715179 2.47 445.29412 10.64 445.22309 12.09 444.83537 50.395 445.294 10.637 13MB044-282 274.79 10680.23 0.956 17.71186 3.39 0.5578931 4.31 0.0716661 2.66 446.18573 11.48 450.1542 15.66 470.49848 74.974 446.186 11.476 13MB044-241 482.34 157018.4 3.569 17.658407 2.71 0.5871936 4.21 0.0752024 3.22 467.4224 14.52 469.07389 15.81 477.14251 59.946 467.422 14.524 13MB044-249 515.71 146845.8 2.324 16.331807 1.8 0.79305 3.2 0.0939363 2.65 578.77513 14.68 592.90052 14.39 647.35152 38.614 578.775 14.68 13MB044-246 237.66 14850.74 0.99 16.306326 2.86 0.7986249 5.1 0.0944491 4.22 581.79599 23.5 596.05262 23 650.68029 61.437 581.796 23.497 13MB044-235 1368.8 203705.3 10.37 14.986871 1.98 1.0091205 4.18 0.1096864 3.68 670.92625 23.46 708.42976 21.32 829.22306 41.281 670.926 23.463 13MB044-29 76.124 6018.801 2.161 16.024498 2.84 0.9476166 3.42 0.1101326 1.92 673.51782 12.27 676.86081 16.92 688.0028 60.531 673.518 12.27 13MB044-171 383.78 312508 2.766 15.988836 1.41 0.9746306 4.4 0.1130201 4.17 690.26343 27.31 690.8477 22.07 692.72934 30.004 690.263 27.305 13MB044-258 122.97 39351.82 2.97 15.604844 2.78 1.0635507 4.1 0.1203695 3.02 732.68985 20.94 735.57203 21.49 744.33928 58.683 732.69 20.943 13MB044-39 279.12 36169.4 1.354 15.672533 2.17 1.0764089 6.79 0.1223532 6.43 744.09361 45.22 741.87939 35.75 735.22232 45.87 744.094 45.218 13MB044-143 98.725 63473.74 0.984 15.224642 1.96 1.1741165 2.9 0.1296454 2.14 785.84204 15.84 788.56918 15.92 796.26955 41.117 785.842 15.841 13MB044-274 142.43 48274.59 1.503 14.277983 2.49 1.2687056 3.42 0.1313791 2.34 795.72841 17.54 831.81137 19.4 929.47382 51.06 795.728 17.542 13MB044-41 256.03 30590.51 4.341 14.450791 1.97 1.2981437 3.77 0.1360546 3.21 822.31332 24.81 844.90199 21.62 904.69977 40.563 822.313 24.808 13MB044-198 175.55 118050.3 0.862 14.360792 1.77 1.4129255 2.79 0.1471622 2.16 885.03641 17.83 894.3899 16.58 917.60155 36.345 917.602 36.345 13MB044-281 174.11 35634.14 0.856 13.891677 2.33 1.5922018 3.57 0.1604174 2.71 959.09608 24.17 967.1601 22.28 985.55199 47.343 985.552 47.343 13MB044-244 557.74 25087.62 4.564 13.681544 2.45 1.6887765 2.92 0.1675738 1.58 998.72931 14.65 1004.3014 18.62 1016.4615 49.73 1016.46 49.73 13MB044-267 564.07 58691.52 1.338 13.433882 2.5 1.7067534 4.43 0.1662919 3.65 991.64784 33.59 1011.0676 28.37 1053.403 50.451 1053.4 50.451 13MB044-182 57.074 67050.46 1.559 12.465967 2.46 2.2236587 4.66 0.2010448 3.96 1180.9305 42.72 1188.5231 32.67 1202.3558 48.548 1202.36 48.548 13MB044-147 256.66 128715.4 2.949 12.093051 2.71 2.1254643 4.71 0.1864182 3.86 1101.9429 39.08 1157.1131 32.57 1261.9405 52.939 1261.94 52.939 13MB044-80 154.42 54112.75 2.391 11.41993 2.1 2.9201737 3.42 0.2418638 2.7 1396.3791 33.9 1387.1513 25.88 1372.9676 40.413 1372.97 40.413 13MB044-5 1088.2 233896.8 1.598 11.367201 1.55 2.763724 3.23 0.2278489 2.83 1323.2154 33.88 1345.7977 24.08 1381.8642 29.821 1381.86 29.821 13MB044-170 273.71 464284.7 1.273 9.7743978 1.96 4.1652719 3.45 0.2952787 2.84 1667.8541 41.75 1667.2161 28.26 1666.3946 36.233 1666.39 36.233 13MB044-216 122.4 85118.55 1.628 9.6323305 1.53 4.2700106 2.67 0.298304 2.19 1682.8931 32.36 1687.5995 21.95 1693.4371 28.229 1693.44 28.229 13MB044-179 83.196 45645.04 3.644 9.5474398 1.97 4.0640015 3.15 0.28141 2.47 1598.4595 34.92 1647.1107 25.71 1709.7388 36.179 1709.74 36.179 13MB044-53 303.1 52929.03 1.44 9.5349729 1.82 4.3678079 2.91 0.302052 2.28 1701.4761 34.04 1706.2696 24.08 1712.1427 33.46 1712.14 33.46 13MB044-259 100.78 31523.3 2.507 9.5232528 2.16 4.0318632 4.25 0.2784773 3.66 1583.6891 51.35 1640.6461 34.56 1714.4049 39.695 1714.4 39.695 13MB044-47 53.624 42353.69 1.436 9.4164754 2.22 4.3797464 4.56 0.2991135 3.98 1686.9114 59.12 1708.5254 37.73 1735.1134 40.808 1735.11 40.808 13MB044-141 19.754 47054.3 1.018 9.1021433 2.36 4.9802683 4.49 0.3287722 3.81 1832.4279 60.83 1815.9775 37.95 1797.1391 43 1797.14 43 13MB044-175 190.29 242413.7 2.705 9.060237 1.24 4.3974316 3.44 0.2889598 3.21 1636.3288 46.41 1711.8579 28.47 1805.534 22.465 1805.53 22.465 13MB044-108 153.32 46660.68 2.485 9.0424377 1.49 4.9498092 2.79 0.3246181 2.35 1812.2429 37.19 1810.7927 23.55 1809.1088 27.128 1809.11 27.128 13MB044-181 124.29 68302.45 2.653 9.0184024 1.23 5.2379517 2.45 0.3426019 2.12 1899.1747 34.86 1858.8129 20.89 1813.9447 22.331 1813.94 22.331 13MB044-55 583.3 156402.9 3.225 8.9975922 1.37 3.5223379 3.43 0.2298561 3.15 1333.7449 37.92 1532.2426 27.17 1818.1361 24.962 1818.14 24.962 13MB044-132 169.14 60045.26 1.7 8.960666 1.86 4.953604 3.12 0.3219291 2.51 1799.1436 39.4 1811.4401 26.41 1825.5988 33.771 1825.6 33.771 13MB044-67 234.11 133375.9 1.789 8.958654 1.51 5.1302814 3.08 0.3333364 2.68 1854.5324 43.26 1841.1338 26.16 1826.0061 27.33 1826.01 27.33 13MB044-86 598.78 39107859 1.952 8.9577222 0.9 4.9572279 2.25 0.3220588 2.06 1799.7759 32.34 1812.0579 19 1826.1948 16.399 1826.19 16.399 13MB044-183 85.428 53137.69 1.43 8.8959761 2.1 5.0753593 3.98 0.3274607 3.38 1826.0618 53.73 1831.9959 33.75 1838.7303 37.98 1838.73 37.98 13MB044-188 286.12 83503.73 3.489 8.8948506 1.87 4.8020269 2.78 0.3097861 2.06 1739.6542 31.45 1785.2539 23.4 1838.9594 33.858 1838.96 33.858 13MB044-81 371.08 55954.15 2.411 8.8849869 1.37 5.2603369 3.13 0.3389761 2.82 1881.7419 45.95 1862.4501 26.74 1840.9684 24.887 1840.97 24.887 13MB044-191 92.918 311715.9 1.027 8.8831734 1.63 5.1727253 2.86 0.3332624 2.35 1854.1747 37.91 1848.1398 24.34 1841.338 29.432 1841.34 29.432 13MB044-72 202.32 46287.8 2.516 8.8605012 2.18 5.3784802 3.34 0.3456341 2.53 1913.717 41.87 1881.4336 28.59 1845.963 39.435 1845.96 39.435 13MB044-42 706.86 52852.84 2.971 8.8417952 1.54 5.0388114 2.89 0.3231226 2.44 1804.9606 38.4 1825.8691 24.46 1849.786 27.925 1849.79 27.925 13MB044-197 140.81 1993180 1.835 8.8332323 2.13 4.9727934 3.14 0.3185802 2.3 1782.7917 35.87 1814.7075 26.52 1851.5381 38.513 1851.54 38.513 13MB044-95 550.17 121472.8 2.557 8.8309842 1.26 5.1780949 3.56 0.3316483 3.33 1846.3661 53.47 1849.0227 30.3 1851.9983 22.706 1852 22.706 13MB044-100 704.53 139502.3 3.146 8.8186535 1.6 5.2842766 3.06 0.3379765 2.6 1876.9278 42.37 1866.3256 26.09 1854.5203 28.946 1854.52 28.946 13MB044-70 78.396 43197.97 0.819 8.8185939 1.77 5.1005233 3.18 0.3262217 2.64 1820.0422 41.92 1836.1929 27.01 1854.5326 31.961 1854.53 31.961 13MB044-76 923.57 76069.59 5.141 8.8161299 1.47 5.2432552 2.72 0.3352569 2.29 1863.8111 37.09 1859.6758 23.2 1855.0376 26.496 1855.04 26.496 13MB044-73 765.92 106421.3 3.071 8.8098952 1.48 5.3682009 2.44 0.3430032 1.93 1901.1013 31.85 1879.7959 20.88 1856.3162 26.834 1856.32 26.834 13MB044-24 384.44 112025.6 3.826 8.8091106 1.37 5.2607764 2.88 0.3361094 2.53 1867.9255 41.04 1862.5214 24.56 1856.4771 24.786 1856.48 24.786 13MB044-94 230.53 243069.5 1.272 8.8053457 2.35 5.2396328 3.48 0.3346154 2.56 1860.7136 41.37 1859.0865 29.64 1857.2495 42.479 1857.25 42.479 13MB044-101 386.32 92678.28 2.508 8.8033941 1.59 5.4309239 4.07 0.3467549 3.75 1919.084 62.25 1889.7479 34.94 1857.65 28.737 1857.65 28.737 13MB044-1 185.15 113476.6 2.455 8.7895104 1.09 5.0747103 2.65 0.3235003 2.42 1806.8007 38.07 1831.8874 22.5 1860.5012 19.755 1860.5 19.755 13MB044-142 246.72 287355.1 4.168 8.7862101 1.66 5.1865117 2.75 0.3305032 2.2 1840.8201 35.22 1850.405 23.45 1861.1795 29.96 1861.18 29.96 13MB044-271 200.09 37699.25 2.835 8.7782959 3.51 5.0469894 3.92 0.3213226 1.75 1796.1853 27.4 1827.2433 33.21 1862.8069 63.314 1862.81 63.314 13MB044-302 431.88 80282.73 5.852 8.7777467 1.3 5.2840678 2.86 0.3363955 2.55 1869.3057 41.37 1866.2918 24.46 1862.9198 23.555 1862.92 23.555 13MB044-245 461.54 59992.01 3.271 8.738845 1.49 5.3043346 2.78 0.3361891 2.35 1868.3103 38.13 1869.5613 23.77 1870.936 26.83 1870.94 26.83 13MB044-221 543.31 52271.67 1.951 8.7338304 1.35 5.3473971 4.71 0.338724 4.51 1880.5279 73.52 1876.4734 40.27 1871.9714 24.373 1871.97 24.373 13MB044-115 227.28 263448.6 4.45 8.7337285 2.37 4.9576869 4.22 0.3140346 3.49 1760.5302 53.72 1812.1362 35.66 1871.9924 42.822 1871.99 42.822 13MB044-15 269.86 159559.2 1.86 8.7295875 1.63 5.0703393 3.14 0.3210181 2.69 1794.6991 42.16 1831.1565 26.68 1872.8478 29.34 1872.85 29.34 13MB044-4 329.38 143519.2 3.45 8.7249694 1.52 5.3824561 2.28 0.3405988 1.7 1889.5497 27.78 1882.0663 19.53 1873.802 27.478 1873.8 27.478 13MB044-2 904.21 51940.96 2.417 8.7227705 1.67 5.2905899 3.8 0.3347012 3.41 1861.1278 55.17 1867.3451 32.46 1874.2566 30.134 1874.26 30.134 13MB044-234 377.25 128808.4 3.173 8.71365 1.54 5.2415792 2.87 0.3312539 2.42 1844.4562 38.83 1859.4032 24.45 1876.1427 27.701 1876.14 27.701 13MB044-46 265.27 399540.8 3.362 8.7018701 1.74 5.6320469 5.82 0.3554492 5.56 1960.5669 93.93 1921.0169 50.25 1878.5811 31.373 1878.58 31.373 13MB044-317 215.46 26223.57 3.848 8.6930818 2.06 5.3283625 3.16 0.3359435 2.39 1867.1251 38.73 1873.4239 26.98 1880.4019 37.143 1880.4 37.143

153 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB044-252 714.31 70347.81 2.806 8.6920072 1.23 5.0126353 4.92 0.3159984 4.76 1770.1572 73.74 1821.4582 41.66 1880.6247 22.11 1880.62 22.11 13MB044-254 499.59 140580.6 2.366 8.6902806 1.6 5.3494235 2.47 0.3371627 1.88 1873.0055 30.6 1876.7975 21.16 1880.9826 28.904 1880.98 28.904 13MB044-243 333.38 35542.04 7.141 8.6712689 1.62 5.1827287 4.02 0.3259416 3.68 1818.6809 58.3 1849.7839 34.22 1884.9276 29.126 1884.93 29.126 13MB044-263 808.87 57571.6 2.323 8.6662399 1.65 5.4492154 3.38 0.3425022 2.95 1898.696 48.6 1892.6319 29.02 1885.9722 29.627 1885.97 29.627 13MB044-285 369.93 47755.72 3.236 8.6610945 2.06 5.1481799 3.18 0.323389 2.43 1806.2585 38.2 1844.0941 27.08 1887.0415 37.157 1887.04 37.157 13MB044-189 340.98 186253.1 4.623 8.6493231 1.8 5.2151056 4.09 0.3271478 3.67 1824.5421 58.34 1855.0873 34.87 1889.4898 32.461 1889.49 32.461 13MB044-185 812.97 373520 3.937 8.6259341 1.31 5.2747145 2.64 0.3299923 2.3 1838.3443 36.71 1864.7794 22.54 1894.3582 23.484 1894.36 23.484 13MB044-238 556.75 106689.9 3.316 8.6241502 1.65 5.4713851 2.66 0.3422255 2.08 1897.3668 34.22 1896.1163 22.82 1894.7302 29.714 1894.73 29.714 13MB044-118 90.157 111705.4 0.655 8.6202561 1.53 5.1463631 2.58 0.3217506 2.07 1798.2727 32.55 1843.794 21.9 1895.5425 27.454 1895.54 27.454 13MB044-301 811.26 141313.4 2.647 8.5908608 1.45 5.4805132 2.87 0.3414732 2.48 1893.7529 40.69 1897.5476 24.66 1901.684 26.035 1901.68 26.035 13MB044-7 183.89 63867.53 1.298 8.566023 1.44 5.3030012 2.69 0.3294577 2.27 1835.7527 36.21 1869.3465 22.95 1906.8861 25.898 1906.89 25.898 13MB044-158 304.9 246852.3 3.56 8.5439357 1.94 5.7291558 2.94 0.3550155 2.21 1958.5038 37.38 1935.7767 25.44 1911.5221 34.803 1911.52 34.803 13MB044-266 1026.4 105897.6 4.659 8.5008369 1.72 5.5515282 2.67 0.3422732 2.04 1897.5963 33.47 1908.6138 22.95 1920.5954 30.891 1920.6 30.891 13MB044-319 613.04 90163.1 13.76 8.4869939 1.6 5.4025378 2.71 0.332545 2.19 1850.7052 35.19 1885.2561 23.24 1923.5174 28.741 1923.52 28.741 13MB044-113 252.52 306861.7 4.696 8.478074 1.29 5.4539871 2.8 0.335359 2.48 1864.3043 40.13 1893.3828 24 1925.4022 23.191 1925.4 23.191 13MB044-295 1191.2 160528.1 9.654 8.3982098 1.44 5.3740412 3.4 0.3273305 3.08 1825.4296 48.93 1880.7267 29.11 1942.3439 25.834 1942.34 25.834 13MB044-224 465.98 200532.1 3.614 8.273684 1.56 5.9383487 2.27 0.356339 1.65 1964.7971 27.93 1966.8618 19.74 1969.0173 27.831 1969.02 27.831 13MB044-102 389.38 191039.2 2.256 8.2552521 1.63 5.6560709 4.56 0.3386444 4.25 1880.1448 69.37 1924.6884 39.32 1972.993 29.038 1972.99 29.038 13MB044-230 212.06 316804.7 3.668 8.1993333 1.61 5.7793502 2.77 0.3436816 2.26 1904.3565 37.29 1943.3226 24.01 1985.0975 28.564 1985.1 28.564 13MB044-50 301.35 170728 2.608 8.1788868 1.73 6.0258196 3.35 0.3574449 2.86 1970.0509 48.62 1979.5826 29.14 1989.5398 30.762 1989.54 30.762 13MB044-56 450 82775.94 3.021 8.1255236 1.59 6.0159276 3.76 0.3545297 3.41 1956.1924 57.58 1978.1519 32.77 2001.1712 28.178 2001.17 28.178 13MB044-194 44.398 33259.3 1.435 8.0552568 1.77 6.2423687 3.3 0.3646931 2.78 2004.3807 47.97 2010.406 28.91 2016.5857 31.47 2016.59 31.47 13MB044-21 530.91 180162.4 12.08 7.8715589 1.9 6.4581712 3.22 0.3686965 2.6 2023.264 45.2 2040.2196 28.33 2057.3909 33.514 2057.39 33.514 13MB044-154 335.01 121171.7 3.735 7.7785073 1.7 6.3364144 3.33 0.3574691 2.87 1970.1663 48.67 2023.5063 29.25 2078.3492 29.989 2078.35 29.989 13MB044-190 77.852 98937.41 1.987 7.741521 1.83 6.6112682 3.4 0.3712016 2.87 2035.0518 50.09 2060.8517 30.02 2086.7373 32.145 2086.74 32.145 13MB044-288 103.49 24753.84 1.882 7.7235538 1.98 7.000597 4.14 0.3921489 3.63 2132.7865 65.94 2111.5055 36.77 2090.8237 34.834 2090.82 34.834 13MB044-12 344 165676.6 1.6 7.6872103 1.89 7.1365111 3.12 0.3978812 2.49 2159.2759 45.61 2128.6099 27.83 2099.1128 33.255 2099.11 33.255 13MB044-111 189.35 62431.37 1.872 7.6584888 1.52 6.8300998 2.47 0.3793751 1.95 2073.364 34.5 2089.6332 21.87 2105.6857 26.669 2105.69 26.669 13MB044-298 1077.2 72881.96 2.62 7.6452193 1.59 6.638633 3.46 0.3681013 3.07 2020.46 53.25 2064.4958 30.51 2108.7291 27.841 2108.73 27.841 13MB044-30 540.11 231691.4 6.934 7.6182918 2.23 6.1707727 3.13 0.3409541 2.2 1891.2577 36.14 2000.3182 27.4 2114.9137 39.067 2114.91 39.067 13MB044-117 382.02 254442.3 3.025 7.6044097 1.7 6.7434715 4.03 0.3719185 3.65 2038.4213 63.79 2078.3369 35.62 2118.1113 29.802 2118.11 29.802 13MB044-104 553.35 80247.58 1.674 7.5181174 1.63 7.0726791 3.23 0.3856486 2.79 2102.6163 50.14 2120.6127 28.78 2138.0935 28.471 2138.09 28.471 13MB044-52 1383.3 18328.12 5.82 7.3444489 7.16 6.4104674 9.26 0.3414661 5.88 1893.7189 96.46 2033.7041 81.53 2178.8713 124.77 2178.87 124.77 13MB044-103 309.02 63003.02 1.271 7.0544856 2.24 8.2168585 3.79 0.4204069 3.06 2262.3266 58.4 2255.2005 34.34 2248.7276 38.693 2248.73 38.693 13MB044-261 1060.5 145035.1 2.828 6.7005617 1.76 8.1818734 4.49 0.3976149 4.13 2158.0478 75.79 2251.339 40.65 2337.2378 30.07 2337.24 30.07 13MB044-206 115.59 93413.52 3.31 6.6388851 1.97 7.8685388 2.77 0.378868 1.95 2070.9937 34.55 2216.0837 24.96 2353.0486 33.618 2353.05 33.618 13MB044-270 104.59 23133.53 1.47 6.5539221 1.92 9.3293766 3.08 0.4434581 2.41 2366.1029 47.74 2370.9112 28.25 2375.035 32.664 2375.04 32.664 13MB044-59 98.911 33214.31 1.369 6.4284338 1.66 9.3174783 2.59 0.4344125 1.99 2325.5784 38.93 2369.741 23.79 2407.9366 28.193 2407.94 28.193 13MB044-174 133 265160.7 0.822 6.3142367 2.2 10.0995 4 0.4625082 3.35 2450.6232 68.29 2443.9255 37.02 2438.3413 37.185 2438.34 37.185 13MB044-161 91.871 1353889 2.094 6.1845494 1.93 10.197143 3.42 0.4573885 2.82 2428.0172 57.13 2452.8188 31.64 2473.4282 32.587 2473.43 32.587 13MB044-215 135.85 252259.1 3.287 6.1584054 1.39 11.124841 3.03 0.4968906 2.69 2600.4194 57.64 2533.641 28.25 2480.5766 23.452 2480.58 23.452 13MB044-287 439.2 174948.5 5.364 6.1405217 2.16 10.774214 3.46 0.4798324 2.7 2526.5357 56.47 2503.8451 32.15 2485.4809 36.421 2485.48 36.421 13MB044-219 67.883 157779.3 0.603 6.1342632 1.48 10.582423 3.05 0.4708106 2.66 2487.1149 54.91 2487.1693 28.27 2487.2 25.013 2487.2 25.013 13MB044-167 146.35 113015.5 0.833 6.0982355 2.41 11.087313 5.72 0.490376 5.18 2572.3027 109.9 2530.4934 53.28 2497.1245 40.64 2497.12 40.64 13MB044-6 116.69 70603.26 1.585 6.0735348 1.4 10.624412 3.24 0.4679992 2.92 2474.7811 60.05 2490.8436 30.06 2503.957 23.479 2503.96 23.479 13MB044-124 24.697 31044.41 1.09 6.0694681 2.04 9.9147354 2.83 0.436446 1.96 2334.7106 38.3 2426.881 26.07 2505.0841 34.335 2505.08 34.335 13MB044-253 504.45 140952.5 2.579 6.0516201 1.6 10.838219 3.08 0.4756947 2.64 2508.4857 54.76 2509.3498 28.66 2510.0323 26.883 2510.03 26.883 13MB044-166 240.37 133631.8 0.623 6.0484061 1.76 10.595953 5.4 0.4648145 5.11 2460.7809 104.5 2488.3548 50.18 2510.9258 29.597 2510.93 29.597 13MB044-34 184.56 157209.5 1.756 6.0182818 0.92 10.87021 2.47 0.4744705 2.29 2503.1356 47.48 2512.0901 22.94 2519.3191 15.432 2519.32 15.432 13MB044-180 58.349 84928.64 0.926 6.0131382 1.74 10.697131 2.97 0.4665167 2.41 2468.2677 49.32 2497.1758 27.57 2520.7557 29.215 2520.76 29.215 13MB044-61 46.928 34824.31 0.653 5.9582333 2.38 10.762751 6.38 0.4650927 5.92 2462.0049 121.2 2502.8561 59.38 2536.1548 39.952 2536.15 39.952 13MB044-232 1566.2 869513.8 25.52 5.9179454 1.32 10.361025 3.6 0.4447054 3.35 2371.6707 66.5 2467.5723 33.36 2547.5297 22.11 2547.53 22.11 13MB044-299 190.13 140611.4 1.808 5.8998392 1.64 11.084598 3.38 0.4743063 2.96 2502.4177 61.33 2530.2653 31.5 2552.6628 27.461 2552.66 27.461 13MB044-315 364.12 263021.8 1.544 5.8850056 1.41 11.195147 2.88 0.4778322 2.51 2517.8165 52.36 2539.5117 26.86 2556.8721 23.615 2556.87 23.615 13MB044-74 260.71 95215.33 2.245 5.78967 1.66 11.521323 2.98 0.4837878 2.47 2543.7429 51.92 2566.3127 27.83 2584.1779 27.762 2584.18 27.762 13MB044-214 38.321 54883.96 1.17 5.7641818 2.02 11.080185 4.95 0.4632159 4.52 2453.7415 92.22 2529.8944 46.12 2591.5418 33.69 2591.54 33.69 13MB044-322 801.34 95697.18 2.899 5.6880576 2.53 10.736634 5.2 0.4429257 4.54 2363.7245 89.91 2500.5991 48.34 2613.6933 42.138 2613.69 42.138 13MB044-11 769.49 62295.71 2.38 5.6728079 1.36 10.632116 2.58 0.437438 2.19 2339.1612 43.02 2491.5164 23.98 2618.1619 22.707 2618.16 22.707 13MB044-33 141.89 55217.3 1.243 5.2914416 1.55 13.257621 2.74 0.5087897 2.26 2651.4607 49.09 2698.1689 25.87 2733.3338 25.528 2733.33 25.528 13MB044-36 303.54 102443.3 1.026 4.1225366 2.18 16.791401 4.21 0.5020537 3.6 2622.6159 77.6 2922.9987 40.34 3136.8949 34.581 3136.89 34.581 13MB044-308 315.2 84147.69 2.5 3.1699025 1.73 30.226465 2.7 0.6949155 2.07 3401.34 54.84 3494.2031 26.58 3547.8672 26.709 3547.87 26.709 13MB054b 13MB054b-61 1259.1 27992.33 1.496 20.935437 4.41 0.0449508 5.49 0.0068252 3.28 43.848837 1.433 44.64615 2.4 87.713215 104.54 43.8488 1.4331 13MB054b-239 558.84 18210.49 3.436 21.031636 4.43 0.0459896 6.13 0.0070151 4.24 45.064092 1.903 45.655084 2.735 76.78575 105.17 45.0641 1.9029 13MB054b-24 1201.1 96495.8 1.294 21.676633 2.79 0.0450692 4.03 0.0070855 2.91 45.514976 1.319 44.761215 1.765 4.5363832 67.206 45.515 1.3193 13MB054b-212 710.65 45606.68 1.843 21.611178 4.56 0.0458944 5.49 0.0071934 3.07 46.205886 1.413 45.562639 2.448 11.832662 109.63 46.2059 1.4126 13MB054b-103 678.02 34050.78 1.793 21.355315 5.67 0.0466303 6.25 0.0072223 2.63 46.39035 1.216 46.276872 2.828 40.424276 135.7 46.3904 1.2159 13MB054b-117 1178.4 27202.15 1.46 20.730063 3.33 0.0486368 3.81 0.0073125 1.86 46.967757 0.869 48.221628 1.794 110.99005 78.542 46.9678 0.8692 13MB054b-201 1469.5 144575.8 1.704 21.300966 2 0.0483413 3.14 0.0074682 2.42 47.964292 1.154 47.935439 1.469 46.490192 47.855 47.9643 1.1542 13MB054b-157 1003.9 27608.83 1.385 20.516599 4.22 0.0503016 5.25 0.0074849 3.11 48.071052 1.49 49.832298 2.551 135.36994 99.317 48.0711 1.4899 13MB054b-189 1492.9 26614.22 2.843 21.162717 2.61 0.0489592 3.82 0.0075146 2.79 48.260943 1.343 48.533699 1.812 62.051431 62.197 48.2609 1.3426 13MB054b-190 1053.7 27103.85 1.638 21.152923 3.77 0.0492558 4.46 0.0075566 2.37 48.529821 1.147 48.820758 2.124 63.106754 89.862 48.5298 1.1465 13MB054b-134 2407.3 148490.9 0.729 20.868413 1.83 0.0523686 2.75 0.0079261 2.06 50.893483 1.042 51.828674 1.392 95.263895 43.403 50.8935 1.0422 13MB054b-243 2050.6 62081.71 2.689 16.834377 2.05 0.2460803 3.45 0.030045 2.77 190.83011 5.214 223.3872 6.917 581.86967 44.532 190.83 5.2141 13MB054b-271 1222.5 74953.39 2.938 19.018099 1.94 0.228775 3.37 0.0315555 2.75 200.27597 5.433 209.18692 6.371 310.75762 44.175 200.276 5.4327 13MB054b-250 447.45 41043.13 1.713 19.912755 3.12 0.219183 4.56 0.0316546 3.33 200.89563 6.587 201.22962 8.333 205.15228 72.445 200.896 6.5872 13MB054b-297 232.86 109595.7 2.228 20.44345 4.48 0.2176473 5.7 0.0322705 3.53 204.74313 7.115 199.94977 10.35 143.78591 105.13 204.743 7.1153

154 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB054b-249 2214.7 143347.3 3.217 19.018851 2.16 0.2341769 3.34 0.0323018 2.55 204.93856 5.143 213.64095 6.438 310.70269 49.161 204.939 5.1433 13MB054b-13 1012.1 47631.21 4.48 19.244434 2.38 0.231611 3.84 0.0323268 3.01 205.09466 6.068 211.52772 7.326 283.80711 54.531 205.095 6.0685 13MB054b-31 1541.9 49887.95 3.459 18.814974 1.57 0.2371533 3.06 0.0323617 2.63 205.3125 5.316 216.08671 5.961 335.17069 35.533 205.312 5.316 13MB054b-294 844.08 53452.16 1.218 20.250385 2.58 0.2206203 3.46 0.0324024 2.3 205.56673 4.657 202.42595 6.344 165.97446 60.28 205.567 4.6571 13MB054b-38 1048.2 163879.5 2.058 19.668482 1.85 0.227828 3.51 0.0324995 2.98 206.17282 6.056 208.40407 6.619 233.73034 42.78 206.173 6.0562 13MB054b-5 184.64 39093.86 1.537 18.921422 3.96 0.2375892 4.8 0.0326046 2.71 206.82911 5.51 216.44439 9.352 322.39123 89.975 206.829 5.5101 13MB054b-247 1327.1 55651.67 3.359 20.064845 1.72 0.224904 6.27 0.0327289 6.03 207.6051 12.32 205.98314 11.69 187.44085 39.953 207.605 12.321 13MB054b-183 640.73 128699 3.163 19.21163 2.29 0.2352687 3.88 0.0327814 3.13 207.93248 6.408 214.5388 7.504 287.69952 52.356 207.932 6.4082 13MB054b-298 356.54 25294.53 2.832 19.951255 2.67 0.22664 4.28 0.0327948 3.35 208.01652 6.862 207.42114 8.037 200.68473 61.931 208.017 6.8618 13MB054b-87 614.24 61214.45 1.901 19.630052 2.39 0.2304356 4.06 0.0328072 3.28 208.09391 6.71 210.55817 7.712 238.23708 55.125 208.094 6.71 13MB054b-253 2021.1 118955.4 2.497 19.854404 2.12 0.2283911 3.12 0.0328878 2.28 208.59671 4.689 208.86964 5.887 211.92719 49.184 208.597 4.6889 13MB054b-290 548.4 41808.53 1.772 19.795068 1.72 0.2292153 3.14 0.0329078 2.63 208.7218 5.394 209.5507 5.947 218.88857 39.876 208.722 5.3942 13MB054b-234 373.25 25313.31 1.828 19.950888 3.47 0.2278376 4.56 0.0329675 2.97 209.09428 6.103 208.412 8.595 200.71264 80.486 209.094 6.1027 13MB054b-41 708.54 78661.56 1.767 19.097425 2.15 0.2383618 3.5 0.0330149 2.76 209.39003 5.692 217.07811 6.839 301.31936 48.945 209.39 5.6924 13MB054b-131 532.11 79098.34 1.504 19.324003 2.56 0.2357877 3.96 0.0330459 3.02 209.58311 6.232 214.96532 7.678 274.31828 58.738 209.583 6.2321 13MB054b-113 329.81 164119.2 2.511 19.729167 2.59 0.2313311 4.82 0.033101 4.06 209.92741 8.392 211.29695 9.19 226.60254 59.811 209.927 8.3922 13MB054b-48 644.77 111892 2.752 20.021103 2.34 0.2280888 3.07 0.03312 1.99 210.0459 4.107 208.61969 5.79 192.56366 54.421 210.046 4.1071 13MB054b-91 707.14 78558.85 1.676 19.412954 2.6 0.2354721 4.61 0.0331535 3.8 210.25503 7.865 214.70598 8.917 263.78616 59.745 210.255 7.8646 13MB054b-175 512.87 43644.07 2.291 19.107662 2.74 0.2398608 4.09 0.0332403 3.03 210.79665 6.278 218.30644 8.027 300.09742 62.59 210.797 6.2785 13MB054b-217 418.09 47974.53 3.205 19.860446 2.17 0.2308504 3.47 0.033252 2.71 210.86966 5.618 210.90047 6.614 211.23519 50.401 210.87 5.618 13MB054b-281 785.3 102448.1 2.08 19.214235 2.11 0.2388225 3.75 0.0332811 3.1 211.05062 6.444 217.45578 7.347 287.39825 48.238 211.051 6.4444 13MB054b-71 372.82 76392.65 2.267 19.24067 2.27 0.238561 3.41 0.0332903 2.55 211.10862 5.297 217.24142 6.673 284.23272 51.846 211.109 5.2967 13MB054b-172 995.34 77976.43 2.613 18.851752 2.99 0.2436803 4.3 0.0333174 3.09 211.27725 6.417 221.4296 8.552 330.76443 67.838 211.277 6.4165 13MB054b-245 1001.1 80743.14 2.107 19.170633 1.54 0.2396946 3.27 0.0333268 2.89 211.33596 6.001 218.17036 6.419 292.54446 35.065 211.336 6.0014 13MB054b-70 384.92 71344.98 2.248 19.697654 2.26 0.2347635 3.69 0.0335385 2.92 212.65662 6.107 214.12339 7.133 230.26345 52.336 212.657 6.1068 13MB054b-204 218.25 132483.6 1.574 18.950247 3.43 0.2441739 4.53 0.0335593 2.96 212.78629 6.193 221.83255 9.03 318.88792 78.021 212.786 6.1927 13MB054b-75 664.21 37677.23 2.612 19.943543 2.5 0.2320404 3.23 0.0335633 2.05 212.81121 4.288 211.88163 6.183 201.57704 58.09 212.811 4.2881 13MB054b-45 177.39 91010.68 1.618 19.234271 3.01 0.2411004 5.57 0.0336335 4.69 213.2492 9.843 219.32108 10.99 284.98944 68.77 213.249 9.8426 13MB054b-191 192.21 22573.19 2.624 20.623438 3.01 0.2255275 4.18 0.0337333 2.9 213.87169 6.098 206.49983 7.806 123.15 70.865 213.872 6.0983 13MB054b-97 324.8 44622.05 2.351 20.131988 3.44 0.2311551 4.63 0.0337512 3.11 213.98292 6.548 211.15177 8.836 179.65924 80.103 213.983 6.548 13MB054b-129 562.02 487920.1 2.312 19.270677 2.5 0.2416998 3.54 0.033781 2.5 214.16866 5.264 219.81137 6.988 280.68931 57.24 214.169 5.2645 13MB054b-301 388.73 38130.76 2.298 19.764062 3.72 0.2358892 7.9 0.0338129 6.96 214.3681 14.68 215.04868 15.3 222.5266 86.106 214.368 14.683 13MB054b-96 601.18 43954 2.004 19.611127 2.37 0.2377668 6.74 0.0338184 6.31 214.40188 13.31 216.59014 13.15 240.45361 54.585 214.402 13.307 13MB054b-306 198.01 24746.7 2.835 20.578831 4.06 0.2267486 5.14 0.0338426 3.15 214.55322 6.655 207.51107 9.644 128.29194 95.49 214.553 6.6547 13MB054b-278 787.3 94287.46 2.116 19.857103 2.39 0.2350347 4.26 0.0338491 3.53 214.59331 7.44 214.34641 8.227 211.61318 55.32 214.593 7.4403 13MB054b-315 711.06 44333.11 2.058 19.895169 2.64 0.2346636 4.19 0.0338604 3.25 214.66405 6.863 214.04129 8.084 207.20606 61.251 214.664 6.8633 13MB054b-79 628.49 52372.98 1.938 19.880119 2.54 0.2349557 3.16 0.0338769 1.88 214.76692 3.971 214.28146 6.108 208.93265 58.949 214.767 3.9713 13MB054b-279 689.59 46702.68 2.219 19.729147 2.46 0.2367673 3.25 0.0338789 2.13 214.77908 4.503 215.76984 6.323 226.6039 56.805 214.779 4.503 13MB054b-256 580.66 139224.5 1.947 19.516109 2.75 0.2395873 3.62 0.0339122 2.35 214.98691 4.976 218.08245 7.108 251.65083 63.372 214.987 4.9755 13MB054b-72 537 64100.8 2.536 19.865559 3.34 0.2354046 4.28 0.0339168 2.68 215.01551 5.661 214.65051 8.279 210.64349 77.386 215.016 5.6606 13MB054b-198 652.98 69794.53 3.663 19.096924 2.02 0.2449251 3.19 0.0339231 2.46 215.05488 5.212 222.44538 6.365 301.37957 46.064 215.055 5.2121 13MB054b-268 854.6 104274.6 1.903 19.552783 2.82 0.2392641 5.01 0.0339301 4.13 215.09851 8.743 217.81771 9.813 247.31202 65.046 215.099 8.7433 13MB054b-144 698.97 46407.9 1.278 19.996241 1.61 0.2340163 3.19 0.0339385 2.76 215.15128 5.834 213.50882 6.149 195.45174 37.466 215.151 5.8339 13MB054b-185 875.37 93294.17 2.289 19.702849 1.88 0.2375188 3.15 0.0339411 2.53 215.16715 5.363 216.3867 6.148 229.65535 43.384 215.167 5.3635 13MB054b-221 576.24 24210.29 1.671 19.98576 1.79 0.2342852 3.64 0.0339597 3.17 215.28338 6.718 213.73005 7.02 196.67112 41.547 215.283 6.7181 13MB054b-259 537.23 40628.65 1.393 19.369011 3.05 0.2420385 6.03 0.0340009 5.21 215.54015 11.04 220.08834 11.94 268.98427 69.981 215.54 11.037 13MB054b-237 455.03 45656.9 2.293 19.603273 2.63 0.2392677 3.57 0.0340182 2.41 215.64794 5.113 217.82065 7.001 241.34721 60.741 215.648 5.1126 13MB054b-100 639.34 52576.87 2.919 20.159764 2.09 0.232967 3.44 0.0340627 2.74 215.92509 5.809 212.64506 6.609 176.44585 48.836 215.925 5.8092 13MB054b-273 285.76 29996.85 2.927 18.687198 4.27 0.2513923 5.29 0.0340718 3.13 215.98193 6.645 227.70652 10.8 350.59141 96.499 215.982 6.6451 13MB054b-269 394.42 45907.57 2.184 19.785478 2.61 0.2376675 3.63 0.0341048 2.53 216.18751 5.369 216.50864 7.08 219.99937 60.375 216.188 5.3689 13MB054b-155 430.5 159964.7 1.698 19.466932 2.73 0.242182 4.03 0.0341931 2.97 216.738 6.319 220.20564 7.976 257.44873 62.696 216.738 6.3195 13MB054b-88 1345.2 57902.87 3.649 19.5175 1.72 0.2417976 4.65 0.0342275 4.32 216.95249 9.209 219.89139 9.19 251.48768 39.663 216.952 9.2094 13MB054b-82 261.47 83802.38 2.119 19.099848 2.74 0.2472278 4.07 0.0342473 3.01 217.07578 6.431 224.32178 8.191 301.02994 62.4 217.076 6.4306 13MB054b-309 515.53 103861.2 2.444 18.946394 3.26 0.2493931 6.27 0.0342697 5.35 217.21538 11.43 226.08311 12.7 319.39338 74.168 217.215 11.426 13MB054b-194 637.36 4820795 2.794 19.517631 2.59 0.2421469 4.65 0.0342772 3.86 217.26209 8.244 220.17695 9.204 251.47083 59.683 217.262 8.2445 13MB054b-179 817.72 116907.5 2.397 19.542113 2.14 0.2421391 6.18 0.034319 5.8 217.52319 12.4 220.17058 12.23 248.57446 49.192 217.523 12.403 13MB054b-246 993.74 68641.82 4.014 19.715296 1.74 0.2401192 2.91 0.0343344 2.33 217.61858 4.995 218.51803 5.73 228.21683 40.316 217.619 4.9949 13MB054b-161 525.92 37787.95 1.773 19.270712 1.86 0.24568 3.46 0.0343373 2.91 217.63698 6.237 223.06091 6.922 280.68524 42.52 217.637 6.2373 13MB054b-311 301.43 63472.85 2.494 19.810753 3.56 0.2390574 4.41 0.034348 2.61 217.70386 5.585 217.6483 8.642 217.02693 82.362 217.704 5.585 13MB054b-16 901.61 79743.88 2.713 19.708104 1.9 0.2404386 3.12 0.0343675 2.47 217.82507 5.293 218.77954 6.135 229.03863 43.894 217.825 5.2928 13MB054b-208 551.57 103847.4 2.811 18.922608 2.97 0.250555 4.38 0.0343861 3.22 217.94105 6.897 227.02694 8.912 322.2488 67.504 217.941 6.8969 13MB054b-98 469.37 149035.6 2.364 19.830885 1.93 0.2390992 3.97 0.034389 3.47 217.95885 7.443 217.68255 7.784 214.69263 44.691 217.959 7.4426 13MB054b-318 1066.6 237073.9 2.105 19.447941 2.19 0.2438424 5.04 0.0343939 4.54 217.98975 9.741 221.56195 10.04 259.65085 50.335 217.99 9.7407 13MB054b-226 468.06 74931.69 2.514 19.147416 2.66 0.2481299 3.25 0.0344578 1.87 218.38814 4.006 225.05595 6.551 295.34482 60.601 218.388 4.0059 13MB054b-80 795.51 43908.4 2.375 19.750822 2.35 0.2405577 3.81 0.034459 3.01 218.39559 6.453 218.87698 7.509 224.03394 54.321 218.396 6.4532 13MB054b-200 851.64 105009.3 2.091 19.339679 2.14 0.2456839 4.76 0.0344607 4.25 218.40623 9.134 223.06408 9.533 272.46023 49.017 218.406 9.1341 13MB054b-49 418.08 112676.1 2.452 19.169648 2.06 0.2478963 3.06 0.0344654 2.26 218.43506 4.845 224.86589 6.167 292.66339 47.134 218.435 4.8449 13MB054b-165 576.16 247831 2.074 19.316703 1.73 0.2460418 4.48 0.03447 4.13 218.46364 8.873 223.35584 8.977 275.18301 39.547 218.464 8.8728 13MB054b-255 353.51 58877.61 2.589 20.352358 3.14 0.2335269 4.16 0.0344707 2.73 218.46846 5.854 213.10604 7.995 154.2249 73.593 218.468 5.8541 13MB054b-254 423.92 210800.8 0.828 19.701137 3.43 0.2414617 4.64 0.0345015 3.12 218.66037 6.705 219.61666 9.162 229.85603 79.347 218.66 6.7051 13MB054b-328 1117.9 167218.3 2.564 20.074707 1.78 0.237073 2.63 0.0345168 1.94 218.75532 4.168 216.02081 5.122 186.29787 41.476 218.755 4.168 13MB054b-25 525.59 43887.2 1.698 19.72922 2.26 0.241415 3.4 0.034544 2.54 218.92523 5.474 219.57851 6.717 226.59897 52.245 218.925 5.4738 13MB054b-244 494.82 52085.38 2.747 20.326552 1.86 0.2343638 3.54 0.0345504 3.02 218.96492 6.492 213.79471 6.828 157.23678 43.478 218.965 6.4921 13MB054b-300 904 83594.89 2.614 20.154517 1.97 0.236515 3.62 0.0345724 3.05 219.10216 6.56 215.56271 7.04 177.05204 45.846 219.102 6.5599 13MB054b-121 416.9 43280.94 2.624 19.232552 2.34 0.2479504 3.4 0.034586 2.47 219.18679 5.326 224.90988 6.865 285.19534 53.497 219.187 5.3262 13MB054b-211 554.2 58153.71 1.274 19.414488 2.45 0.2456418 4.07 0.0345881 3.25 219.19992 7 223.02976 8.146 263.64498 56.257 219.2 6.9996 13MB054b-164 485.51 68921.19 1.857 19.301185 2.81 0.2474242 4.26 0.0346358 3.2 219.49686 6.912 224.48166 8.582 277.06819 64.38 219.497 6.9122

155 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB054b-133 404.87 144301.1 2.179 19.979237 2.75 0.2391358 3.68 0.0346515 2.44 219.59494 5.275 217.71252 7.204 197.42881 63.832 219.595 5.2749 13MB054b-184 228.73 32510.65 2.598 20.317298 3.33 0.2353845 4.5 0.0346851 3.02 219.80401 6.529 214.63396 8.703 158.26285 78.009 219.804 6.5291 13MB054b-263 1135.9 46618.16 2.24 18.286008 2.26 0.2616661 3.36 0.0347029 2.49 219.91481 5.386 236.00871 7.078 399.41244 50.544 219.915 5.3856 13MB054b-64 714.48 27771 1.394 20.377047 1.79 0.2350996 3.22 0.034745 2.68 220.17715 5.805 214.39975 6.231 151.40737 41.923 220.177 5.8054 13MB054b-111 851.89 211698.6 2.738 19.500387 2.25 0.2458986 3.6 0.0347775 2.81 220.37966 6.091 223.23908 7.219 253.45965 51.813 220.38 6.0905 13MB054b-42 326.11 89403.45 2.186 20.069098 2.48 0.2389894 3.97 0.0347861 3.1 220.43317 6.719 217.59256 7.772 186.94793 57.625 220.433 6.7194 13MB054b-39 430.56 48195.45 1.5 19.722714 2.68 0.2431938 5 0.0347871 4.22 220.43948 9.153 221.03233 9.938 227.37187 62.008 220.439 9.1527 13MB054b-214 377.06 117040.4 1.924 19.483163 2.73 0.2463617 3.29 0.0348122 1.84 220.59603 3.987 223.61649 6.608 255.50479 62.768 220.596 3.9873 13MB054b-3 534.95 85475.98 2.549 19.278785 2.79 0.2494633 4.23 0.0348807 3.18 221.02269 6.905 226.14012 8.573 279.72734 63.882 221.023 6.905 13MB054b-222 583.71 33555.49 2.32 19.283203 2.6 0.2495941 3.94 0.034907 2.97 221.18641 6.45 226.2464 7.999 279.20221 59.483 221.186 6.45 13MB054b-128 346.15 70150.56 2.184 19.14339 2.42 0.2514505 5.65 0.0349116 5.11 221.21544 11.1 227.75379 11.52 295.80946 55.156 221.215 11.103 13MB054b-124 352.28 241926.3 2.394 20.023256 1.99 0.2412219 3.49 0.0350308 2.87 221.95774 6.262 219.42052 6.89 192.31327 46.245 221.958 6.2619 13MB054b-8 387.82 31005.9 2.612 19.760346 2.36 0.2448315 4.05 0.0350882 3.29 222.3149 7.19 222.36906 8.085 222.92744 54.579 222.315 7.1898 13MB054b-142 381.06 30452.8 2.398 19.191339 2.84 0.2522064 3.73 0.0351043 2.42 222.41533 5.291 228.36688 7.63 290.10424 64.863 222.415 5.2909 13MB054b-223 515.36 49635.81 2.421 19.984753 2.65 0.2424551 4.26 0.0351422 3.34 222.6514 7.304 220.42883 8.443 196.77529 61.564 222.651 7.3039 13MB054b-236 618.08 43460.78 2.037 20.207185 2.87 0.2399072 3.84 0.0351599 2.56 222.76177 5.601 218.34444 7.549 170.96323 66.946 222.762 5.6011 13MB054b-4 599.11 52532.01 2.027 20.058873 2.12 0.2417163 3 0.035165 2.13 222.79371 4.657 219.82485 5.936 188.13466 49.355 222.794 4.6566 13MB054b-156 351.62 110118.7 2.534 18.842913 3.05 0.257556 4.27 0.035198 2.99 222.99919 6.558 232.69549 8.884 331.80797 69.162 222.999 6.5581 13MB054b-264 286.76 65482.85 1.81 21.083213 3.45 0.2307552 4.3 0.0352847 2.56 223.53914 5.628 210.82192 8.178 70.973517 82.027 223.539 5.6278 13MB054b-127 354.2 38711.37 2.224 19.545727 2.92 0.2494606 3.97 0.0353633 2.69 224.02807 5.912 226.1379 8.039 248.14557 67.187 224.028 5.9121 13MB054b-231 1078.9 95739.19 2.819 20.087945 2.25 0.243476 3.35 0.0354724 2.48 224.70738 5.48 221.26281 6.661 184.76279 52.44 224.707 5.4801 13MB054b-130 233.57 42040.46 1.587 19.366954 3.02 0.252902 4.49 0.0355232 3.33 225.02384 7.36 228.93075 9.212 269.22801 69.269 225.024 7.36 13MB054b-11 880.42 46757.23 2.282 15.74392 7.72 0.3115177 8.13 0.0355709 2.53 225.3204 5.606 275.35666 19.6 725.55241 164.01 225.32 5.6056 13MB054b-176 468.52 47551.56 2.116 19.06634 1.99 0.2573238 4.14 0.0355833 3.63 225.39777 8.033 232.508 8.595 304.98798 45.317 225.398 8.033 13MB054b-197 386.85 72491.34 2.228 19.866773 2.58 0.247172 3.15 0.0356144 1.8 225.59128 3.994 224.27636 6.334 210.50065 59.822 225.591 3.9939 13MB054b-192 366.19 177023.6 1.981 19.289889 3.43 0.2550726 4.63 0.0356855 3.1 226.03423 6.891 230.68832 9.551 278.40874 78.63 226.034 6.8913 13MB054b-219 304.01 46756.46 1.911 20.814095 2.7 0.2364054 4.04 0.0356873 3.01 226.04522 6.676 215.47273 7.845 101.43175 63.887 226.045 6.6762 13MB054b-44 403.29 59232.28 1.995 19.921039 2.36 0.248837 4.03 0.0359522 3.26 227.69396 7.291 225.63107 8.144 204.15837 54.83 227.694 7.2911 13MB054b-174 609.61 89453.8 2.039 19.56091 2.55 0.2535404 3.99 0.0359695 3.07 227.80178 6.878 229.44802 8.198 246.33909 58.704 227.802 6.8775 13MB054b-170 552.02 85177.03 3.201 19.020933 2.51 0.2612096 4.44 0.0360346 3.66 228.20656 8.212 235.64125 9.342 310.43354 57.215 228.207 8.2122 13MB054b-312 326.85 57774.71 2.178 19.667155 4.13 0.2528238 5.46 0.0360627 3.58 228.38143 8.027 228.86742 11.19 233.88599 95.244 228.381 8.0273 13MB054b-160 182.97 34729.17 2.878 19.100036 4.18 0.2606989 5.17 0.0361137 3.05 228.69881 6.847 235.23002 10.86 301.00845 95.359 228.699 6.8474 13MB054b-118 1332.4 142063.6 3.076 19.298898 1.96 0.2591432 2.6 0.036272 1.71 229.68327 3.853 233.9762 5.431 277.3403 44.887 229.683 3.8534 13MB054b-232 719.76 238478 2.493 19.793003 2.04 0.2543357 4.24 0.0365105 3.72 231.16699 8.447 230.09201 8.738 219.13175 47.299 231.167 8.4472 13MB054b-299 386.2 64417.63 2.681 20.361572 2.48 0.2490856 3.62 0.036784 2.64 232.86763 6.028 225.83314 7.334 153.19231 58.173 232.868 6.028 13MB054b-146 1170.2 72698.51 3.242 19.074796 1.88 0.2665825 4.51 0.0368799 4.1 233.46432 9.403 239.9577 9.644 303.99478 42.911 233.464 9.4029 13MB054b-182 385.45 249334.4 1.675 19.019801 3.02 0.2680651 3.75 0.0369781 2.22 234.0747 5.11 241.14552 8.048 310.55439 68.735 234.075 5.11 13MB054b-85 253.13 28529.28 0.35 19.983119 3.31 0.2557062 4.17 0.0370598 2.54 234.58253 5.854 231.20085 8.622 196.95495 76.829 234.583 5.854 13MB054b-213 583.81 40802.58 3.183 19.373001 2.45 0.2664631 4.51 0.0374397 3.78 236.94361 8.798 239.86195 9.626 268.51263 56.215 236.944 8.7977 13MB054b-187 47.48 91800.82 0.899 19.48999 5.79 0.2688058 6.58 0.037997 3.13 240.40527 7.39 241.73849 14.16 254.68961 133.19 240.405 7.3902 13MB054b-63 224.15 60638.57 1.167 19.043881 4.11 0.2756956 5.27 0.0380789 3.3 240.91383 7.805 247.23722 11.57 307.69163 93.704 240.914 7.8049 13MB054b-267 154.11 29313.35 1.538 20.206357 3.82 0.2624358 5.08 0.03846 3.35 243.28054 7.994 236.62796 10.73 171.05872 89.323 243.281 7.9938 13MB054b-92 68.783 26322.79 1.752 20.205984 7.86 0.2670211 8.41 0.0391313 2.98 247.44609 7.23 240.30921 17.99 171.10163 183.71 247.446 7.2302 13MB054b-173 24.679 4139.508 1.369 18.719106 5.09 0.2927984 6.73 0.0397514 4.41 251.29189 10.86 260.75967 15.49 346.73173 115.25 251.292 10.859 13MB054b-284 171.25 25119.22 0.531 19.101376 3.55 0.2911895 4.18 0.0403403 2.21 254.94194 5.513 259.49524 9.578 300.84783 81.058 254.942 5.5133 13MB054b-199 104.37 14446.28 1.998 19.126483 3.54 0.2922929 4.41 0.0405464 2.63 256.21877 6.605 260.36254 10.13 297.83352 80.832 256.219 6.6053 13MB054b-81 141.36 65059.12 1.116 18.676548 4 0.3012224 4.39 0.0408021 1.81 257.80293 4.568 267.35459 10.32 351.88145 90.44 257.803 4.5676 13MB054b-150 215.05 83672.71 2.188 19.678491 2.94 0.2871849 3.9 0.0409876 2.56 258.9515 6.498 256.34119 8.835 232.51093 67.941 258.951 6.4983 13MB054b-58 206.75 37221.48 3.45 19.613592 3.19 0.2923195 4.17 0.0415828 2.69 262.63636 6.911 260.38344 9.575 240.15984 73.537 262.636 6.9113 13MB054b-19 628.32 185118.5 1.551 19.444965 2.16 0.3044171 3.34 0.0429314 2.55 270.97758 6.772 269.84445 7.918 260.04696 49.559 270.978 6.7717 13MB054b-261 876.19 59631.05 2.537 19.24705 2.36 0.3077998 3.36 0.0429666 2.4 271.19533 6.364 272.47416 8.038 283.49578 53.988 271.195 6.3641 13MB054b-218 646.49 72612.01 3.607 19.482275 2.04 0.3048391 3.06 0.0430734 2.28 271.85518 6.073 270.17284 7.255 255.61074 46.846 271.855 6.0728 13MB054b-2 171.48 44654.44 1.255 18.87949 4.13 0.3151284 5.11 0.0431496 3.01 272.32602 8.019 278.14824 12.44 327.42196 93.823 272.326 8.0188 13MB054b-116 165.94 31843.84 1.598 18.078147 5.36 0.3339015 6.85 0.0437795 4.27 276.21778 11.54 292.54011 17.41 424.97279 119.58 276.218 11.54 13MB054b-302 406.54 40709.41 3.778 19.81011 2.52 0.3074569 4.19 0.0441743 3.35 278.65554 9.143 272.20787 10.01 217.11978 58.298 278.656 9.1432 13MB054b-139 153.79 46240.35 49.3 19.133135 2.68 0.3441737 3.59 0.0477598 2.4 300.75337 7.05 300.32947 9.343 297.0335 61.052 300.753 7.0499 13MB054b-293 325.03 66416.51 0.894 19.12162 2.62 0.3492172 4.63 0.0484305 3.82 304.87857 11.37 304.13214 12.17 298.38797 59.863 304.879 11.367 13MB054b-319 647.53 86658.71 5.231 19.319158 2.54 0.3475175 3.32 0.0486927 2.14 306.4903 6.395 302.85219 8.694 274.8927 58.231 306.49 6.3952 13MB054b-52 240.26 18681.09 1.817 18.684621 2.94 0.366 4.48 0.049598 3.38 312.05303 10.29 316.68453 12.18 350.92593 66.441 312.053 10.29 13MB054b-251 420.7 32346.26 4.007 19.439658 2.51 0.3678151 3.88 0.0518581 2.95 325.91948 9.385 318.03287 10.58 260.67407 57.622 325.919 9.3855 13MB054b-106 464.94 29311.67 1.298 19.01128 1.64 0.3789338 2.99 0.0522485 2.5 328.31109 7.999 326.25333 8.336 311.61132 37.285 328.311 7.9992 13MB054b-99 218.97 167523.6 1.936 18.612344 2.11 0.4488133 3.39 0.0605851 2.65 379.18256 9.759 376.44798 10.66 359.63482 47.623 379.183 9.7585 13MB054b-203 895.59 51449.6 8.264 18.027839 1.89 0.4676448 6.58 0.0611447 6.3 382.58302 23.4 389.56079 21.28 431.18485 42.151 382.583 23.401 13MB054b-159 289.5 41616.03 0.911 18.05434 2.21 0.4759721 4.34 0.0623249 3.73 389.7492 14.12 395.30573 14.21 427.91122 49.306 389.749 14.116 13MB054b-6 120.19 13448.47 2.098 17.597715 3.48 0.4896981 5.03 0.0625005 3.63 390.81443 13.77 404.70479 16.79 484.79048 76.876 390.814 13.769 13MB054b-280 522.87 69124.07 1.632 18.671153 2.02 0.4616898 3.59 0.0625202 2.97 390.93382 11.27 385.4325 11.52 352.51139 45.571 390.934 11.274 13MB054b-109 294.61 94240.38 0.93 17.761156 3.1 0.4900137 3.74 0.0631216 2.09 394.58184 7.987 404.91984 12.48 464.32439 68.689 394.582 7.9865 13MB054b-215 876.06 87395.75 3.128 16.774211 1.38 0.520381 2.54 0.0633085 2.13 395.71514 8.166 425.40589 8.811 589.6618 29.902 395.715 8.1662 13MB054b-26 238.7 29957.87 1.369 17.855724 3.02 0.5046473 4.48 0.0653528 3.3 408.09669 13.05 414.84337 15.24 452.52332 67.124 408.097 13.049 13MB054b-323 947.47 69066.31 3.17 17.354047 2.29 0.5253096 4.29 0.0661173 3.62 412.72082 14.49 428.69208 14.99 515.45308 50.261 412.721 14.492 13MB054b-162 689.77 113020.3 1.996 17.851674 1.87 0.527954 4.38 0.0683556 3.96 426.24077 16.34 430.45094 15.37 453.02785 41.493 426.241 16.344 13MB054b-282 325.2 152005.7 2.982 17.966935 2.55 0.5257426 3.33 0.0685087 2.14 427.16492 8.847 428.98028 11.66 438.72168 56.836 427.165 8.8471 13MB054b-7 157.55 48202.15 1.697 17.635907 2.46 0.5713478 5.63 0.0730798 5.07 454.68357 22.25 458.88583 20.8 479.96001 54.301 454.684 22.253 13MB054b-51 452.43 77432.09 4.331 17.05335 3.09 0.6023152 4.14 0.0744959 2.76 463.18522 12.31 478.70195 15.79 553.74035 67.361 463.185 12.314 13MB054b-229 260.17 39928.78 0.874 17.235839 2.77 0.644713 4.7 0.080593 3.79 499.66161 18.23 505.21998 18.7 530.48728 60.79 499.662 18.227 13MB054b-95 608.42 139434.9 10.57 16.332236 1.9 0.7922133 3.07 0.0938397 2.41 578.2056 13.35 592.42658 13.79 647.29406 40.779 578.206 13.353 13MB054b-327 228.68 52634.32 1.368 15.443158 2.61 0.9561075 4.75 0.1070882 3.97 655.81509 24.77 681.27789 23.6 766.32068 55.057 655.815 24.772

156 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB054b-115 166.78 6838668 2.605 15.355576 2.41 1.0608762 3.46 0.1181489 2.48 719.90018 16.89 734.25519 18.1 778.28934 50.771 719.9 16.893 13MB054b-224 108.11 49253.83 0.675 15.796362 2.86 1.0410924 4.12 0.1192738 2.96 726.38253 20.31 724.46074 21.32 718.49693 60.812 726.383 20.308 13MB054b-148 222.82 79795.67 1.216 15.854371 2.48 1.0569157 3.81 0.1215313 2.89 739.37126 20.18 732.30199 19.88 710.71993 52.759 739.371 20.182 13MB054b-94 198.75 65726.81 0.724 15.172812 1.95 1.1111365 2.64 0.1222735 1.77 743.6358 12.42 758.72104 14.08 803.41467 40.937 743.636 12.416 13MB054b-17 177.58 42215.68 0.673 15.616565 1.8 1.1043494 3.34 0.1250808 2.81 759.74135 20.13 755.45145 17.78 742.75209 38.079 759.741 20.133 13MB054b-136 188.76 46333.87 1.172 15.254334 2.47 1.136958 3.96 0.1257872 3.1 763.78735 22.3 771.06496 21.4 792.18366 51.852 763.787 22.3 13MB054b-77 156.39 88120.01 1.189 15.567671 2.73 1.1150231 4 0.1258944 2.92 764.40098 21.07 760.58867 21.43 749.38061 57.743 764.401 21.066 13MB054b-62 1175.9 173709.6 4.556 15.096845 1.67 1.1559245 3.05 0.1265652 2.56 768.24094 18.53 780.03718 16.63 813.95754 34.858 768.241 18.529 13MB054b-228 147.26 31220.58 1.177 15.253667 2.44 1.1591789 3.37 0.12824 2.31 777.81717 16.95 781.5688 18.35 792.27534 51.288 777.817 16.954 13MB054b-46 139.93 28568.84 1.402 15.167676 1.88 1.1687458 3.15 0.1285695 2.52 779.69943 18.52 786.05782 17.23 804.12357 39.458 779.699 18.52 13MB054b-9 274.61 62505.73 2.458 15.203967 2.17 1.1713341 3.84 0.1291625 3.17 783.08591 23.39 787.26888 21.04 799.1178 45.392 783.086 23.386 13MB054b-285 673.68 67386.62 0.754 14.808862 1.43 1.2045516 5.24 0.1293736 5.04 784.29127 37.23 802.68482 29.09 854.05395 29.804 784.291 37.229 13MB054b-35 676.84 239579.1 13.81 15.023832 2.02 1.2094612 3.43 0.1317866 2.77 798.04985 20.79 804.94359 19.05 824.08536 42.158 798.05 20.789 13MB054b-292 955.92 278640.1 2.204 14.999317 1.67 1.2155067 4.27 0.1322293 3.93 800.57042 29.58 807.71806 23.79 827.45189 34.884 800.57 29.581 13MB054b-47 175.4 90702.89 1.613 15.238292 1.69 1.2293821 2.93 0.1358695 2.4 821.26298 18.5 814.05744 16.42 794.39051 35.367 821.263 18.5 13MB054b-326 89.93 27366.79 1.956 15.012702 2.16 1.2582139 5.31 0.1369973 4.85 827.66064 37.7 827.10483 30.06 825.59242 45.1 827.661 37.695 13MB054b-235 253.04 121988.3 1.95 14.79757 1.81 1.3617134 2.86 0.1461419 2.21 879.30034 18.17 872.60739 16.74 855.67264 37.645 879.3 18.166 13MB054b-209 398.96 178237.7 8.612 14.468967 1.32 1.4877574 3.13 0.1561235 2.84 935.19828 24.71 925.40151 19.01 902.10783 27.212 902.108 27.212 13MB054b-107 252.3 91704.93 0.443 14.454589 2.1 1.4257434 3.47 0.1494672 2.76 897.97592 23.12 899.76956 20.71 904.15743 43.387 904.157 43.387 13MB054b-137 384.9 773717.3 2.182 14.25556 1.82 1.4758782 3 0.1525926 2.39 915.48009 20.42 920.54135 18.18 932.68713 37.295 932.687 37.295 13MB054b-60 182.12 148001 2.441 13.941748 1.86 1.579262 3.06 0.1596872 2.43 955.03836 21.6 962.07879 19.02 978.19616 37.789 978.196 37.789 13MB054b-291 341.07 105875.6 16.99 13.599417 1.5 1.4579039 3.33 0.1437964 2.98 866.0943 24.13 913.14304 20.09 1028.6483 30.401 1028.65 30.401 13MB054b-286 465.67 170585.1 1.804 13.012891 1.83 1.9357752 3.04 0.1826953 2.42 1081.6825 24.14 1093.5386 20.35 1117.2377 36.555 1117.24 36.555 13MB054b-104 586.38 841071 1.453 12.829937 1.33 1.9859668 3.27 0.1847971 2.99 1093.1286 30.09 1110.7515 22.11 1145.4327 26.355 1145.43 26.355 13MB054b-166 270.48 99788.44 3.72 12.73867 1.96 2.1091923 2.93 0.1948673 2.18 1147.6883 22.9 1151.8129 20.18 1159.5668 38.861 1159.57 38.861 13MB054b-18 255.41 57298.66 1.65 12.383382 1.99 2.3862498 4.55 0.2143157 4.09 1251.7691 46.51 1238.4861 32.55 1215.4685 39.141 1215.47 39.141 13MB054b-15 290.21 94467.75 3.43 12.362296 2.34 2.1906546 3.36 0.1964137 2.42 1156.0257 25.57 1178.0739 23.45 1218.7824 45.971 1218.78 45.971 13MB054b-132 392.82 387163.8 4.009 11.440965 1.52 2.9248854 3.04 0.2427003 2.64 1400.7197 33.23 1388.371 23.04 1369.427 29.197 1369.43 29.197 13MB054b-56 569.6 151761.5 2.117 10.859253 1.19 3.1691995 2.33 0.2496021 2 1436.4235 25.79 1449.6868 17.98 1469.1705 22.552 1469.17 22.552 13MB054b-78 123.85 70337.53 1.509 10.44807 2.21 3.2458199 3.26 0.245957 2.39 1417.5918 30.46 1468.1778 25.29 1542.0972 41.549 1542.1 41.549 13MB054b-240 76.818 39388.66 1.112 9.7567896 2.04 4.1340149 3.65 0.2925349 3.03 1654.1843 44.25 1661.0529 29.88 1669.7299 37.67 1669.73 37.67 13MB054b-90 104.68 81140.81 2.668 9.4125094 2.21 4.3328961 3.6 0.2957893 2.84 1670.3948 41.72 1699.6441 29.67 1735.886 40.561 1735.89 40.561 13MB054b-141 110.15 59428.33 1.168 9.4036849 1.86 4.6003249 2.86 0.3137511 2.17 1759.1394 33.43 1749.3269 23.83 1737.6061 34.029 1737.61 34.029 13MB054b-14 172.54 210834.1 1.625 9.3944726 1.8 4.3644106 3.68 0.2973697 3.21 1678.2525 47.38 1705.6268 30.38 1739.403 32.988 1739.4 32.988 13MB054b-321 80.662 40457.13 2.526 9.3561389 2.13 4.4818475 3.96 0.3041252 3.34 1711.7325 50.26 1727.6156 32.91 1746.8916 38.962 1746.89 38.962 13MB054b-74 711.75 61546.3 53.07 9.335846 1.81 3.1905174 3 0.2160297 2.39 1260.8621 27.39 1454.8654 23.19 1750.8674 33.116 1750.87 33.116 13MB054b-114 71.203 77460.74 1.033 9.0519135 1.75 4.7563928 3.09 0.3122603 2.54 1751.8202 39.01 1777.2361 25.93 1807.205 31.898 1807.21 31.898 13MB054b-193 146.3 49467.26 2.071 9.0275284 1.91 4.7449869 5.11 0.3106723 4.74 1744.0145 72.46 1775.2222 42.89 1812.1074 34.686 1812.11 34.686 13MB054b-296 87.467 134092.8 1.237 9.017594 2.42 4.8444905 5.36 0.3168382 4.79 1774.2694 74.23 1792.6582 45.17 1814.1075 43.968 1814.11 43.968 13MB054b-168 291.57 280411.5 2.762 8.9843129 2.12 5.0884683 3.16 0.3315665 2.34 1845.9699 37.52 1834.1844 26.78 1820.8171 38.46 1820.82 38.46 13MB054b-180 546.66 264367.7 11.03 8.9686217 1.53 3.9825046 3.51 0.2590483 3.16 1484.9709 41.89 1630.6368 28.49 1823.989 27.73 1823.99 27.73 13MB054b-314 687.02 149542.5 4.595 8.9580003 1.5 4.9742142 3.08 0.3231724 2.69 1805.2035 42.28 1814.9491 26.02 1826.1385 27.265 1826.14 27.265 13MB054b-210 204.11 189384.6 3.24 8.9521842 1.43 4.8948593 3.33 0.3178103 3.01 1779.0265 46.74 1801.3714 28.06 1827.3163 25.863 1827.32 25.863 13MB054b-304 353.14 76138.82 3.123 8.9465481 2.21 5.1315248 3.48 0.3329666 2.68 1852.7444 43.23 1841.3398 29.55 1828.4583 40.027 1828.46 40.027 13MB054b-310 253.02 77241.75 3.105 8.9422243 1.4 4.606053 2.78 0.2987261 2.4 1684.9888 35.56 1750.3649 23.19 1829.3348 25.455 1829.33 25.455 13MB054b-112 346.11 90482.52 2.007 8.928082 2.06 5.246903 3.16 0.3397504 2.39 1885.4685 39.11 1860.2689 26.96 1832.2038 37.416 1832.2 37.416 13MB054b-266 169.19 69067.58 1.961 8.9085558 1.93 5.1546052 3.11 0.3330439 2.44 1853.1181 39.25 1845.1547 26.45 1836.1709 34.981 1836.17 34.981 13MB054b-34 352.55 72616.13 1.449 8.8989041 1.46 5.0871585 2.51 0.32833 2.04 1830.282 32.53 1833.966 21.32 1838.1344 26.494 1838.13 26.494 13MB054b-260 471.68 86175.83 1.98 8.8932454 1.48 5.1753052 3.77 0.3338066 3.47 1856.8057 55.98 1848.564 32.13 1839.2863 26.886 1839.29 26.886 13MB054b-147 403.05 87676.62 2.118 8.8852593 1.62 5.2425156 3.94 0.3378381 3.59 1876.2605 58.38 1859.5555 33.57 1840.9129 29.324 1840.91 29.324 13MB054b-171 578.15 51138.7 5.137 8.8755346 1.68 4.7240084 2.6 0.3040912 1.99 1711.5644 29.85 1771.5077 21.78 1842.8952 30.328 1842.9 30.328 13MB054b-289 159.63 56290.36 2.064 8.8612047 1.76 5.2154584 3.25 0.3351845 2.73 1863.4618 44.11 1855.1449 27.67 1845.8194 31.929 1845.82 31.929 13MB054b-126 356.55 175359.4 1.62 8.851246 1.82 4.9936464 4.38 0.3205686 3.98 1792.5052 62.28 1818.2464 37.05 1847.8537 32.974 1847.85 32.974 13MB054b-143 376.05 691061 1.776 8.850967 1.78 5.3216097 3.63 0.3416115 3.16 1894.4174 51.9 1872.3398 31.02 1847.9108 32.21 1847.91 32.21 13MB054b-205 691.05 191419.5 7.258 8.826449 2.09 4.5836103 5.65 0.2934218 5.25 1658.6062 76.78 1746.2919 47.13 1852.927 37.76 1852.93 37.76 13MB054b-32 413.97 172673.9 1.231 8.8253341 1.94 5.0328309 4.88 0.3221382 4.48 1800.1629 70.37 1824.863 41.39 1853.1553 35.156 1853.16 35.156 13MB054b-167 376.02 58794.32 1.958 8.8252394 1.45 5.3637064 3.31 0.343313 2.97 1902.5878 48.96 1879.079 28.3 1853.1747 26.192 1853.17 26.192 13MB054b-101 103.86 181423.5 1.031 8.8224536 1.63 4.9665402 3.49 0.3177913 3.09 1778.9338 48.02 1813.6439 29.53 1853.7454 29.46 1853.75 29.46 13MB054b-105 375.87 362619.1 2.881 8.8146693 1.88 4.92708 4.48 0.3149883 4.07 1765.207 62.85 1806.9063 37.86 1855.3371 33.951 1855.34 33.951 13MB054b-307 161.88 60634.79 0.847 8.8129267 1.9 5.0180856 4.34 0.3207428 3.91 1793.3558 61.21 1822.3782 36.8 1855.6944 34.252 1855.69 34.252 13MB054b-57 1610.8 333332.1 1.873 8.81029 1.78 5.1652539 3.18 0.3300507 2.63 1838.6271 42.14 1846.91 27.03 1856.2352 32.101 1856.24 32.101 13MB054b-43 587.92 61459.81 24.59 8.7965355 1.38 4.4944803 3.51 0.2867411 3.23 1625.2229 46.35 1729.9528 29.16 1859.0581 24.987 1859.06 24.987 13MB054b-84 485.35 142567.8 1.6 8.7932304 1.7 4.8656081 3.36 0.3103018 2.9 1742.1918 44.24 1796.3204 28.29 1859.7369 30.636 1859.74 30.636 13MB054b-158 370.65 1334263 2.985 8.7878873 2.05 5.0784445 2.99 0.3236785 2.18 1807.6689 34.42 1832.5114 25.39 1860.8348 36.953 1860.83 36.953 13MB054b-206 558.86 119151.5 12.27 8.784864 1.95 5.134328 3.44 0.3271277 2.83 1824.4449 44.99 1841.8039 29.22 1861.4562 35.178 1861.46 35.178 13MB054b-10 333.52 82413.37 2.962 8.7812039 1.5 5.3752552 5.82 0.3423355 5.62 1897.8951 92.43 1880.9201 49.86 1862.2088 27.135 1862.21 27.135 13MB054b-125 306.23 179310 1.651 8.778059 1.81 4.7512903 6.3 0.3024884 6.03 1703.6366 90.3 1776.3357 52.87 1862.8556 32.686 1862.86 32.686 13MB054b-272 1428.1 861630.6 33 8.7739808 1.78 4.5606593 2.88 0.2902171 2.26 1642.6141 32.74 1742.1096 23.95 1863.6946 32.148 1863.69 32.148 13MB054b-151 1317.5 209659.7 43.64 8.7690254 1.31 5.3264494 2.71 0.3387567 2.37 1880.6854 38.67 1873.1169 23.14 1864.7146 23.569 1864.71 23.569 13MB054b-135 226.38 59242.74 7.731 8.7680001 1.95 5.4232435 2.93 0.3448724 2.19 1910.0667 36.18 1888.5345 25.14 1864.9256 35.201 1864.93 35.201 13MB054b-20 148.36 216072.6 1.253 8.7585138 1.99 4.9792909 5.02 0.3162981 4.61 1771.6252 71.45 1815.8115 42.5 1866.8796 35.928 1866.88 35.928 13MB054b-324 362.29 223672.8 4.118 8.7488021 1.34 5.3518342 2.62 0.3395862 2.25 1884.6783 36.77 1877.1829 22.43 1868.8816 24.262 1868.88 24.262 13MB054b-54 475.32 152069.2 2.186 8.7478787 1.9 5.0262999 2.89 0.3188966 2.18 1784.3382 34.01 1823.7632 24.5 1869.0721 34.259 1869.07 34.259 13MB054b-248 745 316920 5.035 8.7476058 1.54 5.3079645 3.12 0.3367565 2.72 1871.0468 44.14 1870.1457 26.7 1869.1283 27.788 1869.13 27.788 13MB054b-188 371.46 284637.5 8.415 8.7458236 1.99 5.466155 8.41 0.346722 8.17 1918.9265 135.6 1895.2954 72.28 1869.496 35.968 1869.5 35.968 13MB054b-66 453.38 68372.91 6.336 8.7456087 1.59 5.3155441 3.11 0.3371603 2.68 1872.9942 43.53 1871.3651 26.62 1869.5403 28.656 1869.54 28.656 13MB054b-108 323.63 79208.66 3.302 8.7327956 1.62 5.0982329 3.16 0.3229027 2.71 1803.8894 42.72 1835.8116 26.84 1872.1851 29.213 1872.19 29.213

157 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB054b-76 350.34 52171.26 4.3 8.7319327 1.87 5.4058873 3.11 0.3423545 2.48 1897.9867 40.77 1885.7871 26.63 1872.3633 33.745 1872.36 33.745 13MB054b-55 343.17 106752.6 1.862 8.7291379 2.01 5.2979702 3.73 0.3354128 3.14 1864.5636 50.81 1868.5357 31.86 1872.9407 36.308 1872.94 36.308 13MB054b-28 917.07 213480 3.24 8.724753 1.66 4.8397399 2.96 0.3062484 2.45 1722.2191 37.04 1791.8325 24.9 1873.8468 29.877 1873.85 29.877 13MB054b-153 99.414 75923.53 1.145 8.7080179 3.51 4.8685313 16.1 0.3074794 15.7 1728.2911 238.5 1796.8263 136.6 1877.3082 63.357 1877.31 63.357 13MB054b-225 254.11 123866.8 1.642 8.7047443 1.6 5.2230732 2.6 0.329747 2.05 1837.1552 32.72 1856.3882 22.17 1877.9859 28.924 1877.99 28.924 13MB054b-122 259.69 176150.8 1.255 8.6872532 1.44 5.3431248 5.97 0.3366484 5.8 1870.5255 94.11 1875.7897 51.13 1881.6104 25.965 1881.61 25.965 13MB054b-69 218.79 155828.3 1.437 8.6629194 1.92 4.947628 3.32 0.3108566 2.71 1744.9205 41.42 1810.4204 28.04 1886.6622 34.508 1886.66 34.508 13MB054b-138 483.6 89149.33 3.342 8.6500071 1.61 5.3204715 2.83 0.3337838 2.33 1856.6956 37.51 1872.157 24.16 1889.3474 28.894 1889.35 28.894 13MB054b-288 529.67 54730.38 4.984 8.6467991 1.47 4.8057223 3.2 0.3013788 2.84 1698.1425 42.44 1785.9004 26.89 1890.015 26.395 1890.02 26.395 13MB054b-202 270.61 756813.1 3.241 8.6340745 2.38 5.1034039 3.83 0.3195762 2.99 1787.6592 46.76 1836.6722 32.51 1892.6612 42.882 1892.66 42.882 13MB054b-36 362.14 56769.91 5.696 8.6257786 1.6 5.3996353 3.4 0.3378014 3 1876.084 48.76 1884.7957 29.11 1894.3906 28.821 1894.39 28.821 13MB054b-27 168.87 233758.4 1.718 8.6152728 2.14 5.5979076 4.08 0.3497788 3.47 1933.5422 57.94 1915.7766 35.14 1896.5825 38.535 1896.58 38.535 13MB054b-262 162.55 102960.5 1.631 8.6078014 2.04 4.99186 4.41 0.3116401 3.91 1748.7726 59.95 1817.9437 37.34 1898.1427 36.606 1898.14 36.606 13MB054b-207 46.25 177593.4 0.747 8.5890011 2.46 4.3995751 5.39 0.2740641 4.8 1561.3979 66.59 1712.261 44.66 1902.0731 44.191 1902.07 44.191 13MB054b-195 571.03 382814.1 2.297 8.5811407 1.74 5.2673225 2.71 0.3278186 2.07 1827.8 32.92 1863.5825 23.1 1903.7184 31.343 1903.72 31.343 13MB054b-181 1033.3 238466.4 11.13 8.5771507 2.05 5.4047223 5.33 0.3362135 4.92 1868.4278 79.83 1885.6024 45.71 1904.554 36.825 1904.55 36.825 13MB054b-86 935.83 146961.5 2.242 8.5769042 1.61 5.1948321 4.35 0.3231475 4.04 1805.0821 63.65 1851.7697 37.07 1904.6056 28.895 1904.61 28.895 13MB054b-21 1110.8 150605.1 138 8.5722057 1.42 5.609467 5.24 0.3487489 5.04 1928.6218 84 1917.554 45.15 1905.5901 25.542 1905.59 25.542 13MB054b-317 435.46 169609.2 3.1 8.5686886 1.22 5.0558278 2.17 0.3141994 1.79 1761.3387 27.54 1828.7263 18.36 1906.3272 21.965 1906.33 21.965 13MB054b-257 141.75 317329.9 0.93 8.5405177 1.37 5.571088 5.15 0.3450825 4.97 1911.074 82.17 1911.6408 44.4 1912.2403 24.676 1912.24 24.676 13MB054b-83 941.46 689120.6 15.34 8.475851 1.83 4.5496402 3.06 0.2796785 2.45 1589.743 34.55 1740.0955 25.48 1925.8722 32.834 1925.87 32.834 13MB054b-93 813.64 147993.6 2.497 8.438845 2.1 4.9795927 4.75 0.3047723 4.26 1714.9304 64.1 1815.8628 40.17 1933.7061 37.634 1933.71 37.634 13MB054b-145 681.3 512349.6 8.967 8.3889756 1.98 5.228708 3.28 0.3181281 2.61 1780.581 40.53 1857.3071 27.92 1944.3114 35.495 1944.31 35.495 13MB054b-322 492.84 154791.7 2.933 8.2953505 1.68 4.6485647 6.52 0.2796742 6.3 1589.7211 88.77 1758.0357 54.54 1964.3529 30.019 1964.35 30.019 13MB054b-265 270.94 173659.9 2.188 8.0800395 0.98 6.1476639 2.52 0.3602652 2.32 1983.4307 39.64 1997.0407 22.02 2011.1369 17.405 2011.14 17.405 13MB054b-216 405.55 175042.9 2.157 7.9480144 1.66 6.3334223 2.36 0.3650865 1.68 2006.239 28.92 2023.0921 20.67 2040.3145 29.275 2040.31 29.275 13MB054b-241 957.22 67856.57 11.27 7.9425245 1.71 5.9956537 4.74 0.3453773 4.42 1912.4868 73.2 1975.2135 41.29 2041.5363 30.245 2041.54 30.245 13MB054b-119 160.01 26922.95 2.463 7.7677721 2.49 6.1300187 4.7 0.345348 3.99 1912.3465 65.96 1994.531 41.03 2080.7805 43.765 2080.78 43.765 13MB054b-270 226.68 135438.7 8.876 7.424888 3.8 5.934024 4.63 0.3195493 2.65 1787.5279 41.31 1966.2287 40.22 2159.8862 66.236 2159.89 66.236 13MB054b-1 362.34 65364.06 1.563 7.3819417 1.96 7.0596521 3.7 0.3779659 3.14 2066.7748 55.47 2118.9728 32.92 2170.0015 34.18 2170 34.18 13MB054b-149 448.06 715181.6 10.78 7.3000634 1.45 7.46164 3.35 0.3950569 3.02 2146.2382 55.21 2168.3942 30.05 2189.4144 25.264 2189.41 25.264 13MB054b-67 132.67 93423.78 1.504 7.2921394 1.88 7.0071358 2.73 0.3705905 1.98 2032.1781 34.58 2112.335 24.27 2191.303 32.644 2191.3 32.644 13MB054b-50 650.29 5215484 3.119 7.1076572 1.34 7.0616768 2.55 0.3640265 2.18 2001.2313 37.43 2119.2279 22.72 2235.7436 23.139 2235.74 23.139 13MB054b-30 253.58 188094.5 1.685 6.7994595 1.65 8.6283982 3.32 0.4255037 2.88 2285.4163 55.39 2299.5551 30.2 2312.1246 28.301 2312.12 28.301 13MB054b-73 298.79 59778.29 3.429 6.5537874 1.71 8.7078533 3.56 0.4139064 3.13 2232.7568 58.98 2307.8999 32.45 2375.07 29.114 2375.07 29.114 13MB054b-68 248.18 112095.5 1.65 6.4651267 1.67 8.5864084 2.89 0.4026125 2.36 2181.0579 43.64 2295.1173 26.29 2398.2602 28.42 2398.26 28.42 13MB054b-274 135.68 81907.4 1.91 6.3990133 2.37 9.6643846 3.85 0.4485243 3.03 2388.6884 60.42 2403.3199 35.4 2415.7281 40.294 2415.73 40.294 13MB054b-287 275.23 106371.8 2.337 6.3603747 1.39 9.3339085 2.83 0.4305712 2.46 2308.292 47.74 2371.3566 25.93 2426.0004 23.586 2426 23.586 13MB054b-110 86.484 73418.36 1.498 6.2815792 1.65 9.740071 2.86 0.4437411 2.34 2367.3667 46.31 2410.5008 26.34 2447.1216 27.903 2447.12 27.903 13MB054b-186 50.003 61757.55 0.657 6.2651985 1.98 10.494712 3.44 0.4768745 2.82 2513.6375 58.61 2479.4508 31.91 2451.5399 33.454 2451.54 33.454 13MB054b-283 134.45 56016.45 0.971 6.2493619 1.79 9.8926449 5.94 0.4483806 5.66 2388.049 113.1 2424.8239 54.83 2455.8206 30.259 2455.82 30.259 13MB054b-163 282.24 702738.7 2.606 6.2418013 1.66 9.0276601 3.55 0.4086804 3.14 2208.8858 58.78 2340.8106 32.5 2457.8674 28.061 2457.87 28.061 13MB054b-276 243.1 56665.42 1.108 6.220334 1.12 10.158332 3.61 0.4582841 3.43 2431.9774 69.52 2449.2933 33.38 2463.6902 18.949 2463.69 18.949 13MB054b-275 165.45 235778.9 0.957 6.216142 1.99 9.6773863 3.86 0.4362925 3.31 2334.0218 64.89 2404.5571 35.58 2464.8292 33.604 2464.83 33.604 13MB054b-277 714.55 104507 1.034 6.1832002 1.31 10.373553 2.69 0.4651999 2.34 2462.4764 47.96 2468.6914 24.87 2473.7965 22.136 2473.8 22.136 13MB054b-154 180.86 77864.84 1.601 6.1658601 2.08 8.6070204 3.91 0.3848976 3.31 2099.1215 59.29 2297.2982 35.58 2478.5358 35.128 2478.54 35.128 13MB054b-330 160.8 361062.6 1.641 6.1553716 1.69 10.25023 3.37 0.4576006 2.92 2428.9552 59 2457.6215 31.17 2481.4078 28.451 2481.41 28.451 13MB054b-29 61.614 80289.72 1.229 6.0893735 1.68 10.115147 3.04 0.4467284 2.53 2380.6912 50.39 2445.3559 28.1 2499.5732 28.345 2499.57 28.345 13MB054b-102 89.003 150695.6 1.886 6.0881754 1.42 10.76719 3.06 0.4754318 2.71 2507.3375 56.36 2503.2393 28.48 2499.9045 23.97 2499.9 23.97 13MB054b-220 796.65 339171.6 7.418 6.0833812 1.26 9.5136232 4.75 0.419749 4.58 2259.34 87.36 2388.8631 43.71 2501.2306 21.267 2501.23 21.267 13MB054b-59 213.83 290399.1 0.794 6.053278 1.68 10.470836 3.28 0.459696 2.82 2438.2156 57.22 2477.3395 30.44 2509.5716 28.303 2509.57 28.303 13MB054b-238 410.01 83055.88 1.233 6.0499513 1.52 10.640858 2.76 0.4669036 2.31 2469.9682 47.44 2492.2792 25.67 2510.4962 25.505 2510.5 25.505 13MB054b-252 323.24 192357.3 1.511 6.0462348 1.49 10.767736 6.15 0.4721806 5.97 2493.1164 123.4 2503.2863 57.22 2511.5296 25.106 2511.53 25.106 13MB054b-40 200.26 85544.01 1.779 6.0435435 1.8 10.839279 2.74 0.4751063 2.07 2505.9149 42.98 2509.4408 25.51 2512.2782 30.267 2512.28 30.267 13MB054b-89 67.416 58566.21 1.463 6.0338613 2.09 10.657497 3.63 0.4663901 2.97 2467.7108 60.82 2493.7295 33.7 2514.9739 35.155 2514.97 35.155 13MB054b-233 273.21 151797 2.583 6.0024422 3.15 6.2467693 7.26 0.2719457 6.54 1550.6706 90.2 2011.0228 63.65 2523.7464 52.929 2523.75 52.929 13MB054b-152 201.59 166545.6 2.168 5.9969784 1.51 10.913169 2.99 0.4746594 2.58 2503.9616 53.51 2515.7582 27.81 2525.2759 25.374 2525.28 25.374 13MB054b-23 105.83 69064.1 2.961 5.9664022 2.01 11.569244 3.15 0.5006293 2.43 2616.4999 52.21 2570.1913 29.43 2533.8563 33.64 2533.86 33.64 13MB054b-123 111.18 179725.4 1.042 5.8688711 1.43 12.144498 2.8 0.5169314 2.41 2686.1528 53.01 2615.6301 26.32 2561.4672 23.909 2561.47 23.909 13MB054b-258 564.7 424475 3.136 5.806212 1.43 11.714973 4.27 0.4933247 4.02 2585.0444 85.66 2581.896 39.95 2579.4132 23.875 2579.41 23.875 13MB054b-53 305.37 622049.2 1.337 5.741811 1.56 11.686239 2.7 0.4866563 2.2 2556.1935 46.48 2579.5988 25.25 2598.0213 26.006 2598.02 26.006 13MB054b-65 376.45 787476.6 2.071 5.7400361 1.25 11.091499 2.91 0.4617465 2.63 2447.2646 53.57 2530.8449 27.13 2598.5369 20.797 2598.54 20.797 13MB054b-316 292.78 179413.2 7.548 5.6667342 1.4 11.281831 5.57 0.4636723 5.39 2455.7523 110.2 2546.7036 52.03 2619.9445 23.272 2619.94 23.272 13MB054b-230 131.79 97159.89 4.084 5.4712336 1.61 12.467087 3.46 0.4947081 3.06 2591.0131 65.25 2640.2485 32.49 2678.1936 26.619 2678.19 26.619 13MB054b-308 162.56 245416.1 1.633 5.1782415 1.92 13.536458 3.66 0.5083772 3.11 2649.6978 67.59 2717.8351 34.59 2768.8688 31.537 2768.87 31.537 13MB054b-329 46.995 30284.7 1.654 4.0071093 1.92 22.045348 3.44 0.6406884 2.85 3191.7223 71.78 3185.7277 33.38 3181.9443 30.356 3181.94 30.356 13MB056a 13MB056a-149 1660.6 74682.55 2.692 21.049148 2.13 0.045016 3.68 0.0068723 3 44.149918 1.319 44.709505 1.609 74.843312 50.61 44.1499 1.3194 13MB056a-148 1842.9 29595.62 5.992 21.900212 2.5 0.0447055 4.64 0.0071008 3.9 45.613003 1.774 44.40779 2.015 20.192881 60.591 45.613 1.7739 13MB056a-46 2115.2 10421.66 3.411 22.352197 3.21 0.0443874 4.25 0.0071958 2.78 46.220949 1.28 44.098576 1.834 69.858791 78.53 46.2209 1.2802 13MB056a-100 2039.8 15346.03 2.123 10.425024 2.19 0.422048 3.53 0.0319108 2.77 202.49624 5.514 357.51446 10.62 1546.2481 41.064 202.496 5.5144 13MB056a-4 757.94 32262.48 1.709 19.161871 2.69 0.2302581 3.85 0.0320001 2.75 203.0542 5.503 210.41174 7.318 293.61132 61.506 203.054 5.5028 13MB056a-136 1346.4 83638.06 2.362 15.849405 8.85 0.2787026 10.1 0.0320371 4.82 203.285 9.65 249.62785 22.3 711.41231 188.34 203.285 9.6505 13MB056a-173 415.83 34935.68 2.156 19.314197 2.06 0.2304685 4.53 0.032284 4.03 204.82703 8.132 210.58535 8.612 275.48107 47.157 204.827 8.1317 13MB056a-250 637.76 69576.57 3.377 19.452925 2.04 0.231643 3.96 0.0326816 3.39 207.30941 6.913 211.55406 7.556 259.08187 46.97 207.309 6.9128 13MB056a-318 222.74 20819.35 1.895 19.67339 2.84 0.2291089 3.93 0.0326904 2.71 207.36449 5.539 209.46284 7.433 233.15475 65.514 207.364 5.5394 13MB056a-17 498.14 15763.52 3.549 19.867037 2.63 0.2271425 5.25 0.0327288 4.54 207.60439 9.28 207.83704 9.862 210.48216 60.88 207.604 9.2801

158 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB056a-196 291.76 32589.37 2.704 19.880586 3.33 0.2269897 4.71 0.0327291 3.33 207.60622 6.8 207.71062 8.846 208.89999 77.272 207.606 6.8002 13MB056a-25 513.45 20080.37 2.088 20.355509 2.65 0.222253 4.03 0.0328117 3.04 208.12155 6.218 203.78317 7.435 153.8636 61.971 208.122 6.2175 13MB056a-180 538.17 45864.81 3.725 19.84419 2.69 0.2282622 4.32 0.0328523 3.37 208.3753 6.918 208.76307 8.145 213.12043 62.37 208.375 6.9182 13MB056a-187 998.71 43192 3.031 19.756298 1.84 0.2295658 3.39 0.0328936 2.84 208.63297 5.837 209.84017 6.418 223.41037 42.493 208.633 5.837 13MB056a-113 176.48 33990.09 2.493 20.152725 3.41 0.2250571 4.76 0.0328946 3.32 208.63948 6.809 206.11003 8.87 177.25904 79.478 208.639 6.8091 13MB056a-144 710.38 33937.24 2.444 19.654357 2.29 0.2313519 3.62 0.0329785 2.8 209.16268 5.76 211.3141 6.902 235.3881 52.911 209.163 5.7603 13MB056a-11 1787.9 37323.19 1.24 11.723466 3.28 0.3879883 4.34 0.0329893 2.85 209.23034 5.874 332.89888 12.33 1322.3269 63.494 209.23 5.874 13MB056a-242 737.19 91818.74 2.244 20.03581 1.83 0.227158 3.01 0.0330091 2.4 209.35378 4.94 207.84989 5.667 190.85567 42.528 209.354 4.9397 13MB056a-287 641.62 38280.37 3.409 19.312687 1.68 0.2358663 3.06 0.0330375 2.56 209.53104 5.286 215.02989 5.937 275.65967 38.409 209.531 5.2861 13MB056a-157 582.61 30682.94 4.388 17.620321 2.8 0.2586689 4.58 0.0330565 3.62 209.64947 7.477 233.59367 9.562 481.95633 61.948 209.649 7.4771 13MB056a-311 670.14 30811.2 3.381 19.476925 2.65 0.2340152 3.92 0.033057 2.9 209.65254 5.974 213.50789 7.557 256.22888 60.859 209.653 5.9745 13MB056a-12 763.49 40540.06 1.889 19.726214 2.48 0.231506 3.68 0.0331211 2.72 210.05257 5.614 211.4411 7.018 226.93525 57.267 210.053 5.6138 13MB056a-117 514.8 55776.51 2.764 19.532701 2.16 0.2338995 4.95 0.0331353 4.45 210.14092 9.207 213.41266 9.524 249.69027 49.626 210.141 9.2067 13MB056a-123 151.91 6180.121 2.896 20.350649 3.71 0.2248136 4.39 0.0331818 2.35 210.4312 4.862 205.90818 8.182 154.42173 86.886 210.431 4.8618 13MB056a-104 926.03 46343.88 1.74 20.243677 2.73 0.226335 3.5 0.0332307 2.19 210.73666 4.538 207.16868 6.561 166.7489 63.827 210.737 4.5379 13MB056a-236 761.06 147587.1 2.966 18.681285 1.82 0.2462246 2.9 0.0333608 2.25 211.54835 4.691 223.50476 5.812 351.30446 41.106 211.548 4.6914 13MB056a-316 392.31 30546.19 2.909 19.246329 2.89 0.2392121 4.12 0.033391 2.93 211.73664 6.11 217.77503 8.072 283.58196 66.115 211.737 6.11 13MB056a-315 501.09 32628.86 1.633 20.003141 1.53 0.2304055 2.81 0.0334264 2.35 211.95743 4.909 210.53337 5.338 194.65078 35.556 211.957 4.9087 13MB056a-1 682.84 32886.31 2.623 19.804852 2.03 0.2329637 3.56 0.0334625 2.93 212.18262 6.112 212.64231 6.838 217.71463 47.053 212.183 6.1119 13MB056a-191 715.81 25827.89 3.592 19.636424 1.62 0.2351922 2.58 0.0334953 2.01 212.38724 4.19 214.47592 4.983 237.49378 37.306 212.387 4.1903 13MB056a-326 613.26 138129.5 3.006 19.482601 2.56 0.237086 4.46 0.0335005 3.65 212.41972 7.621 216.03152 8.676 255.58673 58.971 212.42 7.6206 13MB056a-261 826.7 24105.16 2.109 20.278382 1.73 0.2277921 3.3 0.033502 2.82 212.42893 5.887 208.37443 6.224 162.74506 40.365 212.429 5.8874 13MB056a-206 414.24 36545.33 5.843 19.491618 2.86 0.2372116 5.29 0.0335338 4.45 212.62716 9.315 216.13459 10.3 254.49497 65.696 212.627 9.3151 13MB056a-215 300.69 50998.82 2.926 20.112274 3.16 0.2300286 3.94 0.0335538 2.35 212.752 4.927 210.22227 7.485 181.94302 73.682 212.752 4.9274 13MB056a-303 1043.3 75578.38 2.159 18.778327 2.06 0.2464263 4.6 0.0335616 4.11 212.80069 8.605 223.6691 9.228 339.6088 46.579 212.801 8.6055 13MB056a-176 441.82 27008.7 1.864 19.201605 1.67 0.2411809 3.21 0.0335876 2.74 212.96288 5.743 219.38695 6.336 288.87233 38.233 212.963 5.7428 13MB056a-3 1013.9 52474.93 2.852 19.001076 2.22 0.2438425 4.54 0.0336036 3.96 213.06289 8.292 221.56208 9.028 312.80247 50.441 213.063 8.2925 13MB056a-18 607.1 58190.38 2.834 19.860413 2.13 0.2334199 3.31 0.0336221 2.54 213.17799 5.325 213.01792 6.363 211.2374 49.26 213.178 5.3245 13MB056a-317 368.2 16785.21 4.78 19.856634 2.96 0.2335228 4.66 0.0336305 3.6 213.23057 7.549 213.10268 8.962 211.66777 68.692 213.231 7.549 13MB056a-154 380.7 42150.19 3.685 19.773421 2.6 0.234615 4.02 0.0336462 3.06 213.32846 6.429 214.00133 7.748 221.38964 60.062 213.328 6.429 13MB056a-161 1078.2 60980.4 3.211 17.907033 1.8 0.259243 2.62 0.0336689 1.91 213.47007 4.001 234.05669 5.483 446.14986 40.085 213.47 4.0009 13MB056a-163 518.92 111781.4 4.256 20.068293 1.63 0.2315236 3.87 0.033698 3.51 213.65145 7.37 211.45562 7.382 187.04113 37.921 213.651 7.3705 13MB056a-131 442.22 94597.77 2.269 20.192587 2.11 0.2302062 3.26 0.0337138 2.48 213.74989 5.224 210.3689 6.199 172.64931 49.362 213.75 5.2244 13MB056a-158 399.07 25091.21 2.58 20.295346 3.09 0.2290972 5.47 0.0337221 4.51 213.80177 9.487 209.4531 10.35 160.83534 72.394 213.802 9.4873 13MB056a-198 839.52 83830.04 2.071 19.848498 1.67 0.234343 2.7 0.0337348 2.13 213.88092 4.471 213.77757 5.213 212.61619 38.752 213.881 4.4713 13MB056a-67 704.32 25589.2 1.939 19.205024 2.5 0.242236 3.48 0.0337406 2.42 213.9167 5.082 220.24972 6.883 288.46308 57.164 213.917 5.0819 13MB056a-75 844.36 36835.02 3.839 19.266293 2.16 0.2414724 3.41 0.0337415 2.65 213.92263 5.566 219.62544 6.74 281.21105 49.37 213.923 5.5659 13MB056a-121 163.46 12443.86 3.847 21.422207 2.42 0.2172 3.37 0.033746 2.35 213.95086 4.941 199.57669 6.105 32.913385 57.893 213.951 4.9411 13MB056a-212 1433.3 25695.79 2.778 18.36552 2.58 0.253355 3.92 0.0337467 2.95 213.95509 6.214 229.29781 8.053 389.68096 57.991 213.955 6.2136 13MB056a-31 736.77 77424.4 2.678 19.652099 2.5 0.2369559 5.02 0.0337734 4.35 214.12171 9.157 215.92468 9.757 235.65347 57.724 214.122 9.1572 13MB056a-296 875.2 41071.71 3.841 19.488344 2.02 0.2390165 3.13 0.0337833 2.4 214.18298 5.051 217.61475 6.136 254.9087 46.343 214.183 5.0507 13MB056a-89 545.02 53918.3 2.524 19.90291 1.87 0.2340519 4.09 0.0337853 3.64 214.19561 7.675 213.5381 7.883 206.27181 43.328 214.196 7.6749 13MB056a-91 1007 42943.91 1.666 15.849252 4.54 0.2939979 5.23 0.0337949 2.6 214.25583 5.481 261.70131 12.07 711.42568 96.537 214.256 5.4813 13MB056a-320 219.27 5198.003 1.748 21.561588 2.62 0.2162328 3.6 0.0338143 2.47 214.37689 5.208 198.76957 6.498 17.332541 62.895 214.377 5.2077 13MB056a-124 542.6 47588.06 3.633 19.443428 2.3 0.239824 6.08 0.0338193 5.63 214.40753 11.87 218.2763 11.94 260.2276 52.759 214.408 11.872 13MB056a-58 833.76 75441.19 2.684 19.805093 2.33 0.2354774 3.26 0.033824 2.27 214.43699 4.789 214.71031 6.303 217.68592 54.052 214.437 4.7888 13MB056a-259 257.63 9417.772 2.738 20.052806 2.35 0.2327255 3.65 0.0338468 2.8 214.57939 5.913 212.44617 7.004 188.83806 54.564 214.579 5.9131 13MB056a-150 413.9 28579.25 2.401 19.892917 1.7 0.2349113 3.43 0.0338923 2.98 214.86293 6.287 214.24493 6.618 207.46124 39.421 214.863 6.2874 13MB056a-322 323.39 239108.6 2.459 19.527161 2.78 0.2394742 3.63 0.0339154 2.33 215.00676 4.934 217.9898 7.114 250.30365 63.909 215.007 4.9335 13MB056a-249 407.05 30202.8 3.204 19.448301 2.59 0.2406187 3.81 0.0339398 2.79 215.15937 5.902 218.92698 7.502 259.60814 59.622 215.159 5.9018 13MB056a-60 329.5 35297.02 2.586 19.681872 2.37 0.2380238 3.52 0.033977 2.61 215.39125 5.522 216.80093 6.878 232.11521 54.726 215.391 5.5223 13MB056a-125 472.87 15218.45 1.547 20.400876 2.45 0.2297837 3.62 0.0339991 2.66 215.5285 5.649 210.02012 6.871 148.65692 57.486 215.529 5.6488 13MB056a-288 126.1 13791.28 2.734 18.627972 6.45 0.2518743 7.19 0.0340289 3.18 215.71468 6.737 228.09752 14.69 357.74163 145.72 215.715 6.7366 13MB056a-59 998.52 29811.86 2.629 20.005074 2.34 0.2346343 3.32 0.0340432 2.35 215.80373 4.984 214.01716 6.403 194.42524 54.505 215.804 4.9838 13MB056a-110 886.08 67848.72 1.363 19.88289 1.89 0.2360911 2.42 0.0340454 1.51 215.81717 3.21 215.21457 4.689 208.6048 43.761 215.817 3.2097 13MB056a-155 546.78 52283.34 5.527 19.874962 1.86 0.2362237 3.84 0.0340509 3.35 215.8517 7.122 215.32349 7.448 209.55217 43.26 215.852 7.1219 13MB056a-35 414.12 70407.75 1.749 19.694076 2.46 0.2384749 3.34 0.0340625 2.26 215.92433 4.798 217.17088 6.532 230.68377 56.836 215.924 4.7983 13MB056a-199 772.32 42397.49 2.18 20.074196 1.55 0.2339603 3.18 0.0340627 2.77 215.92532 5.892 213.46273 6.115 186.35707 36.008 215.925 5.8916 13MB056a-321 527.25 13132.56 2.14 20.048955 1.75 0.2343032 2.91 0.0340697 2.33 215.96909 4.95 213.7448 5.617 189.2847 40.72 215.969 4.9499 13MB056a-194 398.26 25580.69 3.204 19.059319 2.1 0.2466692 3.4 0.0340974 2.67 216.1415 5.676 223.86694 6.827 305.85338 47.895 216.142 5.676 13MB056a-68 626.69 46636.5 4.567 20.210045 2.96 0.2326702 4.12 0.0341041 2.86 216.18343 6.077 212.40054 7.89 170.63216 69.192 216.183 6.077 13MB056a-208 225.5 17230.87 2.515 19.360157 2.76 0.2429406 3.47 0.034112 2.11 216.23286 4.493 220.82551 6.892 270.0334 63.209 216.233 4.4927 13MB056a-29 441.41 45769.41 2.114 20.384903 3.31 0.230757 3.96 0.0341163 2.18 216.25962 4.638 210.82342 7.54 150.48174 77.471 216.26 4.6385 13MB056a-13 455.52 29322.44 2.097 19.337838 3.42 0.2433632 4.24 0.034132 2.52 216.35722 5.352 221.17071 8.43 272.67749 78.28 216.357 5.3515 13MB056a-312 486.99 47956.21 2.573 20.063681 2.75 0.2347123 4.15 0.0341543 3.11 216.4962 6.629 214.08131 8.016 187.57576 64.001 216.496 6.6285 13MB056a-203 831.42 128727.7 5.108 19.301729 1.73 0.2439793 5.74 0.0341545 5.47 216.49756 11.65 221.67372 11.43 277.00394 39.495 216.498 11.65 13MB056a-43 300.65 13073.42 3.838 20.737485 3.74 0.2271378 4.75 0.0341621 2.93 216.54473 6.247 207.8331 8.927 110.18235 88.227 216.545 6.2468 13MB056a-186 967.54 52599.11 3.378 19.796786 1.94 0.2379804 3.8 0.0341692 3.26 216.58912 6.948 216.76536 7.412 218.6737 44.981 216.589 6.9477 13MB056a-64 1329 41616.24 1.49 19.842066 1.41 0.2374388 2.48 0.0341694 2.03 216.59039 4.333 216.321 4.822 213.41174 32.666 216.59 4.3333 13MB056a-218 337.78 26037.84 3.049 19.939354 3.31 0.236396 5.3 0.0341861 4.13 216.69471 8.805 215.46497 10.28 202.025 76.961 216.695 8.8054 13MB056a-32 312.84 48861.79 2.682 19.731051 3.51 0.2389179 4.36 0.0341899 2.59 216.7181 5.512 217.53395 8.545 226.3713 81.256 216.718 5.5117 13MB056a-220 424.94 70225.93 2.25 19.735329 2.32 0.2389356 3.47 0.0341998 2.58 216.78012 5.494 217.54848 6.793 225.8881 53.703 216.78 5.4936 13MB056a-40 950.13 101191.8 2.759 20.297239 2.24 0.2323689 3.44 0.0342069 2.62 216.82418 5.586 212.15236 6.595 160.6173 52.316 216.824 5.5857 13MB056a-42 318.28 16807.54 3.02 16.561449 5.33 0.2849515 6.55 0.0342269 3.8 216.94905 8.104 254.57781 14.75 617.24189 115.24 216.949 8.104 13MB056a-132 914.76 40322.1 2.895 19.735766 2.03 0.2395302 3.3 0.0342857 2.61 217.31536 5.571 218.0357 6.479 225.84289 46.84 217.315 5.5706 13MB056a-223 668.92 37898.78 2.161 19.12925 2.19 0.2472575 5.41 0.0343041 4.94 217.43008 10.57 224.34599 10.88 297.47759 50.022 217.43 10.568 13MB056a-298 623.21 25162.47 1.503 20.190931 1.85 0.2343574 2.94 0.0343189 2.29 217.52249 4.893 213.78945 5.667 172.84193 43.062 217.522 4.8934

159 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB056a-164 451.74 14883.04 3.369 20.39739 1.98 0.2319857 3.23 0.034319 2.55 217.52287 5.448 211.83661 6.171 149.06815 46.474 217.523 5.4476 13MB056a-133 416.4 23476.02 2.363 19.928903 2.8 0.2374438 4.18 0.0343197 3.11 217.52704 6.648 216.32516 8.145 203.27717 64.901 217.527 6.6482 13MB056a-253 545.14 48149.5 4.096 19.807328 2.32 0.2389517 2.91 0.0343269 1.76 217.57223 3.776 217.5617 5.702 217.44984 53.618 217.572 3.7757 13MB056a-135 549.25 101159.4 3.277 20.352602 1.84 0.2325882 2.59 0.0343326 1.82 217.60748 3.896 212.33303 4.966 154.19617 43.199 217.607 3.8956 13MB056a-27 522.33 25060.56 1.453 20.155262 2.25 0.2349612 4.28 0.0343466 3.64 217.69475 7.792 214.28602 8.263 176.96591 52.387 217.695 7.7915 13MB056a-189 785.98 32456.1 2.898 19.866671 2.09 0.2384464 3.47 0.034357 2.77 217.75944 5.942 217.1475 6.788 210.50781 48.373 217.759 5.9417 13MB056a-7 421.67 23526.45 2.362 19.780148 2.96 0.2398213 4.05 0.0344046 2.76 218.05613 5.92 218.2741 7.95 220.64761 68.495 218.056 5.9203 13MB056a-185 692.24 43309.19 3.669 19.4042 2.56 0.2445612 3.48 0.0344177 2.35 218.13814 5.047 222.1486 6.943 264.83045 58.86 218.138 5.0466 13MB056a-300 385.56 41684.87 2.108 20.127042 2.86 0.2360916 4.08 0.0344635 2.91 218.42338 6.245 215.21501 7.912 180.23293 66.68 218.423 6.2455 13MB056a-277 851.22 41780.71 3.074 20.339934 2.38 0.2339067 2.97 0.0345057 1.79 218.68646 3.848 213.41862 5.725 155.70022 55.62 218.686 3.8481 13MB056a-256 172.03 22602.75 2.971 20.218422 2.98 0.235315 4.03 0.0345061 2.7 218.68873 5.814 214.57681 7.786 169.6641 69.656 218.689 5.8137 13MB056a-69 1193.3 36715.55 3.036 19.636004 1.65 0.2423121 3.98 0.0345086 3.62 218.7043 7.785 220.31199 7.876 237.53891 37.953 218.704 7.7847 13MB056a-247 1056.6 53081.54 2.958 18.570711 2.1 0.2562243 3.42 0.0345102 2.7 218.71449 5.804 231.61967 7.082 364.68666 47.341 218.714 5.8044 13MB056a-171 1353.9 127104.7 3.494 19.571506 1.99 0.2431362 2.89 0.0345122 2.09 218.7269 4.499 220.98533 5.733 245.12611 45.81 218.727 4.4992 13MB056a-130 548.62 35808.13 2.196 19.819262 1.91 0.2402322 4.45 0.0345317 4.02 218.84814 8.65 218.61056 8.754 216.03618 44.262 218.848 8.65 13MB056a-160 255.16 14502.84 1.965 20.314972 3.17 0.2343852 3.88 0.0345339 2.22 218.86185 4.788 213.81226 7.472 158.54126 74.262 218.862 4.7879 13MB056a-239 403.62 31378.16 2.195 19.645732 2.25 0.2423764 3.32 0.0345348 2.44 218.86793 5.252 220.36456 6.572 236.38521 51.852 218.868 5.2525 13MB056a-81 2321.1 236866.8 2.508 17.020953 4.03 0.2798215 4.81 0.0345433 2.62 218.9206 5.645 250.51591 10.68 557.88869 87.953 218.921 5.6451 13MB056a-57 684.7 27586.89 1.714 19.184013 2.58 0.2483239 4.58 0.0345507 3.78 218.96674 8.135 225.21376 9.244 290.95114 58.989 218.967 8.1353 13MB056a-19 412.18 29917.02 3.646 19.90042 2.54 0.2394225 3.5 0.0345562 2.41 219.00104 5.181 217.94744 6.862 206.60585 58.914 219.001 5.1806 13MB056a-235 591.2 176456.6 2.86 19.332596 2.13 0.2465034 3.22 0.034563 2.41 219.04366 5.196 223.7319 6.457 273.29966 48.719 219.044 5.1964 13MB056a-294 149.53 22813.58 1.794 20.09341 5.06 0.2374822 5.94 0.0346085 3.11 219.32726 6.711 216.3566 11.57 184.12979 117.86 219.327 6.7113 13MB056a-116 418.17 34616.19 2.248 20.273478 2.51 0.2354765 4.18 0.0346238 3.34 219.42218 7.2 214.70956 8.087 163.31122 58.813 219.422 7.1997 13MB056a-210 325.72 174743.9 2.444 19.983281 2.21 0.2389053 2.9 0.0346251 1.87 219.43048 4.043 217.52361 5.681 196.93127 51.459 219.43 4.0432 13MB056a-272 705.87 28621.13 4.104 19.788227 2.23 0.241342 3.37 0.0346369 2.53 219.50366 5.452 219.51876 6.652 219.70367 51.608 219.504 5.4518 13MB056a-2 1222 27698.31 3.065 19.647638 2.21 0.2430993 3.16 0.0346412 2.26 219.53065 4.878 220.95519 6.284 236.17696 51.118 219.531 4.8784 13MB056a-313 396.89 78392.95 2.995 19.994725 2.14 0.2389075 3.77 0.0346453 3.11 219.55604 6.703 217.52543 7.383 195.62787 49.696 219.556 6.7034 13MB056a-260 640.59 90208.17 4.695 19.89184 2.6 0.2402833 3.99 0.0346655 3.03 219.68203 6.55 218.65242 7.856 207.59308 60.254 219.682 6.5504 13MB056a-188 677.17 59892.91 1.538 19.723507 2.05 0.2425088 4.59 0.0346905 4.11 219.83776 8.875 220.47272 9.094 227.23391 47.328 219.838 8.8753 13MB056a-103 940.74 31753.89 1.703 14.852422 3.53 0.322055 4.28 0.0346917 2.42 219.84556 5.223 283.48208 10.57 847.9582 73.371 219.846 5.2232 13MB056a-45 1778 26580.01 2.773 12.451028 2.09 0.3843524 3.81 0.0347083 3.18 219.94888 6.886 330.23555 10.73 1204.7063 41.148 219.949 6.8856 13MB056a-108 295.22 26817.4 1.692 19.323517 3.54 0.2476816 6 0.0347119 4.84 219.97128 10.47 224.69115 12.09 274.37573 81.176 219.971 10.47 13MB056a-275 383.67 38145.82 2.471 20.040425 2.44 0.2388321 3.97 0.0347135 3.13 219.98114 6.768 217.46367 7.764 190.32033 56.691 219.981 6.768 13MB056a-139 221.13 27834.31 2.305 20.21097 2.53 0.2369313 3.42 0.0347303 2.3 220.08571 4.975 215.9045 6.656 170.52557 59.162 220.086 4.9755 13MB056a-271 736.73 94453.73 2.745 19.832463 1.73 0.2415191 3.39 0.0347398 2.91 220.14475 6.309 219.66359 6.692 214.53324 39.997 220.145 6.3085 13MB056a-211 584.9 25799.82 3.67 19.678644 1.83 0.2434093 3.21 0.0347401 2.64 220.14684 5.724 221.20831 6.39 232.49309 42.165 220.147 5.7241 13MB056a-166 235.73 104930 2.888 20.78389 3.25 0.2305916 3.85 0.0347591 2.08 220.2655 4.496 210.68693 7.334 104.89741 76.74 220.265 4.4963 13MB056a-50 921.88 16782.2 2.067 20.677418 2.7 0.2318897 4.14 0.0347757 3.13 220.36897 6.779 211.75746 7.905 116.98989 63.762 220.369 6.7787 13MB056a-39 575.89 42821.25 1.894 17.504201 5.85 0.2739683 6.83 0.0347809 3.52 220.40133 7.63 245.8615 14.91 496.50103 128.97 220.401 7.6298 13MB056a-281 871.51 130692.5 2.369 19.540482 1.59 0.2455674 2.64 0.034802 2.1 220.53272 4.554 222.96912 5.279 248.74748 36.715 220.533 4.5538 13MB056a-226 658.78 212044.4 2.073 19.68104 2.33 0.2439081 4.01 0.0348155 3.26 220.6168 7.068 221.61562 7.976 232.21219 53.798 220.617 7.068 13MB056a-26 276.58 8988.829 1.548 6.9959665 1.6 0.6869878 3.9 0.0348574 3.56 220.87785 7.724 530.98905 16.13 2263.1096 27.643 220.878 7.7244 13MB056a-182 213.88 22443.83 4.636 19.55841 2.44 0.2458296 3.28 0.0348712 2.19 220.96336 4.762 223.18289 6.571 246.62309 56.159 220.963 4.7616 13MB056a-21 391.55 31730.56 2.54 20.168476 4.1 0.2386402 4.55 0.0349072 1.97 221.18804 4.275 217.30637 8.894 175.43815 95.664 221.188 4.2748 13MB056a-49 335.79 43718.62 3.38 20.642667 3.77 0.2332109 4.83 0.0349151 3.02 221.23705 6.571 212.84585 9.284 120.95392 88.972 221.237 6.5712 13MB056a-37 548.63 95066.34 4.47 19.924184 1.67 0.2416911 2.43 0.0349253 1.77 221.30048 3.849 219.80429 4.803 203.79086 38.664 221.3 3.8486 13MB056a-48 1424.5 53154.69 2.823 19.630525 1.54 0.2453867 2.42 0.0349367 1.87 221.37145 4.06 222.82182 4.841 238.15145 35.525 221.371 4.0595 13MB056a-228 710.81 33323.24 2.811 19.551455 2.07 0.2464002 3.65 0.0349397 3.01 221.3901 6.547 223.64782 7.331 247.47124 47.698 221.39 6.5468 13MB056a-159 686.11 42630.59 2.888 19.965711 2.13 0.2413327 2.93 0.0349462 2.02 221.43061 4.389 219.51116 5.786 198.9917 49.422 221.431 4.3891 13MB056a-257 962.48 33240.73 3.914 18.139975 2.29 0.2657006 3.47 0.0349565 2.6 221.49494 5.663 239.25049 7.39 417.35113 51.219 221.495 5.6635 13MB056a-84 1294.3 40604.39 2.522 15.453876 4.01 0.3119 4.56 0.0349584 2.17 221.50676 4.716 275.65263 11 764.85908 84.484 221.507 4.7158 13MB056a-325 478.38 32294.04 2.291 20.092815 2.65 0.2401622 3.88 0.0349981 2.82 221.75386 6.157 218.55326 7.622 184.19874 61.832 221.754 6.1573 13MB056a-314 655.25 118084.3 2.32 19.727727 2.34 0.2447893 3.12 0.0350242 2.07 221.91657 4.511 222.33466 6.239 226.76026 54.148 221.917 4.5112 13MB056a-20 223.13 10067.21 2.77 21.454076 3.59 0.2252216 4.05 0.0350444 1.86 222.04239 4.063 206.24638 7.552 29.371418 86.12 222.042 4.0634 13MB056a-118 324.53 42983.46 2.763 19.632495 3.13 0.2463249 4.66 0.0350738 3.45 222.22539 7.543 223.58651 9.351 237.91369 72.169 222.225 7.5427 13MB056a-278 312.16 62475.15 2.579 19.541255 2.35 0.2475335 3.22 0.0350821 2.2 222.27698 4.811 224.57066 6.493 248.67896 54.168 222.277 4.8106 13MB056a-71 839.93 49222.53 4.053 19.846267 2.03 0.2437299 3.79 0.0350822 3.2 222.2776 6.988 221.47014 7.537 212.87674 47.038 222.278 6.9884 13MB056a-62 628.86 29172.56 1.253 19.73055 1.75 0.245289 2.97 0.0351007 2.4 222.39313 5.249 222.74218 5.943 226.45387 40.461 222.393 5.2491 13MB056a-241 442.22 33187.24 2.648 20.09429 2.08 0.2410326 3.61 0.0351275 2.94 222.55988 6.438 219.26564 7.112 184.02637 48.538 222.56 6.4375 13MB056a-152 334.28 29737.33 2.233 20.466144 2.37 0.2366539 3.76 0.0351276 2.92 222.56049 6.389 215.67674 7.306 141.18411 55.581 222.56 6.3895 13MB056a-279 283.18 9032.956 2.74 19.528999 2.44 0.2480328 5.7 0.0351308 5.15 222.58041 11.26 224.97699 11.5 250.08703 56.223 222.58 11.264 13MB056a-305 841.75 83337.74 3.172 18.008655 2.23 0.2689823 3.75 0.0351321 3.02 222.58835 6.616 241.8797 8.081 433.55833 49.606 222.588 6.6156 13MB056a-217 621.63 31862.73 3.528 19.91636 1.99 0.243375 4.97 0.0351548 4.55 222.72998 9.96 221.18037 9.869 204.74712 46.163 222.73 9.96 13MB056a-240 412.63 38993.72 1.344 20.067285 2.54 0.2418089 4.25 0.0351933 3.41 222.96948 7.473 219.90058 8.41 187.15804 59.189 222.969 7.4726 13MB056a-147 323.64 31026.71 4.877 20.623488 2.67 0.2353091 3.49 0.0351965 2.25 222.98962 4.934 214.57195 6.755 123.14445 62.904 222.99 4.9335 13MB056a-10 647.32 56712.37 2.289 19.862319 2.61 0.2443803 3.54 0.0352042 2.38 223.03774 5.22 222.00095 7.051 211.02077 60.566 223.038 5.2203 13MB056a-76 771.22 63154.66 1.899 18.924906 3.01 0.2566115 4.29 0.0352216 3.06 223.14569 6.708 231.93263 8.904 321.97313 68.481 223.146 6.7078 13MB056a-170 764.5 122009.7 2.843 20.288679 1.85 0.2394409 3.54 0.0352331 3.02 223.21754 6.622 217.96255 6.947 161.60235 43.324 223.218 6.6224 13MB056a-114 349.57 11487.73 2.161 20.232644 1.68 0.2402654 5.77 0.0352568 5.51 223.36498 12.11 218.63777 11.34 168.02285 39.316 223.365 12.106 13MB056a-128 304.71 24609.73 3.264 20.041222 2.86 0.2427632 4.41 0.0352863 3.35 223.54859 7.366 220.68058 8.746 190.22815 66.653 223.549 7.3663 13MB056a-165 459.47 144458.6 1.49 20.093933 3.11 0.2422206 4.03 0.0353 2.55 223.63408 5.613 220.23714 7.971 184.0693 72.488 223.634 5.6131 13MB056a-248 499.84 25782.57 1.935 19.729179 2.57 0.2467122 4.17 0.0353019 3.28 223.64609 7.211 223.90197 8.373 226.60172 59.413 223.646 7.2106 13MB056a-65 1427.5 63032.95 1.214 20.11135 1.85 0.2421484 2.82 0.0353201 2.12 223.75906 4.671 220.17815 5.576 182.04986 43.09 223.759 4.6709 13MB056a-309 340.56 35992.01 2.534 20.039665 2.03 0.2431583 2.59 0.035341 1.6 223.8891 3.523 221.00336 5.136 190.40826 47.234 223.889 3.5229 13MB056a-63 1959.9 53469.4 3.149 18.067941 1.67 0.271703 3.23 0.0356042 2.76 225.52826 6.118 244.05436 7.004 426.23215 37.366 225.528 6.1177 13MB056a-289 213.06 48104.61 2.215 20.072189 2.38 0.2445868 3.47 0.0356063 2.53 225.54088 5.6 222.16949 6.922 186.58967 55.34 225.541 5.5996 13MB056a-112 205.25 16105.47 2.381 19.9288 2.63 0.2463777 3.79 0.0356108 2.72 225.56884 6.03 223.62953 7.6 203.28403 61.133 225.569 6.0299

160 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB056a-301 448.44 42091.74 3.508 17.975163 2.5 0.2737056 5.32 0.0356825 4.7 226.01536 10.43 245.65211 11.61 437.70281 55.611 226.015 10.43 13MB056a-232 691.78 30413.89 3.342 19.055986 2.26 0.2585453 3.42 0.0357328 2.57 226.32826 5.725 233.49394 7.143 306.22671 51.447 226.328 5.7254 13MB056a-285 478.57 20080.05 2.786 19.661391 2.42 0.2507203 4.89 0.0357522 4.25 226.449 9.459 227.16111 9.955 234.56161 55.814 226.449 9.4594 13MB056a-246 316 160802.7 3.723 19.908621 2.33 0.2476571 3.38 0.0357594 2.45 226.49424 5.442 224.67127 6.807 205.6342 54.058 226.494 5.4417 13MB056a-119 308.56 99779.26 4.052 20.114035 2.8 0.245673 3.35 0.035839 1.83 226.98908 4.076 223.05522 6.7 181.73924 65.32 226.989 4.0755 13MB056a-266 1173.6 26888.15 2.125 19.552407 2.13 0.252963 3.12 0.035872 2.28 227.19496 5.084 228.98023 6.392 247.36066 49.013 227.195 5.0838 13MB056a-109 907.96 37907.83 2.06 20.043169 1.93 0.2470357 2.84 0.0359108 2.09 227.43606 4.661 224.16539 5.714 190.0013 44.896 227.436 4.6611 13MB056a-6 600.31 28331.26 3.176 20.157248 2.72 0.2456743 3.6 0.0359161 2.36 227.46948 5.279 223.05632 7.213 176.73648 63.42 227.469 5.2791 13MB056a-193 350.25 112092 1.713 20.050673 2.83 0.2474663 5.56 0.0359868 4.79 227.90942 10.72 224.51598 11.2 189.08539 65.798 227.909 10.721 13MB056a-83 1169.4 40642.99 2.245 18.279211 2.89 0.2718046 3.29 0.036034 1.56 228.2031 3.499 244.13552 7.137 400.24518 64.862 228.203 3.4991 13MB056a-9 1730.4 51399.73 2.058 19.642509 1.92 0.253793 3.48 0.0361556 2.9 228.95929 6.528 229.65261 7.149 236.77269 44.243 228.959 6.5276 13MB056a-54 546.11 32112.72 1.784 17.873453 4.7 0.2808683 7.4 0.0364091 5.71 230.53636 12.93 251.34613 16.47 450.31981 104.46 230.536 12.929 13MB056a-214 318.72 28477.29 3.912 20.208966 2.25 0.2499605 3.49 0.0366365 2.67 231.95076 6.074 226.54412 7.084 170.75644 52.559 231.951 6.0742 13MB056a-85 665.72 55988.97 1.214 15.981612 2.17 0.3162882 2.9 0.0366608 1.91 232.10187 4.357 279.04328 7.064 693.73448 46.342 232.102 4.3572 13MB056a-263 364.88 93630.45 3.053 19.998731 2.72 0.2530324 4.04 0.0367009 2.99 232.35134 6.817 229.0364 8.283 195.16348 63.243 232.351 6.8167 13MB056a-328 396.28 241736.2 2.423 19.859432 3.22 0.256682 4.74 0.036971 3.48 234.03029 7.989 231.98958 9.832 211.36836 74.702 234.03 7.9894 13MB056a-101 375.74 20218.21 2.512 17.118032 7.23 0.3031591 7.63 0.0376377 2.41 238.17366 5.64 268.86466 18.02 545.47127 158.28 238.174 5.64 13MB056a-72 2228.9 45099.6 2.55 19.470912 1.21 0.2672284 2.02 0.037737 1.62 238.79063 3.802 240.47533 4.33 256.9658 27.786 238.791 3.8016 13MB056a-299 375.27 35002.01 0.666 19.655346 2.73 0.2801755 4.91 0.0399401 4.07 252.46193 10.09 250.79677 10.91 235.27131 63.116 252.462 10.088 13MB056a-74 450.46 26872.21 1.913 19.394536 2.27 0.3030589 3.79 0.042629 3.03 269.10818 7.998 268.7866 8.947 265.97202 52.032 269.108 7.9979 13MB056a-105 256.62 33840.7 1.321 18.843649 3.43 0.3166603 3.88 0.043277 1.82 273.11358 4.856 279.33034 9.478 331.71086 77.801 273.114 4.8561 13MB056a-77 66.433 30432.69 2.103 18.229767 6.12 0.3300687 10.7 0.0436399 8.8 275.35564 23.73 289.61828 27.02 406.31015 137.03 275.356 23.734 13MB056a-94 1106.8 149236.1 4.661 17.270031 2.29 0.3584675 3.28 0.0448995 2.35 283.13114 6.512 311.06992 8.786 526.14461 50.117 283.131 6.5121 13MB056a-78 627.16 22993.34 2.747 10.843731 7.4 0.5730513 10.1 0.0450683 6.94 284.17226 19.31 459.98604 37.56 1471.8858 140.63 284.172 19.307 13MB056a-95 87.296 7671.764 1.241 11.627008 13.5 0.5363712 15.1 0.0452306 6.65 285.17328 18.56 436.02908 53.46 1338.3138 262.51 285.173 18.561 13MB056a-61 1096.2 179231.2 14.29 17.899765 1.55 0.3854045 2.88 0.0500337 2.43 314.72862 7.46 331.00688 8.142 447.05205 34.512 314.729 7.4604 13MB056a-99 89.003 44763.97 1.633 18.813681 3.87 0.4125253 4.24 0.0562889 1.73 353.01703 5.957 350.69209 12.57 335.30787 87.709 353.017 5.9566 13MB056a-222 497.59 32217.65 2.816 16.6541 1.78 0.4780932 4.26 0.0577474 3.87 361.91173 13.63 396.76386 14 605.18659 38.541 361.912 13.628 13MB056a-252 608.89 60880.03 3.646 15.465965 1.59 0.5279641 6.64 0.0592216 6.44 370.88992 23.22 430.45763 23.28 763.21142 33.443 370.89 23.222 13MB056a-134 681.54 43710.51 7.196 18.120288 1.59 0.4839266 2.59 0.063598 2.05 397.46965 7.89 400.76323 8.59 419.77563 35.599 397.47 7.8897 13MB056a-225 620 39831.33 2.008 17.844377 2.4 0.5262619 4.18 0.0681086 3.43 424.75058 14.09 429.32582 14.65 453.9768 53.251 424.751 14.092 13MB056a-162 507.79 31730.29 4.24 17.89932 2 0.5375061 3.4 0.069778 2.75 434.81817 11.55 436.77887 12.06 447.10719 44.44 434.818 11.551 13MB056a-207 932.92 76167.16 1.496 17.489886 1.62 0.5573957 3.32 0.0707049 2.9 440.4009 12.32 449.82994 12.06 498.30232 35.7 440.401 12.325 13MB056a-262 508.31 195816 2.601 17.73229 1.63 0.55188 3.51 0.0709755 3.11 442.0298 13.28 446.22743 12.68 467.94567 36.195 442.03 13.281 13MB056a-24 474.71 167751.8 1.503 18.121185 2.37 0.5445077 2.93 0.0715631 1.73 445.56616 7.43 441.3923 10.49 419.66521 52.934 445.566 7.4299 13MB056a-87 683.53 43416.04 1.528 18.014671 2.37 0.5536606 10.4 0.0723384 10.1 450.2282 43.88 447.3918 37.52 432.81445 52.76 450.228 43.879 13MB056a-16 375.66 39429.67 0.425 17.233851 2.76 0.648007 3.79 0.0809955 2.6 502.06192 12.55 507.25156 15.13 530.7397 60.411 502.062 12.554 13MB056a-169 157.86 26449.66 0.811 17.491337 3.15 0.6622694 4.41 0.0840149 3.09 520.043 15.43 516.00121 17.86 498.12041 69.524 520.043 15.431 13MB056a-192 527.38 114067.2 2.261 16.961602 2.02 0.7056782 4.97 0.0868105 4.54 536.64638 23.39 542.1768 20.89 565.47598 43.97 536.646 23.393 13MB056a-244 71.475 25958.38 0.343 17.093653 3.2 0.7004026 6.27 0.0868323 5.39 536.77565 27.75 539.03135 26.22 548.60536 69.944 536.776 27.753 13MB056a-302 220.55 41443.09 1.631 16.5707 2.22 0.7241141 3.51 0.0870255 2.72 537.92153 14.05 553.09271 14.97 616.03566 47.838 537.922 14.045 13MB056a-276 789.84 82539.95 1.963 17.131859 2.49 0.7177001 4.12 0.0891756 3.28 550.65985 17.31 549.30824 17.48 543.70497 54.522 550.66 17.312 13MB056a-138 65.525 39121.38 1.684 16.963719 3.02 0.7432196 4.18 0.0914402 2.89 564.04877 15.62 564.28262 18.1 565.20386 65.746 564.049 15.62 13MB056a-319 469.09 91972.58 19.49 17.117482 1.77 0.7472557 3.35 0.0927701 2.84 571.89886 15.54 566.63084 14.54 545.54722 38.78 571.899 15.542 13MB056a-284 31.782 9445.395 3.335 16.448531 3.41 0.7821371 7.17 0.0933058 6.31 575.05861 34.73 586.7018 31.97 632.03478 73.374 575.059 34.73 13MB056a-258 454.34 55372.81 0.386 16.814686 2.18 0.7856768 3.52 0.0958145 2.77 589.83376 15.61 588.71658 15.75 584.39047 47.331 589.834 15.608 13MB056a-227 1014.9 176848.8 6.229 16.400017 1.47 0.820864 3.38 0.097637 3.04 600.54567 17.43 608.53034 15.46 638.39165 31.684 600.546 17.427 13MB056a-251 1172.2 94881.54 2.415 16.316834 1.88 0.8304833 3.82 0.0982801 3.33 604.32164 19.2 613.88032 17.62 649.27907 40.467 604.322 19.204 13MB056a-213 117.34 87155.29 4.952 16.521569 2.81 0.8673674 3.42 0.1039329 1.94 637.41619 11.77 634.13683 16.12 622.44516 60.704 637.416 11.771 13MB056a-28 100.62 57459.16 0.684 16.742052 3.19 0.8699258 4.03 0.1056306 2.46 647.32198 15.16 635.52698 19.05 593.82314 69.234 647.322 15.163 13MB056a-306 211.33 34291.63 1.789 16.349678 2.02 0.8982816 3.61 0.1065174 2.99 652.49046 18.56 650.80882 17.33 645.00266 43.35 652.49 18.555 13MB056a-297 67.497 27319.49 1.081 16.274236 2.67 0.9025293 3.52 0.1065272 2.29 652.54792 14.2 653.07837 16.95 654.8917 57.383 652.548 14.198 13MB056a-41 744.87 29927.55 2.782 16.574514 1.7 0.8942455 2.86 0.107497 2.3 658.195 14.41 648.64761 13.73 615.5393 36.75 658.195 14.414 13MB056a-23 435.93 48438.18 0.652 16.834647 1.44 0.8836562 3.07 0.1078912 2.71 660.48929 17.03 642.95547 14.62 581.81475 31.172 660.489 17.028 13MB056a-310 375.19 49677.81 3.994 16.165151 1.79 0.9376433 3.8 0.10993 3.35 672.34118 21.41 671.64789 18.68 669.32921 38.268 672.341 21.413 13MB056a-44 1702.1 216031.3 1.244 16.227988 1.56 0.9374074 3.24 0.1103295 2.84 674.66141 18.21 671.52429 15.94 661.03513 33.518 674.661 18.208 13MB056a-14 1554.1 79849.49 37.57 14.543207 1.56 1.1187703 5.89 0.1180049 5.68 719.06988 38.64 762.38604 31.58 891.58675 32.245 719.07 38.635 13MB056a-323 345.15 32288.76 1.575 15.106242 1.97 1.0775712 3.03 0.1180596 2.3 719.38528 15.67 742.44762 15.95 812.65691 41.153 719.385 15.674 13MB056a-195 87.699 24390.58 1.562 15.344136 2.3 1.0938342 3.45 0.1217286 2.57 740.50539 18.01 750.36497 18.31 779.85817 48.308 740.505 18.013 13MB056a-115 137.13 54620.08 1.628 15.395041 2.45 1.0988594 4.08 0.1226935 3.26 746.04834 22.96 752.79896 21.67 772.89056 51.502 746.048 22.962 13MB056a-329 71.792 23535.78 1.709 14.588944 3.87 1.1900555 6.15 0.1259186 4.78 764.53964 34.45 795.98606 33.94 885.06618 80.014 764.54 34.454 13MB056a-167 323.01 40603.5 0.989 15.064328 1.47 1.1827622 3.31 0.1292248 2.96 783.44174 21.84 792.59903 18.19 818.46276 30.771 783.442 21.835 13MB056a-30 290.12 47982.07 1.604 14.911623 2.04 1.2218669 2.96 0.132144 2.14 800.08512 16.12 810.62883 16.53 839.67285 42.553 800.085 16.125 13MB056a-140 265.95 36369.27 3.163 15.095974 1.34 1.2302566 3.29 0.1346963 3 814.60119 22.97 814.45565 18.41 814.07796 27.99 814.601 22.97 13MB056a-5 191.36 25568.01 2.893 15.002254 2.49 1.2453647 3.94 0.1355039 3.06 819.18782 23.56 821.3108 22.22 827.05346 51.866 819.188 23.562 13MB056a-146 152.71 52897.6 1.548 14.820499 1.6 1.2872658 2.63 0.1383661 2.08 835.41672 16.33 840.08443 15.01 852.45692 33.18 835.417 16.333 13MB056a-265 374.98 43321.61 2.002 15.077548 1.87 1.2668629 4.06 0.1385349 3.6 836.37207 28.27 830.98632 23.06 816.63128 39.164 836.372 28.271 13MB056a-36 1137.3 493666.8 28.58 14.731303 1.24 1.3103028 2.54 0.1399947 2.21 844.6324 17.5 850.26005 14.6 864.99354 25.793 844.632 17.497 13MB056a-56 990.07 144317.6 5.091 14.544891 1.72 1.3773994 2.87 0.1453012 2.3 874.56971 18.82 879.32903 16.91 891.34709 35.59 874.57 18.818 13MB056a-38 67.542 151399 2.055 14.486499 2.39 1.4789666 4.88 0.1553891 4.25 931.10177 36.84 921.80714 29.55 899.61094 49.373 899.611 49.373 13MB056a-231 366.95 47742.82 3.741 14.336649 1.74 1.4468407 3.24 0.1504413 2.73 903.43664 23.03 908.56239 19.46 921.06019 35.854 921.06 35.854 13MB056a-290 691.64 97576.6 2.543 14.192914 1.86 1.5410241 3.28 0.158628 2.7 949.14751 23.86 946.91293 20.21 941.74005 38.136 941.74 38.136 13MB056a-255 406.51 89038.68 1.692 14.094637 1.39 1.5836407 2.58 0.161886 2.17 967.24921 19.52 963.8011 16.06 955.92383 28.425 955.924 28.425 13MB056a-283 68.426 25473.29 0.495 14.042972 2.5 1.5256488 4.42 0.1553862 3.65 931.08539 31.64 940.75035 27.14 963.46731 51.069 963.467 51.069 13MB056a-106 264.39 105154.6 2.172 14.01618 2.19 1.6089986 3.62 0.1635626 2.88 976.54486 26.12 973.71831 22.68 967.32844 44.714 967.328 44.714 13MB056a-66 420.29 93435.08 1.03 13.981422 1.69 1.6653308 3.03 0.1688693 2.51 1005.878 23.41 995.4086 19.23 972.3923 34.565 972.392 34.565 13MB056a-53 951.57 62298.21 12.42 13.909621 2.18 1.4806096 6.75 0.149367 6.39 897.41397 53.52 922.47993 40.93 982.92307 44.392 982.923 44.392

161 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13MB056a-209 130.5 91764.14 2.038 13.908773 2.33 1.7063792 3.25 0.1721326 2.27 1023.8505 21.47 1010.9272 20.81 983.04676 47.38 983.047 47.38 13MB056a-70 89.264 50432.79 3.762 13.908674 2.41 1.5541851 3.92 0.1567787 3.1 938.85062 27.06 952.15844 24.25 983.06087 49.053 983.061 49.053 13MB056a-221 434.31 81702.41 3.082 13.870602 1.3 1.5429799 5.07 0.1552224 4.9 930.17152 42.4 947.69416 31.22 988.62263 26.477 988.623 26.477 13MB056a-308 277.55 117791.8 1.155 13.843849 1.34 1.6842363 2.96 0.1691058 2.64 1007.1827 24.65 1002.5854 18.89 992.5655 27.274 992.566 27.274 13MB056a-93 212.75 34746.87 3.216 13.838521 2.2 1.4256388 3.46 0.1430863 2.67 862.09089 21.57 899.72577 20.67 993.32436 44.746 993.324 44.746 13MB056a-181 408.79 102606.5 4.941 13.828881 1.7 1.6496062 3.58 0.1654497 3.15 986.99137 28.79 989.40044 22.62 994.75099 34.62 994.751 34.62 13MB056a-15 591.36 146566.3 3.187 13.757729 1.18 1.5562947 3.32 0.1552878 3.11 930.53653 26.93 952.99672 20.55 1005.2044 23.853 1005.2 23.853 13MB056a-73 736.44 59793.52 2.569 13.734055 1.49 1.61111 3.58 0.1604807 3.25 959.44746 28.96 974.53971 22.4 1008.6987 30.286 1008.7 30.286 13MB056a-197 510.8 59908.1 2.822 13.46556 1.35 1.742829 5.02 0.1702072 4.84 1013.2527 45.37 1024.5112 32.43 1048.6556 27.293 1048.66 27.293 13MB056a-151 381.35 80840.55 0.875 13.405776 1.44 1.8488093 2.52 0.1797557 2.06 1065.6401 20.25 1063.0056 16.58 1057.6215 29.035 1057.62 29.035 13MB056a-120 199.31 37329.83 2.55 13.188953 4.75 1.6967014 5.83 0.1622985 3.39 969.53746 30.49 1007.2898 37.28 1090.3306 95.202 1090.33 95.202 13MB056a-111 424.5 94362.67 2.552 13.161284 1.88 1.926651 2.98 0.1839078 2.3 1088.2876 23.06 1090.378 19.89 1094.5744 37.741 1094.57 37.741 13MB056a-129 526.35 111607.4 9.103 13.136436 2.06 1.8260435 3.4 0.1739752 2.71 1033.9766 25.89 1054.8588 22.32 1098.3562 41.116 1098.36 41.116 13MB056a-243 174.89 187877.3 1.436 13.029811 2.29 1.977879 3.47 0.1869117 2.6 1104.6237 26.39 1107.9975 23.37 1114.6066 45.728 1114.61 45.728 13MB056a-330 376.37 46917.01 0.938 12.98984 2.06 1.7821952 5.47 0.1679027 5.07 1000.5455 46.96 1038.9808 35.6 1120.7751 41.138 1120.78 41.138 13MB056a-96 589.37 30151.1 1.643 12.950492 1.21 1.443342 5.31 0.1355671 5.17 819.54651 39.81 907.10947 31.87 1126.7843 24.121 1126.78 24.121 13MB056a-22 220.28 134017.2 1.313 12.812219 2.09 2.0143239 2.59 0.187177 1.53 1106.0641 15.54 1120.3489 17.59 1148.1772 41.595 1148.18 41.595 13MB056a-175 290.71 195544.2 1.42 12.658376 1.41 2.0945881 3.25 0.1922983 2.92 1133.8131 30.39 1147.0324 22.32 1172.1314 27.97 1172.13 27.97 13MB056a-122 76.248 33750.62 0.772 12.651913 1.9 2.026826 3.19 0.1859822 2.56 1099.5732 25.88 1124.5515 21.7 1173.141 37.716 1173.14 37.716 13MB056a-82 454.78 52132.72 0.564 11.936267 1.49 2.4709049 3.36 0.2139062 3.01 1249.5947 34.18 1263.5582 24.28 1287.3902 28.987 1287.39 28.987 13MB056a-219 183.45 224357.2 0.815 11.323872 1.53 2.8444792 3.29 0.2336127 2.91 1353.4054 35.54 1367.3536 24.72 1389.1977 29.393 1389.2 29.393 13MB056a-234 443.9 40097.82 2.172 11.285687 1.48 2.932733 3.09 0.2400486 2.71 1386.9499 33.82 1390.3991 23.39 1395.6776 28.398 1395.68 28.398 13MB056a-230 662.22 104086.5 1.427 10.860097 1.69 2.9813419 4.21 0.2348249 3.86 1359.737 47.33 1402.8724 32.04 1469.0229 32.019 1469.02 32.019 13MB056a-142 176.89 38293.27 1.266 10.098135 2.14 3.7846431 3.46 0.2771819 2.72 1577.1539 38 1589.4922 27.79 1605.8801 39.943 1605.88 39.943 13MB056a-168 783.12 155261.9 9.755 9.9946911 1.61 3.5838452 2.91 0.259787 2.42 1488.7518 32.21 1545.9595 23.09 1625.0526 29.907 1625.05 29.907 13MB056a-324 153.63 196172.5 1.315 9.8770514 1.81 3.914708 3.86 0.2804306 3.41 1593.5306 48.14 1616.7257 31.24 1647.0442 33.619 1647.04 33.619 13MB056a-327 303.48 65321.82 2.615 9.1045246 1.72 4.9413743 3.84 0.32629 3.43 1820.3743 54.44 1809.3522 32.43 1796.6629 31.262 1796.66 31.262 13MB056a-33 749 232774.2 0.951 9.0267336 1.89 4.8952358 4.24 0.3204815 3.8 1792.0802 59.38 1801.4363 35.78 1812.2673 34.424 1812.27 34.424 13MB056a-264 185.98 61522.65 2.019 8.8685257 1.88 5.0142699 3.55 0.3225209 3.01 1802.0286 47.32 1821.7342 30.04 1844.325 33.988 1844.33 33.988 13MB056a-55 228.03 45615.07 2.174 8.8100875 1.68 4.5641945 3.14 0.2916373 2.65 1649.7061 38.56 1742.755 26.12 1856.2767 30.309 1856.28 30.309 13MB056a-254 132.22 83427.66 4.819 8.5813228 2.25 4.6523599 4.63 0.2895518 4.05 1639.289 58.57 1758.7177 38.7 1903.6803 40.369 1903.68 40.369 13MB056a-204 594.06 394652.2 6.045 8.5067257 1.88 4.8304235 3.42 0.2980207 2.85 1681.4861 42.25 1790.2113 28.77 1919.3536 33.757 1919.35 33.757 13MB056a-267 138.54 54628.4 2.294 8.2013641 1.72 5.8705061 5.16 0.3491888 4.86 1930.724 81.15 1956.8846 44.79 1984.6568 30.655 1984.66 30.655 13MB056a-282 992.03 180350.3 6.951 8.1166538 1.51 4.9179614 3.58 0.2895082 3.25 1639.0711 46.98 1805.343 30.2 2003.1111 26.743 2003.11 26.743 13MB056a-127 249.74 159009.8 2.124 7.3522504 1.89 7.5185299 3.58 0.4009147 3.05 2173.2497 56.18 2175.198 32.12 2177.0227 32.864 2177.02 32.864 13MB056a-216 155.71 116648.9 0.351 6.2409562 1.51 9.1297319 3.15 0.4132453 2.77 2229.7416 52.15 2351.0939 28.85 2458.0963 25.51 2458.1 25.51 13MB056a-190 268.49 63013.94 1.361 6.1346074 1.79 8.5110399 3.43 0.3786763 2.93 2070.0972 51.91 2287.1028 31.21 2487.1054 30.128 2487.11 30.128 13MB056a-51 203.74 131597.4 1.416 6.1330107 1.55 10.275253 5.03 0.4570513 4.78 2426.5253 96.69 2459.8774 46.55 2487.5442 26.16 2487.54 26.16 13MB056a-273 507.68 182905.1 1.161 6.0494546 1.39 10.414198 2.97 0.4569206 2.63 2425.9472 53.15 2472.3136 27.56 2510.6343 23.399 2510.63 23.399 13MB056a-8 526.11 110959.2 1.164 5.9707461 1.68 10.720663 3.41 0.4642468 2.97 2458.2821 60.74 2499.2165 31.73 2532.635 28.226 2532.64 28.226 13MB056a-270 124.79 50586.45 1.557 5.857605 1.83 11.988922 3.07 0.5093296 2.47 2653.767 53.68 2603.5405 28.8 2564.6821 30.614 2564.68 30.614 13MB056a-126 185.81 81300.89 3.304 5.8255651 1.21 11.303104 3.37 0.4775672 3.15 2516.6605 65.57 2548.4608 31.46 2573.8532 20.227 2573.85 20.227 13MB056a-307 284.06 67251.69 5.265 5.5745883 1.87 11.385751 3.4 0.4603341 2.84 2441.0332 57.67 2555.2588 31.71 2647.1812 30.953 2647.18 30.953 13MB056a-286 638.83 112479.7 2.94 5.5186413 0.81 12.031416 2.74 0.4815569 2.62 2534.0437 54.83 2606.857 25.68 2663.9079 13.362 2663.91 13.362 13MB056a-107 240.29 176037.2 1.327 5.359784 1.71 12.762058 3.26 0.4960971 2.77 2597.0012 59.3 2662.2484 30.71 2712.1876 28.25 2712.19 28.25 13MB056a-52 616.57 1312423 4.089 4.7142857 1.2 13.58603 2.73 0.464523 2.45 2459.4977 50.14 2721.2918 25.84 2921.8116 19.494 2921.81 19.494 13MB056a-172 351.38 15739940 3.394 4.0735447 1.57 20.085077 2.61 0.5933961 2.09 3003.176 50.22 3095.4618 25.29 3155.8732 24.866 3155.87 24.866 14EG27 14EG27-23 111.51 2370.551 0.564 23.970608 11 0.208408 11.1 0.036232 1.88 229.43466 4.245 192.2159 19.51 243.52421 278.21 229.435 4.2445 14EG27-22 515.73 17779.79 1.915 19.574265 2.53 0.2599455 2.6 0.0369034 0.61 233.61018 1.405 234.623 5.443 244.78287 58.183 233.61 1.4052 14EG27-56 216.51 11829.66 1.099 21.619924 5.03 0.2478825 5.19 0.0388686 1.29 245.81615 3.115 224.8547 10.47 10.883377 120.96 245.816 3.1147 14EG27-15 117.23 3349.075 1.025 20.084936 9.35 0.2678413 9.46 0.0390164 1.43 246.73296 3.457 240.9663 20.3 185.11128 218.18 246.733 3.4566 14EG27-17 96.671 2184.205 1.118 21.630462 11.7 0.2541575 11.8 0.0398719 1.79 252.03919 4.428 229.94774 24.28 9.6846099 281.33 252.039 4.428 14EG27-64 161.14 6792.029 0.55 20.87735 6.07 0.2643105 6.23 0.0400211 1.42 252.9635 3.532 238.13468 13.23 94.278326 143.78 252.963 3.5325 14EG27-24 384.34 8754.905 1.635 19.532666 3 0.2911006 3.09 0.0412385 0.74 260.50546 1.9 259.42531 7.076 249.69299 69.073 260.505 1.9 14EG27-94 461.93 16469.08 1.183 19.818794 2.23 0.2958924 2.36 0.0425314 0.76 268.50478 2.011 263.18686 5.47 216.08539 51.681 268.505 2.0114 14EG27-29 94.703 6582.672 0.651 21.902357 7.88 0.2695275 8.09 0.0428147 1.81 270.2561 4.798 242.31588 17.43 -20.429597 190.92 270.256 4.7979 14EG27-3 300.14 11378 2.876 19.238011 3.49 0.3082001 3.58 0.0430023 0.82 271.41582 2.191 272.78491 8.571 284.56023 79.746 271.416 2.1912 14EG27-78 545.5 4305.055 2.309 19.327835 2.06 0.3177047 2.13 0.0445354 0.54 280.88456 1.486 280.13543 5.21 273.86381 47.174 280.885 1.4857 14EG27-2 266.35 17038.18 1.13 19.652316 3.86 0.3222073 3.96 0.0459249 0.9 289.45387 2.541 283.59908 9.799 235.62813 89.015 289.454 2.541 14EG27-76 216.06 7704.391 1.073 20.194989 4.17 0.3298056 4.29 0.0483059 1 304.1125 2.982 289.41743 10.8 172.37233 97.313 304.113 2.9816 14EG27-98 38.153 4708.411 2.231 15.965089 13.5 0.4366373 14 0.0505581 3.72 317.94726 11.53 367.87856 43.26 695.93076 289.06 317.947 11.533 14EG27-33 61.296 2250.643 0.839 17.163427 13.2 0.4142036 13.5 0.0515604 2.57 324.09472 8.127 351.89781 40.08 539.66071 290.37 324.095 8.1266 14EG27-92 341.27 6720.206 1.255 19.154934 2.84 0.3985512 3.07 0.0553686 1.17 347.39784 3.941 340.59692 8.889 294.44097 64.9 347.398 3.9415 14EG27-36 270.66 13991.13 1.583 18.641193 2.27 0.4808903 2.37 0.0650157 0.68 406.05686 2.694 398.68352 7.806 356.1645 51.16 406.057 2.6938 14EG27-71 342.23 12885.67 1.51 18.391583 2.15 0.4903762 2.22 0.0654105 0.56 408.44568 2.198 405.16685 7.423 386.49701 48.321 408.446 2.1978 14EG27-4 142.28 650.5971 1.42 21.496827 13 0.4197688 13 0.065446 1.43 408.66079 5.644 355.88569 39.18 24.599878 312.2 408.661 5.6438 14EG27-21 99.833 8281.271 1.25 18.88145 6.33 0.486781 6.44 0.0666604 1.19 416.00399 4.8 402.71454 21.41 327.18078 143.79 416.004 4.7995 14EG27-10 208.42 8365.103 10.49 19.368915 3.51 0.482754 3.6 0.0678156 0.76 422.98218 3.119 399.96059 11.89 268.99709 80.608 422.982 3.1193 14EG27-63 80.203 8869.588 1.241 19.815786 6.46 0.4759295 6.72 0.0683995 1.82 426.50569 7.51 395.2764 21.99 216.45577 149.8 426.506 7.5099 14EG27-34 91.079 2749.036 1.659 19.061585 6.23 0.4981591 6.32 0.0688693 1.07 429.34011 4.461 410.45551 21.35 305.5956 142.1 429.34 4.4605 14EG27-68 302.49 13360.43 7.658 18.619205 1.79 0.5175182 1.87 0.0698852 0.54 435.46422 2.275 423.49211 6.483 358.80418 40.46 435.464 2.2748 14EG27-12 172.57 6792.74 1.156 17.807262 3.26 0.5412483 3.36 0.0699025 0.84 435.56795 3.551 439.24726 12 458.57003 72.266 435.568 3.5513 14EG27-89 164.2 8088.331 1.035 18.961501 4.43 0.5142922 4.59 0.0707264 1.2 440.53035 5.124 421.33132 15.82 317.53771 100.65 440.53 5.1242 14EG27-57 118.49 29454.23 1.408 18.130334 3.3 0.5462533 3.64 0.0718288 1.55 447.1642 6.697 442.53924 13.07 418.53824 73.628 447.164 6.6966 14EG27-43 167.72 15011.08 2.635 18.14656 3.51 0.5468473 3.63 0.0719713 0.94 448.02102 4.06 442.92927 13.03 416.54046 78.329 448.021 4.0603 14EG27-27 104.66 4253.09 1.795 19.721896 6.71 0.5058573 6.8 0.0723561 1.11 450.33508 4.829 415.6596 23.2 227.4655 155.17 450.335 4.8287

162 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 14EG27-31 204.84 8472.823 1.284 18.801065 3.24 0.5319092 3.39 0.0725302 0.99 451.38117 4.305 433.07592 11.95 336.84976 73.441 451.381 4.3046 14EG27-53 98.831 16864.82 1.884 18.868005 4.7 0.5400957 4.85 0.0739087 1.18 459.66128 5.219 438.48761 17.26 328.76827 106.72 459.661 5.2186 14EG27-60 313.43 12308.2 2.626 17.812793 1.85 0.5771675 1.95 0.0745646 0.61 463.59736 2.726 462.63949 7.243 457.90223 41.074 463.597 2.7259 14EG27-38 146.54 6007.952 1.796 18.411723 4.65 0.6292332 4.87 0.0840243 1.46 520.09866 7.3 495.61812 19.11 384.03827 104.49 520.099 7.3004 14EG27-32 87.964 5179.944 1.294 16.848793 3.79 0.7308088 4.39 0.0893041 2.21 551.42005 11.66 557.02781 18.82 579.99096 82.44 551.42 11.657 14EG27-82 203.78 21687 4.95 15.040302 1.46 1.0916653 1.73 0.1190816 0.92 725.2756 6.334 749.31261 9.159 821.79669 30.522 725.276 6.3339 14EG27-40 82.452 7010.431 1.095 16.315758 3.75 1.0692416 3.83 0.1265266 0.81 768.01996 5.85 738.36846 20.11 649.43877 80.449 768.02 5.8504 14EG27-28 140.6 8501.201 0.388 15.726262 1.88 1.1132854 2.18 0.1269787 1.11 770.60627 8.041 759.75406 11.69 727.97271 39.935 770.606 8.0409 14EG27-25 141.93 15307.84 1.11 15.628937 1.88 1.121988 2 0.1271793 0.69 771.75376 5.048 763.92688 10.76 741.07752 39.737 771.754 5.0475 14EG27-83 52.991 8613.321 2.154 17.021542 6.03 1.0589832 6.15 0.1307334 1.2 792.04829 8.979 733.32212 32.13 557.819 131.64 792.048 8.9789 14EG27-81 335.54 30603.57 2.663 15.156766 0.77 1.1949511 0.91 0.1313577 0.48 795.60599 3.613 798.2533 5.014 805.63003 16.096 795.606 3.613 14EG27-18 521.67 8231.462 3.825 14.602324 0.6 1.3285655 0.75 0.1407031 0.44 848.63709 3.501 858.25497 4.316 883.20488 12.427 848.637 3.5006 14EG27-100 122.54 8923.272 1.308 14.071402 1.85 1.5270016 1.99 0.1558388 0.74 933.61037 6.461 941.29405 12.23 959.29581 37.758 959.296 37.758 14EG27-11 69.511 1074.903 0.415 13.352085 11.1 1.6434253 14.5 0.1591468 9.28 952.03338 82.18 987.02903 91.62 1065.6948 223.94 1065.69 223.94 14EG27-99 418.17 34131.01 8.317 13.16942 0.47 1.8132151 1.12 0.1731868 1.02 1029.6457 9.667 1050.2391 7.313 1093.2991 9.3408 1093.3 9.3408 14EG27-97 426.97 39954.83 1.898 13.106592 0.4 1.9898443 0.94 0.1891506 0.85 1116.7718 8.714 1112.0692 6.34 1102.8686 7.9309 1102.87 7.9309 14EG27-39 419.9 58048.59 1.081 13.06545 0.47 1.9479397 0.86 0.1845859 0.73 1091.9793 7.285 1097.7372 5.78 1109.1515 9.3077 1109.15 9.3077 14EG27-72 202.67 18272.26 3.926 12.934649 0.82 1.9809027 0.99 0.1858303 0.56 1098.7475 5.616 1109.028 6.677 1129.2421 16.325 1129.24 16.325 14EG27-49 359.14 35963.22 1.379 12.521614 0.4 2.2120299 0.59 0.2008862 0.43 1180.079 4.628 1184.8536 4.119 1193.5841 7.9604 1193.58 7.9604 14EG27-50 99.569 18796.19 0.632 12.307746 1.28 2.349021 1.51 0.2096835 0.81 1227.1311 9.062 1227.2611 10.78 1227.4701 25.1 1227.47 25.1 14EG27-47 77.192 17460.38 1.201 11.972566 1.56 2.5606741 1.68 0.2223516 0.63 1294.2889 7.4 1289.4856 12.28 1281.4787 30.386 1281.48 30.386 14EG27-54 365.9 31060.29 0.958 11.889458 0.36 2.4853806 1.06 0.2143156 1 1251.7685 11.37 1267.7842 7.692 1295.0362 7.0107 1295.04 7.0107 14EG27-35 139.25 16281.08 1.327 11.794489 1.04 2.4202425 1.82 0.2070317 1.5 1212.9841 16.55 1248.6282 13.1 1310.6175 20.216 1310.62 20.216 14EG27-84 171.92 15161.28 0.925 11.607783 0.72 2.7058372 1.15 0.2277979 0.89 1322.9475 10.68 1330.0596 8.51 1341.5111 13.943 1341.51 13.943 14EG27-73 211.41 23288.09 1.516 11.386069 0.5 2.9142343 0.66 0.2406562 0.43 1390.1073 5.386 1385.6117 4.985 1378.6774 9.5974 1378.68 9.5974 14EG27-13 71.657 14898.49 0.747 11.216941 2.21 3.1269369 2.38 0.2543855 0.87 1461.0525 11.38 1439.3415 18.31 1407.3848 42.412 1407.38 42.412 14EG27-7 280.34 27233.42 1.197 10.93361 0.44 3.1342014 0.67 0.2485359 0.51 1430.9209 6.546 1441.1273 5.176 1456.2033 8.3307 1456.2 8.3307 14EG27-9 113.44 27971.15 0.813 10.174044 0.74 3.7327835 1.1 0.2754388 0.81 1568.35 11.29 1578.4267 8.791 1591.9032 13.811 1591.9 13.811 14EG27-77 73.614 13297.16 0.978 10.124366 1.23 3.9395411 1.34 0.2892759 0.54 1637.9095 7.803 1621.8434 10.88 1601.0414 22.961 1601.04 22.961 14EG27-30 33.487 8266.653 0.666 9.7942294 2.39 4.2792694 2.59 0.3039755 1.02 1710.9924 15.29 1689.3819 21.35 1662.6469 44.156 1662.65 44.156 14EG27-41 126.31 16149.57 0.796 9.719904 0.57 4.1791304 1.57 0.2946094 1.47 1664.5224 21.52 1669.9367 12.89 1676.7317 10.494 1676.73 10.494 14EG27-52 196.45 30395.58 2.44 9.5000265 0.53 3.7203146 0.71 0.2563322 0.47 1471.0494 6.129 1575.748 5.673 1718.8941 9.8194 1718.89 9.8194 14EG27-44 72.521 9131.984 1.953 9.4701758 1.31 3.937857 1.63 0.2704685 0.97 1543.1796 13.25 1621.4971 13.2 1724.6762 24.116 1724.68 24.116 14EG27-58 542.06 66698.51 0.896 9.4303125 0.16 4.5296789 0.75 0.3098077 0.73 1739.7605 11.18 1736.4368 6.241 1732.4196 2.9504 1732.42 2.9504 14EG27-90 93.832 25259.16 1.845 8.741623 0.5 5.3343787 0.79 0.3382008 0.61 1878.0083 9.973 1874.3887 6.784 1870.3627 9.1034 1870.36 9.1034 14EG27-75 210.87 47903.26 2.723 8.6816742 0.26 5.484108 0.55 0.3453092 0.49 1912.1606 8.062 1898.1106 4.732 1882.7676 4.6366 1882.77 4.6366 14EG27-37 146.06 40758.72 3.629 8.6347798 0.39 5.5557017 0.64 0.3479276 0.51 1924.6951 8.444 1909.2605 5.496 1892.5142 6.9769 1892.51 6.9769 14EG27-85 234.79 54256.71 7.307 8.6239314 0.29 5.5379577 0.91 0.3463807 0.86 1917.2926 14.3 1906.5084 7.826 1894.7758 5.2211 1894.78 5.2211 14EG27-19 183.07 42587.8 2.197 8.6232637 0.35 5.5689957 0.52 0.348295 0.38 1926.4519 6.357 1911.3174 4.456 1894.9151 6.2857 1894.92 6.2857 14EG27-69 173.81 35825.63 1.362 8.6222474 0.29 5.4732769 0.67 0.3422683 0.61 1897.5724 9.997 1896.4131 5.793 1895.1271 5.255 1895.13 5.255 14EG27-87 289.49 50742.37 2.321 8.6135679 0.21 5.5116872 0.56 0.3443233 0.52 1907.4343 8.545 1902.4203 4.804 1896.9384 3.797 1896.94 3.797 14EG27-51 194.52 39358.38 1.599 8.6093996 0.35 5.577524 0.86 0.3482676 0.78 1926.3206 13.01 1912.6348 7.368 1897.8088 6.2693 1897.81 6.2693 14EG27-93 188.66 35986.34 3.224 8.596246 0.37 5.65289 0.93 0.3524342 0.85 1946.2118 14.25 1924.203 7.998 1900.5576 6.7253 1900.56 6.7253 14EG27-61 208.47 44095.33 3.459 8.5943174 0.32 5.5956313 0.65 0.3487861 0.57 1928.7995 9.446 1915.4262 5.61 1900.961 5.7682 1900.96 5.7682 14EG27-70 199.13 29421.96 1.984 8.5690353 0.28 5.4932938 0.61 0.3414 0.55 1893.401 8.948 1899.5481 5.272 1906.2546 5.0548 1906.25 5.0548 14EG27-14 217.19 57182.06 2.619 8.2889409 0.27 5.9312693 0.57 0.3565705 0.51 1965.8973 8.592 1965.8252 4.983 1965.7317 4.7755 1965.73 4.7755 14EG27-86 311.3 50788.2 3.086 8.1361146 0.2 6.1574733 0.81 0.3633443 0.78 1998.0062 13.47 1998.4333 7.061 1998.8612 3.4871 1998.86 3.4871 14EG27-26 129.27 35257.8 2.04 8.0850553 0.4 5.9596534 0.65 0.3494642 0.52 1932.0396 8.67 1969.9748 5.674 2010.0358 7.0098 2010.04 7.0098 14EG27-48 172.44 23314.72 2.123 7.9888951 0.37 6.0081141 0.69 0.3481157 0.58 1925.5945 9.691 1977.0205 5.991 2031.2418 6.4977 2031.24 6.4977 14EG27-80 292.36 59284.42 2.404 7.0588246 0.18 7.5679833 0.45 0.3874461 0.41 2110.9731 7.367 2181.0757 4.004 2247.665 3.0844 2247.67 3.0844 14EG27-66 193.76 45032.72 1.667 7.0307178 0.25 7.680719 0.78 0.3916519 0.74 2130.485 13.41 2194.3487 6.998 2254.5571 4.2336 2254.56 4.2336 14EG27-42 132.55 34251.04 1.117 6.3327858 0.29 8.4066113 1.6 0.3861131 1.57 2104.7766 28.17 2275.8925 14.48 2433.3709 4.902 2433.37 4.902 14EG27-67 101.03 30770.32 2.138 6.1867255 0.3 9.4255483 0.66 0.4229278 0.59 2273.757 11.22 2380.3212 6.054 2472.8344 5.1271 2472.83 5.1271 14EG27-59 251.97 45823.05 1.29 6.0732355 0.14 10.582998 0.44 0.466152 0.42 2466.6642 8.562 2487.2197 4.095 2504.0399 2.397 2504.04 2.397 14EG27-8 290.76 47660.91 0.932 5.9588551 0.14 10.753861 0.53 0.464757 0.52 2460.5279 10.56 2502.0885 4.959 2535.9798 2.2881 2535.98 2.2881 14EG27-5 211.68 46766.37 1.272 5.9101256 0.15 11.195907 0.76 0.4799044 0.74 2526.8492 15.52 2539.575 7.055 2549.745 2.4733 2549.74 2.4733 14EG27-62 154.26 60867.62 0.657 4.3254807 0.16 18.496367 1.57 0.5802559 1.56 2949.7939 37 3015.9193 15.14 3060.2788 2.5428 3060.28 2.5428 14EG06b 14EG06b-18 216.66 4879.918 1.704 21.015496 7.47 0.2189278 7.58 0.0333687 1.29 211.5974 2.677 201.01702 13.83 78.610129 177.63 211.597 2.6774 14EG06b-6 255.58 3877.533 1.799 22.7803 6.08 0.2036591 6.17 0.0336482 1.04 213.34085 2.175 188.21768 10.6 -116.41136 150.06 213.341 2.1746 14EG06b-68 303.67 21559.32 3.03 21.021896 4.74 0.2226507 4.86 0.0339465 1.05 215.20072 2.225 204.11354 8.982 77.886274 112.7 215.201 2.2247 14EG06b-53 211.71 5311.341 0.712 21.599675 6.53 0.217131 6.67 0.0340148 1.37 215.62658 2.912 199.51914 12.08 13.097005 157.09 215.627 2.9124 14EG06b-91 275.16 5919.199 0.931 21.555572 4.93 0.2180606 5.03 0.0340907 1.02 216.09968 2.174 200.29442 9.145 18.003563 118.37 216.1 2.1743 14EG06b-9 543.5 11505.3 1.611 19.893888 2.42 0.2375858 2.5 0.0342799 0.62 217.27892 1.332 216.44168 4.874 207.34676 56.155 217.279 1.3322 14EG06b-31 414.75 15412.36 1.581 20.73352 3.37 0.2284869 3.49 0.0343584 0.91 217.76851 1.94 208.94882 6.596 110.61119 79.654 217.769 1.9403 14EG06b-65 395.7 10058.68 1.215 20.182167 3.74 0.2415868 3.92 0.0353622 1.19 224.02161 2.611 219.71898 7.754 173.85459 87.298 224.022 2.611 14EG06b-45 562.96 10129.03 1.367 20.148204 3.06 0.2519034 3.17 0.0368103 0.83 233.03121 1.897 228.12119 6.476 177.78312 71.332 233.031 1.8973 14EG06b-12 397.3 8961.254 1.419 20.770462 3.74 0.2496316 3.8 0.0376049 0.7 237.96993 1.635 226.27692 7.71 106.39132 88.3 237.97 1.6348 14EG06b-94 541.67 3174.181 1.625 19.8617 2.92 0.2673414 3.05 0.0385107 0.87 243.59496 2.083 240.56592 6.537 211.07637 67.798 243.595 2.0825 14EG06b-11 619.81 13358.8 1.359 19.76603 2.29 0.2865822 2.39 0.0410835 0.71 259.5455 1.81 255.86563 5.416 222.29921 52.894 259.546 1.8098 14EG06b-81 190.62 4591.898 1.288 21.493927 6.19 0.2780316 6.29 0.043342 1.14 273.5149 3.057 249.09489 13.9 24.878951 148.56 273.515 3.0574 14EG06b-40 138.04 6662.842 2.89 20.508457 6.65 0.2987298 6.8 0.0444335 1.46 280.25534 4.008 265.40765 15.89 136.30229 156.3 280.255 4.0083 14EG06b-100 143.7 7430.323 1.007 21.133068 5.72 0.3115534 5.92 0.0477522 1.52 300.70688 4.469 275.38434 14.28 65.342785 136.24 300.707 4.4689 14EG06b-32 258.58 9150.893 1.208 18.97075 3.74 0.3752985 3.83 0.0516369 0.84 324.56335 2.674 323.57293 10.62 316.4295 84.993 324.563 2.6737 14EG06b-38 77.963 7831.56 1.02 19.927077 8.01 0.3671963 8.23 0.053069 1.89 333.33581 6.138 317.57335 22.45 203.46509 186.19 333.336 6.1378 14EG06b-27 653.04 18931.37 0.49 18.81095 1.24 0.3956927 1.37 0.0539843 0.59 338.93672 1.941 338.51942 3.95 335.65752 28.08 338.937 1.9408 14EG06b-44 235.43 23856.41 2.198 17.837065 2.82 0.5009919 2.9 0.0648116 0.67 404.82124 2.628 412.37363 9.831 454.88717 62.645 404.821 2.6285

163 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 14EG06b-15 738.07 21168.67 4.241 18.075168 0.93 0.5064707 1.11 0.066395 0.61 414.40005 2.45 416.07317 3.804 425.34041 20.801 414.4 2.4496 14EG06b-49 321.56 14250.09 1.471 18.371885 2.42 0.5082789 2.5 0.0677259 0.63 422.44014 2.592 417.29119 8.57 388.90355 54.378 422.44 2.5921 14EG06b-89 302.37 14587.83 1.763 18.252508 2.31 0.5235936 2.43 0.0693131 0.75 432.01626 3.121 427.54912 8.481 403.51837 51.789 432.016 3.1205 14EG06b-24 209.07 9932.28 1.449 18.719452 3.29 0.5144457 3.38 0.0698444 0.76 435.21796 3.207 421.43421 11.66 346.6819 74.485 435.218 3.2071 14EG06b-26 294.16 21025.09 1.203 18.321063 2.11 0.5274092 2.27 0.0700805 0.82 436.64059 3.446 430.08884 7.947 395.11753 47.422 436.641 3.4458 14EG06b-3 99.928 4068.318 1.164 19.411708 6.37 0.5017315 6.48 0.0706373 1.21 439.99384 5.15 412.87382 22 263.93244 146.34 439.994 5.1503 14EG06b-79 229.71 14947.8 1.039 18.288184 3.02 0.5445518 3.1 0.0722285 0.74 449.56765 3.206 441.42131 11.11 399.1442 67.591 449.568 3.2065 14EG06b-4 657.29 14071.94 1.756 18.105071 1.4 0.55137 1.49 0.0724006 0.5 450.60228 2.182 445.89372 5.379 421.65087 31.333 450.602 2.1819 14EG06b-35 101.04 3102.99 1.125 21.119032 7.81 0.4743756 7.9 0.0726599 1.18 452.16112 5.146 394.2068 25.8 66.92543 186.04 452.161 5.1461 14EG06b-50 123.85 12766.53 1.363 18.959242 5.49 0.5295358 5.58 0.072814 0.97 453.08702 4.265 431.50153 19.61 317.80912 124.93 453.087 4.2651 14EG06b-99 307.68 22905.42 1.15 17.332255 1.93 0.5945857 2.04 0.0747426 0.66 464.66522 2.976 473.79187 7.722 518.21226 42.34 464.665 2.9757 14EG06b-83 275 613.8269 0.919 20.18604 7.42 0.5566243 7.53 0.0814914 1.27 505.01886 6.173 449.32684 27.35 173.40614 173.45 505.019 6.1728 14EG06b-51 110.67 7811.594 0.936 17.352052 3.7 0.8111888 3.82 0.1020873 0.94 626.62938 5.63 603.12071 17.36 515.70514 81.276 626.629 5.6296 14EG06b-93 85.108 8656.876 0.586 16.174916 3.48 1.074812 3.73 0.1260879 1.34 765.50883 9.687 741.0982 19.6 668.01032 74.415 765.509 9.6866 14EG06b-42 206.03 13113.13 0.808 15.451847 1.55 1.1315509 1.65 0.1268099 0.55 769.641 3.977 768.49249 8.885 765.1357 32.735 769.641 3.9768 14EG06b-85 150.96 11800.29 1.116 15.274315 2.06 1.1586756 2.15 0.1283578 0.59 778.49037 4.355 781.33206 11.71 789.437 43.334 778.49 4.3549 14EG06b-20 269.96 18640.77 0.438 15.349116 1.2 1.160039 1.61 0.1291382 1.08 782.94716 7.96 781.97317 8.79 779.1739 25.162 782.947 7.9596 14EG06b-16 137.45 11494.27 1.069 15.713289 2.18 1.1341467 2.38 0.1292513 0.96 783.5931 7.064 769.72826 12.84 729.7224 46.156 783.593 7.064 14EG06b-96 422.94 33640.28 1.205 13.866652 0.56 1.2856968 0.86 0.1293031 0.66 783.88854 4.855 839.38764 4.937 989.18099 11.402 783.889 4.8549 14EG06b-59 30.849 2226.519 1.097 18.859023 10.2 0.9638214 10.4 0.1318301 1.99 798.2972 14.97 685.27417 51.87 329.84502 232.09 798.297 14.969 14EG06b-70 81.137 24135.98 1.179 15.118834 3.27 1.2055867 3.4 0.1321951 0.92 800.3761 6.927 803.16144 18.88 810.91299 68.516 800.376 6.9266 14EG06b-73 366.89 31510.77 1.697 14.469176 0.88 1.269835 1.81 0.1332569 1.58 806.41888 11.95 832.31673 10.26 902.0782 18.15 806.419 11.951 14EG06b-7 219.69 18031.03 0.744 15.334009 1.19 1.2118173 1.46 0.1347695 0.85 815.01715 6.483 806.02576 8.139 781.24567 25.075 815.017 6.4832 14EG06b-28 216 20941.74 1.038 14.746905 1.28 1.2968068 1.39 0.1386995 0.54 837.30421 4.228 844.31111 7.984 862.79791 26.633 837.304 4.2282 14EG06b-5 216.02 16749.78 1.426 14.426065 1.31 1.3982688 1.45 0.1462976 0.62 880.17592 5.109 888.20343 8.562 908.22768 26.923 880.176 5.1093 14EG06b-74 128.2 11285.19 1.33 14.306203 1.93 1.5648758 2 0.1623689 0.53 969.92822 4.802 956.3995 12.42 925.42647 39.703 925.426 39.703 14EG06b-17 381.67 33404.71 8.966 14.147116 0.76 1.3977915 0.99 0.1434198 0.64 863.97149 5.175 888.00133 5.869 948.36018 15.516 948.36 15.516 14EG06b-39 232.83 18276.34 0.506 13.887006 0.95 1.62237 1.17 0.163402 0.68 975.65471 6.18 978.90897 7.374 986.1978 19.417 986.198 19.417 14EG06b-76 248.78 27787.37 2.734 13.861148 0.92 1.5804961 1.04 0.1588881 0.47 950.59473 4.188 962.56452 6.462 989.98868 18.801 989.989 18.801 14EG06b-2 224.39 22212.64 2.335 13.528387 1.01 1.6513056 1.21 0.1620213 0.67 968.00015 6.061 990.0515 7.671 1039.2288 20.373 1039.23 20.373 14EG06b-22 58.94 6177.042 1.142 13.342256 3.55 1.8088007 3.64 0.1750325 0.8 1039.7796 7.653 1048.6445 23.77 1067.1751 71.329 1067.18 71.329 14EG06b-30 176.43 16400.4 1.427 13.312939 1.08 1.8879957 1.26 0.1822945 0.65 1079.4977 6.451 1076.8774 8.38 1071.5969 21.754 1071.6 21.754 14EG06b-82 256.29 37144.42 1.714 12.964142 0.57 2.0687454 0.75 0.1945134 0.48 1145.7787 5.049 1138.5174 5.11 1124.6943 11.396 1124.69 11.396 14EG06b-55 163.49 16427.57 1.193 12.938727 1.11 2.0344234 1.38 0.1909113 0.82 1126.3098 8.485 1127.0969 9.382 1128.6334 22.058 1128.63 22.058 14EG06b-29 117.52 16515.54 1.67 12.88008 1.32 2.058537 1.5 0.1922985 0.71 1133.8146 7.356 1135.134 10.25 1137.6772 26.315 1137.68 26.315 14EG06b-87 259.28 37436.07 2.273 12.845262 0.87 1.6646979 1.13 0.1550876 0.72 929.41946 6.273 995.16747 7.164 1143.0535 17.215 1143.05 17.215 14EG06b-25 149.37 17700.17 1.233 12.578733 1.11 2.2444137 1.26 0.2047569 0.6 1200.8239 6.538 1195.0395 8.848 1184.6108 21.934 1184.61 21.934 14EG06b-58 515.67 35552.66 2.74 12.521921 0.45 2.249509 0.76 0.2042948 0.62 1198.351 6.725 1196.6329 5.372 1193.5329 8.9428 1193.53 8.9428 14EG06b-62 167.93 26693.02 0.874 12.485412 0.87 2.2413749 1.01 0.2029626 0.53 1191.216 5.733 1194.088 7.118 1199.2932 17.073 1199.29 17.073 14EG06b-60 211.3 31784.38 3.324 12.424105 0.67 2.3734726 0.9 0.2138691 0.6 1249.398 6.766 1234.6476 6.4 1209.008 13.173 1209.01 13.173 14EG06b-19 238.34 23062.45 2.389 12.418255 0.94 2.3196535 1.81 0.2089212 1.55 1223.0675 17.22 1218.3179 12.82 1209.935 18.415 1209.93 18.415 14EG06b-57 135.08 26312.43 1.257 12.237343 1.04 2.3541799 1.26 0.2089419 0.71 1223.1781 7.903 1228.824 8.986 1238.7633 20.443 1238.76 20.443 14EG06b-64 204.44 29440.9 1.712 11.375231 0.73 2.668841 1.15 0.2201819 0.88 1282.8362 10.25 1319.8719 8.472 1380.5075 14.119 1380.51 14.119 14EG06b-13 237.04 34909.11 1.983 11.167699 0.54 2.5601401 1.05 0.2073606 0.9 1214.7405 10.01 1289.3333 7.676 1415.8031 10.259 1415.8 10.259 14EG06b-41 401.59 42055.54 1.462 11.100613 0.28 2.9484669 0.55 0.2373788 0.47 1373.0558 5.872 1394.4534 4.193 1427.3164 5.4143 1427.32 5.4143 14EG06b-88 199.03 2887.228 1.216 10.951608 1.04 2.8146084 1.28 0.2235603 0.75 1300.6598 8.787 1359.4334 9.56 1453.0743 19.696 1453.07 19.696 14EG06b-80 84.244 12568.04 0.883 10.718282 1.25 3.3852697 1.39 0.2631584 0.63 1505.9805 8.411 1500.9912 10.93 1493.9376 23.562 1493.94 23.562 14EG06b-75 175.13 29519.66 0.499 10.136578 0.63 3.8542986 1.14 0.283358 0.95 1608.2519 13.5 1604.1678 9.179 1598.7919 11.757 1598.79 11.757 14EG06b-34 105.51 15034.49 0.803 10.132189 0.99 3.7937066 1.16 0.2787827 0.59 1585.2286 8.341 1591.4139 9.286 1599.6001 18.504 1599.6 18.504 14EG06b-84 245.86 56660.44 1.024 9.3845068 0.29 4.5390683 0.8 0.308942 0.74 1735.4981 11.28 1738.1594 6.632 1741.3485 5.3614 1741.35 5.3614 14EG06b-95 129.38 28061.74 1.45 9.2473789 0.73 4.1848919 1.59 0.2806736 1.41 1594.754 19.91 1671.0656 13 1768.2781 13.274 1768.28 13.274 14EG06b-10 331.34 29341.04 0.973 9.0885854 0.29 4.7795454 0.86 0.3150515 0.81 1765.5172 12.58 1781.3119 7.262 1799.8518 5.2783 1799.85 5.2783 14EG06b-67 47.692 10661.07 9.41 8.9579604 1.46 5.0923435 1.62 0.3308457 0.7 1842.4795 11.27 1834.8305 13.74 1826.1465 26.444 1826.15 26.444 14EG06b-47 635.67 67464.29 13.52 8.8772946 0.12 4.9200923 0.97 0.3167762 0.96 1773.9662 14.94 1805.7085 8.2 1842.5364 2.2581 1842.54 2.2581 14EG06b-63 249.78 7001.543 3.748 8.7860038 0.33 4.7994669 0.8 0.3058321 0.72 1720.1643 10.94 1784.8058 6.709 1861.2219 6.0449 1861.22 6.0449 14EG06b-8 178.52 55086.48 4.79 8.6056465 0.37 5.4915114 0.65 0.3427474 0.54 1899.8729 8.867 1899.2693 5.617 1898.5928 6.6599 1898.59 6.6599 14EG06b-46 48.213 11116.58 10.76 8.547646 1.28 5.4243423 1.86 0.3362733 1.35 1868.7161 21.98 1888.7082 15.96 1910.7427 22.912 1910.74 22.912 14EG06b-72 227.29 32103.01 0.557 8.3502279 0.33 5.7979597 0.61 0.3511335 0.52 1940.0088 8.681 1946.106 5.301 1952.5859 5.8215 1952.59 5.8215 14EG06b-69 181.57 14663.48 1.091 8.2869408 0.69 5.7548274 1.41 0.3458799 1.23 1914.8942 20.44 1939.643 12.24 1966.1622 12.33 1966.16 12.33 14EG06b-78 184.77 37781.64 2.112 7.9991056 0.33 6.5483496 0.59 0.3799024 0.49 2075.8276 8.702 2052.4232 5.217 2028.9805 5.8833 2028.98 5.8833 14EG06b-61 316.13 48698.75 5.354 7.7681864 0.95 5.7137988 1.29 0.3219166 0.87 1799.0821 13.73 1933.4568 11.18 2080.6867 16.774 2080.69 16.774 14EG06b-37 296.14 65595.64 1.313 7.4809217 0.71 7.6286036 1.02 0.4139033 0.73 2232.7425 13.8 2188.2344 9.137 2146.7636 12.365 2146.76 12.365 14EG06b-66 221.04 25140.99 3.19 7.3997188 0.34 5.9202556 1.1 0.3177272 1.05 1778.6201 16.25 1964.2105 9.559 2165.8087 5.9752 2165.81 5.9752 14EG06b-21 179.17 33552.45 4.47 7.0279186 0.36 7.3223599 0.73 0.37323 0.63 2044.5809 11.1 2151.5417 6.498 2255.2448 6.1657 2255.24 6.1657 14EG06b-90 273.88 33658.58 2.517 6.2183782 0.36 9.0228412 1.66 0.4069295 1.62 2200.8681 30.29 2340.3225 15.2 2464.2215 6.0001 2464.22 6.0001 14EG06b-54 115.26 24753.62 1.072 6.1057325 0.34 10.716528 0.69 0.4745594 0.59 2503.5245 12.33 2498.8582 6.362 2495.0553 5.7448 2495.06 5.7448 14EG06b-36 116.75 20859.87 1.789 6.105535 0.3 8.3474048 0.83 0.3696357 0.77 2027.6861 13.4 2269.4814 7.484 2495.1098 4.9869 2495.11 4.9869 14EG06b-43 286.61 62450.87 2.75 5.995583 0.14 10.899922 0.58 0.4739729 0.57 2500.96 11.73 2514.6284 5.42 2525.6667 2.3219 2525.67 2.3219 14EG06b-1 265.35 56815.07 0.844 5.8876613 0.12 11.366977 0.69 0.4853852 0.68 2550.6794 14.24 2553.7186 6.411 2556.1168 2.028 2556.12 2.028 14EG05 14EG05-109 283.47 446.8181 1.364 28.612383 13 0.1596343 13.1 0.0331268 1.55 210.0879 3.196 150.38296 18.37 -712.60658 364.5 210.088 3.1964 14EG05-106 585.1 7019.219 1.056 20.044977 3.75 0.2302507 4.98 0.0334738 3.28 212.25311 6.84 210.4056 9.463 189.74756 87.272 212.253 6.8403 14EG05-94 383.68 3161.856 2.438 18.581051 6.84 0.2493339 6.91 0.0336009 0.97 213.04547 2.023 226.03494 14 363.43156 154.44 213.045 2.0232 14EG05-67 500.28 10308.63 1.608 20.336449 4.18 0.2306189 4.27 0.0340149 0.87 215.6271 1.848 210.70947 8.126 156.07667 97.882 215.627 1.8481 14EG05-162 188.88 4009.398 1.49 21.65009 8.46 0.2168888 8.62 0.0340562 1.67 215.88448 3.555 199.3171 15.6 7.5214987 203.83 215.884 3.5554 14EG05-2 680.55 19507.19 1.116 19.739713 2.04 0.2389283 2.14 0.0342064 0.64 216.82096 1.368 217.54249 4.191 225.336 47.209 216.821 1.3676 14EG05-182 207.78 499.4033 1.061 23.751623 26.2 0.2218466 26.2 0.038216 1.57 241.76512 3.728 203.4455 48.42 -220.38355 668.67 241.765 3.7277

164 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 14EG05-7 634.17 4690.824 2.287 18.547481 5.34 0.2875482 5.93 0.0386807 2.58 244.65015 6.204 256.62774 13.44 367.50704 120.3 244.65 6.2043 14EG05-6 380.17 18561.28 0.764 19.179264 3.46 0.2795155 3.7 0.0388809 1.31 245.89267 3.167 250.27315 8.199 291.56104 78.924 245.893 3.1666 14EG05-90 352.05 4980.872 0.933 20.896488 4.95 0.2611081 5.05 0.0395724 1.02 250.18198 2.505 235.55954 10.62 92.088788 117.3 250.182 2.5046 14EG05-199 568.91 2911.386 2.17 19.242933 4.6 0.2839988 4.66 0.0396357 0.76 250.57443 1.857 253.82471 10.47 283.94739 105.3 250.574 1.8574 14EG05-178 242.91 3503.899 0.566 20.849539 7.67 0.2649075 7.94 0.040058 2.02 253.19252 5.015 238.61397 16.88 97.406084 181.84 253.193 5.0147 14EG05-135 83.962 5688.27 1.403 16.373102 13.6 0.3421462 14.1 0.0406295 3.61 256.73369 9.086 298.79674 36.47 641.92473 293.91 256.734 9.0857 14EG05-69 104.25 1624.829 1.282 20.307837 11.2 0.2889277 11.5 0.0425551 2.45 268.65123 6.439 257.71501 26.14 159.374 263.13 268.651 6.4392 14EG05-14 436.34 3658.329 1.513 19.742011 5.54 0.297677 5.7 0.0426222 1.33 269.06589 3.495 264.58422 13.28 225.09741 128.23 269.066 3.4949 14EG05-163 371.63 8861.183 0.726 19.67063 3.21 0.3001041 3.98 0.0428143 2.35 270.25383 6.209 266.48155 9.327 233.47741 74.184 270.254 6.2094 14EG05-82 398.49 7000.353 1.745 19.234183 3.44 0.3081168 3.97 0.0429821 1.99 271.29114 5.277 272.72028 9.506 284.99573 78.729 271.291 5.2772 14EG05-172 397.53 8054.3 1.974 20.516329 4.58 0.2907721 4.65 0.0432664 0.85 273.04814 2.269 259.16694 10.64 135.44372 107.57 273.048 2.2694 14EG05-158 220.97 5879.081 1.469 20.874243 6.37 0.2870996 6.56 0.0434652 1.56 274.27644 4.176 256.27387 14.85 94.643829 150.97 274.276 4.1757 14EG05-157 160.07 1185.846 1.646 15.369686 17.5 0.394832 17.6 0.0440125 2.2 277.65653 5.969 337.89308 50.69 776.35802 370.36 277.657 5.9689 14EG05-177 590.68 11691.23 15.87 19.988062 2.36 0.32129 2.6 0.0465765 1.09 293.46876 3.125 282.89441 6.424 196.40342 54.932 293.469 3.1246 14EG05-85 302.78 13211.2 1.282 20.710436 4.2 0.3135467 4.32 0.0470967 1 296.67208 2.887 276.92631 10.47 113.25995 99.25 296.672 2.8867 14EG05-8 162.02 3264.602 1.694 21.541363 7.66 0.3032144 7.77 0.047372 1.35 298.36695 3.945 268.90779 18.37 19.612928 184.05 298.367 3.9449 14EG05-197 75.194 2022.846 0.978 18.592796 13.3 0.3525848 13.6 0.0475452 2.78 299.43308 8.141 306.66338 36.02 362.00611 301.5 299.433 8.1408 14EG05-84 186.36 11664.03 1.184 20.751077 6.09 0.3223832 6.25 0.048519 1.39 305.42262 4.145 283.73414 15.47 108.59699 144.03 305.423 4.1451 14EG05-81 94.246 653.6071 0.54 25.479807 15.7 0.2652445 15.9 0.0490164 2.48 308.47991 7.466 238.88449 33.92 -400.26892 412.42 308.48 7.4658 14EG05-195 236.72 4283.416 1.342 21.622117 6.8 0.3125719 7 0.049017 1.66 308.48379 5.01 276.17249 16.92 10.639686 163.61 308.484 5.0099 14EG05-196 376.82 8759.433 1.424 21.086298 4.66 0.3220445 4.82 0.049251 1.2 309.92144 3.639 283.47403 11.91 70.62267 110.93 309.921 3.6392 14EG05-27 62.316 3177.853 1.523 16.373201 12.8 0.4262255 13.2 0.0506141 3.31 318.29086 10.29 360.49288 40.15 641.91189 276.26 318.291 10.293 14EG05-48 319.06 7938.339 2.075 19.634173 4.31 0.3608675 4.41 0.0513877 0.95 323.03563 2.983 312.86222 11.88 237.72631 99.419 323.036 2.9828 14EG05-137 624.1 6118.601 0.857 18.842846 2.2 0.3821426 2.39 0.0522241 0.93 328.16169 2.972 328.6134 6.709 331.81265 49.913 328.162 2.9724 14EG05-60 350.07 19668.88 0.693 19.124829 3.53 0.3939526 3.68 0.0546437 1.04 342.96855 3.481 337.25266 10.56 298.02416 80.503 342.969 3.4815 14EG05-129 530.13 2041.143 2.243 17.019802 3.27 0.4619199 4.33 0.057019 2.83 357.47122 9.851 385.59231 13.89 558.04834 71.411 357.471 9.8512 14EG05-145 324.51 474.9888 0.92 23.313941 10.5 0.3384655 10.6 0.0572307 1.16 358.76173 4.041 296.00833 27.13 -173.80767 262.33 358.762 4.0411 14EG05-80 277.77 4919.614 0.646 19.242974 4.66 0.4179185 4.73 0.058326 0.79 365.43727 2.819 354.56156 14.15 283.94599 106.69 365.437 2.8188 14EG05-97 449.05 714.0655 1.411 19.747421 10.5 0.4095331 10.6 0.0586541 1.35 367.43496 4.832 348.53887 31.22 224.45193 243.16 367.435 4.8318 14EG05-28 180.4 12737.84 20.61 18.747582 5.68 0.4360401 5.86 0.0592885 1.45 371.29702 5.215 367.45635 18.07 343.2898 128.65 371.297 5.2149 14EG05-128 642.92 14659.78 5.971 17.380452 1.83 0.4825726 2.21 0.0608307 1.23 380.67515 4.565 399.83635 7.299 512.15263 40.246 380.675 4.5652 14EG05-89 217.99 2243.999 0.754 17.080843 6.65 0.4989825 6.8 0.0618149 1.43 386.65356 5.375 411.01337 22.98 550.22441 145.25 386.654 5.3753 14EG05-133 245.2 7373.071 1.4 19.562305 4.48 0.4475484 4.68 0.0634978 1.33 396.86255 5.109 375.56114 14.68 246.18366 103.28 396.863 5.1091 14EG05-18 281.85 3465.521 1.208 18.224373 4.15 0.4865678 4.5 0.0643124 1.73 401.79825 6.739 402.56891 14.96 406.9723 93.012 401.798 6.7393 14EG05-149 179.45 8418.335 0.592 18.723778 6.21 0.4783419 6.3 0.0649577 1.08 405.70554 4.249 396.93465 20.71 346.14906 140.58 405.706 4.2495 14EG05-64 486.44 26737.11 1.741 18.162621 1.8 0.4952725 1.9 0.0652411 0.61 407.421 2.414 408.49719 6.387 414.56247 40.184 407.421 2.4145 14EG05-75 57.619 1904.639 1.055 19.728793 11.4 0.4635715 11.6 0.0663309 2.45 414.01255 9.825 386.73875 37.41 226.62787 263.37 414.013 9.8252 14EG05-115 213.23 4675.213 0.522 19.336586 5.13 0.4748372 5.29 0.0665922 1.31 415.59187 5.252 394.52465 17.3 272.82691 117.53 415.592 5.2524 14EG05-65 205.16 5449.414 1.159 19.940723 5.26 0.4616371 5.34 0.0667637 0.92 416.62836 3.704 385.39586 17.12 201.91001 122.15 416.628 3.7035 14EG05-2 284.41 1072.974 0.865 19.226044 8.56 0.4798287 8.75 0.0669075 1.8 417.49742 7.279 397.95536 28.81 285.9628 196.06 417.497 7.2788 14EG05-23 297.36 5799.739 1.554 18.907046 4.04 0.4930306 4.11 0.0676077 0.8 421.72677 3.258 406.97365 13.8 324.11182 91.663 421.727 3.2583 14EG05-102 116.57 3712.635 0.65 19.872616 6.86 0.4713288 7.01 0.0679325 1.45 423.68772 5.943 392.10635 22.8 209.84701 159.1 423.688 5.9433 14EG05-21 63.148 1538.731 1.959 22.312978 13.8 0.4221137 14.2 0.0683102 3.38 425.96722 13.92 357.56132 42.85 -65.56973 338.24 425.967 13.917 14EG05-112 311.11 4620.313 0.98 19.437163 3.75 0.4866902 3.93 0.0686095 1.16 427.77284 4.789 402.65249 13.06 260.94111 86.236 427.773 4.7888 14EG05-4 487.92 14113.52 1.676 18.055694 2.07 0.5279705 2.2 0.0691389 0.75 430.96585 3.144 430.46191 7.728 427.74404 46.168 430.966 3.1443 14EG05-174 90.222 3419.754 1.648 20.833333 8.05 0.4583841 8.62 0.0692607 3.07 431.70022 12.81 383.13352 27.5 99.272171 190.72 431.7 12.807 14EG05-47 208.42 4909.462 1.744 18.719981 4.55 0.5107141 4.67 0.0693397 1.03 432.17637 4.306 418.92924 16.03 346.64268 103.04 432.176 4.3062 14EG05-169 185.33 3620.833 0.944 19.546445 6.09 0.4893577 6.22 0.0693734 1.23 432.37948 5.148 404.47274 20.74 248.05254 140.37 432.379 5.1481 14EG05-50 255.03 761.7457 0.947 17.043497 15.8 0.5631854 15.8 0.069616 1.16 433.84157 4.878 453.5977 57.9 554.97831 345.96 433.842 4.8779 14EG05-62 100.66 3795.956 1.228 18.610057 8.48 0.5169977 8.62 0.0697807 1.56 434.83403 6.561 423.14379 29.85 359.9121 191.68 434.834 6.561 14EG05-30 268.85 11954.2 2.834 18.285227 3.31 0.5276967 3.44 0.0699815 0.96 436.04442 4.063 430.27992 12.08 399.50812 74.112 436.044 4.0625 14EG05-88 85.811 3299.487 0.953 22.818513 9.4 0.4230219 9.56 0.0700082 1.73 436.20511 7.284 358.2096 28.86 -120.54452 232.33 436.205 7.2838 14EG05-13 151.64 667.3588 2.276 20.714441 17.1 0.4661407 17.1 0.0700308 1.1 436.34112 4.623 388.51966 55.34 112.77698 405.85 436.341 4.6228 14EG05-138 505.24 9909.049 1.559 18.584523 2.29 0.5224049 2.46 0.0704137 0.9 438.64782 3.814 426.75662 8.585 363.00984 51.729 438.648 3.814 14EG05-173 489.58 18655.53 2.453 17.635521 1.98 0.5525518 2.32 0.0706741 1.22 440.21535 5.18 446.66689 8.396 480.00809 43.735 440.215 5.1796 14EG05-10 142.5 25923.02 1.801 18.160716 4.82 0.5406789 4.97 0.0712149 1.21 443.47117 5.176 438.87209 17.72 414.79681 107.82 443.471 5.1758 14EG05-1 215.32 4160.034 1.073 19.234193 4.95 0.5138102 5.03 0.0716763 0.9 446.24678 3.871 421.00805 17.34 284.99503 113.25 446.247 3.8708 14EG05-151 128.37 1124.29 0.854 17.474298 16 0.5670542 16.1 0.0718659 1.72 447.38751 7.439 456.10759 59.32 500.30977 355.11 447.388 7.4395 14EG05-16 177.72 11270.43 2.387 18.42924 4.38 0.5392354 4.51 0.072075 1.09 448.64469 4.744 437.9203 16.05 381.90106 98.413 448.645 4.7444 14EG05-25 76.324 1590.95 1.681 22.276543 11.4 0.4471868 11.7 0.0722496 2.55 449.6946 11.08 375.30742 36.62 -61.582848 278.37 449.695 11.079 14EG05-147 399.28 8296.723 4.207 18.010734 2.01 0.5539327 2.25 0.0723581 1 450.34683 4.343 447.56962 8.135 433.30128 44.861 450.347 4.3429 14EG05-53 210.49 4454.18 1.178 18.338793 4.56 0.5461755 4.74 0.0726443 1.26 452.06725 5.517 442.48817 16.99 392.94911 102.45 452.067 5.5171 14EG05-31 155.46 7138.24 1.089 18.499557 5.34 0.5433633 5.48 0.0729038 1.22 453.62667 5.357 440.63971 19.59 373.33414 120.29 453.627 5.3568 14EG05-56 181.56 1679.104 3.206 19.879616 5.01 0.5093944 5.15 0.0734448 1.21 456.876 5.353 418.04184 17.66 209.01381 116.15 456.876 5.353 14EG05-57 463.28 11944.25 1.422 17.723156 1.93 0.5740309 2.16 0.0737862 0.97 458.92597 4.28 460.61813 8.001 469.05545 42.797 458.926 4.2798 14EG05-40 245.38 22767.48 1.368 18.329977 3.77 0.5596287 3.91 0.0743979 1.05 462.59724 4.671 451.28472 14.25 394.02722 84.557 462.597 4.671 14EG05-154 292.24 8202.874 1.395 17.767306 4.54 0.5781609 4.65 0.0745022 1.02 463.22301 4.569 463.27884 17.3 463.57762 100.6 463.223 4.5686 14EG05-37 277 7370.655 1.353 18.221079 3.36 0.564066 3.46 0.0745423 0.82 463.4636 3.653 454.16949 12.68 407.37668 75.323 463.464 3.653 14EG05-11 225.16 20693.79 1.595 18.53854 3.1 0.5559666 3.31 0.074752 1.14 464.72175 5.112 448.89778 12 368.59331 69.965 464.722 5.1121 14EG05-66 186.28 8042.589 0.763 17.96902 4.35 0.5817245 4.56 0.0758124 1.36 471.079 6.188 465.56906 17.02 438.46345 96.81 471.079 6.1881 14EG05-113 484.01 15415.71 1.178 17.766984 1.77 0.5900703 1.98 0.0760355 0.87 472.4153 3.973 470.91258 7.448 463.6171 39.304 472.415 3.9732 14EG05-49 371.77 9225.545 2.257 18.085691 2.78 0.5811961 3.33 0.0762354 1.83 473.61284 8.343 465.22985 12.43 424.04213 62.145 473.613 8.3425 14EG05-78 372.67 8804.332 0.955 16.843715 2.86 0.6268171 2.98 0.0765733 0.84 475.63666 3.866 494.11118 11.66 580.66084 62.096 475.637 3.8661 14EG05-114 848.1 23843.62 2.058 17.439132 0.96 0.6268902 1.14 0.0792894 0.63 491.87976 2.964 494.15679 4.475 504.72004 21.041 491.88 2.964 14EG05-9 315.77 47750.94 1.278 17.249499 1.46 0.6484075 1.63 0.0811191 0.73 502.79924 3.55 507.49829 6.52 528.75118 31.948 502.799 3.5504 14EG05-142 361.6 1050.461 0.627 18.125411 4.38 0.7064094 4.55 0.0928631 1.23 572.44755 6.752 542.61196 19.11 419.14454 97.724 572.448 6.7521 14EG05-117 254.15 427.5496 0.555 17.006828 12 0.8559247 12.2 0.1055742 1.69 646.99303 10.4 627.89568 57.01 559.67544 263.37 646.993 10.402

165 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 14EG05-150 93.411 2982.112 0.901 16.775104 5.89 0.902501 6.15 0.1098024 1.78 671.59997 11.35 653.06327 29.64 589.5465 127.82 671.6 11.351 14EG05-164 79.627 319.5917 0.435 20.928914 17 0.7354386 17.2 0.1116328 2.01 682.2236 13.01 559.74025 73.94 88.451722 406.33 682.224 13.014 14EG05-180 250.45 2363.586 0.796 15.712973 3.01 1.064114 3.38 0.1212677 1.52 737.85619 10.6 735.84917 17.68 729.76493 63.889 737.856 10.602 14EG05-68 294.63 12238.47 1.123 15.822507 1.55 1.0641229 2.06 0.1221141 1.36 742.72036 9.559 735.85359 10.79 714.98455 32.85 742.72 9.5591 14EG05-100 72.423 806.4716 0.744 18.962856 10.7 0.8988076 10.8 0.1236144 1.48 751.33387 10.5 651.09012 52.17 317.37537 244.91 751.334 10.503 14EG05-126 112.76 1643.948 1.787 16.12785 5.15 1.0914461 5.24 0.1276667 0.94 774.54052 6.894 749.20623 27.75 674.2484 110.17 774.541 6.8938 14EG05-152 816.71 2689.081 9.542 14.548984 1.21 1.2153576 1.44 0.1282435 0.78 777.83739 5.739 807.64972 8.038 890.76568 25.032 777.837 5.7392 14EG05-181 87.597 2038.581 0.93 14.653661 8.79 1.2378299 8.94 0.1315545 1.6 796.72772 12.03 817.89775 50.23 875.9057 182.32 796.728 12.028 14EG05-153 165.25 2312.969 0.647 15.305847 3.82 1.1948481 3.98 0.1326383 1.12 802.89863 8.489 798.20568 22 785.10753 80.208 802.899 8.4894 14EG05-132 251.31 12639.82 1.774 14.950673 1.56 1.2398336 1.86 0.1344382 1.01 813.13517 7.732 818.80648 10.47 834.23863 32.623 813.135 7.7321 14EG05-166 274.89 24267.31 1.581 14.921256 1.37 1.2493054 1.55 0.1351988 0.72 817.45532 5.558 823.09129 8.757 838.32933 28.626 817.455 5.5584 14EG05-36 397.02 19151.3 5.825 14.554687 1.18 1.2862035 1.85 0.1357723 1.42 820.71162 10.96 839.6127 10.55 889.91821 24.303 820.712 10.965 14EG05-83 502.84 29136.26 7.127 14.699223 0.67 1.3462381 1.06 0.1435208 0.82 864.54127 6.653 865.93211 6.166 869.49134 13.819 864.541 6.6532 14EG05-175 198.6 11915.38 1.346 14.731733 1.78 1.4077294 2.16 0.1504083 1.21 903.25157 10.23 892.20098 12.81 864.9335 36.992 903.252 10.232 14EG05-148 536.32 10518.79 4.542 14.42597 0.92 1.4928258 1.46 0.1561899 1.14 935.56817 9.93 927.46807 8.905 908.24113 18.922 908.241 18.922 14EG05-120 237.75 921.6277 2.43 14.365969 5.84 1.5035177 5.95 0.1566543 1.09 938.15683 9.541 931.81382 36.27 916.85989 120.31 916.86 120.31 14EG05-160 392.34 21219.27 0.908 14.293077 1.11 1.4675497 1.36 0.1521308 0.79 912.89691 6.712 917.12 8.23 927.31551 22.826 927.316 22.826 14EG05-41 239.17 14428.58 2.812 14.262968 1.4 1.4965942 1.61 0.1548149 0.8 927.89719 6.925 929.00188 9.799 931.64449 28.677 931.644 28.677 14EG05-76 255.23 17084.78 0.972 14.149712 1.08 1.5412534 1.25 0.1581686 0.62 946.59144 5.467 947.00453 7.678 947.94533 22.146 947.945 22.146 14EG05-32 517.94 27052.95 3.562 14.14618 0.7 1.5285935 1.27 0.1568303 1.05 939.1378 9.196 941.93352 7.767 948.49442 14.392 948.494 14.392 14EG05-134 363.03 20597.67 8.656 14.041242 0.86 1.5926464 1.27 0.1621898 0.93 968.93479 8.376 967.33426 7.905 963.71942 17.559 963.719 17.559 14EG05-127 438.19 4515.715 0.568 13.895099 0.97 1.6593834 1.22 0.1672273 0.74 996.81598 6.802 993.14036 7.73 985.05035 19.778 985.05 19.778 14EG05-179 340.56 11793.49 2.781 13.847345 2.4 1.4030956 3.01 0.1409135 1.83 849.82575 14.55 890.24493 17.87 992.0416 48.717 992.042 48.717 14EG05-38 172.66 16274.89 1.541 13.787434 1.4 1.6983981 1.68 0.1698328 0.93 1011.1901 8.731 1007.9284 10.75 1000.8264 28.426 1000.83 28.426 14EG05-59 169.29 6498.21 0.832 13.629073 2.1 1.7180753 2.36 0.1698272 1.07 1011.159 10.02 1015.3059 15.14 1024.2424 42.534 1024.24 42.534 14EG05-187 143.69 36622.88 1.148 13.143831 2.11 1.7906848 2.59 0.1707025 1.51 1015.9805 14.15 1042.0744 16.9 1097.2143 42.252 1097.21 42.252 14EG05-44 178.85 11800.62 1.862 13.09334 1.4 1.9657425 1.56 0.1866705 0.69 1103.3136 6.962 1103.8508 10.49 1104.892 27.968 1104.89 27.968 14EG05-1 542.88 25395.76 2.36 12.922358 2.62 1.9537675 5.16 0.1831105 4.45 1083.9454 44.38 1099.7426 34.69 1131.1548 52.253 1131.15 52.253 14EG05-73 170.26 14948.02 1.491 12.861923 1.24 2.0688279 1.48 0.1929874 0.82 1137.5381 8.547 1138.5447 10.15 1140.4676 24.559 1140.47 24.559 14EG05-185 234.86 30718.92 6.649 12.794151 0.78 2.1599215 1.98 0.2004233 1.82 1177.5937 19.62 1168.2461 13.76 1150.9464 15.484 1150.95 15.484 14EG05-6 299.92 19252.81 2.855 12.248109 0.96 2.3935231 1.26 0.2126206 0.82 1242.7644 9.269 1240.6647 9.057 1237.0376 18.897 1237.04 18.897 14EG05-77 410.22 4539.256 8.051 12.110746 1.79 2.3407137 1.85 0.2055975 0.44 1205.3204 4.875 1224.7393 13.13 1259.1202 35.017 1259.12 35.017 14EG05-99 175.7 9980.892 3.485 11.528925 1 2.6837219 1.32 0.2244011 0.86 1305.0886 10.15 1323.982 9.729 1354.6705 19.212 1354.67 19.212 14EG05-111 769.13 52906.44 3.712 11.27209 0.28 2.8019368 1 0.2290665 0.97 1329.6046 11.6 1356.0549 7.517 1397.9889 5.3017 1397.99 5.3017 14EG05-176 355.83 13815 1.005 11.056269 0.85 2.955037 1.6 0.2369574 1.35 1370.8599 16.71 1396.1415 12.1 1434.955 16.123 1434.96 16.123 14EG05-110 219.2 26721.76 1.323 10.708382 0.73 3.3115503 1.64 0.2571899 1.47 1475.4489 19.37 1483.7767 12.81 1495.6859 13.887 1495.69 13.887 14EG05-156 138.27 3106.721 0.537 10.561291 1.36 3.522497 1.61 0.2698152 0.86 1539.8637 11.71 1532.2783 12.72 1521.8043 25.676 1521.8 25.676 14EG05-198 185.12 32785.16 1.342 10.120022 0.81 3.6602152 1.26 0.26865 0.97 1533.9457 13.25 1562.7371 10.08 1601.842 15.086 1601.84 15.086 14EG05-167 114.77 33522.44 1.289 10.035199 1.27 3.9042482 1.62 0.2841595 1 1612.2765 14.33 1614.5624 13.06 1617.529 23.552 1617.53 23.552 14EG05-87 552.1 1419.539 1.398 10.002054 2.21 3.9098758 2.34 0.2836292 0.75 1609.6138 10.68 1615.7269 18.88 1623.6828 41.144 1623.68 41.144 14EG05-131 168.54 24588.41 0.721 9.7438815 0.69 4.276967 1.25 0.3022502 1.04 1702.4574 15.58 1688.9389 10.28 1672.1779 12.768 1672.18 12.768 14EG05-29 386.93 43503.86 1.019 9.6909047 0.36 4.3071992 1.12 0.3027318 1.06 1704.8408 15.82 1694.7395 9.194 1682.2508 6.6558 1682.25 6.6558 14EG05-71 37.146 12924.21 1.13 9.5297492 2.34 4.517481 2.57 0.3122314 1.04 1751.6778 16.01 1734.1945 21.34 1713.1507 43.123 1713.15 43.123 14EG05-34 166.14 17534.79 1.367 9.3986366 0.74 3.7509019 2.79 0.2556815 2.69 1467.7096 35.32 1582.3064 22.37 1738.5906 13.484 1738.59 13.484 14EG05-122 263.52 14983.9 1.958 9.3970307 0.48 4.375537 0.93 0.298209 0.8 1682.4214 11.8 1707.7306 7.692 1738.9039 8.816 1738.9 8.816 14EG05-123 115.71 19190.68 0.63 9.2309157 1.39 4.0054713 1.93 0.2681619 1.34 1531.4653 18.21 1635.3065 15.65 1771.5323 25.319 1771.53 25.319 14EG05-190 70.43 12978.36 1.154 9.1215834 1.94 4.6773721 2.32 0.309436 1.27 1737.9309 19.39 1763.201 19.41 1793.2549 35.313 1793.25 35.313 14EG05-104 102.65 613.3048 0.565 8.9929612 2.31 4.7206652 2.73 0.3078964 1.47 1730.3469 22.24 1770.9144 22.89 1819.0707 41.851 1819.07 41.851 14EG05-96 393.56 4929.54 3.651 8.9384436 0.5 4.4270935 1.18 0.2869983 1.07 1626.5116 15.42 1717.4227 9.794 1830.1014 9.0248 1830.1 9.0248 14EG05-171 249.07 14004.45 2.465 8.8703449 0.7 5.0910872 1.21 0.327529 0.99 1826.3937 15.67 1834.6211 10.24 1843.9538 12.621 1843.95 12.621 14EG05-183 164.61 1943.415 3.521 8.7514649 0.86 5.4565156 1.18 0.3463338 0.8 1917.0681 13.26 1893.7806 10.1 1868.3325 15.58 1868.33 15.58 14EG05-98 566.01 4340.006 1.112 8.6865059 0.82 5.1929329 1.46 0.3271573 1.2 1824.5882 19.15 1851.4584 12.42 1881.7653 14.822 1881.77 14.822 14EG05-9 185.13 2209.317 2.203 8.6309457 1.41 5.6085522 1.51 0.3510814 0.53 1939.7605 8.903 1917.4134 13.01 1893.3133 25.426 1893.31 25.426 14EG05-19 612.32 73810.3 15.45 8.597335 0.2 4.5274194 0.66 0.2823016 0.63 1602.9432 8.877 1736.0218 5.452 1900.3299 3.5271 1900.33 3.5271 14EG05-24 184.63 29295.25 1.866 8.5657977 0.54 5.3859615 1.1 0.334603 0.96 1860.6533 15.53 1882.6238 9.428 1906.9333 9.6463 1906.93 9.6463 14EG05-159 523.52 51092.62 8.521 8.5549073 0.25 5.5066215 0.86 0.341664 0.82 1894.6698 13.48 1901.63 7.379 1909.218 4.5079 1909.22 4.5079 14EG05-124 164.53 37939.46 2.176 8.5358199 0.49 5.4839677 0.89 0.3394993 0.74 1884.2602 12.1 1898.0887 7.65 1913.2279 8.8786 1913.23 8.8786 14EG05-155 261.17 4947.756 1.834 8.5258142 0.68 5.7426357 1.29 0.3550961 1.1 1958.887 18.6 1937.8087 11.2 1915.3327 12.207 1915.33 12.207 14EG05-121 342.87 38720.36 6.184 8.4472898 0.3 5.5569554 0.79 0.3404498 0.74 1888.8329 12.04 1909.4546 6.824 1931.9151 5.3175 1931.92 5.3175 14EG05-20 317.14 40102.09 6.596 8.3921003 0.29 5.9022007 1.25 0.3592389 1.22 1978.5651 20.78 1961.5579 10.9 1943.6454 5.2713 1943.65 5.2713 14EG05-193 275.07 35266.47 5.25 8.2993985 0.46 5.8959607 0.86 0.354895 0.73 1957.9306 12.24 1960.6395 7.435 1963.4825 8.1307 1963.48 8.1307 14EG05-103 197.63 19916.64 10.41 8.0276244 0.54 5.7353248 1.16 0.333921 1.03 1857.3586 16.57 1936.7071 10.01 2022.6766 9.4865 2022.68 9.4865 14EG05-170 235.05 28210.21 4.612 7.8345433 0.64 6.7176707 1.35 0.3817079 1.18 2084.2567 21.1 2074.9481 11.9 2065.7059 11.279 2065.71 11.279 14EG05-136 124.74 24335.03 1.193 7.2476431 0.66 8.0383019 1.89 0.4225322 1.77 2271.9648 33.92 2235.3367 17.09 2201.9389 11.539 2201.94 11.539 14EG05-168 457.45 21182.51 3.342 6.8200065 0.29 6.8030739 2.4 0.3365028 2.38 1869.8235 38.62 2086.1225 21.22 2306.9446 4.978 2306.94 4.978 14EG05-107 139.85 5402.322 1.267 6.7568505 0.98 7.7410493 1.84 0.3793524 1.56 2073.2579 27.59 2201.3812 16.54 2322.9075 16.799 2322.91 16.799 14EG05-79 427.59 16088.98 7.905 6.568308 0.77 8.4172481 1.33 0.4009797 1.09 2173.5488 20.15 2277.0401 12.1 2371.2959 13.058 2371.3 13.058 14EG05-39 138.41 18203.72 1.133 6.5444574 0.56 8.8466598 1.19 0.4199056 1.04 2260.051 19.91 2322.3154 10.82 2377.4987 9.5663 2377.5 9.5663 14EG05-70 189.88 35136.37 1.468 6.5443736 0.27 9.0005857 0.84 0.4272062 0.79 2293.111 15.24 2338.0653 7.632 2377.5205 4.6352 2377.52 4.6352 14EG05-125 88.893 22173.6 1.636 6.2343672 1.05 8.770378 2.2 0.3965605 1.93 2153.1823 35.34 2314.4186 20.04 2459.8819 17.763 2459.88 17.763 14EG05-189 202.25 36510.02 0.927 6.0818929 0.23 10.819214 0.93 0.477236 0.9 2515.2154 18.84 2507.7185 8.669 2501.6425 3.8183 2501.64 3.8183 14EG05-140 53.537 13158.83 0.475 6.0756133 0.83 10.831979 1.46 0.4773057 1.21 2515.5197 25.1 2508.8145 13.6 2503.3811 13.956 2503.38 13.956 14EG05-93 50.834 10385.07 1.651 5.9899818 1.03 10.783131 1.35 0.4684563 0.86 2476.7879 17.78 2504.6138 12.5 2527.2361 17.305 2527.24 17.305 14EG05-3 173.78 33749.95 0.866 5.8595288 0.23 11.199345 0.66 0.475942 0.62 2509.5661 12.93 2539.8612 6.166 2564.1328 3.7652 2564.13 3.7652 14EG05-194 171.91 13019.46 1.004 5.6821835 0.99 12.254028 1.67 0.5050017 1.35 2635.2556 29.15 2624.0559 15.69 2615.4134 16.466 2615.41 16.466 14EG05-4 674.76 56227.79 4.125 5.6770067 0.76 9.330269 4.2 0.3841601 4.13 2095.6877 73.83 2370.999 38.49 2616.9305 12.575 2616.93 12.575 14EG05-5 447.38 59776.23 1.46 5.6423796 0.11 12.375117 0.59 0.5064194 0.57 2641.3254 12.45 2633.2904 5.5 2627.1085 1.8785 2627.11 1.8785

166 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 14EG05-55 232.21 40102.32 1.302 4.7231939 0.47 14.200363 1.12 0.4864452 1.02 2555.278 21.52 2763.1815 10.66 2918.7556 7.6434 2918.76 7.6434 14EG05-101 135.39 43194.02 0.981 4.5906228 0.2 17.224117 0.75 0.5734655 0.72 2922.0339 16.96 2947.3989 7.188 2964.7485 3.2123 2964.75 3.2123 14WG15 14WG15-85 711.79 14817.39 1.631 20.34128 2.31 0.2160671 2.41 0.0318761 0.7 202.27971 1.395 198.63125 4.355 155.54131 54.068 202.28 1.3953 14WG15-184 328.77 8927.56 0.994 21.265364 4.51 0.2170807 4.61 0.0334806 0.98 212.29519 2.037 199.47719 8.358 50.503723 107.73 212.295 2.0374 14WG15-35 267.94 4282.761 1.279 21.574707 5.41 0.214485 5.5 0.0335614 1.03 212.79963 2.153 197.30934 9.867 15.883897 129.96 212.8 2.1532 14WG15-161 399.21 8314.372 0.795 20.455474 3.94 0.227721 4.07 0.033784 1.03 214.1878 2.18 208.31561 7.665 142.40456 92.426 214.188 2.1797 14WG15-146 136.12 1999.959 1.094 23.06568 9.67 0.2023097 9.83 0.033844 1.77 214.56173 3.732 187.07867 16.8 -147.19133 240.31 214.562 3.7321 14WG15-70 129.24 9687.554 1.058 20.840428 7.21 0.2240129 7.45 0.0338593 1.88 214.65732 3.973 205.24413 13.85 98.465342 170.75 214.657 3.9733 14WG15-25 457.35 23508.16 1.001 19.968757 2.74 0.2344288 2.81 0.0339516 0.62 215.2329 1.319 213.84817 5.413 198.64511 63.575 215.233 1.3193 14WG15-44 596.93 17375 2.42 20.375532 2.54 0.2307966 2.62 0.0341065 0.63 216.19832 1.346 210.85608 4.99 151.57092 59.595 216.198 1.3461 14WG15-72 442.14 7327.433 0.939 20.374872 3.59 0.2308596 3.72 0.0341147 0.97 216.24944 2.057 210.90802 7.086 151.67057 84.202 216.249 2.057 14WG15-133 361.09 7043.554 1.229 21.413585 4.5 0.2196841 4.57 0.0341183 0.82 216.2716 1.753 201.64685 8.366 33.881371 107.81 216.272 1.7528 14WG15-159 179.23 5367.129 0.893 21.642205 6.9 0.2174868 7.01 0.0341376 1.21 216.39225 2.572 199.81592 12.71 8.3596106 166.25 216.392 2.5719 14WG15-59 344.43 7610.783 1.325 21.043516 4.35 0.223824 4.43 0.0341605 0.81 216.53472 1.728 205.08747 8.224 75.443979 103.47 216.535 1.7282 14WG15-144 259.78 4570.136 1.394 21.667429 5.76 0.2175482 5.89 0.034187 1.2 216.7004 2.566 199.86711 10.68 5.567162 138.87 216.7 2.5665 14WG15-158 384.54 6047.395 2.047 21.481673 4.5 0.219575 4.57 0.0342097 0.77 216.84188 1.652 201.55602 8.347 26.251224 107.96 216.842 1.652 14WG15-69 619.13 12116.21 1.774 19.614795 2.31 0.2404986 2.35 0.0342133 0.42 216.86416 0.896 218.82868 4.628 240.02495 53.351 216.864 0.8963 14WG15-38 245.05 2521.042 1.113 20.589163 6.14 0.2294066 6.2 0.0342565 0.89 217.13356 1.903 209.70874 11.75 127.11189 144.54 217.134 1.9029 14WG15-13 332.79 17543.03 1.306 20.058402 3.4 0.2355833 3.47 0.034272 0.7 217.22999 1.497 214.79733 6.713 188.18929 79.035 217.23 1.4974 14WG15-1 635.6 14152.89 1.092 19.83277 2.48 0.2387349 2.55 0.0343398 0.59 217.65263 1.257 217.38396 4.982 214.49827 57.373 217.653 1.2574 14WG15-67 314.4 7106.13 1.452 22.083947 5.15 0.2151182 5.24 0.034455 0.98 218.37066 2.096 197.83864 9.416 -40.446909 125.07 218.371 2.0964 14WG15-12 154.79 1829.374 1.788 23.391388 11 0.2031478 11.1 0.0344641 1.91 218.42717 4.111 187.78629 19.1 -182.08178 274.66 218.427 4.1111 14WG15-105 231.83 8925.642 2.135 21.870031 5.81 0.21761 5.96 0.0345165 1.35 218.75382 2.91 199.91869 10.82 -16.855769 140.5 218.754 2.9096 14WG15-79 202.74 8411.817 1.264 22.071836 5.78 0.2161061 5.92 0.0345943 1.27 219.23827 2.743 198.66376 10.68 -39.115426 140.44 219.238 2.7435 14WG15-100 313.45 3939.646 1.363 20.807766 5.02 0.2305752 5.14 0.0347966 1.08 220.49885 2.34 210.6734 9.776 102.16082 118.84 220.499 2.3401 14WG15-200 237.73 5967.873 1.537 21.657348 6.08 0.2227586 6.26 0.0349896 1.51 221.7008 3.294 204.20312 11.58 6.697922 146.4 221.701 3.2936 14WG15-11 228.89 871.8373 0.747 24.436964 9.32 0.1984832 9.37 0.0351779 0.98 222.87364 2.155 183.84192 15.75 -292.45781 238.17 222.874 2.1545 14WG15-101 114.46 4606.701 1.147 18.583042 9.26 0.2612121 9.42 0.0352054 1.76 223.04478 3.85 235.64321 19.82 363.18897 209.21 223.045 3.8496 14WG15-96 399.87 1154.071 0.722 21.67844 4.99 0.2271539 5.16 0.0357147 1.3 226.21574 2.886 207.84647 9.7 4.3386691 120.36 226.216 2.8865 14WG15-41 422.5 2501.656 1.684 21.400465 4.32 0.2305873 4.4 0.0357896 0.83 226.68218 1.848 210.6834 8.371 35.322267 103.49 226.682 1.8482 14WG15-98 318.13 13330.27 1.211 19.741292 3.67 0.2572581 3.74 0.0368335 0.72 233.17571 1.642 232.4549 7.769 225.16048 84.864 233.176 1.6419 14WG15-164 170.62 13806.97 1.913 21.908505 6.6 0.2351563 6.75 0.0373653 1.38 236.48094 3.209 214.44641 13.04 -21.107967 159.95 236.481 3.2089 14WG15-3 460.06 2710.878 0.807 20.715938 3.31 0.250944 3.39 0.0377034 0.74 238.58163 1.726 227.34273 6.902 112.61473 78.094 238.582 1.7256 14WG15-179 518.12 29091.3 0.803 19.449436 2.18 0.274465 2.32 0.0387162 0.78 244.8704 1.886 246.25724 5.07 259.47365 50.108 244.87 1.8857 14WG15-180 220.19 7008.186 6.168 20.515015 6.1 0.2633318 6.2 0.0391808 1.09 247.75346 2.658 237.34832 13.11 135.58113 143.43 247.753 2.6579 14WG15-111 306.62 11213.4 1.288 19.171157 3.43 0.2823487 3.6 0.0392584 1.09 248.23465 2.655 252.51896 8.047 292.50312 78.334 248.235 2.655 14WG15-76 249.87 4848.124 2.701 20.808139 5.29 0.2611711 5.39 0.0394146 1.04 249.2033 2.551 235.6102 11.34 102.13729 125.13 249.203 2.5513 14WG15-15 202.81 4215.238 1.26 20.888609 5.78 0.2725226 5.85 0.0412868 0.93 260.80398 2.383 244.70857 12.73 92.998287 136.94 260.804 2.3828 14WG15-148 49.547 1155.088 1.172 20.169384 17.2 0.2849722 17.5 0.0416864 3.03 263.2773 7.812 254.5942 39.38 175.33332 404.19 263.277 7.8121 14WG15-10 206.76 6451.64 1.799 20.449832 5.22 0.2822061 5.27 0.0418557 0.73 264.32541 1.89 252.40608 11.79 143.04236 122.64 264.325 1.8897 14WG15-123 320 6831.588 0.613 18.995251 3.36 0.31119 3.5 0.0428716 1.01 270.60783 2.665 275.10297 8.444 313.53773 76.373 270.608 2.6655 14WG15-53 550.59 7133.234 3.584 19.100674 2.5 0.3225397 2.54 0.0446818 0.47 281.78777 1.303 283.85426 6.293 300.93202 56.934 281.788 1.3028 14WG15-30 147.75 4206.039 0.768 19.400387 6.82 0.3209973 6.89 0.0451659 0.98 284.77426 2.734 282.6694 17.01 265.30356 156.74 284.774 2.7338 14WG15-112 26.081 1063.266 0.647 15.943866 20.9 0.4061406 21.6 0.0469644 5.7 295.85768 16.47 346.09205 63.55 698.75724 449.17 295.858 16.475 14WG15-89 169.62 1242.437 1.464 23.649188 8.58 0.2817958 8.65 0.0483336 1.07 304.28293 3.187 252.08108 19.3 -209.52222 215.64 304.283 3.1869 14WG15-39 231.82 3455.776 1.753 20.29547 4.76 0.3301284 4.82 0.0485938 0.78 305.88246 2.337 289.6639 12.16 160.82001 111.37 305.882 2.3369 14WG15-48 175.97 3963.057 3.195 20.224403 4.92 0.3450162 5 0.0506074 0.88 318.24953 2.726 300.96567 13.03 168.97403 115.09 318.25 2.7256 14WG15-141 208.4 5104.675 3.992 20.277615 5.05 0.3462554 5.19 0.0509228 1.19 320.1845 3.717 301.90074 13.56 162.83373 118.25 320.184 3.7167 14WG15-90 91.832 1185.215 1.201 22.781025 11.1 0.3099497 11.1 0.051211 1.33 321.95215 4.163 274.14199 26.77 -116.48976 273.29 321.952 4.1626 14WG15-140 191.81 6832.477 0.801 19.710027 5.23 0.3631285 5.28 0.0519094 0.77 326.23384 2.439 314.54785 14.29 228.83844 120.8 326.234 2.4387 14WG15-14 75.049 3043.721 0.757 18.776244 9.19 0.3848397 9.41 0.0524068 2.01 329.28088 6.449 330.59289 26.56 339.85956 208.57 329.281 6.4495 14WG15-32 176.54 1833.042 0.923 19.159184 7.46 0.3831704 7.69 0.0532436 1.88 334.40501 6.119 329.36819 21.65 293.92355 170.55 334.405 6.1185 14WG15-117 192.68 12049.51 1.128 20.228766 4.94 0.3705133 5.06 0.0543591 1.1 341.22837 3.652 320.03384 13.89 168.47054 115.39 341.228 3.6523 14WG15-45 295.87 12079.74 1.033 18.467677 2.43 0.439343 2.47 0.0588457 0.4 368.60179 1.449 369.78909 7.644 377.21651 54.712 368.602 1.4493 14WG15-80 184.13 8353.352 3.017 18.525041 3.35 0.4726851 3.41 0.0635082 0.67 396.92552 2.575 393.04193 11.13 370.235 75.414 396.926 2.5753 14WG15-157 56.722 2863.432 0.607 20.700631 9.87 0.4293784 10 0.0644648 1.79 402.72118 6.996 362.73512 30.6 114.36738 233.3 402.721 6.9955 14WG15-52 233.23 1554.292 2.426 19.424669 3.59 0.4646346 3.66 0.0654582 0.72 408.73435 2.852 387.47603 11.79 262.40802 82.456 408.734 2.8524 14WG15-191 284.8 7154.892 1.879 18.639414 2.84 0.4960973 2.9 0.0670653 0.6 418.45068 2.417 409.05712 9.764 356.35513 64.068 418.451 2.4167 14WG15-187 179.87 6986.603 1.4 19.104694 4.49 0.4878865 4.55 0.0676017 0.75 421.69049 3.066 403.46925 15.16 300.45202 102.45 421.69 3.0657 14WG15-173 234.86 11559.9 3.56 18.574914 3.12 0.5027639 3.23 0.0677313 0.83 422.47314 3.398 413.57161 10.97 364.17607 70.356 422.473 3.3985 14WG15-174 217.02 13255.48 1.348 19.208959 3.51 0.4882682 3.61 0.0680238 0.88 424.23877 3.6 403.72966 12.04 288.01476 80.142 424.239 3.5998 14WG15-115 677.12 15859.4 3.099 18.250233 1.24 0.5182842 1.55 0.0686017 0.93 427.72608 3.861 424.00456 5.38 403.79743 27.775 427.726 3.8606 14WG15-121 300.04 7225.995 1.397 17.89326 2.67 0.5290114 2.73 0.068652 0.57 428.02932 2.353 431.15336 9.595 447.85961 59.388 428.029 2.3533 14WG15-106 65.75 11631.31 1.53 19.379515 7.07 0.4917741 7.24 0.0691206 1.56 430.85521 6.502 406.11881 24.25 267.74165 162.45 430.855 6.5023 14WG15-17 151.75 4832.763 1.088 18.853267 5.08 0.5056233 5.14 0.0691373 0.75 430.95606 3.136 415.50179 17.51 330.58233 115.29 430.956 3.1359 14WG15-27 126.56 1000.131 2.137 21.084736 7.07 0.4558125 7.15 0.0697033 1.1 434.36767 4.625 381.34147 22.75 70.795316 168.3 434.368 4.6247 14WG15-9 218.07 5631.425 1.771 18.282888 3.54 0.52642 3.61 0.0698033 0.71 434.97045 2.985 429.43099 12.65 399.79464 79.366 434.97 2.9851 14WG15-94 393.98 17588.64 0.571 18.115453 1.72 0.5344147 1.79 0.0702144 0.51 437.44736 2.14 434.73525 6.348 420.37143 38.472 437.447 2.1404 14WG15-66 101.93 4324.255 1.38 18.783486 5.99 0.5155505 6.09 0.0702338 1.11 437.56407 4.699 422.1747 21.05 338.94328 135.83 437.564 4.6985 14WG15-77 185.19 4353.666 1.257 19.512705 4.16 0.4967714 4.21 0.0703028 0.66 437.97987 2.801 409.51455 14.19 252.05141 95.731 437.98 2.8008 14WG15-29 370.2 1630.895 0.776 18.06318 6.07 0.541754 6.15 0.0709733 0.98 442.01691 4.171 439.58038 21.94 426.81982 135.44 442.017 4.1709 14WG15-81 166.99 2530.455 1.602 19.710547 4.48 0.4969473 4.59 0.0710408 0.98 442.42305 4.175 409.63388 15.46 228.77587 103.55 442.423 4.175 14WG15-116 153.33 6627.344 2.996 18.877392 4.26 0.5205054 4.33 0.0712633 0.78 443.76223 3.348 425.48896 15.07 327.66796 96.802 443.762 3.3482 14WG15-114 104.93 5576.736 1.538 18.829505 6 0.5231484 6.16 0.0714435 1.42 444.84627 6.121 427.2524 21.5 333.44223 136.04 444.846 6.1215 14WG15-22 367.94 15407.21 0.847 18.412675 2.06 0.536556 2.13 0.0716524 0.54 446.10309 2.348 436.15121 7.565 383.92216 46.354 446.103 2.3484 14WG15-160 146.72 7190.35 0.553 18.363248 4.16 0.5381851 4.24 0.071677 0.81 446.25124 3.494 437.2272 15.05 389.95848 93.352 446.251 3.4939

167 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 14WG15-171 97.52 7223.467 1.086 18.912858 6.04 0.5274981 6.24 0.0723564 1.56 450.33645 6.788 430.14789 21.88 323.39643 137.3 450.336 6.7885 14WG15-166 295.65 17405.07 1.423 17.92898 2.14 0.5605527 2.24 0.0728905 0.67 453.5464 2.93 451.88615 8.178 443.42712 47.596 453.546 2.9296 14WG15-128 207.11 7538.657 1.075 18.947905 4.13 0.5312015 4.21 0.0729994 0.8 454.20074 3.502 432.60671 14.82 319.16879 93.868 454.201 3.5017 14WG15-151 265.93 9542.43 1.286 18.419157 2.22 0.5551207 2.36 0.0741576 0.8 461.15559 3.579 448.34559 8.561 383.13011 49.9 461.156 3.5793 14WG15-153 380.01 26417.56 1.259 17.809388 1.62 0.5754961 1.72 0.0743344 0.59 462.21661 2.632 461.56289 6.382 458.32196 35.849 462.217 2.6317 14WG15-19 166.05 1937.816 1.196 19.495348 3.46 0.5266164 3.5 0.0744602 0.53 462.97103 2.368 429.56165 12.27 254.07137 79.648 462.971 2.3678 14WG15-150 283.29 13410.55 0.678 17.960145 1.94 0.5731368 2.34 0.0746564 1.31 464.14793 5.851 460.04118 8.646 439.56268 43.14 464.148 5.8513 14WG15-31 260.97 4343.25 2.095 18.286123 3.03 0.5689227 3.16 0.0754525 0.89 468.92185 4.021 457.31757 11.64 399.39841 67.986 468.922 4.0207 14WG15-189 71.014 6395.511 0.586 18.142809 6.47 0.6334527 6.57 0.0833523 1.18 516.10115 5.844 498.24441 25.89 417.00227 144.61 516.101 5.8442 14WG15-51 140.36 10074.45 0.908 17.784331 3.8 0.730333 3.85 0.0942014 0.64 580.33681 3.566 556.74862 16.51 461.4115 84.204 580.337 3.566 14WG15-162 52.522 10504.05 0.927 18.742466 7.04 0.7635146 7.22 0.103787 1.6 636.56378 9.715 576.03568 31.73 343.92938 159.38 636.564 9.7153 14WG15-143 124.2 6421.133 1.472 16.239762 2.99 0.9533724 3.08 0.11229 0.73 686.03337 4.737 679.85716 15.25 659.45247 64.08 686.033 4.737 14WG15-198 93.225 4105.256 1.049 16.797494 4.42 0.9949468 4.5 0.1212113 0.83 737.53171 5.774 701.24118 22.79 586.64518 96.022 737.532 5.7738 14WG15-195 145.89 9269.444 1.357 15.909577 2.09 1.0539224 2.27 0.1216091 0.88 739.8184 6.154 730.8233 11.82 703.35593 44.495 739.818 6.1543 14WG15-194 320.38 23836.98 2.886 15.545916 1.35 1.0866246 1.43 0.1225165 0.45 745.0317 3.161 746.86273 7.541 752.33357 28.581 745.032 3.1613 14WG15-139 94.052 8249.936 0.342 16.306567 2.86 1.0382377 2.95 0.1227886 0.71 746.59412 4.974 723.03961 15.24 650.65969 61.418 746.594 4.9743 14WG15-167 151.37 15886.59 3.359 15.789323 1.86 1.0777911 1.94 0.1234232 0.54 750.23662 3.795 742.55505 10.22 719.44272 39.591 750.237 3.7948 14WG15-131 44.555 2914.875 1.025 17.868592 8.16 0.955665 8.25 0.1238496 1.22 752.68317 8.643 681.04819 40.94 450.92377 181.45 752.683 8.6433 14WG15-185 684.84 24304.46 1.063 15.045071 0.57 1.2372167 0.75 0.1350016 0.48 816.33532 3.692 817.6195 4.187 821.13506 11.902 816.335 3.6917 14WG15-82 99.859 4347.458 1.569 14.95833 2.82 1.2583307 2.91 0.1365138 0.7 824.9188 5.393 827.15734 16.45 833.18247 58.873 824.919 5.3929 14WG15-110 229.33 19696.19 0.321 15.009879 1.23 1.2743262 1.35 0.1387256 0.56 837.45185 4.394 834.32383 7.709 825.98488 25.752 837.452 4.3935 14WG15-2 151.9 13455.22 1.439 14.555572 1.81 1.3407687 2.26 0.1415409 1.35 853.36979 10.79 863.56235 13.12 889.79245 37.343 853.37 10.789 14WG15-103 105.72 9544.164 0.68 14.612937 2.32 1.366785 2.46 0.144856 0.81 872.06355 6.626 874.78551 14.41 881.66283 47.972 872.064 6.6265 14WG15-152 217.02 20122.54 1.034 14.33731 1.1 1.4891839 1.27 0.1548513 0.64 928.10025 5.509 925.98356 7.725 920.96591 22.635 920.966 22.635 14WG15-127 260.69 32842.3 5.178 14.225054 0.81 1.5100852 0.99 0.1557952 0.57 933.36729 4.976 934.474 6.059 937.07786 16.59 937.078 16.59 14WG15-107 107.68 8183.777 1.752 14.163701 2.4 1.5818434 2.68 0.1624946 1.18 970.62514 10.64 963.09452 16.66 945.95389 49.198 945.954 49.198 14WG15-71 319.31 15721.64 4.992 14.123118 1.08 1.5137188 1.24 0.155051 0.6 929.21507 5.213 935.94279 7.579 951.83369 22.165 951.834 22.165 14WG15-21 147.71 20280.55 1.666 13.984842 1.28 1.5712723 1.39 0.1593704 0.55 953.2772 4.876 958.92861 8.625 971.89447 26.027 971.894 26.027 14WG15-58 180.77 5811.019 1.375 13.982718 1.21 1.6455328 1.34 0.1668771 0.59 994.88202 5.432 987.83824 8.476 972.2031 24.611 972.203 24.611 14WG15-24 270.52 9762.044 0.66 13.98184 0.99 1.6610239 1.19 0.1684376 0.67 1003.4968 6.213 993.76655 7.559 972.33271 20.15 972.333 20.15 14WG15-56 320.68 9236.52 2.98 13.951928 0.67 1.6852765 0.85 0.1705313 0.53 1015.0379 4.997 1002.9788 5.447 976.73662 13.632 976.737 13.632 14WG15-178 259.48 18109.46 0.89 13.939907 0.95 1.6410673 1.57 0.1659147 1.24 989.56306 11.4 986.1229 9.888 978.45643 19.455 978.456 19.455 14WG15-50 325.88 20498.14 2.616 13.843108 0.95 1.6308595 1.02 0.1637378 0.38 977.51519 3.45 982.1908 6.437 992.64445 19.279 992.644 19.279 14WG15-57 132.61 3936.5 1.916 13.656962 1.63 1.7587744 1.72 0.1742059 0.54 1035.2433 5.128 1030.397 11.12 1020.1053 33.049 1020.11 33.049 14WG15-125 207.36 10896.22 1.705 13.46566 1.2 1.9063889 1.31 0.1861821 0.53 1100.6596 5.338 1083.3237 8.745 1048.6406 24.257 1048.64 24.257 14WG15-145 150.14 23526.11 1.23 12.538313 0.76 2.3084208 1.41 0.2099195 1.18 1228.389 13.23 1214.8764 9.968 1190.942 15.008 1190.94 15.008 14WG15-65 284.78 3311.712 0.786 12.50702 1.53 2.3325034 1.64 0.2115801 0.6 1237.2305 6.71 1222.2408 11.67 1195.8629 30.185 1195.86 30.185 14WG15-132 87.118 13975.72 1.532 12.379372 1.57 2.1691262 2.06 0.1947521 1.33 1147.0667 14.02 1171.1996 14.34 1216.1038 30.943 1216.1 30.943 14WG15-95 185.6 9788.047 1.481 11.561471 1.49 2.240067 1.68 0.1878334 0.78 1109.6275 7.947 1193.6782 11.78 1349.2326 28.664 1349.23 28.664 14WG15-186 248.78 43586.17 1.902 11.351794 0.42 2.9104331 0.66 0.2396188 0.51 1384.7149 6.341 1384.6252 5 1384.4695 8.12 1384.47 8.12 14WG15-196 79.552 17833.69 0.953 10.9105 1.15 3.2454883 1.4 0.2568168 0.8 1473.5354 10.52 1468.0985 10.9 1460.2263 21.95 1460.23 21.95 14WG15-147 84.211 16291.7 0.825 10.866952 1.18 3.2059456 1.33 0.2526752 0.6 1452.2574 7.782 1458.5969 10.27 1467.8248 22.487 1467.82 22.487 14WG15-197 318.04 49597.37 5.133 10.819195 0.37 3.2543807 0.76 0.2553654 0.67 1466.0865 8.754 1470.2231 5.912 1476.1838 6.9342 1476.18 6.9342 14WG15-199 106.94 17668.29 1.114 10.342758 0.91 3.6686099 1.2 0.2751925 0.78 1567.105 10.78 1564.5645 9.557 1561.1217 17.125 1561.12 17.125 14WG15-126 144.12 26328.57 1.139 10.132845 0.88 3.8964926 1.21 0.2863545 0.83 1623.2859 11.87 1612.9554 9.768 1599.4793 16.459 1599.48 16.459 14WG15-36 154.58 29504.27 0.668 10.019085 0.56 3.8472535 0.7 0.2795617 0.42 1589.1543 5.874 1602.6931 5.65 1620.517 10.486 1620.52 10.486 14WG15-142 142.81 13839.27 0.515 9.7266053 0.8 4.422932 1.97 0.3120113 1.8 1750.5965 27.65 1716.6438 16.33 1675.4581 14.718 1675.46 14.718 14WG15-135 54.677 11320.49 1.741 9.4641204 1.27 4.6142519 1.44 0.3167235 0.68 1773.708 10.48 1751.8489 12.01 1725.8509 23.334 1725.85 23.334 14WG15-118 28.331 6355.615 0.872 9.109748 2.38 5.0976203 2.66 0.3368004 1.19 1871.2585 19.25 1835.7096 22.57 1795.6189 43.317 1795.62 43.317 14WG15-182 25.649 13439.04 1.022 9.1084971 2.89 4.8511528 3.05 0.3204722 0.97 1792.035 15.17 1793.815 25.66 1795.8688 52.591 1795.87 52.591 14WG15-92 141.81 19596.9 1.781 8.7575279 0.57 5.002805 0.84 0.3177561 0.62 1778.7612 9.592 1819.7968 7.136 1867.0827 10.372 1867.08 10.372 14WG15-190 722.69 73719.11 1.854 8.7415041 0.13 4.9928475 0.34 0.3165433 0.31 1772.826 4.834 1818.1111 2.873 1870.3872 2.4241 1870.39 2.4241 14WG15-170 177.92 38367.96 2.69 8.738113 0.33 5.2984783 0.94 0.3357898 0.88 1866.3836 14.19 1868.6176 7.999 1871.0871 5.9831 1871.09 5.9831 14WG15-169 337.66 48277.49 1.482 8.7257943 0.2 5.0685882 0.7 0.3207678 0.68 1793.4775 10.59 1830.8636 5.976 1873.6316 3.5536 1873.63 3.5536 14WG15-119 278.32 42574.84 5.29 8.7237947 0.26 5.3777504 0.57 0.3402552 0.51 1887.8973 8.374 1881.3174 4.92 1874.0448 4.7164 1874.04 4.7164 14WG15-43 418.48 24257.24 2.402 8.6894 0.18 5.3552352 0.63 0.3374948 0.61 1874.6063 9.851 1877.7265 5.418 1881.1652 3.3308 1881.17 3.3308 14WG15-93 350.58 36227.77 1.315 8.6608868 0.21 4.9566895 0.44 0.3113528 0.38 1747.3605 5.875 1811.9662 3.691 1887.0847 3.7509 1887.08 3.7509 14WG15-188 191.3 41249.03 2.149 8.6444802 0.38 5.4288755 0.68 0.340367 0.56 1888.435 9.168 1889.4244 5.795 1890.4938 6.8049 1890.49 6.8049 14WG15-181 515.49 71960.31 1.42 8.6308471 0.17 5.4129526 0.43 0.3388335 0.4 1881.0555 6.524 1886.9064 3.715 1893.3338 3.0085 1893.33 3.0085 14WG15-163 148.66 28319.33 2.561 8.6279817 0.48 5.3955033 0.74 0.3376291 0.56 1875.2537 9.085 1884.1399 6.317 1893.9312 8.6634 1893.93 8.6634 14WG15-113 211.15 30838.84 3.48 8.6188182 0.29 5.5174518 0.78 0.3448935 0.73 1910.168 12.04 1903.3188 6.743 1895.8426 5.2288 1895.84 5.2288 14WG15-61 248.87 28119.06 2.183 8.6131662 0.29 5.4023221 0.49 0.3374753 0.39 1874.5125 6.318 1885.2219 4.166 1897.0223 5.2594 1897.02 5.2594 14WG15-46 365.8 72263.33 6.69 8.6068581 0.19 5.2882172 0.31 0.3301054 0.25 1838.8925 3.981 1866.9621 2.676 1898.3397 3.4265 1898.34 3.4265 14WG15-176 168.25 32910.3 3.235 8.5810931 0.3 5.4766829 0.49 0.3408466 0.38 1890.7409 6.291 1896.9472 4.18 1903.7284 5.3802 1903.73 5.3802 14WG15-87 209.42 25875.24 6.008 8.3634847 0.36 5.6184648 0.58 0.3408032 0.46 1890.5324 7.504 1918.9353 4.999 1949.7516 6.3594 1949.75 6.3594 14WG15-8 247.13 30052.31 2.142 8.334707 0.28 5.8434185 0.58 0.3532288 0.51 1949.9978 8.592 1952.8734 5.052 1955.9089 5.013 1955.91 5.013 14WG15-168 316.91 56763.86 2.78 8.3051342 0.2 5.7789844 0.54 0.3480943 0.5 1925.4921 8.317 1943.2678 4.645 1962.2538 3.4878 1962.25 3.4878 14WG15-16 493.22 70408.6 0.923 7.9547796 0.13 6.6869692 0.39 0.3857947 0.36 2103.2956 6.542 2070.9007 3.426 2038.8098 2.3417 2038.81 2.3417 14WG15-138 216.4 48516.34 2.32 7.9169449 0.25 6.2394568 0.53 0.358264 0.47 1973.9397 7.941 2009.9976 4.652 2047.238 4.4851 2047.24 4.4851 14WG15-172 379.05 62558.75 0.734 7.2805363 0.16 7.4008489 0.69 0.3907902 0.67 2126.4919 12.2 2161.073 6.195 2194.0714 2.7946 2194.07 2.7946 14WG15-33 457.76 78490.76 1.421 7.1068405 0.19 8.4874225 0.49 0.4374729 0.45 2339.3174 8.834 2284.5783 4.439 2235.9424 3.2843 2235.94 3.2843 14WG15-34 324.76 76405.77 1.7 7.0312395 0.14 8.3290377 0.62 0.4247422 0.61 2281.972 11.66 2267.4843 5.646 2254.429 2.4159 2254.43 2.4159 14WG15-156 424.81 58893 6.726 6.925886 0.12 8.0447739 0.77 0.4040991 0.76 2187.8866 14.1 2236.0635 6.948 2280.4581 2.0799 2280.46 2.0799 14WG15-130 131.47 23216.61 1.171 6.5843744 0.42 8.7829848 0.77 0.419426 0.64 2257.8732 12.28 2315.7279 6.99 2367.1279 7.0841 2367.13 7.0841 14WG15-137 146.3 42952.06 1.581 6.5560441 0.26 9.0980688 0.82 0.4326033 0.77 2317.4425 15.07 2347.9151 7.46 2374.483 4.3569 2374.48 4.3569 14WG15-42 210.47 4561.197 0.365 6.5494017 0.33 7.4499788 0.66 0.3538795 0.57 1953.097 9.655 2166.9939 5.917 2376.2113 5.6168 2376.21 5.6168 14WG15-5 203.94 31047.32 1.27 6.506302 0.22 8.3199338 0.59 0.3926023 0.55 2134.8857 9.992 2266.4929 5.357 2387.4553 3.6886 2387.46 3.6886

168 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 14WG15-73 120.44 9335.766 0.974 6.4303576 0.32 8.9856054 0.91 0.4190648 0.85 2256.2325 16.25 2336.5432 8.319 2407.4281 5.3919 2407.43 5.3919 14WG15-54 295.76 51854.84 2.354 6.3706105 0.19 7.9555612 0.86 0.3675789 0.84 2017.9982 14.55 2225.9986 7.773 2423.2782 3.2734 2423.28 3.2734 14WG15-122 201.3 51511.94 0.908 6.3683352 0.43 9.440351 0.72 0.4360264 0.58 2332.8274 11.39 2381.7619 6.628 2423.8842 7.2486 2423.88 7.2486 14WG15-4 223.9 55871.79 1.3 6.3301134 0.18 10.155827 0.55 0.4662571 0.52 2467.1265 10.64 2449.0653 5.074 2434.0863 3.0341 2434.09 3.0341 14WG15-149 152.45 37108 3.32 6.2748204 0.26 9.6274445 0.46 0.4381381 0.38 2342.3001 7.494 2399.7967 4.247 2448.9435 4.3984 2448.94 4.3984 14WG15-155 24.035 8325.502 0.583 6.2566935 1.61 9.854335 1.96 0.4471682 1.13 2382.6507 22.56 2421.2464 18.11 2453.8377 27.149 2453.84 27.149 14WG15-193 190.23 38408.99 2.383 6.2314266 0.2 9.847274 0.74 0.4450433 0.72 2373.1781 14.24 2420.5857 6.859 2460.6794 3.3449 2460.68 3.3449 14WG15-192 365.66 37818.12 10.85 6.216402 0.13 9.1389296 0.43 0.4120341 0.41 2224.2146 7.775 2352.0155 3.961 2464.7585 2.1626 2464.76 2.1626 14WG15-49 36.779 9203.082 0.847 6.1027536 1.03 10.741564 1.18 0.475436 0.56 2507.3556 11.69 2501.0255 10.92 2495.8773 17.387 2495.88 17.387 14WG15-78 83.307 18138.86 1.19 6.0621441 0.42 10.701495 0.61 0.4705106 0.44 2485.7999 9.087 2497.5546 5.647 2507.1155 7.0497 2507.12 7.0497 14WG15-102 301.78 27939.82 1.102 6.0440367 0.16 10.367699 0.68 0.4544731 0.66 2415.1086 13.37 2468.1687 6.33 2512.141 2.7408 2512.14 2.7408 14WG15-175 48.827 11143.23 1.533 6.0253875 0.65 11.228297 0.82 0.4906792 0.5 2573.6137 10.57 2542.2681 7.599 2517.3362 10.841 2517.34 10.841 14WG15-177 98.14 24750.82 1.824 5.901774 0.82 10.188723 1.43 0.436115 1.17 2333.2252 22.92 2452.055 13.2 2552.1137 13.691 2552.11 13.691 14WG15-129 152.45 54854.87 1.27 5.7200619 0.26 11.925888 0.83 0.494755 0.79 2591.2154 16.9 2598.6009 7.82 2604.3475 4.4013 2604.35 4.4013 14WG15-37 79.989 18591.29 1.676 5.7144092 0.33 10.591176 0.55 0.4389492 0.44 2345.9347 8.626 2487.9364 5.102 2605.995 5.5245 2605.99 5.5245 14WG15-108 120.62 27143.76 1.553 5.6796261 0.27 12.162606 0.93 0.5010085 0.89 2618.1288 19.2 2617.0279 8.747 2616.1627 4.4835 2616.16 4.4835 14WG15-88 378.59 31568.03 0.842 5.5616314 0.12 10.421378 0.34 0.4203645 0.31 2262.1341 5.967 2472.952 3.106 2651.0424 2.0032 2651.04 2.0032 14WG15-6 231.46 56498.77 1.647 5.2988881 0.12 13.9836 0.47 0.5374059 0.45 2772.5805 10.24 2748.5975 4.461 2731.0186 2.013 2731.02 2.013 13FS4244 13FS4244-38 73.759 7297.288 2.961 19.635239 23.2 0.2285407 23.6 0.0325461 4.41 206.46355 8.951 208.99329 44.66 237.58913 541.8 206.464 8.9507 13FS4244-75 269.38 59854.81 1.793 19.32097 5.03 0.2349482 5.11 0.032923 0.89 208.81658 1.83 214.27529 9.872 274.67681 115.33 208.817 1.8301 13FS4244-46 159.65 2291.009 1.748 18.681665 16.5 0.2432035 16.5 0.0329522 1.64 208.99854 3.368 221.0403 32.86 351.27597 374.12 208.999 3.3679 13FS4244-35 272.11 19607.88 1.334 20.08561 4.68 0.2267803 4.97 0.0330361 1.69 209.5224 3.481 207.53731 9.334 185.03322 108.97 209.522 3.4812 13FS4244-90 472.64 46078.8 1.154 19.189414 2.05 0.2415024 2.85 0.033611 1.97 213.10899 4.139 219.64997 5.625 290.32389 46.895 213.109 4.1386 13FS4244-99 291.51 21969.74 2.107 20.95667 5.77 0.2212796 5.98 0.0336328 1.58 213.24445 3.306 202.97426 11.01 85.309749 137.02 213.244 3.3061 13FS4244-18 98.806 1940.488 1.887 18.276621 17.3 0.2537571 17.7 0.0336367 3.59 213.26879 7.528 229.62353 36.39 400.56252 390.88 213.269 7.528 13FS4244-15 110.7 9955.628 2.21 20.79017 9.99 0.2230999 11.2 0.03364 4.99 213.28971 10.47 204.48652 20.68 104.15113 236.54 213.29 10.466 13FS4244-41 448.26 39062.17 1.322 19.58647 5.11 0.2378219 5.38 0.0337837 1.67 214.18552 3.51 216.63532 10.49 243.36532 117.88 214.186 3.5104 13FS4244-85 181.43 26218.49 1.933 20.066375 9.6 0.2342255 10.1 0.034088 3.17 216.08316 6.742 213.68091 19.48 187.26348 223.79 216.083 6.7422 13FS4244-6 99.121 14009.02 0.669 21.47796 14.7 0.2191674 15 0.0341403 2.88 216.40926 6.125 201.21662 27.38 26.660804 354.52 216.409 6.1253 13FS4244-83 69.382 11214.25 1.549 25.669782 29.1 0.1844642 29.5 0.0343426 4.73 217.66988 10.12 171.89471 46.64 -419.6833 775.22 217.67 10.116 13FS4244-84 107.27 12431.64 1.673 19.666179 15.2 0.241096 15.6 0.0343881 3.44 217.95382 7.375 219.31752 30.76 234.00082 352.73 217.954 7.3752 13FS4244-95 109.87 4235.377 1.663 20.031525 19.3 0.2370194 19.4 0.0344347 1.86 218.24415 3.999 215.97685 37.67 191.35274 451.74 218.244 3.9993 13FS4244-39 284.92 23029.19 1.985 19.964381 6.78 0.238892 7.26 0.0345904 2.6 219.21445 5.614 217.51273 14.22 199.14815 157.64 219.214 5.6143 13FS4244-93 500.47 21515.86 1.847 19.825211 3.45 0.241389 4.1 0.0347084 2.22 219.94911 4.795 219.55722 8.101 215.3356 79.978 219.949 4.7945 13FS4244-62 213.39 24858.51 1.988 20.951382 6.21 0.2295273 6.58 0.0348775 2.18 221.00304 4.731 209.8084 12.47 85.908085 147.32 221.003 4.7312 13FS4244-1 299.71 25083.54 1.599 20.260305 5.26 0.2381206 5.92 0.0349898 2.71 221.70247 5.916 216.88036 11.56 164.83088 123.02 221.702 5.9157 13FS4244-4 169.98 18427.94 1.146 21.753625 11.1 0.223398 11.4 0.035246 2.63 223.29778 5.775 204.73397 21.22 -3.9673374 269.28 223.298 5.7748 13FS4244-65 231.12 19554.11 1.816 21.092919 3.52 0.2311797 4.35 0.0353659 2.56 224.04458 5.628 211.17204 8.292 69.869693 83.709 224.045 5.6282 13FS4244-10 342.14 8294.071 1.33 19.847776 4.26 0.2638777 5.38 0.0379851 3.29 240.33156 7.75 237.78704 11.41 212.70045 98.795 240.332 7.7497 13FS4244-59 138.8 26175.51 1.453 21.060064 12.9 0.2533016 13 0.0386898 1.84 244.70653 4.418 229.25456 26.76 73.623054 307.92 244.707 4.4177 13FS4244-17 210.3 18720.26 1.293 19.668189 7.93 0.2746862 8.08 0.0391832 1.53 247.76808 3.73 246.43349 17.67 233.76433 183.26 247.768 3.7299 13FS4244-28 147.14 25118.24 1.205 19.707067 9.3 0.3076286 9.84 0.0439691 3.22 277.38841 8.742 272.34123 23.52 229.15994 215.24 277.388 8.7423 13FS4244-13 222.81 38138.87 1.797 19.300201 3.93 0.3269369 4.32 0.0457641 1.79 288.4627 5.041 287.22469 10.81 277.18466 90.13 288.463 5.041 13FS4244-19 169.78 21208.31 1.121 19.411425 5.35 0.3250886 5.8 0.0457676 2.24 288.48435 6.307 285.80933 14.44 264.01092 122.83 288.484 6.3067 13FS4244-9 144.77 14848.54 1.121 18.715514 8.05 0.3393208 8.41 0.0460586 2.43 290.27827 6.907 296.65701 21.64 347.14896 182.37 290.278 6.9065 13FS4244-54 106.86 3874.187 1.612 20.858012 10.7 0.3155613 10.8 0.047737 1.69 300.6132 4.974 278.48241 26.29 96.478937 252.91 300.613 4.974 13FS4244-94 39.812 9201.686 0.995 22.285934 26.7 0.3062971 27 0.0495077 4.01 311.49824 12.19 271.30679 64.26 -62.61046 660.23 311.498 12.195 13FS4244-27 66.776 12011.44 1.153 20.845925 12 0.3378133 12.2 0.0510736 2.21 321.10963 6.911 295.51341 31.27 97.861718 284.65 321.11 6.9113 13FS4244-71 59.408 13852.44 0.532 22.236656 24.5 0.3172628 24.8 0.0511667 3.55 321.68049 11.15 279.79485 60.69 -57.213042 605.51 321.68 11.148 13FS4244-22 54.853 18036.73 0.998 19.196856 17.8 0.3717749 18.4 0.0517617 4.88 325.32867 15.47 320.96811 50.74 289.43188 408.77 325.329 15.472 13FS4244-34 184.36 18037.69 0.383 18.797982 5.23 0.3890976 6.46 0.0530479 3.8 333.20711 12.34 333.71001 18.38 337.23292 118.51 333.207 12.344 13FS4244-57 96.638 13422.08 1.503 19.296329 11.5 0.3825993 11.7 0.0535448 2.16 336.24824 7.078 328.94884 33 277.64416 265.01 336.248 7.0782 13FS4244-61 56.431 18758.5 1.373 18.649185 12.9 0.4416295 13.3 0.0597333 3.48 374.00348 12.66 371.40078 41.54 355.19554 291.99 374.003 12.663 13FS4244-88 30.732 4943.288 2.779 20.883933 26 0.422296 27 0.0639629 7.33 399.68093 28.4 357.69152 81.57 93.549631 624.53 399.681 28.403 13FS4244-1 203.51 49750.19 1.458 18.425701 3.82 0.4843106 4.34 0.0647212 2.06 404.27396 8.072 401.02594 14.39 382.3324 85.992 404.274 8.0724 13FS4244-23 40.671 8252.17 0.598 20.491855 16.6 0.4399083 17.9 0.0653796 6.58 408.25882 26.05 370.18776 55.44 138.22949 392.13 408.259 26.045 13FS4244-30 82.339 14583.22 0.741 17.754069 10.8 0.5420983 11.2 0.0698031 2.74 434.96925 11.54 439.80709 39.91 465.18649 240.67 434.969 11.539 13FS4244-60 325.25 99747.81 1.403 18.208985 1.49 0.5325668 1.69 0.0703329 0.8 438.16098 3.382 433.51166 5.964 408.8617 33.327 438.161 3.3822 13FS4244-52 159.93 33309.06 1.792 18.143468 3.82 0.5419962 4.56 0.0713206 2.51 444.10723 10.75 439.73986 16.29 416.92113 85.29 444.107 10.752 13FS4244-67 88.32 24598.03 0.989 17.26416 5.13 0.596414 6.02 0.0746779 3.17 464.27702 14.18 474.95543 22.86 526.8894 112.44 464.277 14.181 13FS4244-40 288.36 99622.66 1.639 17.545523 2.48 0.5882382 2.67 0.0748546 0.97 465.33672 4.363 469.74193 10.03 491.30327 54.791 465.337 4.363 13FS4244-55 70.647 12339.15 1.101 18.024256 7.85 0.5807798 8.02 0.075922 1.6 471.73545 7.291 464.96247 29.91 431.62772 175.23 471.735 7.2907 13FS4244-76 167.64 55582.14 0.997 17.500182 3.68 0.6282469 3.75 0.0797392 0.72 494.56562 3.445 495.00322 14.68 497.01801 81.008 494.566 3.4446 13FS4244-3 101.72 22635.46 1.303 16.810434 7.47 0.6672443 8.1 0.0813509 3.14 504.1813 15.21 519.03554 32.93 584.9811 162.31 504.181 15.213 13FS4244-68 52.633 9033.191 1.487 17.578156 8.1 0.6537206 8.82 0.0833421 3.49 516.04037 17.32 510.76577 35.42 487.21115 179.01 516.04 17.323 13FS4244-24 197.7 46383.65 0.764 17.22877 2.9 0.7024107 3.19 0.0877696 1.33 542.33272 6.908 540.22979 13.37 531.38625 63.535 542.333 6.9082 13FS4244-20 107.94 41108.55 0.69 17.022223 3.32 0.7668545 3.51 0.0946734 1.14 583.11718 6.334 577.9569 15.48 557.70265 72.518 583.117 6.3343 13FS4244-44 75.111 17566.63 3.252 16.278309 6.01 0.9129251 6.21 0.1077812 1.54 659.84931 9.642 658.61148 30.08 654.3665 129.08 659.849 9.6421 13FS4244-47 302.13 11087.24 0.78 15.374199 1.18 1.0852574 4.05 0.1210108 3.87 736.37866 26.92 746.1972 21.38 775.74064 24.837 736.379 26.923 13FS4244-74 266.49 12067.76 1.384 14.503336 1.42 1.1805884 5.31 0.1241839 5.11 754.59993 36.42 791.5873 29.18 897.21565 29.239 754.6 36.42 13FS4244-12 265.97 112587.1 0.906 15.441555 1.05 1.1171252 1.65 0.1251099 1.27 759.90781 9.119 761.59731 8.836 766.53932 22.106 759.908 9.1192 13FS4244-86 67.341 3692.896 0.707 14.983756 5.97 1.1522951 6.43 0.1252227 2.39 760.55433 17.12 778.32642 34.95 829.64224 124.52 760.554 17.12 13FS4244-26 32.693 12794.34 1.471 15.309198 7.17 1.1815786 7.63 0.1311939 2.6 794.67303 19.44 792.04825 41.97 784.64777 150.78 794.673 19.435 13FS4244-50 156.13 49566.08 1.153 15.148271 1.36 1.2146068 2 0.1334435 1.47 807.48022 11.14 807.30557 11.14 806.80349 28.475 807.48 11.136 13FS4244-49 58.197 23770.58 0.599 14.391344 8.67 1.2952372 8.97 0.1351915 2.31 817.41408 17.75 843.61701 51.44 913.18912 178.7 817.414 17.747 13FS4244-51 33.953 14017.79 1.063 14.965468 7.21 1.3283171 7.61 0.1441753 2.42 868.22947 19.68 858.14665 44.1 832.20319 150.51 868.229 19.678

169 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13FS4244-48 47.643 28530.38 0.537 14.875427 4.38 1.3657233 4.92 0.1473435 2.25 886.05471 18.6 874.3299 28.86 844.74127 91.145 886.055 18.601 13FS4244-97 68.325 30834.49 1.731 14.003619 3.25 1.5670051 3.46 0.159151 1.19 952.05707 10.53 957.24209 21.46 969.19623 66.349 969.196 66.349 13FS4244-7 122.1 107823.1 1.215 12.764507 1.28 2.0901349 4.29 0.1934983 4.1 1140.2979 42.84 1145.5701 29.5 1155.5475 25.383 1155.55 25.383 13FS4244-43 112.99 93418.1 1.302 12.685379 0.81 2.1844234 2.63 0.2009736 2.5 1180.5483 26.99 1176.089 18.33 1167.8753 16.132 1167.88 16.132 13FS4244-73 54.637 77692.83 1.336 9.8914022 1.36 4.0108655 2.05 0.2877363 1.54 1630.2072 22.18 1636.4001 16.7 1644.3508 25.243 1644.35 25.243 13FS4244-36 50.292 46626.72 1.364 9.8114427 2.15 4.0555733 2.65 0.2885917 1.55 1634.4878 22.33 1645.4194 21.59 1659.3959 39.861 1659.4 39.861 13FS4244-80 53.671 29875.49 2.31 9.7527227 1.94 3.8612129 3.94 0.2731168 3.43 1556.6029 47.49 1605.613 31.83 1670.5009 35.913 1670.5 35.913 13FS4244-32 88.492 55999.95 0.715 9.5037491 1.2 4.3146995 2.56 0.2974022 2.26 1678.4141 33.45 1696.1735 21.12 1718.1741 22.036 1718.17 22.036 13FS4244-70 42.735 36025.31 0.705 9.4666177 1.64 4.5607768 2.17 0.3131356 1.42 1756.1182 21.84 1742.1311 18.06 1725.3664 30.099 1725.37 30.099 13FS4244-72 31.316 22853.55 1.88 9.4369467 2.3 4.5565543 2.92 0.3118651 1.79 1749.8783 27.42 1741.3598 24.29 1731.1292 42.278 1731.13 42.278 13FS4244-92 23.201 14895.78 1.497 9.4043069 1.46 4.3661775 1.78 0.2978015 1.02 1680.3977 15.07 1705.9611 14.71 1737.4848 26.767 1737.48 26.767 13FS4244-45 23.283 21264.48 1.403 9.2741164 2.09 4.5912031 2.43 0.3088146 1.23 1734.8707 18.67 1747.6717 20.24 1763.0025 38.274 1763 38.274 13FS4244-66 94.878 72264.59 1.184 8.7836828 0.59 5.3340014 1.1 0.339804 0.93 1885.7266 15.18 1874.3282 9.385 1861.6991 10.574 1861.7 10.574 13FS4244-100 461.19 254116.6 1.236 8.7620055 0.24 4.8904036 1.61 0.3107756 1.59 1744.5224 24.31 1800.6037 13.56 1866.1602 4.3061 1866.16 4.3061 13FS4244-33 85.463 117741.2 8.557 8.7532713 0.85 5.4901208 3.01 0.3485387 2.89 1927.6169 48.1 1899.0518 25.85 1867.9601 15.317 1867.96 15.317 13FS4244-5 120.36 206042.8 2.418 8.7345605 0.68 5.2676914 1.51 0.333703 1.35 1856.3048 21.8 1863.6423 12.92 1871.8206 12.276 1871.82 12.276 13FS4244-81 179.25 144138.8 1.852 8.7241935 0.38 5.0325341 0.63 0.3184276 0.51 1782.0457 7.877 1824.8131 5.349 1873.9624 6.8125 1873.96 6.8125 13FS4244-63 248.56 210706.9 1.887 8.720516 0.44 5.3630699 4.58 0.3391988 4.56 1882.8142 74.4 1878.9775 39.2 1874.7227 7.9993 1874.72 7.9993 13FS4244-58 219.11 80846.82 4.229 8.6603212 0.33 5.4321097 1.78 0.3411939 1.75 1892.4106 28.66 1889.9351 15.26 1887.2023 5.9862 1887.2 5.9862 13FS4244-89 43.42 25615.01 1.522 8.6447923 1.05 5.2793478 1.67 0.3310042 1.29 1843.2472 20.72 1865.5289 14.23 1890.4328 18.943 1890.43 18.943 13FS4244-79 301.48 167896.5 2.566 7.6037238 0.51 6.7440282 1.58 0.3719156 1.5 2038.408 26.16 2078.4099 13.99 2118.2694 8.9767 2118.27 8.9767 13FS4244-56 49.718 80577.47 0.953 7.4079429 0.59 6.3439696 2.94 0.3408454 2.88 1890.7353 47.12 2024.5515 25.76 2163.8717 10.317 2163.87 10.317 13FS4244-25 44.974 44137.19 0.708 6.5110854 0.86 9.1974683 3.15 0.4343306 3.03 2325.2103 59.2 2357.8611 28.88 2386.2038 14.698 2386.2 14.698 13FS4244-77 104.56 117844.3 0.593 6.41076 0.54 8.1327485 3.54 0.3781339 3.5 2067.5605 61.96 2245.892 32.06 2412.6137 9.1707 2412.61 9.1707 13FS4244-10 292.78 96480.6 1.764 6.3042753 0.22 8.3403677 1.63 0.3813459 1.62 2082.5677 28.82 2268.7167 14.82 2441.0156 3.7641 2441.02 3.7641 13FS4244-69 193.72 278279.3 0.72 6.2255587 0.26 10.011447 1.88 0.4520369 1.86 2404.302 37.37 2435.8383 17.36 2462.2715 4.4424 2462.27 4.4424 13FS4244-8 45.22 43563.42 0.646 6.1265078 1.13 10.40734 1.79 0.4624358 1.39 2450.304 28.39 2471.7033 16.63 2489.3323 19.075 2489.33 19.075 13FS4244-14 81.351 108066.2 0.463 6.0320577 0.47 10.575317 1.15 0.4626554 1.05 2451.2718 21.38 2486.5462 10.65 2515.4765 7.837 2515.48 7.837 13FS4244-37 115.14 127698.3 2.352 5.5796715 0.2 12.509141 2.7 0.5062148 2.69 2640.4497 58.26 2643.4143 25.36 2645.6684 3.2526 2645.67 3.2526 13FS4244-82 164.15 67336.01 1.177 3.8946421 0.22 20.602442 1.61 0.5819491 1.6 2956.6974 37.92 3120.0755 15.64 3226.941 3.536 3226.94 3.536 13FS4244-64 51.035 96621.63 1.559 3.2823922 0.36 30.02557 1.64 0.7147933 1.6 3476.503 43.1 3487.6496 16.15 3494.0506 5.5186 3494.05 5.5186 13WJ002 13WJ002-73 336.31 11616.28 1.889 19.915997 3.24 0.2277144 3.59 0.0328921 1.53 208.62338 3.136 208.31009 6.754 204.79086 75.309 208.623 3.1357 13WJ002-44 347.44 18687.46 1.694 19.926079 2.27 0.2282268 3 0.0329828 1.97 209.18951 4.051 208.73386 5.665 203.58517 52.628 209.19 4.0506 13WJ002-27 114.09 12080.94 3.019 20.944312 9.12 0.217292 10.1 0.0330072 4.25 209.34178 8.745 199.65343 18.24 86.707829 216.66 209.342 8.7453 13WJ002-16 218.86 9675.412 1.087 20.427365 4.35 0.2283261 5.2 0.0338272 2.85 214.45731 6.013 208.81592 9.819 145.64748 102.11 214.457 6.013 13WJ002-43 454.59 22940.98 1.375 19.499139 2.34 0.2465245 3.24 0.0348638 2.24 220.91729 4.865 223.74912 6.504 253.65008 53.798 220.917 4.8649 13WJ002-38 112.4 4452.07 0.537 20.929343 7.19 0.2316228 7.45 0.0351589 1.95 222.7556 4.263 211.53741 14.23 88.403957 170.71 222.756 4.2627 13WJ002-07 464.14 26999.5 1.795 19.704241 2.35 0.2624902 2.8 0.0375121 1.53 237.3934 3.559 236.67171 5.912 229.49215 54.234 237.393 3.5587 13WJ002-42 129.96 8318.377 2.447 20.139418 7.7 0.268794 7.87 0.0392613 1.62 248.25282 3.947 241.72904 16.93 178.80017 179.7 248.253 3.947 13WJ002-61 130.53 11776.08 0.958 19.889342 4.32 0.2733492 4.81 0.0394309 2.1 249.30461 5.137 245.36794 10.48 207.87462 100.29 249.305 5.1372 13WJ002-79 378.72 20135.45 1.185 19.685467 2.36 0.2766682 2.75 0.0395006 1.4 249.73669 3.434 248.01107 6.041 231.69332 54.515 249.737 3.4345 13WJ002-74 311.71 32095.89 2.276 19.257307 1.46 0.3078309 1.58 0.0429939 0.62 271.36369 1.645 272.4983 3.78 282.27747 33.284 271.364 1.6448 13WJ002-92 323.43 13277.28 0.947 19.648648 3.33 0.3027988 3.72 0.0431505 1.64 272.33158 4.377 268.58394 8.77 236.04526 76.934 272.332 4.3775 13WJ002-63 225.05 36329.84 1.671 19.195942 2.51 0.3226987 3.14 0.0449268 1.9 283.29946 5.26 283.97639 7.79 289.56325 57.305 283.299 5.26 13WJ002-100 160.23 14140.5 1.081 18.964492 4.5 0.3326658 5.2 0.045756 2.61 288.41301 7.351 291.59899 13.19 317.17999 102.4 288.413 7.3514 13WJ002-57 233.81 9418.717 1.353 19.109786 2.71 0.3342514 3.23 0.0463263 1.77 291.92772 5.04 292.80641 8.222 299.80055 61.741 291.928 5.0403 13WJ002-75 196.91 9108.54 1.626 20.754993 4.9 0.3127392 5.02 0.0470764 1.07 296.54753 3.105 276.3019 12.14 108.19591 115.88 296.548 3.1049 13WJ002-86 227.24 3298.122 1.094 18.740419 4.1 0.3507656 4.17 0.0476755 0.74 300.23448 2.164 305.29678 10.99 344.1399 92.835 300.234 2.1642 13WJ002-58 262.14 30986.95 2.132 19.630665 2.34 0.3572095 4.79 0.0508577 4.18 319.7853 13.03 310.12923 12.79 238.14155 53.879 319.785 13.035 13WJ002-93 96.579 12612.58 1.228 19.902458 8.23 0.3532057 8.57 0.0509839 2.37 320.55946 7.425 307.1294 22.71 206.35177 191.2 320.559 7.4251 13WJ002-76 70.678 8045.404 1.394 18.833897 11.3 0.3798501 11.6 0.0518861 2.82 326.09096 8.961 326.92786 32.48 332.89755 256.23 326.091 8.9608 13WJ002-03 149.08 11847.92 1.208 18.763085 3.7 0.3988706 4.02 0.0542794 1.56 340.74135 5.182 340.82878 11.64 341.43724 83.873 340.741 5.1824 13WJ002-71 352.19 46599.41 0.913 18.520198 1.37 0.4239742 1.6 0.0569487 0.82 357.04215 2.848 358.88884 4.831 370.82301 30.871 357.042 2.8475 13WJ002-33 160.69 21922.78 1.616 18.79273 4.05 0.4381108 4.28 0.0597135 1.38 373.88296 5.026 368.91944 13.24 337.82872 91.741 373.883 5.0264 13WJ002-05 185.6 11979.03 1.406 19.050788 2.27 0.4380926 4.44 0.060531 3.81 378.85379 14.03 368.9066 13.73 306.8736 51.718 378.854 14.029 13WJ002-25 111.32 14530.26 1.802 18.199775 3.34 0.5088042 3.45 0.0671607 0.85 419.02726 3.432 417.64475 11.81 409.99478 74.816 419.027 3.432 13WJ002-94 308.08 44062.19 5.673 18.091712 2.12 0.5170522 2.61 0.0678442 1.52 423.1546 6.236 423.18029 9.043 423.29962 47.414 423.155 6.2361 13WJ002-52 219.89 30050.54 1.622 18.309965 3.22 0.5123233 4.42 0.0680347 3.02 424.30432 12.42 420.01021 15.21 396.47738 72.292 424.304 12.42 13WJ002-13 407.56 52844.47 4.678 18.066295 1.16 0.5200222 2.37 0.0681381 2.07 424.92828 8.5 425.16623 8.232 426.43531 25.839 424.928 8.5002 13WJ002-84 119.09 4594.131 0.767 17.160962 8.27 0.5586403 8.51 0.0695301 2.01 433.32386 8.432 450.64108 30.98 540.0169 181.15 433.324 8.4317 13WJ002-30 79.409 13357.5 1.527 18.312408 4.51 0.5326722 4.78 0.0707464 1.59 440.65083 6.789 433.58154 16.88 396.17836 101.16 440.651 6.7892 13WJ002-20 215.23 33609 1.053 17.801802 1.62 0.5532844 2.23 0.071435 1.53 444.79536 6.555 447.14592 8.05 459.25382 35.958 444.795 6.5551 13WJ002-31 106.53 16986.14 1.728 18.208268 3.64 0.5456623 4.3 0.0720595 2.29 448.55169 9.935 442.15111 15.42 408.94972 81.441 448.552 9.9355 13WJ002-18 325.88 52229.37 1.184 18.032515 1.21 0.5556946 1.5 0.072676 0.88 452.25778 3.836 448.72024 5.425 430.60708 26.991 452.258 3.8358 13WJ002-47 374.43 62397.05 1.787 17.637714 1.22 0.5748852 3.26 0.0735398 3.03 457.44638 13.37 461.16911 12.1 479.73351 27.07 457.446 13.366 13WJ002-08 258.22 24523.49 1.5 18.089659 2.66 0.5671242 3.08 0.0744059 1.54 462.64528 6.896 456.15296 11.31 423.55273 59.464 462.645 6.8959 13WJ002-85 274.47 45815.82 1.69 17.971078 1.7 0.5902918 2 0.0769378 1.06 477.81863 4.869 471.05398 7.553 438.20859 37.909 477.819 4.8685 13WJ002-82 327.48 33096.38 1.252 17.334686 1.45 0.6852897 2.01 0.0861567 1.4 532.76696 7.138 529.96646 8.299 517.90416 31.757 532.767 7.1378 13WJ002-05 516.25 79563.63 4.463 16.956606 0.41 0.7436207 1.22 0.0914511 1.15 564.11364 6.236 564.51621 5.299 566.15995 8.8237 564.114 6.2362 13WJ002-45 496.12 146302.3 4.419 16.929739 0.85 0.7501383 1.26 0.0921065 0.93 567.98329 5.062 568.30462 5.481 569.61179 18.444 567.983 5.062 13WJ002-48 158.44 5891.427 1.059 16.734175 2.12 0.7888999 2.22 0.0957469 0.65 589.43608 3.641 590.54764 9.934 594.81619 45.991 589.436 3.6412 13WJ002-01 532.63 62555.43 4.356 16.743534 0.57 0.8113685 1.21 0.098529 1.06 605.78245 6.151 603.22147 5.485 593.62992 12.3 605.782 6.1514 13WJ002-91 262.1 54702.06 2.904 16.575539 1.2 0.8268078 2.32 0.0993965 1.99 610.87103 11.6 611.83946 10.67 615.40584 25.835 610.871 11.596 13WJ002-81 310.1 115507.3 5.154 14.714605 1.28 1.1870503 3.62 0.1266825 3.39 768.91177 24.54 794.59183 19.95 867.3286 26.542 768.912 24.537 13WJ002-24 204.85 46735.2 0.815 15.079132 1.29 1.2089167 1.9 0.1322122 1.39 800.47312 10.5 804.6933 10.55 816.41011 26.936 800.473 10.495 13WJ002-23 126.95 26259.96 1.068 15.17632 1.9 1.210777 2.63 0.1332691 1.82 806.4879 13.77 805.5481 14.6 802.93062 39.723 806.488 13.773

170 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13WJ002-12 171.54 72964.52 1.698 15.091163 1.01 1.2759449 1.89 0.139654 1.59 842.70557 12.6 835.04626 10.75 814.74501 21.157 842.706 12.596 13WJ002-56 164.92 255915.4 1.124 14.912655 1.82 1.3046552 2.83 0.1411073 2.17 850.92084 17.28 847.77487 16.27 839.52862 37.888 850.921 17.282 13WJ002-67 290.28 55960.86 0.464 14.683804 0.88 1.3780558 4.24 0.1467588 4.14 882.76883 34.19 879.60935 24.93 871.68635 18.23 882.769 34.185 13WJ002-19 259.52 72604.2 8.213 14.309762 0.74 1.5232514 1.6 0.1580894 1.42 946.15036 12.48 939.78608 9.796 924.91735 15.147 924.917 15.147 13WJ002-49 100.58 10607.78 2.443 14.273797 1.87 1.5698729 2.54 0.1625185 1.72 970.75745 15.46 958.37584 15.73 930.05224 38.357 930.052 38.357 13WJ002-64 266.74 59450.49 2.477 14.262342 1.01 1.5066218 2.11 0.1558453 1.86 933.64684 16.13 933.07198 12.89 931.73457 20.652 931.735 20.652 13WJ002-41 132.74 54159.76 2.601 14.165269 1.5 1.5186819 1.86 0.1560236 1.1 934.64114 9.53 937.94559 11.36 945.70372 30.669 945.704 30.669 13WJ002-55 249.98 50530.5 2.087 14.048495 1.07 1.5224124 3.15 0.1551175 2.96 929.58634 25.6 939.44839 19.28 962.66443 21.863 962.664 21.863 13WJ002-46 250.06 40620.37 1.523 14.006169 0.74 1.6528616 2.29 0.1679015 2.16 1000.5386 20.06 990.64721 14.48 968.78574 15.189 968.786 15.189 13WJ002-65 346.42 58141.73 2.254 13.906017 0.45 1.5921183 2.34 0.1605746 2.29 959.96914 20.44 967.1274 14.57 983.45186 9.2091 983.452 9.2091 13WJ002-04 432.9 85785.3 1.502 13.846804 0.45 1.6359414 1.37 0.1642918 1.29 980.58368 11.76 984.15026 8.622 992.1029 9.0719 992.103 9.0719 13WJ002-95 243.06 23739.72 1.652 13.557201 1.78 1.7460686 2.96 0.1716841 2.37 1021.3835 22.34 1025.7098 19.1 1034.9315 35.897 1034.93 35.897 13WJ002-83 215.04 95018.1 1.295 13.177365 0.93 1.9745095 1.67 0.1887064 1.38 1114.3634 14.17 1106.8479 11.23 1092.0906 18.575 1092.09 18.575 13WJ002-34 250.14 100991.8 1.067 12.983798 0.34 2.0148971 1.46 0.1897376 1.42 1119.9533 14.6 1120.5419 9.913 1121.6903 6.8577 1121.69 6.8577 13WJ002-59 228.27 109867.3 1.432 12.836226 0.61 2.1423905 3.25 0.1994503 3.2 1172.3666 34.27 1162.5971 22.54 1144.4214 12.16 1144.42 12.16 13WJ002-89 455.88 178919.4 3.707 12.642915 0.2 2.2181672 1.46 0.203395 1.45 1193.5324 15.79 1186.7919 10.24 1174.5497 3.9061 1174.55 3.9061 13WJ002-40 317.7 177110.2 1.222 12.63073 0.41 2.2180806 2.05 0.203191 2.01 1192.4397 21.88 1186.7646 14.36 1176.4573 8.1659 1176.46 8.1659 13WJ002-36 49.69 16082.54 1.696 12.367196 2.75 2.190352 3.03 0.1964644 1.28 1156.299 13.59 1177.9776 21.14 1218.0094 54.011 1218.01 54.011 13WJ002-53 317.95 37622.82 1.212 11.883024 0.49 2.5343798 0.91 0.2184225 0.77 1273.5343 8.92 1281.9595 6.651 1296.0907 9.4996 1296.09 9.4996 13WJ002-69 110.69 39180.64 0.864 11.758863 1.11 2.6723445 1.28 0.2279064 0.63 1323.5171 7.573 1320.841 9.444 1316.4832 21.529 1316.48 21.529 13WJ002-96 345.33 160133.5 5.125 10.929011 0.28 3.1519802 0.95 0.2498406 0.91 1437.6538 11.72 1445.4845 7.343 1457.0034 5.3943 1457 5.3943 13WJ002-60 94.584 51422.7 1.094 10.544432 1.36 3.2431077 2.28 0.248018 1.83 1428.2464 23.4 1467.529 17.69 1524.8156 25.693 1524.82 25.693 13WJ002-88 191.1 67256 1.828 10.472518 0.87 2.9114915 4.19 0.221139 4.1 1287.8907 47.84 1384.9 31.67 1537.7015 16.291 1537.7 16.291 13WJ002-97 114.22 40944.78 2.38 10.203775 0.51 3.6417699 1.36 0.2695083 1.26 1538.3055 17.25 1558.7102 10.84 1586.4504 9.6103 1586.45 9.6103 13WJ002-76 114.95 87194.41 1.543 10.156657 0.37 3.810477 1.06 0.2806912 0.99 1594.8426 13.97 1594.9599 8.495 1595.0978 6.9348 1595.1 6.9348 13WJ002-70 98.152 41852.05 1.742 9.3308673 0.77 4.7164377 1.79 0.3191794 1.61 1785.7204 25.11 1770.1638 14.97 1751.8439 14.17 1751.84 14.17 13WJ002-26 225.81 193572.6 4.256 9.0774789 0.14 4.7412121 1.53 0.3121428 1.52 1751.2428 23.37 1774.5549 12.83 1802.0764 2.4584 1802.08 2.4584 13WJ002-87 108.64 49084.69 0.898 8.7860327 0.85 4.6771324 6.26 0.2980377 6.21 1681.5708 91.86 1763.1581 52.45 1861.216 15.388 1861.22 15.388 13WJ002-39 206.55 119441.4 2.67 8.7756446 0.26 5.3197651 1.22 0.3385869 1.19 1879.8681 19.48 1872.0435 10.46 1863.3523 4.7694 1863.35 4.7694 13WJ002-15 192.69 160893.4 1.806 8.7689067 0.19 5.4248568 1.55 0.3450106 1.54 1910.7294 25.47 1888.7895 13.31 1864.739 3.4708 1864.74 3.4708 13WJ002-10 480.57 181391.2 1.724 8.7663897 0.16 5.4909191 1.46 0.3491118 1.45 1930.3559 24.23 1899.1767 12.55 1865.2572 2.8217 1865.26 2.8217 13WJ002-45 164.13 79978.45 2.708 8.7572467 0.36 5.3359691 1.87 0.3389063 1.83 1881.4058 29.9 1874.6436 15.97 1867.1407 6.4746 1867.14 6.4746 13WJ002-72 225.4 172883.2 2.739 8.7406462 0.18 5.2197607 0.99 0.330897 0.97 1842.7279 15.62 1855.8475 8.44 1870.5643 3.1921 1870.56 3.1921 13WJ002-32 30.936 12902.11 4.061 8.7214599 2.95 5.0865637 5.85 0.3217454 5.05 1798.2476 79.2 1833.8667 49.65 1874.5275 53.248 1874.53 53.248 13WJ002-29 169.1 116361.2 1.686 8.7021178 0.28 5.4490006 0.49 0.3439066 0.41 1905.436 6.763 1892.598 4.238 1878.5298 4.9674 1878.53 4.9674 13WJ002-28 214.8 120947 2.267 8.7002744 0.35 5.1475853 1.45 0.3248144 1.41 1813.198 22.33 1843.9959 12.36 1878.9116 6.2266 1878.91 6.2266 13WJ002-90 378.11 176457.6 3.901 8.6679155 0.13 5.432249 1.12 0.3415019 1.11 1893.8906 18.19 1889.9571 9.572 1885.6241 2.3712 1885.62 2.3712 13WJ002-37 90.959 34592.7 0.92 8.0769496 0.51 6.3711523 1.11 0.3732193 0.99 2044.5307 17.38 2028.3028 9.771 2011.8156 8.9625 2011.82 8.9625 13WJ002-22 168.45 48478.87 2.507 7.9282051 3.55 5.6465786 8.93 0.3246826 8.2 1812.5568 129.6 1923.2393 77.22 2044.7263 62.694 2044.73 62.694 13WJ002-80 120.07 102298.1 3.442 7.1648931 3.13 7.1150099 4.16 0.3697294 2.74 2028.1269 47.73 2125.9232 37.08 2221.8599 54.28 2221.86 54.28 13WJ002-62 364.89 38331.41 5.592 6.7714709 4.03 8.1343845 7.18 0.3994905 5.95 2166.6929 109.4 2246.0738 65.05 2319.2013 69.148 2319.2 69.148 13WJ002-11 90.64 22740.11 1.491 6.5160735 1.39 7.7163259 2.67 0.364666 2.28 2004.2527 39.21 2198.5052 24 2384.8994 23.756 2384.9 23.756 13WJ002-06 153.73 122697.8 1.563 6.5160601 0.65 9.3813349 2.69 0.4433518 2.61 2365.6279 51.73 2376.006 24.71 2384.903 11.144 2384.9 11.144 13WJ002-54 149.73 149972.6 1.036 6.322143 0.25 9.5592613 2.59 0.438316 2.58 2343.0976 50.66 2393.2612 23.82 2436.2213 4.1829 2436.22 4.1829 13WJ002-14 216.97 158203.5 2.767 6.2628411 0.23 9.913163 1.93 0.4502797 1.91 2396.4959 38.28 2426.7347 17.76 2452.1766 3.8251 2452.18 3.8251 13WJ002-02 260.3 222656.9 0.978 5.8084848 0.15 11.714277 1.9 0.4934885 1.89 2585.7514 40.32 2581.8404 17.77 2578.7595 2.5322 2578.76 2.5322 13WJ002-99 89.075 73892.11 0.616 5.3773162 0.22 13.079167 1.43 0.5100872 1.41 2657.0016 30.68 2685.3797 13.46 2706.7996 3.7117 2706.8 3.7117 13AWJ1 13AWJ1-38 40.095 2620.918 1.131 19.51192 32.6 0.2582202 33.5 0.0365417 7.82 231.36116 17.77 233.23164 69.95 252.14517 767.93 231.361 17.775 13AWJ1-59 284.88 30174.81 0.516 19.819188 6.22 0.2542655 6.34 0.0365487 1.25 231.40466 2.838 230.03519 13.06 216.04071 144.14 231.405 2.8379 13AWJ1-19 500.69 52546.57 2.528 20.108363 3.83 0.269686 3.99 0.0393309 1.12 248.68418 2.725 242.44261 8.601 182.39563 89.214 248.684 2.7252 13AWJ1-2 87.317 8369.889 0.927 20.085989 17.3 0.2717832 17.6 0.0395926 2.86 250.30749 7.018 244.11839 38.14 184.98927 406.23 250.307 7.0181 13AWJ1-31 68.908 6635.745 0.554 24.006094 37.6 0.2280776 38.1 0.0397103 6.24 251.03688 15.37 208.6105 72.05 -247.26466 981.47 251.037 15.368 13AWJ1-86 155.2 16219.86 1.143 19.159602 8.65 0.2861751 8.95 0.0397665 2.27 251.38531 5.596 255.5443 20.21 293.88183 197.89 251.385 5.5961 13AWJ1-32 66.863 5085.413 1.273 22.753268 24 0.2413209 24.1 0.0398233 2.29 251.73771 5.643 219.5015 47.55 -113.48503 597.56 251.738 5.6432 13AWJ1-98 268.74 20834.31 1.14 19.904928 6.58 0.2797676 6.72 0.0403884 1.34 255.24003 3.363 250.47313 14.92 206.04933 152.86 255.24 3.3628 13AWJ1-45 31.551 4001.769 0.735 13.928468 26.4 0.4035775 27.6 0.0407689 7.88 257.59722 19.89 344.23955 80.71 980.1268 547.75 257.597 19.89 13AWJ1-10 57.941 6953.503 1.569 19.559879 37.9 0.2955247 38.1 0.0419236 4.42 264.74543 11.45 262.89874 88.56 246.45463 901.79 264.745 11.454 13AWJ1-3 150.72 12045.43 2.334 18.992708 8.31 0.3053797 8.4 0.0420655 1.22 265.62309 3.187 270.59348 19.95 313.80437 189.24 265.623 3.1866 13AWJ1-17 84.134 10174.19 1.13 21.986796 19.7 0.2708295 20.5 0.0431874 5.92 272.55954 15.81 243.35671 44.46 -29.749377 480.52 272.56 15.81 13AWJ1-22 157 21844.43 1.259 20.511902 10.1 0.2904576 10.3 0.0432103 2.08 272.70139 5.541 258.91955 23.47 135.93015 236.79 272.701 5.5413 13AWJ1-50 45.764 4302.916 1.173 23.132395 29.3 0.2667221 29.8 0.0447485 5.34 282.19935 14.74 240.0696 63.79 -154.35786 741.4 282.199 14.744 13AWJ1-43 150.34 26766.56 1.008 18.664387 7.49 0.3320593 8.12 0.0449498 3.13 283.44158 8.682 291.13678 20.54 353.37369 169.37 283.442 8.682 13AWJ1-77 291.12 31875.65 1.892 19.519596 7.34 0.3294552 7.4 0.0466408 0.95 293.8649 2.722 289.14988 18.62 251.19525 169.04 293.865 2.7223 13AWJ1-96 297.21 42871.04 0.569 19.503101 5.62 0.330402 6.07 0.0467353 2.31 294.447 6.647 289.87275 15.32 253.17947 129.28 294.447 6.6467 13AWJ1-14 76.817 10272.24 1.175 18.429082 15.9 0.352678 16.2 0.0471391 3.15 296.93301 9.152 306.73337 42.88 381.92029 358.84 296.933 9.1525 13AWJ1-69 94.536 8450.764 0.66 18.448257 12.8 0.3726439 14.7 0.0498595 7.24 313.65905 22.16 321.61112 40.57 379.58244 288.99 313.659 22.156 13AWJ1-93 96.072 8737.25 0.817 21.109747 17.1 0.3455098 17.4 0.0528983 3 332.2913 9.721 301.33821 45.33 68.017961 409.76 332.291 9.7206 13AWJ1-68 135.57 17297.55 0.388 18.599735 9.78 0.4008044 9.91 0.0540677 1.55 339.44685 5.136 342.23147 28.78 361.16427 221.14 339.447 5.1359 13AWJ1-88 91.412 3143.401 0.998 19.43914 10.7 0.3925064 11 0.0553379 2.27 347.21022 7.683 336.19873 31.38 260.73415 246.91 347.21 7.6827 13AWJ1-28 598.77 72603.99 4.866 18.683412 2.06 0.4204246 2.39 0.0569696 1.22 357.1696 4.229 356.35464 7.191 351.04405 46.539 357.17 4.2285 13AWJ1-46 119.45 23112.56 0.664 18.229532 7.72 0.5256269 7.84 0.0694947 1.38 433.11085 5.77 428.90332 27.43 406.33898 172.91 433.111 5.77 13AWJ1-18 38.288 5864.624 0.756 21.667699 27.7 0.4446426 28 0.0698751 3.74 435.4033 15.75 373.5208 87.61 5.5511538 678.47 435.403 15.753 13AWJ1-82 164.7 27471.42 1.413 17.387053 5.49 0.561401 5.59 0.0707942 1.03 440.93888 4.386 452.4379 20.4 511.27728 120.78 440.939 4.3865 13AWJ1-8 82.088 14614.23 1.09 17.530396 5.83 0.5968655 6.16 0.0758869 2 471.52529 9.107 475.24256 23.38 493.21378 128.53 471.525 9.1068 13AWJ1-56 44.317 25744.67 1.237 15.764329 9.09 1.0023146 9.88 0.1145983 3.86 699.39783 25.57 704.9843 50.24 722.80525 193.24 699.398 25.57 13AWJ1-57 341.52 21281.18 0.606 15.048708 1.09 1.1480588 2.28 0.1253032 2.01 761.01524 14.41 776.32591 12.39 820.63118 22.73 761.015 14.41

171 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13AWJ1-13 185.98 23920.93 0.552 15.618023 3.98 1.1157116 4.12 0.1263795 1.07 767.1783 7.714 760.91914 22.08 742.55465 84.282 767.178 7.7137 13AWJ1-29 90.202 69584.98 0.864 15.117299 3.71 1.1585951 4.01 0.1270295 1.51 770.89713 11 781.29421 21.83 811.12503 77.572 770.897 10.996 13AWJ1-78 134.44 41817.1 1.126 15.237208 1.79 1.1891701 2.18 0.131416 1.23 795.93813 9.238 795.57548 12 794.53978 37.619 795.938 9.238 13AWJ1-39 52.701 20848.89 1.427 15.478159 8.54 1.1719172 8.65 0.1315573 1.36 796.74348 10.18 787.54156 47.42 761.55021 180.35 796.743 10.18 13AWJ1-99 83.725 17475.76 0.637 15.095196 2.71 1.2154673 3.09 0.1330702 1.49 805.35646 11.3 807.69999 17.24 814.18547 56.686 805.356 11.302 13AWJ1-25 164.87 63845.99 2.335 14.525203 2.16 1.3196578 2.44 0.1390216 1.14 839.12746 8.96 854.36329 14.09 894.10615 44.495 839.127 8.9603 13AWJ1-37 106.39 41439.89 1.216 15.042903 4.1 1.2843455 4.26 0.1401239 1.18 845.3631 9.315 838.78719 24.35 821.4362 85.616 845.363 9.3145 13AWJ1-4 154.62 36427.67 1.006 13.506165 1.95 1.6777634 2.15 0.1643469 0.9 980.88845 8.176 1000.1339 13.67 1042.5457 39.417 1042.55 39.417 13AWJ1-63 92.281 51430.34 1.071 13.002459 2.44 1.9996234 2.58 0.1885699 0.86 1113.6234 8.748 1115.3848 17.48 1118.8369 48.592 1118.84 48.592 13AWJ1-27 139.64 45896.41 0.97 12.230928 1.41 2.398579 1.93 0.2127709 1.33 1243.563 14.99 1242.1764 13.84 1239.7726 27.555 1239.77 27.555 13AWJ1-84 45.484 60648.25 0.63 11.135816 5.38 3.2223659 7.9 0.2602529 5.79 1491.1358 77.1 1462.5533 61.33 1421.2684 102.88 1421.27 102.88 13AWJ1-52 131.98 45750.15 2.078 11.002858 1.76 2.627875 4.21 0.2097051 3.82 1227.2463 42.73 1308.4704 30.97 1444.1857 33.505 1444.19 33.505 13AWJ1-47 28.589 37528.8 0.945 10.172044 4.7 3.8870233 4.87 0.2867637 1.28 1625.3362 18.45 1610.9899 39.35 1592.2705 87.785 1592.27 87.785 13AWJ1-20 17.091 12343.63 0.895 9.8280698 6.04 4.2826246 6.24 0.305265 1.56 1717.3638 23.58 1690.027 51.41 1656.2597 112 1656.26 112 13AWJ1-85 39.263 42283.4 0.62 9.7519398 3.55 4.301893 3.73 0.3042631 1.17 1712.4141 17.54 1693.7238 30.76 1670.6494 65.582 1670.65 65.582 13AWJ1-81 21.361 17978.13 1.162 9.5895481 4.46 4.4374717 5.27 0.308626 2.81 1733.9417 42.65 1719.3625 43.68 1701.6405 82.156 1701.64 82.156 13AWJ1-55 61.962 49111.39 0.561 9.4356804 2.15 4.4437981 2.29 0.3041069 0.82 1711.6418 12.26 1720.5432 19.02 1731.3755 39.365 1731.38 39.365 13AWJ1-12 23.108 11614.74 0.929 9.2995313 3.8 4.5393193 4.26 0.3061615 1.93 1721.7899 29.21 1738.2054 35.48 1757.9988 69.492 1758 69.492 13AWJ1-66 110.72 84531.43 1.888 9.0034276 0.37 5.0308121 0.68 0.3285071 0.57 1831.1413 9.132 1824.5232 5.754 1816.9627 6.626 1816.96 6.626 13AWJ1-16 65.337 55276.26 1.035 8.9787282 1.06 5.069116 1.67 0.3301002 1.29 1838.8672 20.66 1830.9519 14.18 1821.9455 19.249 1821.95 19.249 13AWJ1-36 28.147 21998.41 0.838 8.8783535 2.93 5.1778907 3.18 0.3334142 1.25 1854.9086 20.13 1848.9891 27.11 1842.3205 53.028 1842.32 53.028 13AWJ1-83 144.53 115711.6 1.061 8.8734574 0.55 5.1651802 0.88 0.3324123 0.68 1850.0632 10.99 1846.8979 7.477 1843.3189 10.007 1843.32 10.007 13AWJ1-70 371.99 290903.9 3.116 8.8703297 0.24 5.1351276 0.57 0.3303617 0.52 1840.1346 8.328 1841.9362 4.869 1843.9569 4.3425 1843.96 4.3425 13AWJ1-23 123.69 134454.5 1.827 8.8533057 0.63 5.1459522 1.1 0.3304227 0.9 1840.4303 14.43 1843.7261 9.372 1847.4328 11.475 1847.43 11.475 13AWJ1-21 136.87 64504.14 0.804 8.8478566 0.9 4.2103543 1.92 0.2701814 1.7 1541.7226 23.26 1676.0399 15.76 1848.5465 16.275 1848.55 16.275 13AWJ1-51 95.244 18133.06 1.118 8.8305272 1.13 4.4656816 2.53 0.2860047 2.26 1621.5326 32.42 1724.6168 20.97 1852.0918 20.406 1852.09 20.406 13AWJ1-67 236.39 118069 2.472 8.804823 0.61 5.0952097 1.07 0.3253729 0.87 1815.9154 13.84 1835.3081 9.044 1857.3568 11.004 1857.36 11.004 13AWJ1-62 115.06 71355.49 0.906 8.7929695 1.2 5.2712442 1.36 0.3361611 0.64 1868.1749 10.42 1864.2177 11.6 1859.7905 21.64 1859.79 21.64 13AWJ1-44 449.71 139248.8 1.644 8.7846696 0.38 4.9119358 2.2 0.3129514 2.16 1755.2138 33.22 1804.3086 18.52 1861.4962 6.8911 1861.5 6.8911 13AWJ1-33 84.126 73266.38 1.456 8.7612167 0.89 5.2319869 1.41 0.3324526 1.09 1850.2584 17.51 1857.8415 11.99 1866.3227 16.062 1866.32 16.062 13AWJ1-40 138.88 97941.35 1.149 8.7497787 0.71 5.2260027 0.82 0.3316389 0.41 1846.3202 6.606 1856.866 6.999 1868.6802 12.824 1868.68 12.824 13AWJ1-5 332.89 167950.3 5.241 8.7335631 0.36 5.1890101 1.5 0.3286811 1.45 1831.9857 23.19 1850.815 12.75 1872.0266 6.476 1872.03 6.476 13AWJ1-100 204.55 172587 1.581 8.7003174 0.91 5.4146007 1.76 0.3416648 1.5 1894.6736 24.66 1887.1673 15.06 1878.9027 16.441 1878.9 16.441 13AWJ1-94 253.87 238033.5 2.588 8.6984249 0.38 5.4615619 0.65 0.3445531 0.53 1908.5364 8.766 1894.5739 5.602 1879.2947 6.8498 1879.29 6.8498 13AWJ1-87 242.13 262775.6 4.672 8.6946111 0.51 5.3964803 0.75 0.3402981 0.56 1888.1033 9.118 1884.295 6.456 1880.085 9.1453 1880.08 9.1453 13AWJ1-73 390.2 278135.9 8.193 8.6887256 0.61 4.9905906 3.09 0.3144899 3.03 1762.7636 46.71 1817.7286 26.14 1881.305 11.045 1881.31 11.045 13AWJ1-53 87.117 65873.04 2.115 8.3258514 1.05 5.7319809 1.23 0.3461243 0.64 1916.0651 10.68 1936.2029 10.67 1957.807 18.791 1957.81 18.791 13AWJ1-60 143.84 123786.5 1.144 8.0236849 0.44 6.1011126 0.95 0.3550436 0.84 1958.6372 14.17 1990.4061 8.272 2023.5464 7.8186 2023.55 7.8186 13AWJ1-24 66.483 113011.6 0.792 7.8503643 0.96 6.3542057 1.48 0.3617844 1.13 1990.6261 19.36 2025.9657 13.01 2062.1481 16.929 2062.15 16.929 13AWJ1-48 27.179 32536.42 0.996 7.6578158 3.88 6.4665433 5.22 0.35915 3.49 1978.1433 59.45 2041.3587 45.89 2105.8399 68.043 2105.84 68.043 13AWJ1-92 128.15 91873.95 1.478 6.3496835 0.39 7.9343931 3.59 0.3653966 3.57 2007.7031 61.53 2223.5957 32.36 2428.8535 6.6208 2428.85 6.6208 13AWJ1-11 59.655 59196.37 0.81 6.2509563 0.79 9.4412703 2.21 0.4280314 2.07 2296.837 39.95 2381.8513 20.32 2455.3892 13.336 2455.39 13.336 13AWJ1-34 72.349 99146.89 0.956 6.2364644 0.93 9.3376765 1.82 0.4223534 1.56 2271.1544 29.88 2371.7268 16.69 2459.3134 15.798 2459.31 15.798 13AWJ1-90 110.44 141935 0.962 6.2275532 0.61 9.5175302 1.1 0.4298733 0.92 2305.1463 17.75 2389.2404 10.1 2461.7302 10.267 2461.73 10.267 13AWJ1-64 175.03 122811.1 1.173 6.1965266 0.69 10.471467 2.19 0.4706029 2.08 2486.2042 42.94 2477.3954 20.33 2470.1618 11.673 2470.16 11.673 13AWJ1-54 24.939 40481.58 2.439 6.133186 2.02 10.63736 2.23 0.4731717 0.94 2497.4548 19.51 2491.974 20.7 2487.496 34.06 2487.5 34.06 13AWJ1-71 23.27 37604.5 0.92 6.0957662 1.52 10.585215 1.73 0.4679794 0.82 2474.6938 16.95 2487.414 16.06 2497.8065 25.625 2497.81 25.625 13AWJ1-76 74.708 105101.9 2.715 6.0614628 0.63 11.059176 1.19 0.4861821 1.02 2554.1368 21.43 2528.127 11.12 2507.3046 10.562 2507.3 10.562 13AWJ1-91 62.376 114409.1 0.887 6.0448992 0.8 10.985286 1.82 0.4816141 1.63 2534.2921 34.19 2521.8863 16.92 2511.9011 13.488 2511.9 13.488 13AWJ1-6 39.428 88674.85 0.867 6.0429562 1.06 10.55152 1.97 0.4624483 1.67 2450.3591 33.96 2484.4565 18.3 2512.4416 17.772 2512.44 17.772 13AWJ1-41 74.7 123838.7 1.195 5.9956063 0.86 10.549696 1.05 0.4587455 0.61 2434.0165 12.31 2484.2962 9.74 2525.6601 14.388 2525.66 14.388 13AWJ1-7 135.35 337361.8 0.913 5.9518058 0.41 10.819224 0.8 0.4670287 0.68 2470.5178 14.05 2507.7193 7.423 2537.9653 6.895 2537.97 6.895 13AWJ1-42 105.24 110052.5 0.761 5.9507952 0.38 11.315893 1.27 0.4883853 1.22 2563.6862 25.72 2549.5157 11.88 2538.2501 6.3212 2538.25 6.3212 13AWJ1-65 129.87 156609.1 1.119 5.9416755 0.6 11.038686 1.57 0.4756911 1.45 2508.4701 30.15 2526.4003 14.63 2540.822 10.127 2540.82 10.127 13AWJ1-49 43.201 56254.63 0.801 5.9067615 2.97 10.703953 4.99 0.458556 4.02 2433.179 81.4 2497.7678 46.41 2550.6988 49.733 2550.7 49.733 13AWJ1-80 132.97 184133 1.262 5.8678328 0.32 11.99989 2.72 0.5106857 2.7 2659.5564 58.82 2604.3975 25.48 2561.7633 5.3815 2561.76 5.3815 13AWJ1-79 90.327 92127.61 1.344 5.8630996 0.45 11.455123 1.02 0.4871085 0.91 2558.1541 19.3 2560.9301 9.499 2563.1135 7.4602 2563.11 7.4602 13AWJ1-9 136.75 244247.7 0.367 5.8323034 0.35 11.82609 1.57 0.5002419 1.53 2614.8353 32.82 2590.731 14.66 2571.9209 5.782 2571.92 5.782 13AWJ1-15 113.99 111992.4 1.143 4.9900425 0.4 14.614697 0.71 0.5289234 0.59 2736.9143 13.22 2790.4885 6.793 2829.4401 6.514 2829.44 6.514 14JB28 (n=188)(29.77151, 100.39402) - Redbed Sandstone 14JB28-182 546.68 56335.21 1.676 19.74203 2.75 0.253779 4.04 0.0363368 2.97 230.08634 6.709 229.64122 8.313 225.09594 63.532 230.086 6.7088 14JB28-272 705.65 439841.8 1.059 19.103814 2.8 0.262489 5.05 0.0363689 4.2 230.28618 9.494 236.67074 10.65 300.55645 63.892 230.286 9.4944 14JB28-174 1095.5 324062.6 0.99 19.828001 2.46 0.2626987 3.47 0.0377777 2.45 239.04338 5.739 236.83936 7.332 215.03324 57.035 239.043 5.7394 14JB28-106 412.23 24295.91 1.284 19.843604 3.16 0.2643382 3.98 0.0380434 2.42 240.69357 5.716 238.15693 8.451 213.1879 73.25 240.694 5.7161 14JB28-220 411.74 31956.25 1.633 19.098956 4.42 0.2760241 4.84 0.0382345 1.98 241.88023 4.698 247.49869 10.64 301.13599 100.8 241.88 4.6979 14JB28-299 452.28 41721.45 0.887 19.731309 2.88 0.2674765 3.77 0.0382772 2.43 242.1454 5.782 240.67411 8.074 226.3427 66.527 242.145 5.7817 14JB28-028 2211.7 47796.14 2.282 14.492925 2.34 0.3657775 2.86 0.0384478 1.65 243.20467 3.94 316.51915 7.79 898.69635 48.301 243.205 3.9396 14JB28-133 589.97 156610.5 1.576 18.293616 4.22 0.2948135 5.22 0.0391152 3.08 247.34623 7.462 262.3411 12.08 398.47888 94.664 247.346 7.462 14JB28-226 1453 89719.81 69.22 19.526266 2.19 0.2810821 3.37 0.0398062 2.56 251.63181 6.33 251.51557 7.516 250.40924 50.436 251.632 6.3298 14JB28-216 577.44 72993.2 1.694 18.742635 2.93 0.293858 3.54 0.0399454 1.98 252.49462 4.903 261.5916 8.163 343.87302 66.391 252.495 4.9027 14JB28-160 244.76 78752.88 1.14 19.040827 2.82 0.2913131 4.37 0.0402295 3.33 254.25528 8.309 259.59241 10 308.03969 64.286 254.255 8.3087 14JB28-143 293.35 45894.68 0.924 18.960318 2.66 0.2941374 3.66 0.0404478 2.51 255.60791 6.293 261.81084 8.441 317.67966 60.461 255.608 6.2926 14JB28-108 713.74 114913 3.548 19.33559 2.41 0.2928098 3.37 0.0410622 2.36 259.41339 5.988 260.76867 7.747 272.94456 55.182 259.413 5.9885 14JB28-315 527.42 3450088 2.684 19.011315 3.45 0.2979649 5.44 0.0410843 4.21 259.5505 10.7 264.80942 12.69 311.60867 78.615 259.551 10.7 14JB28-190 51.158 12801.81 0.845 19.300645 7.9 0.2949154 8.45 0.0412827 3.01 260.77881 7.693 262.42106 19.54 277.13205 181.06 260.779 7.693 14JB28-278 779.96 45153.75 1.37 18.417645 2 0.3094104 2.73 0.0413302 1.85 261.07302 4.735 273.72385 6.543 383.31613 45.008 261.073 4.7352 14JB28-235 1511.7 124224.6 3.028 19.345429 1.38 0.2987786 3.32 0.0419205 3.01 264.7262 7.817 265.44576 7.746 271.77865 31.699 264.726 7.8173

172 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 14JB28-098 638.31 41546.49 1.572 19.044893 2.93 0.3070379 3.58 0.0424101 2.06 267.75463 5.393 271.88248 8.545 307.57241 66.819 267.755 5.393 14JB28-102 579.99 201545.4 1.334 19.085554 1.98 0.3071436 2.37 0.0425153 1.31 268.40498 3.434 271.96455 5.654 302.73679 45.077 268.405 3.4342 14JB28-114 1914.5 196841.3 2.112 19.403404 1.9 0.3064518 3.28 0.043126 2.67 272.18014 7.116 271.42706 7.807 264.93252 43.668 272.18 7.1158 14JB28-086 385.85 37088.53 1.043 19.377386 3.3 0.3200526 3.82 0.0449796 1.92 283.62505 5.32 281.94304 9.402 267.99315 75.776 283.625 5.3196 14JB28-229 1028.9 28813.05 3.34 19.352456 2.49 0.3206056 3.41 0.0449993 2.32 283.74684 6.453 282.36828 8.398 270.94579 57.072 283.747 6.4534 14JB28-301 197.35 20475.21 1.447 19.420154 2.48 0.3295871 3.36 0.0464218 2.27 292.51573 6.481 289.25062 8.454 262.95528 56.942 292.516 6.4807 14JB28-242 876.96 129546.4 3.314 19.264826 2.12 0.3378391 3.28 0.0472034 2.5 297.32942 7.256 295.53301 8.401 281.3839 48.517 297.329 7.2558 14JB28-090 928.07 184378.1 6.071 18.912693 2.46 0.3487518 4.61 0.0478375 3.9 301.23141 11.48 303.78185 12.11 323.42015 55.932 301.231 11.482 14JB28-022 881.44 107983.1 2.559 18.809504 1.92 0.3561978 4.25 0.0485923 3.79 305.87321 11.32 309.37203 11.32 335.82999 43.408 305.873 11.32 14JB28-303 351.26 49046.09 1.569 18.685508 2.87 0.3755762 4.22 0.0508981 3.09 320.03319 9.649 323.77795 11.69 350.77448 64.825 320.033 9.649 14JB28-313 369.74 30577.36 1.753 23.141449 2.19 0.3049898 2.77 0.0511888 1.7 321.81575 5.339 270.29009 6.582 155.33074 54.421 321.816 5.3387 14JB28-079 1011.9 72823.57 12.46 19.049728 2.22 0.3725225 5.78 0.0514683 5.33 323.52999 16.83 321.52134 15.93 306.99424 50.561 323.53 16.834 14JB28-119 677.09 106988.5 4.146 18.916551 1.83 0.3893071 2.62 0.0534113 1.88 335.43102 6.143 333.86316 7.461 322.97641 41.513 335.431 6.1431 14JB28-064 115.89 16209.81 1.647 19.517913 3.25 0.3884515 3.82 0.0549881 2.01 345.07338 6.76 333.23764 10.86 251.43804 74.775 345.073 6.7598 14JB28-316 472.59 110406.5 3.5 18.337434 1.39 0.4426007 2.7 0.0588639 2.31 368.71289 8.282 372.08462 8.406 393.11529 31.245 368.713 8.2819 14JB28-113 1116.7 89713.74 1.626 18.356839 1.84 0.4680051 3.34 0.0623085 2.78 389.64939 10.52 389.81004 10.8 390.74161 41.316 389.649 10.516 14JB28-238 240.21 28873.43 2.015 18.497971 2.64 0.4647638 3.93 0.0623527 2.92 389.91754 11.05 387.56563 12.68 373.52688 59.35 389.918 11.05 14JB28-265 3300.2 24614.29 6.603 9.2959253 3.22 0.9376941 4.19 0.0632197 2.68 395.17661 10.28 671.67453 20.6 1758.7081 58.926 395.177 10.283 14JB28-129 609.36 130251.1 0.897 17.26452 2.05 0.5071589 4.52 0.0635035 4.03 396.89669 15.5 416.53692 15.45 526.84384 44.987 396.897 15.503 14JB28-112 308.87 63358.06 3.249 17.776853 2.12 0.4976511 3.83 0.0641621 3.19 400.88789 12.4 410.11116 12.92 462.38558 46.933 400.888 12.404 14JB28-046 305.1 50311.53 1.766 18.372673 3.22 0.4824192 4.57 0.0642829 3.25 401.61973 12.67 399.73125 15.12 388.80733 72.223 401.62 12.667 14JB28-293 1381.5 64544.68 18.7 18.027023 1.88 0.5285 2.79 0.0690984 2.07 430.72129 8.606 430.8137 9.806 431.28577 41.904 430.721 8.6064 14JB28-107 443.61 42916.41 2.162 17.451997 2.73 0.5478878 3.76 0.0693483 2.59 432.22791 10.82 443.61204 13.52 503.07993 60.053 432.228 10.82 14JB28-237 1209.3 138722.6 0.81 18.035499 2.1 0.5406589 3.02 0.0707213 2.17 440.49983 9.238 438.8589 10.75 430.23834 46.755 440.5 9.2377 14JB28-048 407.19 44306.96 1.479 17.938464 2.77 0.5476064 3.44 0.0712447 2.04 443.6502 8.755 443.42744 12.38 442.2495 61.717 443.65 8.7549 14JB28-319 767.07 97927.64 1.301 17.833729 1.98 0.5530908 3.5 0.0715381 2.89 445.41553 12.43 447.01938 12.66 455.28217 43.959 445.416 12.426 14JB28-186 601.96 63327.11 1.783 17.149302 1.42 0.5776322 2.76 0.071845 2.37 447.26165 10.23 462.93863 10.26 541.4727 31.066 447.262 10.23 14JB28-289 526.1 81535.53 2.924 17.8437 1.69 0.5581125 3.13 0.072228 2.64 449.56447 11.45 450.29713 11.39 454.06193 37.591 449.564 11.446 14JB28-255 438.44 77984.92 1.009 18.012664 2.19 0.5570031 3.4 0.072767 2.6 452.8043 11.38 449.57395 12.36 433.06265 48.852 452.804 11.381 14JB28-243 639.7 243233.1 0.961 17.94096 2.01 0.5597085 3.22 0.0728293 2.52 453.179 11.01 451.3367 11.74 441.94004 44.777 453.179 11.008 14JB28-305 489.65 93308.85 22.22 17.763286 2.23 0.5693548 3.01 0.0733508 2.02 456.31177 8.879 457.59715 11.09 464.05916 49.534 456.312 8.8785 14JB28-145 693.38 86711.15 1.983 17.699938 1.28 0.5726905 3.61 0.0735175 3.37 457.3125 14.9 459.75313 13.34 471.9687 28.314 457.312 14.898 14JB28-043 521.27 41928.11 2.342 17.926031 2.45 0.5684427 3.24 0.0739043 2.13 459.63489 9.459 457.00686 11.94 443.79283 54.389 459.635 9.4593 14JB28-266 540.9 54557.17 2.253 17.552363 2.54 0.5807619 4.78 0.073932 4.05 459.80126 17.97 464.95093 17.83 490.47987 56.015 459.801 17.965 14JB28-035 905.29 202361.4 1.351 17.070634 1.65 0.5972473 2.77 0.0739439 2.22 459.87296 9.843 475.48531 10.51 551.52997 36.121 459.873 9.8434 14JB28-262 648.76 59447.79 1.602 17.671814 1.8 0.5882182 3.47 0.0753908 2.96 468.55199 13.4 469.72918 13.03 475.50445 39.715 468.552 13.396 14JB28-136 935.3 145077.5 1.429 17.386363 1.9 0.6005539 3.26 0.0757285 2.65 470.57611 12.03 477.58515 12.42 511.40692 41.681 470.576 12.034 14JB28-094 628.79 51126.28 1.758 17.754357 2.36 0.5886392 3.46 0.0757972 2.53 470.98741 11.5 469.99829 13.02 465.14943 52.271 470.987 11.503 14JB28-251 757.68 225962.8 1.337 17.354438 2.08 0.6373315 3.34 0.0802185 2.62 497.42695 12.53 500.65266 13.21 515.40267 45.647 497.427 12.532 14JB28-074 535.97 27142.75 5.243 16.850816 2.05 0.6669573 3.21 0.0815113 2.48 505.1371 12.04 518.86072 13.06 579.75142 44.455 505.137 12.044 14JB28-276 907.96 75818.98 2.726 16.182931 1.38 0.8786258 3 0.103124 2.66 632.6909 16.03 640.24019 14.24 666.96709 29.608 632.691 16.027 14JB28-168 937.43 78655.17 15.14 16.376111 1.36 0.8916268 3.25 0.1058992 2.95 648.88799 18.23 647.24295 15.57 641.52898 29.331 648.888 18.234 14JB28-081 872.33 139499.2 16.87 15.69656 1.34 0.9808686 3.67 0.1116642 3.42 682.40576 22.12 694.0503 18.46 731.97781 28.43 682.406 22.124 14JB28-091 564.08 110701.8 2.132 15.588486 1.32 1.0688589 2.26 0.1208434 1.84 735.41633 12.78 738.18062 11.86 746.55795 27.834 735.416 12.778 14JB28-290 489.29 81625.61 1.113 14.964912 1.97 1.1178371 3.47 0.1213253 2.85 738.18725 19.91 761.9387 18.61 832.28074 41.172 738.187 19.912 14JB28-007 153.85 37996.05 1.431 15.124414 2.81 1.1265712 5.47 0.1235765 4.69 751.11627 33.23 766.11761 29.41 810.10142 58.855 751.116 33.23 14JB28-167 508.86 126354.9 4.725 15.034304 2.07 1.1408686 3.04 0.1243992 2.22 755.83479 15.81 772.92138 16.42 822.63009 43.309 755.835 15.808 14JB28-124 324.33 71649.22 2.739 15.571759 2.31 1.1056749 3.03 0.1248717 1.96 758.54275 14.02 756.09082 16.15 748.82606 48.818 758.543 14.023 14JB28-92 248.33 44544.14 1.523 15.680102 1.81 1.1158408 2.98 0.1268966 2.37 770.1366 17.17 760.98112 15.95 734.20051 38.295 770.137 17.169 14JB28-t257 576.43 152130.7 0.619 15.24621 1.81 1.1476227 3.46 0.1268995 2.95 770.1532 21.42 776.11972 18.77 793.30106 37.869 770.153 21.419 14JB28-59 274.59 91094.88 0.832 15.296816 1.4 1.1442499 2.82 0.1269465 2.45 770.42218 17.77 774.52383 15.28 786.34692 29.46 770.422 17.773 14JB28-9 1199.8 54600.89 2.059 15.297797 1.33 1.1483149 4 0.1274056 3.78 773.04813 27.52 776.44695 21.74 786.21226 27.932 773.048 27.518 14JB28-99 353.65 79225.58 2.034 14.7707 2.52 1.1981212 4.01 0.1283514 3.12 778.4536 22.87 799.71874 22.2 859.41188 52.365 778.454 22.867 14JB28-104 541.05 52892.18 1.952 15.378314 1.83 1.151493 2.91 0.1284307 2.25 778.90654 16.54 777.94793 15.79 775.17776 38.556 778.907 16.538 14JB28-282 416.2 62571.15 0.416 15.375236 1.85 1.1520476 3.29 0.1284668 2.72 779.11304 19.97 778.20966 17.89 775.59873 38.918 779.113 19.969 14JB28-25 572.06 48208.76 0.741 15.023368 1.68 1.1832801 2.93 0.1289299 2.41 781.75781 17.71 792.8399 16.14 824.14827 35.041 781.758 17.708 14JB28-162 689.88 319285.2 1.727 15.321263 2.69 1.1641124 3.9 0.1293565 2.82 784.19331 20.81 783.88616 21.29 782.9929 56.546 784.193 20.814 14JB28-156 246.85 41407.49 1.047 15.149431 1.67 1.1778774 3.09 0.1294181 2.6 784.5452 19.19 790.32413 16.95 806.64316 34.883 784.545 19.186 14JB28-131 159.23 72371.58 1.687 15.368967 1.81 1.1629904 3.14 0.1296342 2.57 785.77821 19.01 783.3596 17.16 776.45649 38.061 785.778 19.014 14JB28-291 233.39 122288.2 1.006 15.117093 2.35 1.1893072 3.35 0.130395 2.39 790.11872 17.75 795.63909 18.48 811.15342 49.147 790.119 17.747 14JB28-277 83.505 158216.6 22.24 15.381668 6.07 1.1744153 8.63 0.1310159 6.13 793.65811 45.8 788.70873 47.35 774.719 127.75 793.658 45.8 14JB28-147 61.29 49192.23 1.374 15.250613 4.87 1.1865573 5.22 0.1312426 1.88 794.95021 14.04 794.3629 28.76 792.69546 102.18 794.95 14.039 14JB28-233 224.74 226238.7 1.347 15.078584 1.42 1.2003094 5.31 0.1312661 5.11 795.08411 38.25 800.72903 29.41 816.48807 29.701 795.084 38.255 14JB28-244 137.82 73690.09 1.017 14.796099 2.87 1.2279219 3.94 0.1317701 2.7 797.95536 20.25 813.39216 22.06 855.84498 59.678 797.955 20.25 14JB28-115 794.41 235986 4.798 15.075846 1.76 1.2060738 3.37 0.1318725 2.87 798.53899 21.58 803.38567 18.7 816.86643 36.717 798.539 21.585 14JB28-189 692.09 144589.7 0.923 14.645879 1.89 1.2532571 4.24 0.1331234 3.79 805.65916 28.71 824.87361 23.94 877.00333 39.231 805.659 28.712 14JB28-239 1322.7 150589 7.371 14.291968 1.62 1.2862191 3.38 0.1333232 2.97 806.79576 22.52 839.61963 19.31 927.43605 33.185 806.796 22.517 14JB28-125 190.6 45059.86 1.486 15.396934 1.59 1.1945668 3.1 0.1333962 2.66 807.21097 20.16 798.07551 17.13 772.63184 33.553 807.211 20.161 14JB28-36 416.92 121540.7 2.009 15.288205 1.68 1.2090656 3.28 0.1340618 2.82 810.99571 21.47 804.76175 18.24 787.52915 35.346 810.996 21.473 14JB28-196 461.2 111539.6 9.765 15.001994 1.64 1.241727 6.66 0.1351058 6.46 816.92715 49.53 819.66447 37.47 827.07966 34.196 816.927 49.529 14JB28-284 230.81 78090.42 1.625 15.325819 2.03 1.2167301 4.46 0.1352436 3.97 817.70983 30.46 808.27861 24.84 782.36831 42.667 817.71 30.46 14JB28-310 482.93 121568.7 0.956 15.183898 2.03 1.2291482 4.96 0.1353587 4.53 818.36362 34.83 813.95087 27.8 801.88497 42.461 818.364 34.827 14JB28-221 317.54 145896 1.751 14.042391 3.4 1.3294701 3.87 0.1353999 1.84 818.59747 14.13 858.64936 22.42 963.5511 69.515 818.597 14.128 14JB28-254 623.65 61659.32 1.245 14.691749 1.74 1.274043 3.16 0.1357551 2.64 820.61408 20.31 834.19738 17.97 870.52992 36.054 820.614 20.309 14JB28-151 337.03 39336.23 1.551 15.099411 1.66 1.2445966 3.04 0.1362973 2.54 823.6907 19.66 820.96343 17.1 813.60088 34.76 823.691 19.657 14JB28-232 223.32 92876.01 1.055 14.63017 2.21 1.3149723 4.8 0.1395291 4.26 841.99894 33.61 852.31024 27.67 879.26318 45.686 841.999 33.612 14JB28-197 336.86 55646.47 2.468 14.824921 1.49 1.3112147 2.18 0.1409824 1.6 850.21532 12.71 850.66074 12.56 851.81583 30.895 850.215 12.705

173 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 14JB28-210 343.55 119826.5 1.972 14.428348 2.13 1.3571919 3.33 0.1420223 2.56 856.08804 20.55 870.66157 19.49 907.90218 43.859 856.088 20.552 14JB28-178 1047.5 201513.6 1.786 14.425247 2.12 1.3682467 4.15 0.1431484 3.57 862.44118 28.83 875.41241 24.36 908.34415 43.576 862.441 28.829 14JB28-121 793.12 147147.8 4.911 14.608755 1.11 1.3729091 2.82 0.1454634 2.59 875.48274 21.18 877.40941 16.54 882.2939 22.959 875.483 21.18 14JB28-241 474.25 84620.34 140.5 14.558189 1.7 1.3960308 2.7 0.1474012 2.1 886.37925 17.41 887.25546 15.98 889.44685 35.044 886.379 17.408 14JB28-286 230.21 35006.79 2.002 14.585521 2.55 1.4046816 3.55 0.1485931 2.47 893.07194 20.59 890.91487 21.04 885.54488 52.617 893.072 20.593 14JB28-18 529.55 128791.9 4.311 14.234164 1.59 1.529599 2.54 0.1579095 1.98 945.14899 17.43 942.33722 15.6 935.75338 32.595 935.753 32.595 14JB28-217 779.22 54338.75 4.779 14.178443 1.23 1.6123487 2.87 0.1658007 2.59 988.93222 23.73 975.02128 17.97 943.82415 25.235 943.824 25.235 14JB28-135 756.31 191520.2 3.403 14.137646 1.63 1.5880325 4.88 0.1628303 4.6 972.48631 41.55 965.52564 30.43 949.70393 33.351 949.704 33.351 14JB28-209 868.77 207080.7 5.589 14.130506 1.54 1.5434639 3.26 0.1581805 2.87 946.65744 25.3 947.8874 20.1 950.73754 31.593 950.738 31.593 14JB28-295 198.65 192538.1 0.599 14.049125 2.88 1.5910354 3.72 0.1621167 2.36 968.52929 21.21 966.7031 23.23 962.57332 58.885 962.573 58.885 14JB28-327 1678.6 185760.3 7.237 14.000515 1.51 1.4989681 2.45 0.1522072 1.93 913.32401 16.44 929.9669 14.92 969.62843 30.747 969.628 30.747 14JB28-222 344.81 56685.38 2.002 13.933486 1.88 1.6389716 4.5 0.1656265 4.09 987.96932 37.48 985.31683 28.4 979.39352 38.269 979.394 38.269 14JB28-155 900.71 147624 2.181 13.928082 1.82 1.6648533 3.81 0.1681768 3.35 1002.0578 31.07 995.22669 24.18 980.18493 37.144 980.185 37.144 14JB28-14 747.45 725704.4 2.689 13.927594 1.28 1.5715084 2.74 0.1587419 2.43 949.78132 21.44 959.02182 17.03 980.25555 26.042 980.256 26.042 14JB28-158 422.51 247545.7 0.709 13.838 1.5 1.6522968 2.64 0.1658288 2.17 989.08811 19.93 990.431 16.7 993.39851 30.443 993.399 30.443 14JB28-176 103.09 130234.9 0.716 13.810148 2.86 1.6360937 3.99 0.1638722 2.78 978.25967 25.21 984.20894 25.13 997.4823 58.152 997.482 58.152 14JB28-123 1289.4 591306.7 6.58 13.783746 1.78 1.5731952 3.25 0.157271 2.72 941.59312 23.84 959.68767 20.2 1001.3694 36.214 1001.37 36.214 14JB28-309 1112.2 90580.21 2.963 13.75436 2.19 1.6494122 3.9 0.1645388 3.23 981.95086 29.39 989.32611 24.67 1005.7002 44.49 1005.7 44.49 14JB28-247 1323.4 119336.6 2.079 13.635659 1.44 1.6498804 2.71 0.1631651 2.3 974.34228 20.81 989.50553 17.16 1023.2653 29.109 1023.27 29.109 14JB28-44 448.37 112539.4 5.211 13.603394 1.77 1.6353377 3.17 0.1613442 2.63 964.24273 23.59 983.91768 20.01 1028.0574 35.835 1028.06 35.835 14JB28-268 1504.9 161543 6.333 13.507541 1.6 1.6214134 2.79 0.1588433 2.29 950.34534 20.2 978.53851 17.53 1042.3402 32.339 1042.34 32.339 14JB28-215 562.78 63496.61 2.667 13.498256 2.1 1.6672265 3.63 0.1632191 2.96 974.6414 26.81 996.13053 23.07 1043.7272 42.407 1043.73 42.407 14JB28-218 345 67690.21 2.635 13.478288 1.93 1.6257236 3.12 0.1589206 2.45 950.7755 21.65 980.20666 19.59 1046.7521 38.847 1046.75 38.847 14JB28-45 541.82 65712.88 2.915 13.27785 2.03 1.9335357 3.26 0.1861996 2.55 1100.7546 25.82 1092.7638 21.84 1076.8969 40.822 1076.9 40.822 14JB28-27 273.45 62307.17 1.773 13.222994 1.64 1.7623377 2.86 0.1690121 2.34 1006.6655 21.85 1031.7077 18.55 1085.1842 32.957 1085.18 32.957 14JB28-285 860.79 181893.1 0.316 13.027588 1.57 1.9333342 2.56 0.182671 2.03 1081.5502 20.2 1092.6941 17.16 1114.9462 31.306 1114.95 31.306 14JB28-169 1713.8 123951.6 1.54 12.827133 1.57 2.0103267 2.82 0.187023 2.34 1105.2279 23.74 1119.0015 19.09 1145.8662 31.223 1145.87 31.223 14JB28-166 484.77 247372.1 2.751 12.793694 1.99 2.1593353 3.88 0.2003617 3.33 1177.2632 35.8 1168.0577 26.91 1151.0421 39.497 1151.04 39.497 14JB28-69 330.69 56641.67 1.559 12.755008 1.68 2.0301476 3.3 0.187805 2.84 1109.4733 28.96 1125.6652 22.45 1157.0239 33.255 1157.02 33.255 14JB28-52 472.1 65563.13 0.888 12.725191 2.63 1.8886507 3.88 0.1743069 2.86 1035.7978 27.39 1077.1077 25.79 1161.6644 52.063 1161.66 52.063 14JB28-134 976.58 275758 6.321 12.546253 1.92 2.0592001 2.87 0.1873749 2.13 1107.1386 21.7 1135.3541 19.61 1189.7182 37.883 1189.72 37.883 14JB28-139 792.91 244915.4 1.421 12.444543 1.3 2.1924308 4.23 0.1978808 4.02 1163.9256 42.85 1178.639 29.5 1205.7324 25.624 1205.73 25.624 14JB28-270 1280.4 225000.8 1.634 12.417558 1.14 1.9245109 3.13 0.1733226 2.92 1030.3922 27.79 1089.6352 20.93 1210.0191 22.367 1210.02 22.367 14JB28-204 490.31 140274.4 1.791 12.252479 1.3 2.2921086 2.5 0.2036845 2.13 1195.0829 23.23 1209.8576 17.65 1236.3386 25.541 1236.34 25.541 14JB28-57 93.86 68832.82 2.731 12.243317 2.34 2.2588989 3.77 0.2005832 2.96 1178.4526 31.87 1199.5628 26.55 1237.8055 45.835 1237.81 45.835 14JB28-234 565.54 5113045 1.3 12.168549 1.3 2.3781183 2.75 0.20988 2.42 1228.1783 27.04 1236.0449 19.63 1249.8064 25.484 1249.81 25.484 14JB28-101 866.06 233603.3 10.18 12.147862 1.34 2.5374231 2.3 0.2235586 1.87 1300.6513 22.08 1282.8335 16.78 1253.0993 26.169 1253.1 26.169 14JB28-250 2376.2 187410.7 19.35 12.089299 1.07 2.3834981 2.35 0.2089848 2.09 1223.4068 23.33 1237.6607 16.82 1262.5834 20.893 1262.58 20.893 14JB28-274 510.06 225878.6 1.43 12.0544 1.49 2.5630578 2.49 0.2240798 2 1303.3966 23.56 1290.1651 18.19 1268.2211 29.061 1268.22 29.061 14JB28-307 1043.4 122938.6 7.462 11.717387 1.5 2.4745973 2.71 0.2102975 2.26 1230.4024 25.26 1264.6379 19.6 1323.3314 29.121 1323.33 29.121 14JB28-294 554.9 98554.51 3.204 11.641865 1.41 2.6670853 2.42 0.2251947 1.97 1309.2653 23.3 1319.3858 17.86 1335.8453 27.193 1335.85 27.193 14JB28-16 274.61 104905 1.359 11.434367 1.33 2.926839 2.97 0.2427223 2.66 1400.8341 33.43 1388.8763 22.49 1370.5371 25.651 1370.54 25.651 14JB28-111 1140.4 60720.08 2.367 11.310891 1.29 2.8218398 3.53 0.2314877 3.28 1342.2913 39.78 1361.3565 26.45 1391.3988 24.774 1391.4 24.774 14JB28-47 299.21 116402.7 2.185 11.193471 1.93 2.8827629 2.95 0.2340305 2.23 1355.5883 27.3 1377.4148 22.25 1411.3937 36.938 1411.39 36.938 14JB28-11 579.53 150929.8 2.26 10.711903 1.7 3.1365952 2.72 0.2436822 2.11 1405.8114 26.71 1441.715 20.91 1495.0641 32.242 1495.06 32.242 14JB28-66 990.08 795434.3 1.999 10.609129 1.43 3.33763 2.52 0.2568128 2.07 1473.5148 27.3 1489.9001 19.67 1513.2823 26.982 1513.28 26.982 14JB28-308 962.02 116164.9 33.48 10.575365 1.25 3.5450373 1.95 0.2719036 1.5 1550.4571 20.66 1537.3264 15.46 1519.293 23.578 1519.29 23.578 14JB28-33 779.82 166344.8 0.717 10.280646 1.21 3.8161853 1.91 0.2845434 1.48 1614.2037 21.19 1596.1641 15.4 1572.4107 22.633 1572.41 22.633 14JB28-141 623.51 258572.5 0.989 10.099902 1.47 3.229165 3.94 0.2365408 3.66 1368.6887 45.15 1464.187 30.58 1605.554 27.322 1605.55 27.322 14JB28-5 390.95 132797.7 1.965 9.9809228 1.63 3.846998 2.64 0.2784783 2.07 1583.6941 29.1 1602.6395 21.27 1627.6163 30.396 1627.62 30.396 14JB28-137 645.3 1602220 1.604 9.9286448 1.31 4.1535777 2.77 0.2990963 2.45 1686.8259 36.3 1664.9146 22.7 1637.375 24.294 1637.37 24.294 14JB28-51 61.214 30225.4 5.303 9.9283587 2.69 3.8596798 5.08 0.2779249 4.31 1580.9031 60.38 1605.2927 40.97 1637.4285 49.942 1637.43 49.942 14JB28-71 226.88 63756.92 1.25 9.9187291 1.81 4.0998355 2.66 0.2949315 1.94 1666.1261 28.52 1654.2705 21.7 1639.2303 33.671 1639.23 33.671 14JB28-110 442.01 110904.9 1.335 9.8905842 1.91 4.0798001 3.33 0.2926574 2.72 1654.7953 39.7 1650.2736 27.13 1644.5043 35.507 1644.5 35.507 14JB28-30 1079.9 136264.5 39.68 9.8835986 1.6 3.2764286 3.32 0.234863 2.91 1359.9355 35.67 1475.4716 25.83 1645.8151 29.679 1645.82 29.679 14JB28-62 68.174 39202.17 1.183 9.7677694 2.47 4.1779665 4.43 0.2959778 3.67 1671.3324 54.09 1669.7085 36.28 1667.6496 45.648 1667.65 45.648 14JB28-117 160.17 61969.45 0.917 9.6591585 1.62 4.1885078 2.64 0.2934252 2.09 1658.6228 30.59 1671.7735 21.67 1688.3071 29.837 1688.31 29.837 14JB28-223 760.9 86792.99 0.9 9.5024947 1.47 4.118503 2.6 0.2838414 2.15 1610.6797 30.62 1657.9804 21.27 1718.4167 26.996 1718.42 26.996 14JB28-279 607.39 233889 1.655 9.2804419 1.62 4.5623645 3.05 0.3070841 2.58 1726.3419 39.1 1742.421 25.39 1761.7562 29.617 1761.76 29.617 14JB28-120 2046.7 67259.92 3.107 9.1416626 1.62 4.364269 2.76 0.289358 2.24 1638.32 32.36 1705.6 22.83 1789.2497 29.565 1789.25 29.565 14JB28-60 769.29 51326.29 6.085 9.1125514 1.57 4.0510363 2.94 0.2677348 2.49 1529.2938 33.92 1644.5077 23.97 1795.0587 28.494 1795.06 28.494 14JB28-13 197.16 63190.33 1.775 9.0184192 1.69 4.9790831 2.87 0.3256706 2.32 1817.3629 36.74 1815.7762 24.27 1813.9413 30.707 1813.94 30.707 14JB28-34 630.06 180246.9 2.438 8.955984 1.61 4.4704336 3.13 0.2903766 2.69 1643.4111 38.96 1725.4992 25.98 1826.5467 29.158 1826.55 29.158 14JB28-283 486.56 136065.8 5.043 8.9528985 1.74 4.5738043 2.73 0.2969887 2.1 1676.3591 31.01 1744.5071 22.74 1827.1717 31.577 1827.17 31.577 14JB28-37 421.48 102083.2 4.544 8.9220785 2 4.4229078 3.3 0.286202 2.63 1622.5217 37.74 1716.6392 27.38 1833.4228 36.241 1833.42 36.241 14JB28-77 169.17 63090.92 1.15 8.9214169 1.9 4.9898077 2.81 0.3228616 2.08 1803.689 32.69 1817.5959 23.81 1833.5572 34.39 1833.56 34.39 14JB28-280 446.85 110626.3 1.267 8.9111704 1.47 4.1772383 3.56 0.2699745 3.24 1540.6724 44.43 1669.5657 29.17 1835.6393 26.637 1835.64 26.637 14JB28-227 485.04 214917.7 5.148 8.907332 1.69 5.1930322 3.2 0.3354806 2.72 1864.891 44.05 1851.4747 27.29 1836.4198 30.686 1836.42 30.686 14JB28-83 911.46 58158.93 1.768 8.9049024 1.51 4.8416922 3.13 0.312698 2.74 1753.9696 42.02 1792.1719 26.31 1836.9139 27.373 1836.91 27.373 14JB28-20 1879.8 184343.3 53.08 8.8900967 1.4 5.0857086 2.85 0.3279115 2.48 1828.2509 39.51 1833.7241 24.21 1839.9275 25.43 1839.93 25.43 14JB28-127 212.33 102626.1 1.615 8.8805296 1.81 5.0793805 2.97 0.3271511 2.35 1824.5582 37.35 1832.6677 25.18 1841.8768 32.807 1841.88 32.807 14JB28-175 528.41 87914.88 1.965 8.8733371 1.33 5.1259986 2.41 0.3298862 2.01 1837.8301 32.14 1840.4242 20.46 1843.3434 24 1843.34 24 14JB28-208 89.63 34117.26 1.277 8.8709786 2.01 5.0945759 2.74 0.3277769 1.87 1827.5972 29.78 1835.2025 23.3 1843.8245 36.328 1843.82 36.328 14JB28-326 558.82 562974.1 5.499 8.8537319 1.6 5.1079553 2.33 0.3279987 1.7 1828.6743 27.02 1837.4291 19.83 1847.3457 29.004 1847.35 29.004 14JB28-288 183.81 52897.45 0.922 8.8333494 1.64 4.951768 2.82 0.3172374 2.29 1776.2236 35.56 1811.1269 23.81 1851.5141 29.679 1851.51 29.679 14JB28-23 757.25 217014.1 9.632 8.8327822 1.5 5.1339228 2.97 0.3288861 2.56 1832.9805 40.92 1841.7368 25.26 1851.6302 27.138 1851.63 27.138 14JB28-130 300.69 90662.08 1.807 8.8322888 1.82 5.1860602 3 0.3322076 2.39 1849.0727 38.38 1850.3309 25.58 1851.7312 32.986 1851.73 32.986

174 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 14JB28-58 346.96 75573.63 2.208 8.817379 0.98 5.1275134 2.3 0.3279027 2.08 1828.2082 33.14 1840.6752 19.57 1854.7816 17.801 1854.78 17.801 14JB28-75 242.25 199262.6 3.565 8.809724 1.29 5.3704537 2.79 0.3431405 2.47 1901.7602 40.71 1880.155 23.89 1856.3513 23.388 1856.35 23.388 14JB28-3 749.47 70955.09 3.396 8.8020618 1.33 4.7005933 2.74 0.3000791 2.39 1691.7012 35.59 1767.3455 22.91 1857.9235 23.995 1857.92 23.995 14JB28-142 504.74 60481.85 3.032 8.7943774 1.57 5.2632771 2.35 0.3357067 1.74 1865.9826 28.26 1862.9269 20.03 1859.5013 28.377 1859.5 28.377 14JB28-138 417.04 71279.42 2.233 8.7916307 1.62 5.4080715 3.72 0.3448344 3.35 1909.8848 55.42 1886.1333 31.91 1860.0656 29.229 1860.07 29.229 14JB28-179 1165.2 67772.07 85.67 8.7863621 1.55 4.6449832 2.99 0.2960002 2.55 1671.4439 37.55 1757.3917 24.96 1861.1483 28.062 1861.15 28.062 14JB28-41 668.13 190304.7 10.45 8.7808836 1.85 5.4613336 2.84 0.3478049 2.16 1924.1079 35.87 1894.538 24.4 1862.2747 33.424 1862.27 33.424 14JB28-323 557.12 157438.2 5.766 8.7652466 2.21 5.30776 3.19 0.3374226 2.3 1874.2583 37.42 1870.1128 27.29 1865.4926 39.977 1865.49 39.977 14JB28-10 1112 144366.9 88.53 8.7530147 1.81 4.8361085 3.23 0.3070099 2.67 1725.976 40.42 1791.2009 27.15 1868.013 32.701 1868.01 32.701 14JB28-314 2356.8 991189.1 2.883 8.7367999 1.52 5.0829376 2.66 0.3220816 2.18 1799.8869 34.3 1833.2617 22.58 1871.3582 27.419 1871.36 27.419 14JB28-67 838.38 91834.86 9.483 8.7308861 1.51 4.4643771 3.29 0.2826949 2.92 1604.9201 41.52 1724.3744 27.31 1872.5795 27.316 1872.58 27.316 14JB28-192 796.66 203077.7 3.102 8.7277912 1.46 4.4923789 3.4 0.2843672 3.07 1613.3191 43.84 1729.5644 28.24 1873.2189 26.277 1873.22 26.277 14JB28-317 451.7 103415.2 2.417 8.7239389 1.18 4.7845966 2.12 0.3027308 1.76 1704.8361 26.38 1782.1989 17.82 1874.015 21.319 1874.02 21.319 14JB28-171 487.61 57403.92 3.131 8.7150936 1.88 5.2770192 3.1 0.3335489 2.47 1855.5597 39.75 1865.1523 26.48 1875.844 33.943 1875.84 33.943 14JB28-236 1127.6 96257.7 18.4 8.7144508 1.19 5.354878 3.8 0.3384452 3.61 1879.1853 58.82 1877.6694 32.53 1875.977 21.515 1875.98 21.515 14JB28-263 839.42 79706 52.78 8.7093563 1.4 5.3105546 2.63 0.3354476 2.23 1864.7317 36.06 1870.5626 22.48 1877.0312 25.221 1877.03 25.221 14JB28-50 281.13 116880.4 0.904 8.7022939 1.54 5.1785885 2.94 0.3268465 2.5 1823.0788 39.78 1849.1038 25.03 1878.4933 27.743 1878.49 27.743 14JB28-109 307.66 92566.96 3.062 8.6886411 1.34 5.3645862 2.49 0.3380546 2.1 1877.3038 34.17 1879.2194 21.29 1881.3226 24.062 1881.32 24.062 14JB28-248 670.7 2153897 2.939 8.6817196 1.61 5.3352697 2.77 0.3359393 2.26 1867.105 36.64 1874.5315 23.73 1882.7582 28.98 1882.76 28.98 14JB28-269 399.18 171475 1.594 8.6741574 1.43 5.3449726 3.09 0.3362571 2.75 1868.6383 44.53 1876.0855 26.47 1884.3278 25.704 1884.33 25.704 14JB28-267 691.98 96275.85 3.626 8.6673576 1.16 5.4417027 2.83 0.3420741 2.58 1896.64 42.34 1891.4483 24.25 1885.74 20.933 1885.74 20.933 14JB28-15 582.56 62715.76 2.831 8.6648652 1.56 5.4173062 2.86 0.3404426 2.39 1888.7985 39.21 1887.5955 24.52 1886.2579 28.142 1886.26 28.142 14JB28-202 663.06 123034.3 2.521 8.662232 1.85 5.3725109 3.31 0.3375249 2.74 1874.7515 44.63 1880.4829 28.31 1886.8051 33.22 1886.81 33.22 14JB28-328 394.44 92492.5 4.426 8.6609812 1.24 4.9597279 3.8 0.3115471 3.59 1748.3153 54.97 1812.484 32.09 1887.0651 22.289 1887.07 22.289 14JB28-118 237.24 514909.2 3.481 8.657575 1.39 4.8689439 2.29 0.3057242 1.81 1719.6313 27.39 1796.8977 19.26 1887.7732 25.033 1887.77 25.033 14JB28-128 802.19 239170.2 2.372 8.6305101 1.4 5.3508055 2.72 0.3349302 2.33 1862.2339 37.73 1877.0185 23.27 1893.4041 25.14 1893.4 25.14 14JB28-264 510.08 428027.3 4.917 8.6287962 1.81 5.6099524 4.94 0.3510816 4.6 1939.7614 77.06 1917.6285 42.63 1893.7614 32.577 1893.76 32.577 14JB28-72 193.73 51447.36 2.193 8.6242135 1.64 5.5645537 2.82 0.3480556 2.3 1925.3068 38.26 1910.6306 24.29 1894.717 29.426 1894.72 29.426 14JB28-140 1082.8 65329.56 2.349 8.6175734 1.54 5.4627287 2.72 0.3414234 2.25 1893.5138 36.89 1894.7572 23.39 1896.1024 27.688 1896.1 27.688 14JB28-177 756.56 99021.15 3.77 8.6098941 1.9 5.2529767 2.94 0.3280213 2.25 1828.7837 35.77 1861.2556 25.1 1897.7056 34.149 1897.71 34.149 14JB28-4 1056 270048.4 5.801 8.6055614 1.24 4.6772545 3.12 0.2919234 2.86 1651.1338 41.63 1763.1799 26.07 1898.6106 22.312 1898.61 22.312 14JB28-275 804.58 74723.56 9.065 8.6046402 1.27 5.6542565 3.69 0.3528637 3.47 1948.2584 58.29 1924.4116 31.87 1898.8031 22.874 1898.8 22.874 14JB28-163 1020.5 470228.2 2.346 8.5918224 2.02 5.3788291 3.54 0.3351751 2.91 1863.4163 47.04 1881.4891 30.3 1901.4828 36.248 1901.48 36.248 14JB28-230 669.5 61257.06 2.108 8.555474 1.33 5.7063813 2.19 0.3540818 1.74 1954.0601 29.27 1932.3344 18.88 1909.0991 23.821 1909.1 23.821 14JB28-21 301.93 54085.2 4.268 8.5548211 1.45 5.6616639 2.71 0.3512803 2.3 1940.709 38.47 1925.5412 23.43 1909.2361 26.006 1909.24 26.006 14JB28-329 680.74 148243.7 4.024 8.5424082 1.92 4.3339492 3.29 0.2685115 2.68 1533.2419 36.54 1699.8446 27.17 1911.8431 34.392 1911.84 34.392 14JB28-93 313.99 113489.7 1.174 8.5408945 2.05 5.5098669 2.66 0.3413054 1.69 1892.9466 27.72 1902.1364 22.84 1912.1612 36.82 1912.16 36.82 14JB28-318 292.89 71270.5 2.485 8.4873695 2.16 5.3946491 3.87 0.3320741 3.2 1848.4269 51.48 1884.0042 33.13 1923.4381 38.799 1923.44 38.799 14JB28-172 1514 272770.9 3.971 8.4568227 1.81 5.4682346 3.28 0.3353923 2.73 1864.4648 44.22 1895.6219 28.14 1929.895 32.464 1929.89 32.464 14JB28-82 180.13 60121.19 1.28 8.4401071 1.41 5.4604402 1.85 0.3342523 1.2 1858.9591 19.38 1894.3976 15.89 1933.4383 25.253 1933.44 25.253 14JB28-214 2709.8 220002.5 0.912 8.4361432 1.44 5.4136242 2.78 0.3312308 2.37 1844.3447 38.06 1887.0128 23.79 1934.2794 25.768 1934.28 25.768 14JB28-84 807.18 225866.8 1.936 8.3828106 1.3 5.7716002 2.59 0.350901 2.24 1938.8995 37.59 1942.1612 22.45 1945.6259 23.212 1945.63 23.212 14JB28-97 366.18 56969.9 7.419 8.378553 1.36 5.8324256 2.7 0.354419 2.34 1955.6651 39.44 1951.2411 23.44 1946.5342 24.271 1946.53 24.271 14JB28-40 693.85 204526.5 11.11 8.3746759 1.93 5.7506555 3.54 0.3492883 2.97 1931.1993 49.48 1939.0157 30.6 1947.3616 34.457 1947.36 34.457 14JB28-39 880.97 55076.78 2.498 8.3352409 1.73 4.8221042 3.02 0.29151 2.47 1649.0707 35.96 1788.7615 25.37 1955.7945 30.878 1955.79 30.878 14JB28-330 156.76 84834.18 0.632 8.302477 2.04 6.0788226 2.9 0.3660378 2.06 2010.7294 35.6 1987.2139 25.27 1962.8248 36.348 1962.82 36.348 14JB28-185 650.43 74123.21 2.233 8.2457806 1.73 5.9520899 3.53 0.355959 3.08 1962.9908 52.14 1968.8707 30.72 1975.0387 30.771 1975.04 30.771 14JB28-78 52.725 73804.75 2.834 8.2416399 1.92 5.9982069 3.25 0.3585369 2.62 1975.2347 44.61 1975.5841 28.27 1975.9336 34.14 1975.93 34.14 14JB28-324 710.6 138429.4 1.232 8.1830931 1.92 5.5072687 3.61 0.326853 3.05 1823.1103 48.49 1901.731 30.99 1988.6252 34.107 1988.63 34.107 14JB28-126 568.51 165213.3 1.977 8.1813484 1.49 6.2445645 3.02 0.370532 2.63 2031.9034 45.83 2010.7138 26.45 1989.0046 26.485 1989 26.485 14JB28-89 1181.9 132997.8 3.107 8.1482744 1.5 4.8703218 2.76 0.2878207 2.32 1630.6296 33.41 1797.1361 23.26 1996.2073 26.641 1996.21 26.641 14JB28-213 847.85 112481.3 14.8 8.0962351 1.68 5.1595012 2.84 0.302963 2.29 1705.9847 34.3 1845.9621 24.14 2007.5833 29.803 2007.58 29.803 14JB28-211 1254.3 164840.9 1.345 8.0535285 1.54 5.7842279 3.34 0.337855 2.96 1876.3421 48.22 1944.0529 28.89 2016.9661 27.232 2016.97 27.232 14JB28-273 1386.3 156713.4 2.37 8.0235299 2.53 5.6095963 3.49 0.3264343 2.39 1821.0758 37.99 1917.5738 30.06 2023.5806 44.911 2023.58 44.911 14JB28-258 718.42 130462.2 1.686 8.0057388 1.55 6.274122 4.44 0.3642949 4.16 2002.4996 71.63 2014.8481 38.92 2027.5127 27.496 2027.51 27.496 14JB28-159 919.88 45748.28 1.088 7.7275056 1.11 6.0291636 2.18 0.3379054 1.87 1876.585 30.5 1980.0657 18.97 2089.9243 19.537 2089.92 19.537 14JB28-322 980.07 192124.5 2.319 7.7192493 1.33 6.3133582 3.38 0.3534551 3.1 1951.0758 52.21 2020.3103 29.6 2091.8038 23.438 2091.8 23.438 14JB28-54 360.73 1486604 3.158 7.6832972 1.44 6.7481897 2.96 0.3760397 2.58 2057.757 45.51 2078.9554 26.18 2100.0071 25.361 2100.01 25.361 14JB28-149 665.9 56483.55 23.27 7.6213867 1.38 5.5484319 2 0.3066924 1.44 1724.4096 21.85 1908.1339 17.21 2114.2014 24.272 2114.2 24.272 14JB28-198 738.54 65156.36 2.475 7.5568852 1.6 7.3991082 2.28 0.4055281 1.62 2194.4438 30.16 2160.8626 20.4 2129.0936 28.07 2129.09 28.07 14JB28-96 425.89 55595.51 5.783 7.5237913 1.17 6.3364106 3.08 0.3457632 2.85 1914.3355 47.21 2023.5058 27.04 2136.774 20.549 2136.77 20.549 14JB28-300 151.29 175155.4 1.386 7.398945 1.66 6.9153806 3 0.3710946 2.5 2034.5488 43.67 2100.6324 26.64 2165.991 28.9 2165.99 28.9 14JB28-153 931.9 176922.4 2.519 7.32173 1.78 6.9614258 5.11 0.369667 4.79 2027.8331 83.28 2106.5219 45.37 2184.2637 30.99 2184.26 30.99 14JB28-187 276.58 219835.9 2.949 7.3131174 1.65 6.4615173 3.91 0.3427171 3.54 1899.7277 58.27 2040.675 34.37 2186.3115 28.706 2186.31 28.706 14JB28-292 596 240464.5 1.376 7.2742093 2.26 7.2161886 3.13 0.3807083 2.17 2079.5917 38.56 2138.5048 27.93 2195.5825 39.234 2195.58 39.234 14JB28-188 180 244023.2 1.446 6.9559631 1.67 8.3488651 4.8 0.4211952 4.5 2265.9031 86.02 2269.64 43.56 2272.9929 28.732 2272.99 28.732 14JB28-85 608.15 66217.58 4.493 6.8876902 1.95 7.0688792 3.6 0.3531205 3.03 1949.4819 51.01 2120.1346 32.07 2289.9765 33.52 2289.98 33.52 14JB28-199 484.04 128670.7 2.056 6.8123535 1.89 7.5685747 2.95 0.373947 2.26 2047.9458 39.69 2181.1458 26.43 2308.8725 32.411 2308.87 32.411 14JB28-252 1178.9 279418.8 4.884 6.7239562 2.09 8.7767006 3.17 0.428011 2.38 2296.7448 46.04 2315.0755 28.9 2331.2699 35.784 2331.27 35.784 14JB28-261 629.49 149542.9 1.009 6.6999967 2.9 8.8410234 4.06 0.4296115 2.84 2303.9658 55.06 2321.734 37.03 2337.3821 49.575 2337.38 49.575 14JB28-193 617.6 20476.01 5.282 6.6570351 1.01 7.1449688 2.81 0.3449689 2.63 1910.5294 43.42 2129.6648 25.06 2348.3818 17.224 2348.38 17.224 14JB28-320 227.94 17486.17 0.955 6.6381035 1.57 7.6866363 2.2 0.3700659 1.55 2029.7105 26.95 2195.0407 19.81 2353.2498 26.833 2353.25 26.833 14JB28-80 211.9 240574.3 52.55 6.5671649 1.4 8.7672293 2.31 0.4175793 1.83 2249.4809 34.79 2314.0913 21.03 2371.5927 23.896 2371.59 23.896 14JB28-165 845.93 76992.45 1.731 6.5251063 1.4 8.894176 2.77 0.4209127 2.4 2264.6215 45.78 2327.2034 25.33 2382.545 23.79 2382.54 23.79 14JB28-304 920.57 86588.72 2.173 6.4671805 1.7 7.4513761 3.2 0.3495024 2.72 1932.2221 45.35 2167.1618 28.7 2397.7199 28.928 2397.72 28.928 14JB28-297 1616 344225.3 11.85 6.4248397 1.48 10.02008 3 0.466909 2.62 2469.9915 53.69 2436.634 27.74 2408.8868 25.076 2408.89 25.076 14JB28-55 730.31 57142.23 1.119 6.4102352 1.61 9.5667712 2.58 0.4447727 2.02 2371.9708 40 2393.9831 23.72 2412.7527 27.345 2412.75 27.345

175 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 14JB28-298 368.35 95268.32 28.48 6.3210867 1.3 9.5073003 2.08 0.4358607 1.63 2332.0834 31.88 2388.2523 19.13 2436.5044 21.974 2436.5 21.974 14JB28-180 125.62 64938.5 0.823 6.3107249 1.66 10.649716 3.63 0.4874342 3.23 2559.5656 68.28 2493.0515 33.74 2439.2837 28.127 2439.28 28.127 14JB28-311 452.31 430787.3 2.239 6.232772 1.45 10.163524 6.16 0.4594352 5.98 2437.0638 121.5 2449.7656 56.99 2460.3145 24.561 2460.31 24.561 14JB28-38 249.01 193566.1 1.953 6.2315986 1.56 10.158637 2.94 0.4591279 2.49 2435.7061 50.51 2449.321 27.17 2460.6327 26.366 2460.63 26.366 14JB28-302 458.21 149939.8 1.717 6.2296559 1.62 9.9225631 4.17 0.4483185 3.84 2387.7726 76.61 2427.6089 38.46 2461.1597 27.416 2461.16 27.416 14JB28-76 292.38 166262.6 1.556 6.1958836 2.05 10.222136 3.06 0.4593499 2.27 2436.6869 45.97 2455.0827 28.28 2470.337 34.664 2470.34 34.664 14JB28-70 984.25 230817.1 2.055 6.1667583 1.47 9.9309514 3.69 0.4441672 3.38 2369.2689 67.04 2428.3884 34.04 2478.29 24.868 2478.29 24.868 14JB28-144 2436 54426.29 13.57 6.1149174 1.26 9.8155084 2.5 0.4353135 2.16 2329.6263 42.2 2417.6078 23.05 2492.5231 21.284 2492.52 21.284 14JB28-219 206.12 193123.3 4.334 6.1097057 1.55 10.491346 4.67 0.46489 4.41 2461.1131 90.17 2479.1534 43.34 2493.9596 26.143 2493.96 26.143 14JB28-152 923.08 79516.48 2.086 6.1039359 2.42 10.775605 3.55 0.4770351 2.59 2514.3387 54.03 2503.9651 32.99 2495.551 40.787 2495.55 40.787 14JB28-8 369.33 175133.9 2.197 6.1039238 1.74 10.293509 3.59 0.4556919 3.14 2420.508 63.32 2461.5202 33.21 2495.5544 29.261 2495.55 29.261 14JB28-49 444.64 160287.6 2.198 6.1031341 1.92 10.424626 3.39 0.4614367 2.79 2445.8985 56.81 2473.2408 31.42 2495.7723 32.416 2495.77 32.416 14JB28-1 1268.8 73282.61 1.002 6.0802453 1.17 10.677795 3.14 0.4708704 2.91 2487.3769 60.07 2495.4959 29.12 2502.0985 19.621 2502.1 19.621 14JB28-231 108.65 44159.3 1.494 6.0450762 1.54 11.236648 3.02 0.4926486 2.6 2582.125 55.35 2542.9612 28.18 2511.8519 25.841 2511.85 25.841 14JB28-122 795.04 158997.9 1.558 6.0228138 1.37 10.813914 3.88 0.4723687 3.63 2493.94 75.15 2507.2631 36.1 2518.0542 22.974 2518.05 22.974 14JB28-296 240.09 73599.79 0.869 5.9636938 1.49 10.703788 3.36 0.4629686 3.02 2452.6522 61.54 2497.7535 31.24 2534.6181 24.941 2534.62 24.941 14JB28-161 411.45 218066.4 2.418 5.8949785 1.2 11.068308 3.96 0.473219 3.77 2497.662 78.15 2528.8956 36.89 2554.0371 20.037 2554.04 20.037 14JB28-249 207.96 247362.2 2.424 5.8275568 2.23 11.476533 6.47 0.4850605 6.07 2549.2701 127.8 2562.674 60.47 2573.2818 37.299 2573.28 37.299 14JB28-306 212.87 103798 0.944 5.8128868 2.52 11.059801 3.57 0.4662705 2.53 2467.1851 51.9 2528.1796 33.28 2577.4938 42.108 2577.49 42.108 14JB28-321 598.66 213833.4 1.508 5.671306 2.14 10.390519 3.64 0.4273848 2.95 2293.9173 56.93 2470.2049 33.75 2618.6026 35.575 2618.6 35.575 14JB28-61 128.92 104804.8 2.846 5.5053572 1.41 12.165207 2.96 0.4857399 2.6 2552.2183 54.83 2617.2286 27.78 2667.9005 23.395 2667.9 23.395 14JB28-65 111.6 35577.1 1.173 5.4807275 1.69 12.9407 3.34 0.5143926 2.88 2675.355 63.11 2675.3441 31.5 2675.3244 27.961 2675.32 27.961 14JB28-225 1669.8 809442 2.064 5.1178525 1.71 14.503687 2.65 0.5383502 2.02 2776.5387 45.63 2783.244 25.19 2788.0927 28.062 2788.09 28.062 14JB28-194 266.15 150164.6 1.617 5.0054847 1.19 15.126709 3.88 0.5491479 3.69 2821.628 84.33 2823.2491 36.94 2824.397 19.381 2824.4 19.381 14JB28-181 283.76 174100.4 1.68 4.8555197 2.13 16.198072 3.62 0.570424 2.93 2909.5608 68.59 2888.5589 34.65 2873.9403 34.615 2873.94 34.615 14JB28-31 151.51 184440.1 0.93 4.6380558 1.3 16.70128 6.47 0.5618035 6.34 2874.0774 147.1 2917.8423 62.09 2948.1599 21.028 2948.16 21.028 14JB28-312 908.34 1164.058 1.269 4.4673187 7.27 15.716421 8.38 0.5092128 4.17 2653.2679 90.78 2859.7162 80.19 3008.5643 116.95 3008.56 116.95 14JB28-146 1628 155814.9 8.693 4.3729118 1.68 15.143605 4.98 0.4802847 4.69 2528.5055 98.06 2824.3123 47.47 3042.8204 26.921 3042.82 26.921 14JB28-12 209.75 226159.1 2.295 4.2429114 1 17.700584 2.44 0.5446911 2.23 2803.0554 50.76 2973.6049 23.5 3091.069 15.889 3091.07 15.889 14JB34 (n=95)(29.76062, 100.35361) - Redbed Sandstone interlayered in Conglomerate 14JB34-26 1494.3 5784.143 0.937 23.584053 6.63 0.0371073 6.75 0.0063471 1.24 40.786825 0.503 36.995866 2.451 -202.60387 166.4 40.7868 0.5028 14JB34-12 200.92 584.3167 3.194 11.4667 21.6 0.077255 22.4 0.0064249 5.95 41.284816 2.448 75.560849 16.31 1365.0989 420.79 41.2848 2.4478 14JB34-58 1087.5 625.4529 1.458 29.302194 18.7 0.0303726 18.8 0.0064548 1.72 41.476427 0.71 30.380765 5.626 -779.41296 532.31 41.4764 0.7096 14JB34-79 401.02 1069.352 0.999 16.259624 19.1 0.0551085 19.5 0.0064987 3.98 41.757878 1.655 54.468779 10.34 656.85309 412.98 41.7579 1.6547 14JB34-20 197.65 454.544 0.579 13.835546 26.8 0.0668201 27.6 0.0067051 6.53 43.079269 2.802 65.677352 17.56 993.74801 555.01 43.0793 2.8022 14JB34-85 296.51 6394.116 2.955 22.219831 5.72 0.2006864 5.97 0.0323413 1.69 205.18498 3.404 185.70683 10.12 -55.369766 139.5 205.185 3.404 14JB34-97 123.09 829.5699 2.239 30.359925 28.7 0.1528521 28.8 0.0336567 2.32 213.3935 4.863 144.42707 38.81 -880.67976 843.01 213.394 4.8625 14JB34-86 267.98 5544.214 2.207 20.012424 6.84 0.2330738 6.95 0.0338292 1.23 214.46959 2.599 212.73302 13.34 193.57199 159.15 214.47 2.5986 14JB34-67 423.11 10518.86 1.663 20.856398 4.91 0.2236728 4.98 0.0338338 0.84 214.4984 1.781 204.96203 9.242 96.665185 116.21 214.498 1.7808 14JB34-69 186.44 511.0232 1.569 29.127379 20.3 0.1603956 20.4 0.0338838 1.68 214.81013 3.557 151.04936 28.63 -762.54208 576.59 214.81 3.5566 14JB34-4 323.84 4834.477 1.545 21.284972 5.49 0.2198789 5.62 0.0339434 1.23 215.18155 2.593 201.809 10.29 48.297181 131.13 215.182 2.5933 14JB34-98 238.55 7417.588 1.957 20.693245 6.41 0.2263391 6.56 0.0339693 1.38 215.34313 2.915 207.17201 12.29 115.23063 151.38 215.343 2.9148 14JB34-55 282.53 6377.902 1.385 20.101972 5.51 0.2343701 5.63 0.0341696 1.16 216.59158 2.466 213.7999 10.86 183.13694 128.47 216.592 2.4663 14JB34-95 595.35 722.6672 2.349 21.390015 11.6 0.2203314 11.7 0.0341811 1.37 216.66349 2.924 202.1856 21.48 36.491521 279.31 216.663 2.9239 14JB34-21 231.04 4342.899 1.556 20.621209 7.02 0.2285557 7.21 0.0341826 1.63 216.67267 3.483 209.00572 13.61 123.40412 165.46 216.673 3.4828 14JB34-60 263.63 7299.99 1.652 21.896243 6.48 0.2154397 6.65 0.0342132 1.46 216.86366 3.122 198.10724 11.96 -19.753428 156.98 216.864 3.1223 14JB34-41 201.03 5818.315 1.185 21.694316 7.43 0.2179491 7.62 0.0342925 1.67 217.35799 3.56 200.20139 13.84 2.6049305 179.25 217.358 3.5597 14JB34-36 292.95 6980.994 1.72 20.537705 5.81 0.2303772 5.93 0.0343155 1.17 217.50098 2.512 210.51001 11.27 132.99814 136.7 217.501 2.5124 14JB34-83 378.07 8008.614 2.503 21.782409 4.85 0.21733 4.96 0.034334 1.06 217.61638 2.272 199.6852 8.993 -7.1573763 117.02 217.616 2.2717 14JB34-63 255.48 2744.091 2.918 20.825349 7.75 0.227707 7.96 0.0343928 1.83 217.98274 3.926 208.30398 15 100.17368 183.53 217.983 3.9257 14JB34-24 180.09 1583.583 1.195 22.719612 13.9 0.2091129 14 0.0344572 1.49 218.3844 3.2 192.80798 24.5 -109.84082 342.84 218.384 3.2001 14JB34-31 350.96 6821.371 3.096 22.494323 5.62 0.2115579 5.69 0.0345145 0.87 218.74094 1.865 194.8592 10.08 -85.364782 137.75 218.741 1.8648 14JB34-75 315.88 4469.774 1.929 22.191885 6.1 0.2145339 6.23 0.0345294 1.29 218.83402 2.765 197.35026 11.18 -52.303736 148.57 218.834 2.7651 14JB34-52 410.56 10178.19 1.954 20.62358 4.55 0.2318133 4.63 0.0346738 0.86 219.73367 1.864 211.69449 8.849 123.13288 107.21 219.734 1.8644 14JB34-88 349.19 8079.738 1.342 21.31323 5.45 0.2254579 5.52 0.0348508 0.89 220.83681 1.94 206.44213 10.31 45.093527 130.27 220.837 1.9403 14JB34-99 215.55 4188.255 1.132 21.595124 7.46 0.222705 7.62 0.0348806 1.54 221.02232 3.346 204.1586 14.09 13.625669 179.63 221.022 3.3458 14JB34-72 324.85 9073.069 2.358 19.36229 5.36 0.2488507 5.46 0.0349458 1.04 221.42796 2.253 225.6422 11.05 269.78127 123.06 221.428 2.2532 14JB34-28 143.02 3070.663 1.659 20.423925 9.59 0.2361667 9.81 0.034983 2.06 221.65977 4.493 215.2767 19.03 146.04378 225.4 221.66 4.4932 14JB34-94 542.05 5910.9 1.452 17.993985 5.9 0.2690048 6.01 0.0351064 1.09 222.42838 2.394 241.89769 12.93 435.37316 131.6 222.428 2.3939 14JB34-8 89.34 2894.024 1.516 17.734288 13.5 0.2748507 14 0.0353516 3.73 223.95554 8.215 246.56455 30.6 467.67107 299.42 223.956 8.2152 14JB34-82 306.31 743.9842 2.064 24.540138 8.16 0.1995701 8.25 0.0355199 1.22 225.00288 2.7 184.76237 13.93 -303.22176 208.85 225.003 2.6999 14JB34-37 238.3 3287.258 1.443 20.783162 6.98 0.2380535 7.12 0.0358827 1.39 227.2612 3.114 216.82527 13.89 104.94683 165.06 227.261 3.1136 14JB34-3 87.486 2300.167 0.655 20.526009 14.2 0.2636721 14.6 0.0392525 3.29 248.19798 8.015 237.62181 30.94 134.31833 335.79 248.198 8.0148 14JB34-40 215.06 2522.565 1.565 23.304669 7.4 0.2359437 7.55 0.0398795 1.5 252.08614 3.718 215.09343 14.63 -172.81641 184.53 252.086 3.7176 14JB34-9 123.9 3486.642 0.673 18.621712 10.5 0.3030418 10.7 0.040928 1.98 258.58279 5.007 268.77331 25.29 358.49974 238.1 258.583 5.0066 14JB34-100 306.12 4355.838 1.233 20.27364 6.24 0.287195 6.29 0.0422287 0.82 266.63245 2.129 256.34909 14.26 163.29302 146.03 266.632 2.1289 14JB34-61 115.51 1888.157 1.898 20.151533 11.4 0.2939603 11.7 0.0429631 2.86 271.17348 7.594 261.67184 27.04 177.39833 265.75 271.173 7.5936 14JB34-19 116.16 7900.136 0.921 17.588327 10.7 0.340538 10.9 0.0434399 2.21 274.11995 5.932 297.57939 28.23 485.96103 237.21 274.12 5.9324 14JB34-39 76.429 8622.023 1.003 17.276475 10.6 0.3546721 11 0.0444407 2.97 280.29996 8.16 308.22914 29.22 525.28328 232.53 280.3 8.1602 14JB34-35 74.039 1917.109 0.528 15.2653 14.9 0.4048365 15.2 0.0448212 3.18 282.64815 8.787 345.14994 44.61 790.67596 314.28 282.648 8.7867 14JB34-70 1103.3 3140.942 2.059 19.616909 1.76 0.3280141 1.85 0.0466683 0.57 294.0342 1.628 288.04861 4.64 239.7538 40.633 294.034 1.6275 14JB34-73 244.31 5833.667 1.364 19.591422 5.16 0.3473286 5.56 0.0493521 2.06 310.54236 6.234 302.70988 14.55 242.73858 119.04 310.542 6.2341 14JB34-80 390.34 11565.07 1.045 18.764949 2.88 0.387996 3.02 0.0528048 0.91 331.71856 2.935 332.90452 8.569 341.18457 65.174 331.719 2.9353 14JB34-81 234.48 3897.83 0.953 19.274558 5.35 0.3872321 5.57 0.0541321 1.54 339.84035 5.086 332.34552 15.79 280.2281 122.6 339.84 5.0861 14JB34-33 151.85 7003.415 0.881 21.000334 6.45 0.3590066 6.56 0.0546799 1.21 343.18944 4.029 311.47277 17.59 80.323725 153.18 343.189 4.0292 14JB34-18 237.11 1624.3 4.384 12.07061 16.2 0.6498885 21.5 0.056894 14.2 356.70883 49.25 508.41012 86.22 1265.5692 317.61 356.709 49.246 14JB34-92 298.26 4503.546 2.513 17.233555 4.65 0.465669 4.95 0.0582037 1.71 364.69229 6.064 388.19292 15.98 530.77689 101.93 364.692 6.0643

176 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 14JB34-34 120.85 4196.244 1.019 19.358379 7.34 0.4248484 7.53 0.0596488 1.66 373.48928 6.036 359.512 22.79 270.244 168.48 373.489 6.036 14JB34-23 344.72 1361.708 1.544 18.492504 4.37 0.4768985 7.13 0.0639618 5.64 399.67415 21.85 395.94284 23.39 374.19323 98.435 399.674 21.845 14JB34-38 271.65 10057.44 1.119 18.923944 4.02 0.5032454 4.08 0.0690701 0.69 430.55102 2.872 413.89694 13.86 322.08819 91.314 430.551 2.8717 14JB34-42 336.83 8200.11 0.8 17.757198 2.84 0.5427064 2.9 0.0698937 0.62 435.5153 2.617 440.20743 10.37 464.81471 62.863 435.515 2.617 14JB34-22 436.73 11017.9 1.433 18.261674 2.29 0.5364857 2.35 0.0710555 0.5 442.51137 2.141 436.10479 8.315 402.39451 51.329 442.511 2.1406 14JB34-32 203.29 9788.947 0.959 18.346746 3.63 0.5541339 3.77 0.0737348 1 458.6175 4.424 447.70109 13.64 391.97675 81.525 458.617 4.424 14JB34-62 155.65 6408.505 1.549 17.824203 5.73 0.5880433 5.85 0.0760183 1.15 472.31241 5.231 469.61731 21.99 456.47843 127.31 472.312 5.2313 14JB34-7 50.226 4355.653 1.424 18.453758 10.2 0.5947979 10.4 0.0796073 2.24 493.77839 10.63 473.92699 39.55 378.91256 229.82 493.778 10.626 14JB34-11 93.308 2448.648 1.334 20.866609 7.74 0.5270593 7.85 0.0797646 1.3 494.71739 6.173 429.85618 27.53 95.470564 183.58 494.717 6.1729 14JB34-56 175.09 6049.81 1.454 17.815838 4.66 0.617763 4.76 0.0798228 0.95 495.06489 4.509 488.44428 18.45 457.52927 103.47 495.065 4.5088 14JB34-30 1265.9 22701.31 4.327 16.656144 0.6 0.7126694 0.97 0.0860917 0.76 532.3814 3.896 546.33012 4.094 604.92022 12.925 532.381 3.8961 14JB34-47 465.03 14626.2 1.787 16.670945 1.34 0.7921969 1.44 0.0957838 0.53 589.65291 2.983 592.4173 6.464 602.99884 28.985 589.653 2.9833 14JB34-5 31.686 2422.826 2.245 16.823365 13.7 0.8573703 14 0.1046116 2.88 641.37836 17.57 628.68627 65.74 583.27024 298.9 641.378 17.57 14JB34-93 307.77 24075.8 1.954 15.838567 1.41 0.9952894 1.52 0.114331 0.56 697.85155 3.732 701.41555 7.708 712.82969 30.033 697.852 3.732 14JB34-68 221.57 13204.31 0.868 15.197905 1.86 1.1580437 1.95 0.1276461 0.58 774.42272 4.215 781.0348 10.6 799.9534 38.934 774.423 4.2154 14JB34-25 117.34 8821.415 0.685 15.24982 3.28 1.1619574 3.36 0.1285149 0.71 779.38799 5.215 782.87455 18.33 792.80446 68.892 779.388 5.2151 14JB34-74 223.26 1579.14 1.881 15.248146 3.59 1.1947283 3.94 0.132125 1.62 799.97666 12.16 798.15024 21.79 793.03471 75.444 799.977 12.163 14JB34-16 201.29 18470.62 1.17 15.078273 1.73 1.2202928 1.97 0.1334487 0.94 807.50966 7.102 809.90919 10.97 816.53105 36.114 807.51 7.1017 14JB34-71 203.23 8105.256 0.753 14.575651 2.36 1.2719718 2.6 0.1344634 1.08 813.27819 8.222 833.27215 14.77 886.9438 48.877 813.278 8.2216 14JB34-51 99.076 2344.186 1.211 14.407203 6.08 1.3704013 6.25 0.1431945 1.43 862.701 11.56 876.33577 36.7 910.92232 125.35 862.701 11.557 14JB34-29 156.13 19958.91 0.834 13.920494 1.71 1.6298327 1.83 0.1645494 0.66 982.00977 5.992 981.79442 11.54 981.33094 34.843 981.331 34.843 14JB34-96 184.95 7917.022 1.17 13.89584 1.87 1.5271373 2 0.1539082 0.69 922.83369 5.951 941.34861 12.24 984.90211 38.092 984.902 38.092 14JB34-91 225.34 5629.929 4.565 13.692613 1.53 1.6814819 2.11 0.1669849 1.46 995.47745 13.47 1001.543 13.46 1014.8245 30.978 1014.82 30.978 14JB34-77 398.32 8083.738 3.447 13.638648 1.09 1.6882377 1.48 0.1669951 1.01 995.53348 9.289 1004.0979 9.447 1022.8197 21.991 1022.82 21.991 14JB34-48 192.39 1540.298 1.626 13.076875 4.47 1.6895136 4.58 0.1602376 1.01 958.09701 9.034 1004.5797 29.25 1107.4164 89.397 1107.42 89.397 14JB34-15 279.67 26837.8 1.513 11.305045 0.56 2.9323766 0.75 0.2404312 0.5 1388.9382 6.251 1390.3071 5.701 1392.3905 10.795 1392.39 10.795 14JB34-1 407.82 11217.94 2.606 10.143333 3.65 1.1359969 4.27 0.0835712 2.22 517.40363 11.03 770.60817 23.07 1597.5484 68.152 1597.55 68.152 14JB34-78 144.16 26499.83 1.394 9.8364452 0.96 4.1599594 1.12 0.2967741 0.58 1675.2923 8.519 1666.1712 9.159 1654.6814 17.755 1654.68 17.755 14JB34-44 115.07 14731.85 1.732 8.9715394 0.96 5.0407317 1.13 0.327989 0.59 1828.627 9.472 1826.1919 9.557 1823.3989 17.384 1823.4 17.384 14JB34-57 221.26 30728.57 5.145 8.8023451 0.45 4.609165 0.94 0.294252 0.83 1662.7423 12.1 1750.9284 7.85 1857.8653 8.1589 1857.87 8.1589 14JB34-54 26.138 4651.551 1.035 8.792726 4.61 5.5340487 4.83 0.352911 1.43 1948.4841 24.11 1905.9012 41.55 1859.8406 83.316 1859.84 83.316 14JB34-17 94.567 18559.81 2.003 8.7275641 0.76 5.3652763 0.98 0.3396127 0.62 1884.8059 10.07 1879.3295 8.376 1873.2658 13.716 1873.27 13.716 14JB34-27 125.95 15887.58 2.344 8.7175214 0.77 5.3789953 0.92 0.3400893 0.51 1887.0989 8.266 1881.5156 7.917 1875.3419 13.96 1875.34 13.96 14JB34-49 264.85 12804.16 0.911 8.6926329 0.36 5.37787 0.71 0.3390474 0.61 1882.085 10 1881.3364 6.106 1880.495 6.572 1880.49 6.572 14JB34-43 252.07 29579.16 3.45 8.6518866 0.4 5.2809108 0.55 0.331374 0.39 1845.0376 6.2 1865.7816 4.721 1888.9564 7.1186 1888.96 7.1186 14JB34-2 120.49 20486.84 1.581 8.6423876 0.72 5.3696434 0.89 0.3365719 0.52 1870.1568 8.438 1880.0259 7.591 1890.9296 12.928 1890.93 12.928 14JB34-13 322.75 41946.52 5.677 8.6073636 0.35 5.4202297 0.72 0.3383659 0.63 1878.8034 10.21 1888.058 6.137 1898.2341 6.232 1898.23 6.232 14JB34-10 264.49 35362.22 3.972 8.5603989 0.42 5.6394625 1.17 0.3501309 1.09 1935.2235 18.2 1922.1516 10.06 1908.0657 7.5092 1908.07 7.5092 14JB34-46 131.11 27202.41 1.926 8.4859238 0.69 5.6981058 0.89 0.350694 0.56 1937.9117 9.3 1931.0806 7.67 1923.7434 12.414 1923.74 12.414 14JB34-66 100.47 14901.39 1.172 7.368656 0.48 7.5452158 0.82 0.4032354 0.66 2183.92 12.22 2178.3739 7.312 2173.1404 8.3583 2173.14 8.3583 14JB34-42 471.88 45828.1 2.41 7.1858292 0.28 7.104496 1.32 0.3702618 1.29 2030.6321 22.52 2124.6068 11.78 2216.8022 4.9258 2216.8 4.9258 14JB34-87 33.587 6379.258 0.954 6.1373831 1.55 10.114938 1.75 0.4502411 0.83 2396.3246 16.57 2445.3368 16.21 2486.3429 26.065 2486.34 26.065 14JB34-14 230.13 57402.12 1.826 5.9592289 0.21 11.188996 0.46 0.4835929 0.41 2542.8962 8.66 2538.9994 4.318 2535.8746 3.5504 2535.87 3.5504 14JB34-59 207.73 26350.96 1.02 5.9004314 0.26 11.343996 0.47 0.4854545 0.39 2550.9802 8.245 2551.83 4.406 2552.4947 4.4204 2552.49 4.4204 14JB34-50 138.79 22877.12 1.006 5.8371065 0.35 9.9039642 0.65 0.4192812 0.55 2257.2155 10.39 2425.8785 5.98 2570.5447 5.8635 2570.54 5.8635 14JB34-6 121.08 18841.29 1.822 5.7920327 0.57 10.681729 0.94 0.4487157 0.75 2389.5405 15.07 2495.838 8.76 2583.4967 9.4481 2583.5 9.4481 14JB34-68 123.62 24322.51 1.834 5.083761 0.32 13.842919 0.89 0.510401 0.83 2658.3412 18.1 2739.019 8.439 2799.0349 5.2719 2799.03 5.2719 14JB34-64 78.133 17254.11 116.2 3.8704845 0.32 19.562219 1.37 0.5491388 1.34 2821.5903 30.53 3069.9653 13.27 3236.7567 5.0506 3236.76 5.0506 13JB014 (n=87)(29.77022, 100.39193) - Redbed Sandstone interlayered in Conglomerate 13JB013B-39 295.4 21996.79 1.495 18.835558 3.49 0.2640578 4.07 0.0360725 2.08 228.44236 4.671 237.93169 8.628 332.7121 79.251 228.442 4.6706 13JB013B-41 323.01 110979.8 1.418 19.673651 1.52 0.2555561 2.67 0.0364645 2.2 230.88079 4.981 231.07947 5.521 233.12284 35.102 230.881 4.9809 13JB013B-28 205.3 36899.38 0.983 19.093548 3.04 0.2661048 3.73 0.0368501 2.15 233.27845 4.924 239.57466 7.953 301.76284 69.42 233.278 4.9244 13JB013B-18 131.16 3417.019 1.074 20.022207 8.49 0.2752622 9.13 0.0399721 3.35 252.66022 8.293 246.89225 20.01 192.43608 197.75 252.66 8.2934 13JB013B-57 199.01 59705.38 3.929 18.924828 1.9 0.3726795 2.97 0.0511524 2.28 321.5929 7.157 321.63744 8.179 321.98222 43.06 321.593 7.1572 13JB013B-37 230.3 25649.09 4.264 18.877739 2.27 0.3817348 4.04 0.0522649 3.34 328.41211 10.69 328.31378 11.32 327.601 51.51 328.412 10.685 13JB013B-47 240.08 43857.44 4.127 15.306696 3.5 0.5933003 8.58 0.065865 7.83 411.1954 31.2 472.97308 32.45 784.991 73.559 411.195 31.196 13JB013B-78 130.39 13065.73 8.381 18.385642 4.52 0.5175732 4.87 0.0690159 1.8 430.22416 7.504 423.52892 16.86 387.22216 101.63 430.224 7.5038 13JB013B-88 459.47 3639.589 4.202 17.797208 1.99 0.5413163 2.3 0.0698718 1.16 435.38308 4.891 439.2921 8.204 459.81528 44.035 435.383 4.8912 13JB013B-48 128.59 11637.83 1.596 17.965714 4.33 0.540388 4.7 0.0704124 1.84 438.63953 7.816 438.68033 16.75 438.87283 96.319 438.64 7.8159 13JB013B-68 327.91 16251.87 1.166 18.048425 1.75 0.5379372 3.26 0.0704157 2.75 438.65977 11.65 437.06356 11.57 428.64161 39.038 438.66 11.654 13JB013B-34 321.24 38000.12 1.221 17.966636 1.48 0.541872 2.4 0.0706093 1.89 439.82576 8.031 439.65809 8.554 438.7587 32.845 439.826 8.0308 13JB013B-52 157.22 35024.83 2.153 18.416131 1.17 0.5303025 4.01 0.0708306 3.84 441.15772 16.36 432.01039 14.11 383.50076 26.244 441.158 16.36 13JB013B-21 94.837 10430.14 1.025 18.219555 3.41 0.5408583 3.72 0.0714694 1.5 445.00217 6.455 438.99033 13.27 407.56367 76.286 445.002 6.4548 13JB013B-58 103.56 7375.884 1.425 18.141212 6.98 0.5458462 7.43 0.0718183 2.54 447.10123 10.99 442.27186 26.63 417.19884 155.97 447.101 10.989 13JB013B-100 142.2 14652.99 0.985 18.415203 3.31 0.546035 3.82 0.0729282 1.9 453.77332 8.325 442.3959 13.68 383.61388 74.358 453.773 8.3249 13JB013B-70 320.29 85749.26 1.776 17.70209 1.56 0.5698584 3.43 0.0731628 3.05 455.18233 13.42 457.92294 12.64 471.70708 34.526 455.182 13.421 13JB013B-94 73.154 7237.879 1.267 18.748366 6.33 0.5385777 6.59 0.0732336 1.82 455.60787 8.007 437.48636 23.43 343.17928 143.5 455.608 8.0074 13JB013B-84 290.49 29819.64 1.812 18.310512 1.84 0.5574902 2.74 0.0740349 2.04 460.4189 9.048 449.89153 9.964 396.41042 41.146 460.419 9.0484 13JB013B-91 74.855 13493.89 1.071 17.502553 4.71 0.594511 5.31 0.0754675 2.46 469.01187 11.13 473.74436 20.11 496.7292 103.79 469.012 11.128 13JB013B-87 105.23 26262.56 1.683 17.220947 3.91 0.7772256 4.4 0.097074 2.02 597.23845 11.5 583.89956 19.54 532.37977 85.663 597.238 11.505 13JB013B-33 161.61 50916.53 2.878 16.688272 2.3 0.8163289 3.26 0.0988042 2.31 607.39703 13.4 605.99823 14.89 600.75084 49.826 607.397 13.4 13JB013B-79 629.36 196192.1 2.566 16.593934 0.79 0.8629954 1.86 0.103862 1.68 637.00188 10.21 631.75674 8.755 613.00959 17.178 637.002 10.211 13JB013B-66 239.57 18146.04 1.963 15.565141 1.71 0.9488815 2.09 0.1071183 1.2 655.9905 7.514 677.52002 10.34 749.72397 36.095 655.991 7.5138 13JB013B-42 48.222 5421.647 1.298 15.901877 8.21 1.027141 8.44 0.1184615 1.99 721.70225 13.58 717.49648 43.46 704.37559 174.88 721.702 13.581 13JB013B-53 67.324 11561.39 0.789 15.581031 4.87 1.069838 5.56 0.1208963 2.69 735.72029 18.72 738.66105 29.21 747.56863 102.94 735.72 18.722 13JB013B-43 45.834 10839.77 0.91 15.287561 6.88 1.1191235 7.64 0.1240838 3.33 754.02587 23.66 762.55525 41 787.61757 144.61 754.026 23.663 13JB013B-11 238.26 46316.37 1.156 15.394751 1.01 1.1158165 4.28 0.1245846 4.16 756.8972 29.71 760.96949 22.93 772.9302 21.211 756.897 29.712

177 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13JB013B-06 42.149 32264.86 1.047 14.985914 6.03 1.1486953 6.3 0.1248495 1.81 758.41578 12.98 776.62673 34.22 829.35751 125.96 758.416 12.982 13JB013B-07 43.989 6380.793 0.716 14.556723 5.38 1.2001783 5.62 0.1267092 1.64 769.06476 11.9 800.66855 31.15 889.64575 111.17 769.065 11.903 13JB013B-62 105.95 45870.93 1.059 15.372624 2.01 1.1446445 2.86 0.1276196 2.03 774.27143 14.83 774.71067 15.5 775.95606 42.299 774.271 14.829 13JB013B-67 59.847 23674.24 0.912 15.394148 2.61 1.1458145 3.4 0.1279289 2.18 776.03947 15.93 775.26445 18.45 773.01271 55.037 776.039 15.931 13JB013B-82 88.357 22262.47 0.836 15.35728 2.62 1.1642729 3.85 0.1296784 2.83 786.03083 20.96 783.96147 21.06 778.05611 55.024 786.031 20.955 13JB013B-26 114.94 26090.22 1.262 14.89404 1.24 1.2084251 1.59 0.1305362 1 790.92365 7.414 804.46731 8.855 842.16772 25.887 790.924 7.4139 13JB013B-63 51.863 30285.37 1.108 15.030273 4.97 1.2031968 5.34 0.1311603 1.95 794.48113 14.58 802.06063 29.59 823.19065 103.73 794.481 14.579 13JB013B-86 50.272 6816.693 1.545 15.344856 4.8 1.199665 5.57 0.1335124 2.84 807.87181 21.53 800.43162 30.87 779.75947 100.94 807.872 21.529 13JB013B-95 110.89 38826.84 0.592 15.12282 3.27 1.2256232 4.89 0.1344276 3.64 813.07477 27.81 812.34399 27.35 810.3218 68.358 813.075 27.806 13JB013B-10 98.068 22416.85 1.02 15.229397 1.82 1.217148 4.61 0.1344389 4.24 813.13865 32.37 808.47001 25.7 795.61489 38.082 813.139 32.37 13JB013B-56 236.2 78225.17 2.078 15.079233 0.89 1.2350448 2.7 0.1350706 2.55 816.72723 19.53 816.63326 15.13 816.39622 18.582 816.727 19.529 13JB013B-92 107.23 45053.01 0.915 15.06252 1.23 1.2465038 2.79 0.1361727 2.51 822.9835 19.36 821.82581 15.74 818.71475 25.789 822.984 19.362 13JB013B-97 327.68 85900.32 1.299 14.98182 0.94 1.2685371 2.2 0.1378372 1.99 832.42082 15.55 831.73598 12.51 829.88629 19.677 832.421 15.548 13JB013B-77 25.435 5688.125 1.563 14.830264 6.32 1.318847 7.35 0.1418541 3.76 855.13866 30.11 854.0083 42.5 851.06876 131.52 855.139 30.106 13JB013B-30 39.72 8117.473 0.903 14.339115 4.29 1.4278702 4.88 0.1484943 2.31 892.51751 19.25 900.65938 29.12 920.70612 88.317 920.706 88.317 13JB013B-59 111.98 22762.05 2.114 14.324965 1.17 1.4193674 4.96 0.1474644 4.82 886.73404 39.95 897.09712 29.57 922.73649 24.032 922.736 24.032 13JB013B-54 73.268 27545.86 1.6 14.222877 3.21 1.4829369 3.87 0.1529709 2.17 917.59557 18.52 923.43209 23.46 937.41825 65.722 937.418 65.722 13JB013B-16 101.71 52982.93 0.913 12.771701 0.9 2.1810405 2.65 0.2020278 2.49 1186.2046 27.02 1175.0098 18.45 1154.4277 17.805 1154.43 17.805 13JB013B-90 75.092 8131.377 0.775 12.340276 1.17 2.1582599 3.22 0.1931645 3 1138.495 31.27 1167.7121 22.33 1222.2862 23.045 1222.29 23.045 13JB013B-15 120.29 106705.8 0.544 11.587719 0.93 2.856658 4.06 0.2400794 3.95 1387.1099 49.26 1370.5651 30.52 1344.8552 18.047 1344.86 18.047 13JB013B-20 182.23 107272.5 1.879 11.246616 1.86 2.59724 2.56 0.2118521 1.76 1238.6773 19.82 1299.8598 18.75 1402.3247 35.582 1402.32 35.582 13JB013B-31 190.12 87752.94 2.077 10.307681 1.72 3.0027024 3.2 0.2244771 2.7 1305.4883 31.88 1408.3056 24.39 1567.4908 32.301 1567.49 32.301 13JB013B-32 167.46 139457.8 1.353 9.5136535 0.35 4.6111373 2.65 0.3181662 2.63 1780.7675 40.93 1751.2854 22.15 1716.2592 6.3971 1716.26 6.3971 13JB013B-40 41.836 29032.48 1.272 9.1638372 5.69 4.4618876 8.44 0.2965478 6.23 1674.1673 91.89 1723.9117 70.13 1784.8345 103.87 1784.83 103.87 13JB013B-38 167.17 34351.73 1.685 9.1063523 0.47 4.8276103 2.3 0.3188419 2.25 1784.0709 35.05 1789.7213 19.33 1796.2975 8.5658 1796.3 8.5658 13JB013B-24 17.433 11723.59 0.689 8.992756 2.23 4.9670071 5.17 0.3239562 4.67 1809.021 73.62 1813.7234 43.73 1819.1122 40.401 1819.11 40.401 13JB013B-75 219.97 95634.33 4.303 8.9377049 0.58 4.654328 3.27 0.3017045 3.22 1699.7552 48.15 1759.0712 27.38 1830.2512 10.514 1830.25 10.514 13JB013B-83 301.84 56566.46 13.85 8.8403017 0.4 4.697694 4.87 0.3011969 4.85 1697.2413 72.42 1766.829 40.79 1850.0915 7.2887 1850.09 7.2887 13JB013B-03 43.687 21403.57 0.711 8.8262172 0.5 5.1504773 1.53 0.3297014 1.45 1836.9342 23.11 1844.4735 13.02 1852.9744 9.0927 1852.97 9.0927 13JB013B-44 348.59 100880 1.252 8.7767967 0.21 4.7806295 1.84 0.3043125 1.83 1712.6583 27.53 1781.5023 15.47 1863.1153 3.7187 1863.12 3.7187 13JB013B-51 49.428 54452.62 0.758 8.7686213 0.95 5.0352487 2.9 0.3202219 2.75 1790.8125 42.92 1825.2699 24.6 1864.7978 17.08 1864.8 17.08 13JB013B-45 236.94 116422.2 1.315 8.7557158 0.42 4.7631814 1.49 0.3024736 1.42 1703.5632 21.32 1778.4329 12.47 1867.4562 7.6383 1867.46 7.6383 13JB013B-81 145.39 40352.17 1.217 8.750681 0.34 5.2513908 2.28 0.3332843 2.25 1854.2809 36.28 1860.9981 19.42 1868.4941 6.116 1868.49 6.116 13JB013B-65 165.13 75543.73 2.371 8.741537 0.4 5.0127933 1.98 0.3178091 1.94 1779.0207 30.1 1821.4849 16.74 1870.3804 7.244 1870.38 7.244 13JB013B-55 107.13 47242.48 1.189 8.7412332 0.64 5.0698456 1.37 0.321415 1.21 1796.6359 18.9 1831.0739 11.59 1870.4431 11.622 1870.44 11.622 13JB013B-29 62.921 12068.51 0.794 8.7309232 3.06 4.8422927 3.94 0.3066267 2.49 1724.0855 37.6 1792.2763 33.21 1872.5719 55.247 1872.57 55.247 13JB013B-96 334.59 136055.9 2.785 8.7153499 0.2 5.3351796 2.23 0.337235 2.22 1873.3539 36.13 1874.5171 19.08 1875.791 3.5612 1875.79 3.5612 13JB013B-74 193.81 62413.25 3.497 8.7128808 0.39 5.1440994 1.11 0.3250647 1.04 1814.4162 16.43 1843.42 9.437 1876.3018 7.0362 1876.3 7.0362 13JB013B-12 312.92 86373.83 4.246 8.712638 0.24 5.1933491 1.99 0.3281678 1.98 1829.4947 31.5 1851.5266 16.96 1876.3521 4.2557 1876.35 4.2557 13JB013B-69 202.31 84334.28 1.049 8.7115334 0.36 5.2582371 3.28 0.3322259 3.26 1849.1614 52.33 1862.1095 27.95 1876.5806 6.5684 1876.58 6.5684 13JB013B-60 445.9 108624.5 3.106 8.7110265 0.21 5.318686 1.58 0.3360256 1.56 1867.5214 25.31 1871.8701 13.47 1876.6855 3.8555 1876.69 3.8555 13JB013B-19 228 46979.75 1.503 8.6950878 0.16 5.1631377 2.78 0.3256015 2.78 1817.0271 44 1846.5614 23.68 1879.9862 2.8455 1879.99 2.8455 13JB013B-61 236.84 134756.1 3.812 8.6936509 0.29 5.0294758 1.21 0.31712 1.18 1775.649 18.24 1824.2982 10.25 1880.284 5.2061 1880.28 5.2061 13JB013B-99 160.06 133950.8 2.004 8.6877237 0.27 5.4302748 0.9 0.3421579 0.85 1897.0422 14.05 1889.6454 7.677 1881.5128 4.7971 1881.51 4.7971 13JB013B-27 213.16 230154.1 2.048 8.6867237 0.48 5.582133 3.01 0.3516859 2.97 1942.6437 49.8 1913.3461 25.91 1881.7202 8.7138 1881.72 8.7138 13JB013B-93 137.19 65880.87 2.008 8.6760846 0.3 5.5279814 1.84 0.3478477 1.82 1924.3126 30.21 1904.9579 15.82 1883.9277 5.3444 1883.93 5.3444 13JB013B-08 107.21 64513.37 2.366 8.6731012 0.38 5.5061665 2.38 0.3463558 2.35 1917.1735 39.03 1901.559 20.49 1884.5471 6.9007 1884.55 6.9007 13JB013B-73 131.51 66971.98 2.263 8.6513732 0.74 5.5579235 1.76 0.3487356 1.59 1928.5582 26.53 1909.6045 15.12 1889.0632 13.4 1889.06 13.4 13JB013B-46 439.99 368119 22.01 8.6258112 0.15 5.0669948 2.22 0.3169926 2.21 1775.0254 34.32 1830.5969 18.8 1894.3838 2.6097 1894.38 2.6097 13JB013B-04 341.88 67245.62 81.21 8.3993096 2.4 5.4839153 3.23 0.3340666 2.16 1858.062 34.91 1898.0805 27.77 1942.1097 42.99 1942.11 42.99 13JB013B-49 96.455 112270.8 0.995 8.3753785 0.71 5.7415962 2.05 0.3487673 1.92 1928.7097 32.01 1937.6522 17.7 1947.2116 12.628 1947.21 12.628 13JB013B-71 376.03 165048.8 1.21 7.9448498 0.27 6.5127738 2.87 0.3752757 2.86 2054.1769 50.26 2047.6263 25.27 2041.0187 4.798 2041.02 4.798 13JB013B-05 96.408 143481.7 1.829 7.5170608 0.37 7.2380244 1.27 0.3946089 1.22 2144.1675 22.23 2141.1997 11.37 2138.3393 6.5418 2138.34 6.5418 13JB013B-98 443.91 23149.41 3.58 7.3144197 0.36 6.2937172 2.17 0.3338765 2.14 1857.1433 34.6 2017.5797 19.06 2186.0017 6.2818 2186 6.2818 13JB013B-85 118.3 30077.1 1.879 7.032868 2.14 8.4539153 4.36 0.4312103 3.79 2311.1711 73.71 2280.9859 39.59 2254.0291 36.987 2254.03 36.987 13JB013B-02 274.21 243610.8 1.983 6.2122085 0.21 10.025199 1.97 0.4516872 1.95 2402.749 39.21 2437.1056 18.16 2465.8985 3.6219 2465.9 3.6219 13JB013B-01 115.37 149811.7 0.581 6.1527441 0.35 10.253686 1.94 0.4575595 1.9 2428.7734 38.54 2457.9334 17.92 2482.1279 5.9563 2482.13 5.9563 13JB013B-50 56.488 61083.55 1.503 6.115403 0.54 9.9995616 9.4 0.4435114 9.39 2366.3407 185.9 2434.7418 86.99 2492.3894 9.1099 2492.39 9.1099 13JB013B-09 754.71 913147 13.54 5.9628351 0.98 10.889592 2.8 0.4709373 2.62 2487.6703 54.14 2513.7466 26.04 2534.8596 16.399 2534.86 16.399 13JB028 (n=188)(29.82423, 100.34638) - Redbed Sandstone 13JB028-187 4985.9 148316.1 2.129 20.772611 2.3 0.0413661 4.01 0.0062321 3.29 40.050059 1.313 41.15697 1.618 106.14796 54.376 40.0501 1.3125 13JB028-144 1509.9 27668.54 2.004 19.888747 3.71 0.0441732 5.9 0.0063718 4.59 40.945178 1.874 43.890267 2.535 207.94048 86.036 40.9452 1.874 13JB028-328 1775.3 76290.74 2.428 21.409632 3 0.0444781 3.73 0.0069064 2.21 44.368759 0.977 44.186798 1.611 34.325994 71.887 44.3688 0.9769 13JB028-281 2082.9 26970.01 2.012 14.449356 1.77 0.298209 2.6 0.0312513 1.91 198.3749 3.732 265.00034 6.071 904.90392 36.449 198.375 3.7315 13JB028-132 1328.3 412544.3 2.143 16.709505 2.52 0.2763765 4.76 0.0334937 4.04 212.37731 8.446 247.77909 10.47 598.01665 54.553 212.377 8.446 13JB028-292 948.43 56450.58 3.164 20.367542 2.25 0.2296403 3.83 0.0339223 3.1 215.05004 6.556 209.90169 7.268 152.52314 52.808 215.05 6.5563 13JB028-149 1035.9 143895.3 2.421 19.237072 2.51 0.2512237 3.61 0.0350508 2.59 222.08241 5.656 227.56969 7.353 284.68323 57.378 222.082 5.6563 13JB028-327 562.92 36913.18 0.845 18.155927 5.01 0.2683821 7.09 0.0353403 5.02 223.88525 11.05 241.39933 15.24 415.38599 111.99 223.885 11.049 13JB028-314 377.29 185404.6 1.284 19.135419 2.11 0.256559 2.85 0.0356061 1.92 225.53953 4.256 231.89015 5.914 296.78619 48.134 225.54 4.2558 13JB028-254 277.54 38768.51 0.687 19.165079 2.84 0.259914 4.54 0.0361276 3.55 228.78516 7.968 234.59764 9.516 293.20796 64.869 228.785 7.9682 13JB028-119 711.2 187822.6 1.756 19.800331 2 0.2527457 2.89 0.0362957 2.08 229.83086 4.688 228.8041 5.912 218.24242 46.408 229.831 4.6879 13JB028-325 107.85 15361.35 1.903 19.429664 3.63 0.2611147 6.35 0.0367955 5.21 232.93959 11.92 235.56479 13.35 261.83509 83.42 232.94 11.921 13JB028-194 190.03 21559.24 1.215 19.157386 3 0.2651253 4.25 0.0368372 3.01 233.19828 6.884 238.78879 9.04 294.1454 68.549 233.198 6.8842 13JB028-207 422.91 32647.26 1.989 17.592337 5.25 0.2907842 6.06 0.0371016 3.01 234.84247 6.945 259.17649 13.85 485.4328 116.06 234.842 6.9451 13JB028-190 728.09 151335.4 1.985 19.573947 2.52 0.2646952 3.91 0.0375771 2.99 237.79708 6.979 238.44353 8.313 244.81626 58.133 237.797 6.9786 13JB028-136 980.82 70237.78 1.549 19.611097 2.17 0.2725103 3.64 0.03876 2.91 245.14218 7.008 244.69879 7.906 240.45586 50.118 245.142 7.008 13JB028-307 1520.9 183624.6 16.19 19.671599 2.19 0.2745972 4.76 0.0391773 4.23 247.73141 10.28 246.36256 10.42 233.36471 50.577 247.731 10.277

178 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13JB028-293 382.75 53850.38 136.2 19.868797 2.96 0.2755482 3.5 0.0397071 1.86 251.01697 4.577 247.11989 7.673 210.27753 68.713 251.017 4.5771 13JB028-243 267.7 75985.23 1.252 19.36643 3 0.2989082 3.95 0.0419842 2.57 265.12041 6.668 265.54711 9.223 269.291 68.776 265.12 6.6675 13JB028-123 376.12 29563.37 3.001 19.215025 2.48 0.303266 3.93 0.0422633 3.06 266.84674 7.987 268.948 9.297 287.26058 56.684 266.847 7.9868 13JB028-309 716.92 113005.3 1.298 19.292968 1.88 0.3057026 3.32 0.0427757 2.74 270.01505 7.248 270.84462 7.895 278.04317 42.939 270.015 7.2476 13JB028-175 491.42 118303.5 2.139 18.681597 2.17 0.3184902 2.72 0.0431528 1.64 272.34586 4.36 280.74053 6.662 351.2811 49.013 272.346 4.3604 13JB028-133 772.38 97419.27 1.939 19.418197 1.76 0.3076542 2.69 0.0433282 2.03 273.42965 5.447 272.36108 6.432 263.19181 40.488 273.43 5.4469 13JB028-283 373.61 65109.61 1.109 18.556107 3.08 0.3219768 5.45 0.0433321 4.5 273.45419 12.03 283.42207 13.48 366.45952 69.487 273.454 12.035 13JB028-181 1764.3 29273.35 0.679 17.235792 2.87 0.3498415 4.74 0.0437322 3.77 275.9255 10.18 304.60193 12.47 530.49324 62.899 275.926 10.185 13JB028-252 98.926 28715.05 1.084 18.674987 4.74 0.3305056 5.47 0.0447649 2.72 282.30075 7.509 289.95178 13.79 352.07881 107.24 282.301 7.5085 13JB028-275 251.74 28473.47 1.887 19.491659 3.95 0.3208707 4.7 0.0453605 2.55 285.97438 7.136 282.5721 11.59 254.48931 90.815 285.974 7.1363 13JB028-282 791.75 52199.23 2.402 19.267616 1.91 0.3257734 3.61 0.0455242 3.06 286.98396 8.579 286.33394 8.996 281.05348 43.75 286.984 8.5795 13JB028-253 260.88 90770.82 2.35 19.51587 2.15 0.3239883 3.1 0.0458581 2.24 289.04228 6.339 284.96584 7.714 251.67867 49.409 289.042 6.3392 13JB028-210 194.73 29663.22 4.226 18.826067 3.27 0.3552174 4.25 0.0485012 2.73 305.31326 8.128 308.63773 11.32 333.81354 74.038 305.313 8.1283 13JB028-196 321.48 40740.39 6.161 18.513771 3.04 0.380141 3.67 0.0510433 2.06 320.92341 6.438 327.14187 10.26 371.60537 68.456 320.923 6.4377 13JB028-140 490.32 37879.68 13.54 18.500062 2.67 0.4123144 4.91 0.0553223 4.12 347.1152 13.94 350.54049 14.57 373.27268 60.115 347.115 13.937 13JB028-154 341.88 36772.01 3.571 17.867791 3.11 0.4493441 4.09 0.0582302 2.66 364.85373 9.424 376.81994 12.87 451.02341 69.024 364.854 9.4239 13JB028-169 885.19 217701 4.312 17.742155 2.39 0.5099733 3.38 0.0656225 2.39 409.72832 9.476 418.43123 11.59 466.67344 52.985 409.728 9.4757 13JB028-183 190.92 98310.99 1.445 17.946047 3.79 0.518607 6.19 0.0675003 4.9 421.07835 19.96 424.22043 21.48 441.30955 84.422 421.078 19.964 13JB028-228 695.91 111487.8 2.083 18.005247 1.73 0.5181637 3.17 0.0676651 2.65 422.07329 10.83 423.92394 10.98 433.9799 38.648 422.073 10.833 13JB028-313 775.84 224107.9 2.616 17.9713 2.24 0.5220269 3.11 0.0680411 2.15 424.34289 8.826 426.50448 10.82 438.18106 49.932 424.343 8.8258 13JB028-295 311.84 108883.1 1.019 17.516635 3.15 0.5395183 3.67 0.0685418 1.88 427.36453 7.767 438.10686 13.06 494.93517 69.509 427.365 7.7672 13JB028-308 224.36 43844.85 2.828 17.929869 2.45 0.5286047 3.15 0.0687396 1.97 428.55755 8.178 430.88325 11.05 443.31695 54.521 428.558 8.1785 13JB028-189 1182.5 104154 2.51 17.56294 1.64 0.5452877 3.57 0.0694579 3.16 432.88888 13.24 441.905 12.77 489.14183 36.29 432.889 13.242 13JB028-235 239.91 170994.5 1.228 17.725076 2.37 0.5721485 3.26 0.0735522 2.24 457.52101 9.88 459.40308 12.05 468.82615 52.553 457.521 9.8796 13JB028-330 963.26 102617.8 1.871 17.827935 1.56 0.5692116 3.13 0.0735993 2.71 457.8038 11.96 457.50455 11.51 456.00098 34.713 457.804 11.959 13JB028-251 1173.6 81100.58 2.102 17.287099 2.08 0.5888318 3.89 0.0738265 3.29 459.16781 14.57 470.12135 14.65 523.936 45.711 459.168 14.573 13JB028-270 559.09 49353.62 2.148 17.65729 1.72 0.5792816 4.27 0.0741844 3.91 461.31613 17.41 463.99965 15.92 477.28161 38.057 461.316 17.414 13JB028-202 256.45 25103.59 2.078 17.608857 2.41 0.5921141 3.41 0.0756198 2.42 469.92437 10.95 472.21685 12.89 483.39356 53.272 469.924 10.953 13JB028-162 251.04 117556.2 1.886 16.969054 2.1 0.6788841 4.4 0.0835511 3.86 517.2839 19.21 526.09973 18.06 564.51997 45.732 517.284 19.207 13JB028-286 50.964 35044.14 0.776 16.663846 4.29 0.7763796 4.89 0.0938314 2.34 578.15666 12.95 583.4161 21.71 603.92086 92.914 578.157 12.954 13JB028-171 321.12 83984.33 1.445 15.71946 1.82 0.8644265 2.58 0.0985518 1.83 605.91614 10.61 632.53644 12.15 728.88998 38.459 605.916 10.608 13JB028-284 419.71 100118.7 15.24 16.455813 1.9 0.8659379 5.81 0.1033486 5.49 634.00342 33.16 633.35921 27.39 631.08082 40.903 634.003 33.164 13JB028-113 148.91 183477.3 1.936 15.599369 2.55 0.9867711 4.17 0.1116406 3.3 682.26882 21.34 697.07141 21.04 745.08099 54.004 682.269 21.342 13JB028-244 647.15 119656.1 1.31 15.091177 1.76 1.0575063 5.36 0.1157457 5.06 706.03035 33.85 732.59353 27.98 814.74309 36.785 706.03 33.854 13JB028-285 181.47 26884.59 4.879 15.513803 1.91 1.0955543 3.87 0.1232682 3.37 749.34689 23.83 751.19876 20.57 756.69737 40.382 749.347 23.826 13JB028-153 566.91 38033.13 1.471 15.408882 1.68 1.110349 3.01 0.1240879 2.5 754.04949 17.8 758.34221 16.09 770.99941 35.28 754.049 17.798 13JB028-117 683.86 121506.4 2.075 15.308631 1.91 1.1244834 3.39 0.1248499 2.79 758.41798 19.99 765.12025 18.2 784.7255 40.187 758.418 19.992 13JB028-223 212.95 53449.01 2.489 15.156105 2.36 1.1372526 3.41 0.1250096 2.47 759.33307 17.66 771.20493 18.42 805.72137 49.34 759.333 17.658 13JB028-141 217.35 77808.38 2.001 15.45376 2.06 1.1165168 3.47 0.1251406 2.79 760.0837 20.01 761.3055 18.58 764.87498 43.408 760.084 20.008 13JB028-241 398.11 113364.9 2.273 15.68067 2.15 1.1101284 3.67 0.1262515 2.97 766.44556 21.47 758.23609 19.61 734.12407 45.62 766.446 21.47 13JB028-232 359.74 99831.39 1.419 15.644483 1.99 1.114941 3.03 0.1265062 2.29 767.90324 16.6 760.54924 16.24 738.97451 42.016 767.903 16.604 13JB028-212 305.79 211091.6 1.904 15.119528 2.61 1.1696969 3.82 0.1282656 2.78 777.96369 20.37 786.50302 20.89 810.77721 54.719 777.964 20.366 13JB028-182 325.51 84355.73 2.052 15.188984 2.18 1.168966 3.28 0.1287743 2.45 780.86956 17.99 786.1609 17.95 801.18349 45.764 780.87 17.988 13JB028-301 411.19 49965.84 1.253 15.296864 2.23 1.1624417 5.39 0.1289651 4.91 781.95909 36.14 783.10201 29.43 786.34033 46.797 781.959 36.137 13JB028-273 90.978 63726.68 1.49 15.460922 2.17 1.1558724 3.86 0.1296116 3.2 785.6496 23.63 780.01267 21.04 763.89866 45.795 785.65 23.634 13JB028-233 977.5 160316 2.079 14.929156 1.36 1.2123855 6.22 0.1312728 6.07 795.12241 45.39 806.28659 34.61 837.22664 28.246 795.122 45.39 13JB028-214 134.2 35286.55 0.851 15.225918 2.01 1.1914343 3.08 0.1315686 2.34 796.80793 17.51 796.62514 17.03 796.09387 42.222 796.808 17.512 13JB028-184 248.75 25569.59 3.519 15.266845 2.42 1.199188 2.94 0.1327808 1.66 803.70986 12.56 800.21139 16.28 790.46366 50.905 803.71 12.557 13JB028-245 197.43 49911.43 1.49 15.282281 2.54 1.2008028 5.06 0.133094 4.38 805.49216 33.18 800.95668 28.07 788.34276 53.316 805.492 33.181 13JB028-145 723.92 184491.1 1.514 15.07062 1.59 1.2283956 2.8 0.1342666 2.3 812.15986 17.54 813.60801 15.65 817.59104 33.262 812.16 17.538 13JB028-311 640.5 75876.38 1.31 14.894147 1.2 1.2533389 3.4 0.1353888 3.18 818.53466 24.45 824.91046 19.21 842.15295 25.067 818.535 24.447 13JB028-326 705.05 149045.4 9.812 15.069188 1.93 1.2400577 3.94 0.1355284 3.44 819.32723 26.47 818.90809 22.16 817.789 40.227 819.327 26.468 13JB028-180 114.72 38415.89 0.889 14.913612 2.8 1.2599161 3.98 0.1362772 2.84 823.57646 21.95 827.86991 22.56 839.39497 58.229 823.576 21.951 13JB028-204 821.33 190328.2 1.8 15.092689 1.83 1.2536081 3.31 0.1372231 2.76 828.94046 21.48 825.03175 18.71 814.53193 38.218 828.94 21.484 13JB028-146 280.96 61972.41 1.936 14.8222 1.73 1.2786728 4.89 0.1374583 4.57 830.2735 35.61 836.26256 27.86 852.20034 35.969 830.273 35.608 13JB028-248 129.29 170325.3 1.622 14.662166 2.31 1.3024195 4.1 0.1384993 3.38 836.17104 26.52 846.78937 23.54 874.73828 47.955 836.171 26.519 13JB028-120 150.02 43407.63 1.284 14.624728 2.47 1.3163302 3.29 0.1396212 2.17 842.52007 17.16 852.90562 18.98 879.99264 51.121 842.52 17.155 13JB028-143 207.45 43213.57 1.102 14.698163 2.03 1.3540684 4.99 0.1443452 4.55 869.18684 37.03 869.31521 29.13 869.64919 42.083 869.187 37.033 13JB028-277 1082.7 94548.43 2.794 14.399374 1.39 1.4060729 3.31 0.146842 3 883.2364 24.74 891.50219 19.61 912.03995 28.687 883.236 24.738 13JB028-170 345.98 107397 1.693 14.696566 1.78 1.3789868 4.21 0.1469856 3.81 884.04357 31.5 880.00679 24.78 869.84765 36.978 884.044 31.495 13JB028-237 242.7 98227.4 2.806 14.048964 2.18 1.6210445 3.54 0.1651726 2.79 985.45828 25.48 978.39559 22.25 962.59654 44.605 962.597 44.605 13JB028-176 1888.3 76446.78 28.12 14.040758 1.17 1.4709172 2.8 0.1497882 2.55 899.77582 21.42 918.50479 16.96 963.78928 23.869 963.789 23.869 13JB028-246 356.83 229482.7 1.855 13.815295 1.93 1.6892142 2.84 0.1692558 2.08 1008.0096 19.39 1004.4667 18.1 996.7391 39.29 996.739 39.29 13JB028-198 298.02 54320.47 2.373 13.745603 1.76 1.6894365 2.54 0.1684242 1.83 1003.4229 16.96 1004.5506 16.17 1006.9921 35.704 1006.99 35.704 13JB028-220 1016.8 241291.6 2.76 13.72703 0.96 1.6536125 2.85 0.16463 2.68 982.45586 24.43 990.93456 18.01 1009.7348 19.355 1009.73 19.355 13JB028-302 149.71 89477.14 1.039 13.691853 2.32 1.6943383 3.05 0.1682523 1.99 1002.4748 18.43 1006.3996 19.48 1014.9369 46.934 1014.94 46.934 13JB028-271 397.17 327747.4 2.531 13.488117 1.98 1.8920464 2.79 0.1850895 1.97 1094.7192 19.81 1078.3006 18.54 1045.2806 39.94 1045.28 39.94 13JB028-124 170.52 84455.73 1.22 12.936922 1.87 2.0311856 3.04 0.1905809 2.4 1124.521 24.78 1126.0129 20.71 1128.8728 37.245 1128.87 37.245 13JB028-213 475.05 154611.6 1.848 12.900468 2.01 2.0881346 5.59 0.1953722 5.22 1150.4114 54.97 1144.9126 38.4 1134.4925 39.973 1134.49 39.973 13JB028-266 159.24 139925.6 0.742 12.782611 2.14 1.9347787 3.12 0.1793699 2.27 1063.5315 22.27 1093.1939 20.88 1152.7334 42.398 1152.73 42.398 13JB028-260 269.42 1352944 3.042 12.209594 2.25 2.3486057 5.48 0.2079745 5 1218.0176 55.51 1227.1352 39.07 1243.213 44.022 1243.21 44.022 13JB028-128 390.12 175919 2.566 11.075328 1.61 3.2083595 3.8 0.2577142 3.44 1478.1367 45.46 1459.1795 29.42 1431.6691 30.711 1431.67 30.711 13JB028-298 194.4 109985.7 0.391 10.291429 1.5 3.7854879 2.75 0.2825506 2.31 1604.1952 32.82 1589.6715 22.13 1570.4471 28.078 1570.45 28.078 13JB028-186 401.18 130578.9 1.524 10.276762 1.27 3.7534546 2.63 0.2797604 2.3 1590.1554 32.37 1582.8518 21.05 1573.1182 23.8 1573.12 23.8 13JB028-118 62.144 101037.6 1.706 10.108265 1.88 3.7322653 2.85 0.27362 2.14 1559.1507 29.68 1578.3155 22.84 1604.0104 35.088 1604.01 35.088 13JB028-166 77.364 37195.73 2.3 9.9306309 2.92 3.42055 4.27 0.2463607 3.12 1419.6803 39.78 1509.1274 33.58 1637.0035 54.164 1637 54.164 13JB028-269 154.77 65655.77 3.055 9.8755948 1.74 3.6925005 2.93 0.2644737 2.35 1512.6899 31.72 1569.7473 23.38 1647.3178 32.243 1647.32 32.243

179 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13JB028-224 201.28 182691.7 4.109 9.8296302 1.91 3.9913788 4.91 0.2845502 4.52 1614.2375 64.51 1632.4437 39.85 1655.9656 35.467 1655.97 35.467 13JB028-148 47.758 60838.48 1.582 9.7118272 1.94 4.3584348 3.36 0.3069942 2.74 1725.8986 41.56 1704.495 27.79 1678.2676 35.928 1678.27 35.928 13JB028-226 321.44 190816.7 2.29 9.6048363 1.63 4.435937 2.65 0.3090111 2.09 1735.8386 31.83 1719.0759 21.97 1698.7059 30.01 1698.71 30.01 13JB028-173 68.23 31022.09 1.81 9.495004 2.4 3.7143812 3.04 0.2557881 1.87 1468.2569 24.53 1574.4709 24.34 1719.866 44.138 1719.87 44.138 13JB028-211 1063.9 95847.51 2.67 9.4226883 1.43 4.2612348 2.9 0.2912118 2.52 1647.5822 36.67 1685.9073 23.85 1733.9035 26.257 1733.9 26.257 13JB028-168 2293.7 317783.5 6.648 9.1835347 1.84 4.6185296 3.2 0.3076184 2.62 1728.9765 39.8 1752.6222 26.74 1780.9194 33.477 1780.92 33.477 13JB028-222 1130.2 89234.14 1.945 9.1796757 1.61 4.3547607 2.57 0.2899281 2 1641.1701 29.02 1703.7986 21.2 1781.6859 29.301 1781.69 29.301 13JB028-139 76.187 112350.7 1.978 9.0715485 1.92 4.672479 4.41 0.3074167 3.97 1727.9822 60.15 1762.3255 36.87 1803.2651 34.847 1803.27 34.847 13JB028-138 436.06 97828.55 1.933 9.0305463 1.94 5.0708565 2.91 0.3321193 2.16 1848.6453 34.77 1831.243 24.66 1811.5001 35.283 1811.5 35.283 13JB028-318 207.9 235986 2.703 9.0140014 1.43 4.9875807 2.24 0.3260666 1.72 1819.2883 27.26 1817.2183 18.92 1814.8313 25.975 1814.83 25.975 13JB028-174 339.92 139498.9 3.844 9.007666 1.22 4.5744997 3.87 0.2988509 3.67 1685.6082 54.5 1744.6338 32.27 1816.1081 22.161 1816.11 22.161 13JB028-164 249.3 183351.9 3.821 8.9948939 1.59 4.3654535 3.33 0.2847896 2.93 1615.439 41.87 1705.8241 27.54 1818.6806 28.853 1818.68 28.853 13JB028-188 1896.3 66047.86 212.4 8.991507 1.67 4.4665577 3.31 0.2912756 2.86 1647.9007 41.62 1724.7795 27.51 1819.3643 30.347 1819.36 30.347 13JB028-142 432 163763.7 2.284 8.9832138 2.39 4.4187995 4.24 0.2878954 3.51 1631.0036 50.53 1715.8697 35.16 1821.0391 43.4 1821.04 43.4 13JB028-127 525.9 73645.46 2.264 8.9627239 1.72 4.4142132 3.24 0.2869406 2.74 1626.2227 39.42 1715.01 26.82 1825.1823 31.248 1825.18 31.248 13JB028-316 100.08 50995.11 1.426 8.9394302 1.74 5.1833275 3 0.3360603 2.44 1867.6887 39.58 1849.8823 25.53 1829.9013 31.585 1829.9 31.585 13JB028-111 1203 410327.9 9.144 8.9260723 1.34 4.3853804 3.35 0.2839007 3.07 1610.9772 43.7 1709.5882 27.68 1832.6118 24.355 1832.61 24.355 13JB028-231 469.44 190445.4 1.442 8.8991123 1.69 4.5855433 5.26 0.2959622 4.98 1671.2549 73.39 1746.6434 43.91 1838.092 30.684 1838.09 30.684 13JB028-303 437.57 194735.1 1.676 8.8633552 1.88 5.0655093 3.66 0.3256267 3.14 1817.1496 49.76 1830.3483 31.07 1845.3803 34.055 1845.38 34.055 13JB028-199 2179.9 626722 14.87 8.8247747 1.46 5.1960987 2.31 0.3325675 1.78 1850.8138 28.68 1851.9773 19.65 1853.2699 26.474 1853.27 26.474 13JB028-230 234.68 240632.7 3.055 8.8122122 1.76 5.0211816 3.3 0.3209147 2.8 1794.1947 43.81 1822.9005 27.98 1855.8409 31.772 1855.84 31.772 13JB028-137 243.95 51800.43 1.515 8.8082198 2.06 5.2121224 2.94 0.3329672 2.1 1852.7475 33.76 1854.5998 25.03 1856.6598 37.192 1856.66 37.192 13JB028-297 270.8 41422.17 2.171 8.8059338 1.21 5.0829716 2.5 0.3246324 2.19 1812.3124 34.63 1833.2673 21.26 1857.1289 21.902 1857.13 21.902 13JB028-206 288.14 167520.6 2.536 8.8001333 1.24 5.1154317 2.36 0.3264903 2.01 1821.3478 31.88 1838.6712 20.07 1858.3194 22.461 1858.32 22.461 13JB028-135 515.07 105259.9 3.622 8.7946766 1.61 4.9968842 2.73 0.3187263 2.2 1783.5058 34.34 1818.7948 23.1 1859.4399 29.085 1859.44 29.085 13JB028-160 174.6 190881.5 4.141 8.7791316 1.79 5.4629937 4.28 0.3478412 3.88 1924.2816 64.6 1894.7988 36.73 1862.635 32.405 1862.63 32.405 13JB028-122 294.49 127330 2.017 8.7685048 1.68 5.0700775 3.92 0.3224325 3.54 1801.5979 55.71 1831.1127 33.29 1864.8217 30.367 1864.82 30.367 13JB028-167 222.13 234721.8 2.503 8.7679342 1.97 5.1857342 3.09 0.3297663 2.38 1837.2487 38.04 1850.2774 26.31 1864.9392 35.576 1864.94 35.576 13JB028-236 120.16 106702.6 1.285 8.7664378 1.76 4.7340629 2.58 0.3009927 1.89 1696.2292 28.24 1773.2897 21.66 1865.2473 31.71 1865.25 31.71 13JB028-131 920.35 82500.21 4.881 8.7639211 1.62 5.3313061 2.64 0.3388682 2.08 1881.2224 33.92 1873.8961 22.54 1865.7656 29.264 1865.77 29.264 13JB028-203 1621.7 123984.4 4.389 8.7601417 1.67 4.8838149 3.21 0.3102909 2.74 1742.1381 41.78 1799.4673 27.05 1866.5441 30.226 1866.54 30.226 13JB028-225 572.88 391085.1 7.684 8.7540008 1.43 5.3654341 3.47 0.3406514 3.16 1889.8025 51.84 1879.3547 29.73 1867.8097 25.778 1867.81 25.778 13JB028-296 378.96 141574.5 3.014 8.7527675 1.44 5.1681749 2.36 0.3280812 1.87 1829.0745 29.78 1847.391 20.08 1868.0639 25.97 1868.06 25.97 13JB028-216 260.83 154220.7 2.9 8.7313283 1.29 4.7121092 3.12 0.298397 2.84 1683.3547 42.11 1769.3947 26.14 1872.4882 23.206 1872.49 23.206 13JB028-261 219.05 89969.52 1.222 8.7184218 1.23 5.1654922 2.4 0.3266242 2.06 1821.9984 32.63 1846.9493 20.4 1875.1557 22.256 1875.16 22.256 13JB028-217 215.03 103286.1 1.152 8.7176135 1.31 5.016439 2.72 0.3171698 2.38 1775.8928 36.97 1822.1004 23 1875.3229 23.545 1875.32 23.545 13JB028-177 334.67 310906.9 3.071 8.7162537 2.39 5.2159757 4.23 0.3297343 3.49 1837.0937 55.84 1855.2294 36.09 1875.6041 43.145 1875.6 43.145 13JB028-289 485.98 144968.9 2.723 8.7149408 2.14 4.9889789 3.74 0.3153369 3.06 1766.9161 47.35 1817.4554 31.63 1875.8757 38.598 1875.88 38.598 13JB028-257 453.32 142640.4 2.828 8.6888969 1.91 5.397004 3.54 0.3401074 2.97 1887.1863 48.66 1884.3781 30.3 1881.2695 34.451 1881.27 34.451 13JB028-242 909.22 1699641 1.593 8.6886208 1.69 4.7864767 6.32 0.3016237 6.1 1699.3554 91.07 1782.5289 53.17 1881.3268 30.38 1881.33 30.38 13JB028-262 460.21 219651.2 3.582 8.680701 2.03 5.2516627 3.23 0.3306362 2.52 1841.4643 40.36 1861.0423 27.59 1882.9695 36.533 1882.97 36.533 13JB028-185 846.75 69450.28 13.34 8.673831 2.16 5.6709482 2.95 0.3567511 2 1966.7556 33.98 1926.9554 25.47 1884.3955 38.975 1884.4 38.975 13JB028-121 414.57 131825.7 1.345 8.669063 1.65 5.2535883 2.69 0.330314 2.13 1839.9031 34.01 1861.355 22.94 1885.3857 29.68 1885.39 29.68 13JB028-165 348.6 104004.7 2.604 8.6643434 2.01 5.5811738 4.12 0.3507195 3.59 1938.0333 60.13 1913.1981 35.48 1886.3663 36.28 1886.37 36.28 13JB028-258 1121.5 3933275 4.31 8.6640915 1.51 5.2581211 2.58 0.3304094 2.09 1840.3654 33.38 1862.0907 21.98 1886.4186 27.227 1886.42 27.227 13JB028-278 890.46 1161581 3.351 8.6629106 2.02 5.3575874 2.95 0.3366137 2.14 1870.3584 34.72 1878.1022 25.21 1886.6641 36.458 1886.66 36.458 13JB028-126 710.72 68575.76 2.139 8.6611726 1.49 5.3360791 5.55 0.3351951 5.34 1863.5129 86.48 1874.6612 47.47 1887.0253 26.785 1887.03 26.785 13JB028-116 1274.5 185383.9 9.616 8.658857 1.36 4.2939948 3.84 0.2696627 3.59 1539.0894 49.2 1692.2101 31.66 1887.5067 24.528 1887.51 24.528 13JB028-255 488.09 187520.2 3.748 8.6534615 1.29 5.4665031 3.19 0.3430822 2.92 1901.4802 48.05 1895.35 27.4 1888.6288 23.249 1888.63 23.249 13JB028-158 468.2 150695.5 4.469 8.640936 1.58 5.5985651 2.8 0.3508619 2.31 1938.713 38.74 1915.8778 24.14 1891.2318 28.444 1891.23 28.444 13JB028-291 646.58 75686.79 1.258 8.6207468 1.45 5.0159815 4.12 0.313617 3.86 1758.481 59.37 1822.0232 34.91 1895.4402 26.133 1895.44 26.133 13JB028-294 729.15 196662.4 2.698 8.6130512 2.08 5.2652537 3.45 0.3289085 2.75 1833.0888 43.91 1863.2473 29.44 1897.0463 37.387 1897.05 37.387 13JB028-240 705.92 551101 8.065 8.6085076 1.47 5.4035638 3.08 0.3373703 2.71 1874.0064 44.02 1885.4188 26.4 1897.9951 26.452 1898 26.452 13JB028-195 605.93 74748.39 2.5 8.6007934 2.27 5.0113294 4 0.3126009 3.3 1753.4928 50.7 1821.2377 33.91 1899.607 40.721 1899.61 40.721 13JB028-267 602.84 232944.4 5.087 8.5972189 1.5 5.426963 2.79 0.3383869 2.34 1878.9048 38.21 1889.1223 23.88 1900.3542 27.033 1900.35 27.033 13JB028-268 730.28 94232.34 0.94 8.580791 1.71 4.9756718 3.28 0.3096548 2.8 1739.0077 42.66 1815.1968 27.72 1903.7916 30.66 1903.79 30.66 13JB028-249 505.03 116084 1.911 8.5729753 1.47 5.4247778 2.68 0.3372968 2.25 1873.6521 36.53 1888.777 23.01 1905.4288 26.366 1905.43 26.366 13JB028-272 471.79 98983.46 4.945 8.5587917 2.12 5.5567941 3.1 0.3449336 2.26 1910.3603 37.37 1909.4296 26.69 1908.4029 38.115 1908.4 38.115 13JB028-163 555 244616.6 6.294 8.5581203 0.96 4.9747871 3.37 0.3087817 3.23 1734.709 49.14 1815.0464 28.51 1908.5437 17.271 1908.54 17.271 13JB028-150 1496.1 176539.5 3.516 8.4590027 1.2 5.1999196 2.76 0.3190175 2.49 1784.9292 38.81 1852.6033 23.54 1929.4333 21.494 1929.43 21.494 13JB028-305 200.29 174382.6 3.191 8.4161 1.65 5.4389535 3.08 0.33199 2.6 1848.0196 41.84 1891.0149 26.43 1938.5369 29.446 1938.54 29.446 13JB028-322 1162.5 561150.9 4.351 8.2262377 1.66 6.0945842 3.14 0.3636169 2.66 1999.2951 45.77 1989.4722 27.39 1979.2655 29.633 1979.27 29.633 13JB028-290 750.53 75716.37 2.578 8.0101526 1.23 6.1601058 3.62 0.357872 3.41 1972.0789 57.86 1998.8067 31.64 2026.5365 21.78 2026.54 21.78 13JB028-299 1017.5 341249.8 4.954 7.9027276 1.67 5.969481 3.73 0.3421467 3.34 1896.9884 54.89 1971.4076 32.48 2050.4134 29.458 2050.41 29.458 13JB028-287 89.002 208025.9 1.085 7.4983685 2.11 6.7309513 5.13 0.3660513 4.67 2010.7933 80.74 2076.6938 45.36 2142.6925 36.848 2142.69 36.848 13JB028-125 249.11 115797.2 2.262 7.4314566 1.61 7.616068 3.33 0.4104909 2.92 2217.1653 54.79 2186.7582 29.94 2158.3432 28.091 2158.34 28.091 13JB028-172 699.19 78097.73 2.071 7.2290774 1.78 7.7168567 3.37 0.4045964 2.86 2190.1693 53.19 2198.567 30.3 2206.3923 30.811 2206.39 30.811 13JB028-192 529.13 72983.61 4.987 6.8617344 1.51 8.1500125 3.62 0.4055934 3.29 2194.7435 61.17 2247.8096 32.73 2296.4692 25.944 2296.47 25.944 13JB028-320 1201 6096368 7.806 6.5166786 1.41 7.3990722 3.08 0.3497054 2.74 1933.1914 45.8 2160.8582 27.58 2384.7413 23.992 2384.74 23.992 13JB028-205 633.24 244492.4 3.157 6.4393109 2.14 7.9878732 4.78 0.3730519 4.27 2043.745 74.84 2229.6555 43.16 2405.0634 36.422 2405.06 36.422 13JB028-288 76.473 112734.9 1.468 6.4270285 2.06 9.4454944 3.86 0.4402847 3.26 2351.9151 64.26 2382.262 35.41 2408.3081 34.946 2408.31 34.946 13JB028-317 604.39 163476.3 7.01 6.3031795 1.52 9.5370653 2.53 0.4359866 2.02 2332.6488 39.54 2391.1246 23.23 2441.31 25.721 2441.31 25.721 13JB028-147 297.86 123074.5 1.881 6.2992027 1.4 9.2218625 3.06 0.4213111 2.72 2266.4289 51.99 2360.2872 28.05 2442.3787 23.763 2442.38 23.763 13JB028-321 230.57 212275 1.585 6.2918401 1.28 8.9145913 2.78 0.4067971 2.47 2200.2614 46.09 2329.2964 25.41 2444.3588 21.612 2444.36 21.612 13JB028-209 451.81 76343.65 1.273 6.2622657 1.48 10.322601 5.31 0.4688343 5.1 2478.447 104.9 2464.1324 49.19 2452.332 25.068 2452.33 25.068 13JB028-156 267.18 79198.78 1.48 6.2345206 1.47 9.4602306 2.77 0.4277633 2.35 2295.6267 45.42 2383.6935 25.48 2459.8403 24.889 2459.84 24.889 13JB028-218 1299.3 218212.8 2.999 6.2288462 2.05 9.3523051 3.39 0.4224983 2.7 2271.8112 51.68 2373.1626 31.09 2461.3794 34.612 2461.38 34.612

180 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13JB028-191 111.03 38241.97 0.612 6.2021285 1.33 9.930743 2.69 0.4467054 2.34 2380.5889 46.62 2428.3691 24.86 2468.6358 22.482 2468.64 22.482 13JB028-247 549.12 115775.6 3.54 6.1757645 2 8.2687049 3.7 0.3703624 3.11 2031.1057 54.25 2260.8962 33.55 2475.8274 33.783 2475.83 33.783 13JB028-115 501.49 236530.2 1.087 6.1682987 1.34 10.775474 2.62 0.4820594 2.25 2536.2293 47.13 2503.9538 24.33 2477.8686 22.656 2477.87 22.656 13JB028-215 791.6 66942.24 1.74 6.1114338 1.16 9.005242 2.87 0.399151 2.62 2165.1289 48.25 2338.538 26.21 2493.4832 19.497 2493.48 19.497 13JB028-179 107.09 126900.3 0.935 6.1030203 2.07 10.711657 7.68 0.474133 7.4 2501.6601 153.4 2498.436 71.45 2495.8037 34.79 2495.8 34.79 13JB028-323 195.19 70283.45 1.106 6.0932431 1.39 10.440788 2.83 0.4614031 2.46 2445.7503 50.06 2474.6763 26.19 2498.5036 23.422 2498.5 23.422 13JB028-264 631.74 361566.3 2.791 6.0733143 1.25 10.238493 3.78 0.4509834 3.56 2399.6229 71.36 2456.5616 34.94 2504.0181 21.071 2504.02 21.071 13JB028-197 346.63 201777.1 2.115 6.0605116 1.64 8.7168943 5.06 0.3831508 4.78 2090.9855 85.43 2308.8451 46.11 2507.5686 27.667 2507.57 27.667 13JB028-238 647.72 307617.8 3.099 5.9730892 1.46 10.181543 3.74 0.4410738 3.44 2355.446 67.91 2451.4032 34.57 2531.9766 24.427 2531.98 24.427 13JB028-279 174.06 242255.9 6.63 5.9143218 1.27 10.756989 2.43 0.4614178 2.07 2445.8152 42.18 2502.3586 22.6 2548.5559 21.347 2548.56 21.347 13JB028-219 61.04 194258.4 2.649 5.85969 1.54 11.081317 2.38 0.4709391 1.81 2487.6778 37.44 2529.9895 22.17 2564.0868 25.789 2564.09 25.789 13JB028-300 387.78 94512.23 3.165 5.5847239 1.75 11.437158 2.63 0.4632533 1.96 2453.9066 40.04 2559.4645 24.55 2644.166 29.054 2644.17 29.054 13JB028-112 246.99 184531 1.88 5.472952 1.6 11.65445 2.91 0.4626069 2.43 2451.0583 49.54 2577.0512 27.24 2677.674 26.555 2677.67 26.555 13JB028-280 413.01 164236.6 30.06 5.4557882 1.5 12.446833 3.13 0.49251 2.75 2581.5265 58.41 2638.7202 29.42 2682.8704 24.812 2682.87 24.812 13JB028-221 75.286 128286.8 1.972 5.372845 1.25 13.161042 2.38 0.5128535 2.02 2668.7999 44.17 2691.2673 22.42 2708.1723 20.599 2708.17 20.599 13JB028-200 531.27 84276.8 6.497 5.3512797 1.81 12.227884 3.49 0.4745781 2.99 2503.6061 61.94 2622.0511 32.76 2714.8065 29.781 2714.81 29.781 13JB028-329 291.95 453800.1 2.61 3.9286925 1.47 20.952548 2.76 0.5970127 2.34 3017.7911 56.33 3136.3997 26.74 3213.2052 23.148 3213.21 23.148 13JB015 (n=300)(29.77024, 100.39215) - Redbed coarse-grained sandstone/conglomerate 13JB015-271 5693.9 132906.3 2.931 21.503754 2.78 0.0355858 4.27 0.00555 3.24 35.678431 1.153 35.505175 1.49 23.82548 66.695 35.6784 1.1533 13JB015-31 633.82 17729.57 1.362 20.586841 4.4 0.0439123 5.25 0.0065565 2.86 42.128182 1.2 43.636553 2.242 127.37761 103.65 42.1282 1.2004 13JB015-157 3052.1 117421.8 2.792 21.319994 2.76 0.0436237 4.5 0.0067454 3.55 43.337653 1.531 43.355778 1.908 44.376967 66.07 43.3377 1.5313 13JB015-150 5113.2 49167.55 0.995 21.691297 2.06 0.048974 3.75 0.0077046 3.13 49.476697 1.541 48.548087 1.776 2.9336259 49.706 49.4767 1.5407 13JB015-27 3309.5 62556.46 1.623 21.073203 2.29 0.0508282 3.43 0.0077684 2.55 49.885124 1.268 50.34132 1.683 72.097312 54.449 49.8851 1.2679 13JB015-141 4393.6 5431.871 0.768 5.6889265 5.35 0.4345268 6.64 0.0179286 3.94 114.55115 4.474 366.38577 20.43 2613.4389 89.072 114.551 4.474 13JB015-81 3117.4 16894.16 2.908 10.726886 6.22 0.3331777 6.58 0.0259208 2.16 164.96727 3.511 291.98898 16.7 1492.4189 117.76 164.967 3.5108 13JB015-218 1630.5 50441.11 2.033 14.953623 2.88 0.2667178 4.22 0.0289266 3.08 183.82665 5.59 240.06616 9.023 833.85276 60.05 183.827 5.5903 13JB015-229 2592.6 136078.6 3.804 20.025859 1.81 0.2100686 2.67 0.0305106 1.97 193.74325 3.765 193.61022 4.715 192.0109 42.024 193.743 3.7654 13JB015-3 1427.8 23581.42 3.383 13.059391 3.18 0.3251714 3.99 0.0307988 2.41 195.54586 4.646 285.8728 9.952 1110.0785 63.613 195.546 4.6457 13JB015-276 2538.2 103116.3 5.908 20.039414 1.4 0.2164296 2.89 0.0314558 2.53 199.65302 4.971 198.93383 5.22 190.43723 32.519 199.653 4.9712 13JB015-282 2100.5 64684.25 4.87 19.626292 1.96 0.2220704 3.22 0.0316102 2.56 200.61831 5.063 203.63151 5.949 238.67104 45.106 200.618 5.0634 13JB015-93 158.98 67278.98 1.09 20.401139 3.85 0.2143057 4.85 0.0317093 2.95 201.23741 5.851 197.15942 8.693 148.64273 90.22 201.237 5.8509 13JB015-328 1862.1 111954.5 3.309 18.13755 1.88 0.2439511 4.41 0.0320908 3.99 203.6204 7.989 221.65066 8.772 417.64966 41.905 203.62 7.9892 13JB015-309 662.16 41772.89 2.777 20.048468 1.65 0.2226538 2.74 0.032375 2.19 205.39558 4.436 204.11609 5.074 189.34115 38.351 205.396 4.4355 13JB015-290 85.993 40754.33 1.638 20.523038 6.63 0.2175324 8 0.0323791 4.48 205.42083 9.052 199.85394 14.51 134.67787 155.86 205.421 9.052 13JB015-302 66.999 4065.964 2.665 22.398138 6.93 0.199413 7.69 0.032394 3.33 205.51394 6.731 184.62944 12.98 74.876185 169.58 205.514 6.7309 13JB015-231 1676.9 42099.44 2.984 19.756799 2.36 0.226342 3.9 0.0324325 3.1 205.75451 6.281 207.17444 7.309 223.3742 54.692 205.755 6.2812 13JB015-238 2592.6 139199.5 4.046 19.241365 1.7 0.2324092 2.73 0.0324331 2.13 205.75798 4.317 212.18554 5.223 284.13353 38.917 205.758 4.3171 13JB015-83 58.185 8298.344 2.249 20.560092 4.41 0.2180625 5.11 0.0325166 2.57 206.27948 5.224 200.296 9.288 130.43547 103.86 206.279 5.2244 13JB015-182 66.477 2983.493 1.034 21.394056 7.88 0.2102052 8.63 0.0326163 3.52 206.9023 7.169 193.72485 15.23 36.040443 188.95 206.902 7.1694 13JB015-19 982.38 81841.83 4.859 20.162998 2.28 0.2230416 4.24 0.0326167 3.57 206.9044 7.278 204.43812 7.846 176.07073 53.084 206.904 7.2775 13JB015-211 106.1 35263.3 2.331 21.15664 5.24 0.2138795 6.26 0.0328182 3.43 208.1623 7.017 196.80303 11.19 62.714328 124.76 208.162 7.0165 13JB015-281 367.53 39752.18 2.636 20.3262 3.76 0.2227377 4.44 0.0328359 2.35 208.2727 4.81 204.18579 8.206 157.26096 88.15 208.273 4.8097 13JB015-184 44.341 6774.273 2.074 19.907089 9.55 0.2277619 10.1 0.0328842 3.22 208.57438 6.603 208.34939 18.99 205.79242 222 208.574 6.6034 13JB015-308 588.71 54495.11 2.988 19.533936 3.06 0.2329246 4.13 0.0329992 2.77 209.29213 5.703 212.61008 7.916 249.53329 70.442 209.292 5.7033 13JB015-117 1070.4 40976.92 2.514 19.286837 1.9 0.2361677 3.91 0.0330354 3.42 209.51816 7.05 215.27747 7.589 278.7712 43.502 209.518 7.0502 13JB015-20 42.554 221020.4 2.587 18.976326 7.52 0.2405346 8.87 0.0331046 4.71 209.94968 9.739 218.85809 17.47 315.76138 171.17 209.95 9.7394 13JB015-317 378.93 76956.24 3.126 20.42433 3.31 0.2238667 4.92 0.0331616 3.63 210.30561 7.52 205.12288 9.135 145.99658 77.755 210.306 7.5195 13JB015-262 662.35 54276.41 1.37 19.664588 3.16 0.232516 3.99 0.0331617 2.43 210.30583 5.036 212.27359 7.643 234.18694 72.955 210.306 5.0358 13JB015-242 1063.2 34934.58 3.503 19.871004 2.35 0.2301106 3.63 0.0331631 2.77 210.31475 5.722 210.29001 6.89 210.03544 54.429 210.315 5.7219 13JB015-146 924.61 50596.95 1.747 18.938185 3.66 0.2416187 4.33 0.033187 2.3 210.46367 4.759 219.74509 8.548 320.37846 83.289 210.464 4.7593 13JB015-137 163.87 1443040 1.387 18.705302 4.52 0.2446573 6.5 0.0331911 4.68 210.48939 9.687 222.22697 12.98 348.38087 102.16 210.489 9.6872 13JB015-228 1148.1 26224.29 2.75 17.138517 2.49 0.2671233 3.48 0.0332035 2.44 210.56669 5.045 240.39113 7.454 542.83686 54.435 210.567 5.0452 13JB015-320 910.51 40727.18 2.443 19.888979 2.39 0.230325 3.18 0.033224 2.09 210.69489 4.334 210.46697 6.04 207.92688 55.465 210.695 4.3342 13JB015-210 50.784 8042.036 1.552 17.983224 8.96 0.2551586 9.69 0.0332795 3.68 211.04078 7.639 230.75791 20 436.70485 199.87 211.041 7.6389 13JB015-72 208.03 39094.13 3.009 19.917902 2.93 0.2304745 5.69 0.0332939 4.88 211.131 10.14 210.59029 10.83 204.56831 67.864 211.131 10.144 13JB015-127 1169.7 143021.8 3.471 19.684201 2.18 0.2332589 4.22 0.0333008 3.61 211.17389 7.508 212.88542 8.11 231.84073 50.473 211.174 7.5078 13JB015-6 1431.1 103299.3 2.931 18.744734 2.52 0.2450989 4.09 0.0333211 3.23 211.30047 6.709 222.58715 8.185 343.64083 57.04 211.3 6.7086 13JB015-135 865.63 137978.3 2.894 19.333038 3.25 0.2380088 4.52 0.0333727 3.13 211.62263 6.52 216.78866 8.815 273.24588 74.572 211.623 6.5197 13JB015-277 1226.9 70260.25 4.412 19.914178 1.96 0.2313348 5.24 0.033412 4.86 211.86736 10.14 211.3 10 205.00161 45.455 211.867 10.138 13JB015-243 256.12 18513.72 2.574 20.233051 3.97 0.2279028 4.87 0.0334433 2.82 212.06306 5.89 208.46592 9.175 167.97607 92.692 212.063 5.8901 13JB015-95 976.83 142563.3 4.26 19.376107 1.83 0.2380157 4.88 0.0334481 4.52 212.09243 9.434 216.7943 9.526 268.14496 42.058 212.092 9.4341 13JB015-198 538.73 79037.99 1.956 20.071778 3.27 0.2299018 5.19 0.0334678 4.04 212.2155 8.426 210.11763 9.859 186.63725 76.138 212.216 8.4265 13JB015-298 1075.1 98864.67 2.326 20.259442 2.53 0.2279715 3.69 0.0334971 2.7 212.39817 5.635 208.52277 6.965 164.92953 59.047 212.398 5.6349 13JB015-249 214.55 38329.9 2.68 19.763097 3.39 0.2340327 5.29 0.0335452 4.06 212.69828 8.491 213.52227 10.18 222.60691 78.437 212.698 8.4913 13JB015-199 400.77 29137.65 2.057 20.34681 3.23 0.2273421 3.91 0.0335486 2.2 212.71987 4.614 208.0022 7.351 154.90864 75.573 212.72 4.6139 13JB015-246 847.58 49815.82 6.323 19.562186 2.48 0.2365507 3.46 0.0335614 2.42 212.79957 5.057 215.59206 6.72 246.19267 57.039 212.8 5.0573 13JB015-129 1346 123632.4 2.937 19.0785 1.75 0.2426147 2.73 0.0335707 2.1 212.85722 4.392 220.55923 5.416 303.57955 39.908 212.857 4.3922 13JB015-215 996.96 54098.4 3.106 19.841206 2.87 0.2336045 3.37 0.0336161 1.77 213.14087 3.715 213.16988 6.488 213.51355 66.54 213.141 3.7145 13JB015-51 1134.5 86621.74 3.101 19.629242 1.94 0.2361953 4.29 0.0336259 3.83 213.20146 8.027 215.30012 8.33 238.29227 44.855 213.201 8.0272 13JB015-123 1472.8 50813.7 2.527 19.795544 2.53 0.2343737 3.26 0.0336492 2.05 213.34714 4.311 213.80282 6.277 218.80512 58.461 213.347 4.3113 13JB015-109 700.21 34354.4 3.43 20.128152 3.15 0.2305114 3.81 0.0336508 2.15 213.35679 4.513 210.62074 7.25 180.1045 73.342 213.357 4.5129 13JB015-134 1072.8 41003.88 2.316 19.932505 2.15 0.2329121 3.45 0.0336707 2.7 213.48131 5.675 212.59979 6.626 202.83724 49.939 213.481 5.6747 13JB015-50 1318.1 94962.29 6.34 19.80257 1.71 0.2344605 2.49 0.0336736 1.81 213.49936 3.799 213.87422 4.806 218.02692 39.678 213.499 3.7991 13JB015-292 178.59 14264.84 3.162 21.454026 4.06 0.2164871 5.83 0.0336852 4.19 213.57173 8.802 198.98186 10.54 29.373958 97.337 213.572 8.8016 13JB015-113 1439.7 63744.56 3.729 19.57491 1.98 0.2372988 5.15 0.0336895 4.75 213.5981 9.987 216.20616 10.03 244.69514 45.504 213.598 9.987 13JB015-82 874.92 33265.47 3.389 14.596575 8.74 0.3182331 9.48 0.0336895 3.69 213.59857 7.754 280.54252 23.25 884.019 180.97 213.599 7.7539 13JB015-108 753.74 49448.28 2.889 19.244823 2.36 0.2414499 4.12 0.0337008 3.38 213.66853 7.095 219.607 8.136 283.76167 54.012 213.669 7.0947

181 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13JB015-97 1145.5 47354.47 4.049 19.640928 2.13 0.2369676 2.65 0.0337559 1.58 214.01237 3.329 215.93427 5.163 236.94341 49.189 214.012 3.3291 13JB015-315 1318.8 60593.51 3.865 20.132037 2.03 0.2311993 2.85 0.0337577 2 214.02372 4.221 211.18827 5.439 179.65364 47.304 214.024 4.2207 13JB015-287 1140 40517.36 4.195 19.790673 2.17 0.2352498 3.3 0.0337667 2.49 214.07968 5.242 214.52321 6.387 219.41694 50.225 214.08 5.2424 13JB015-305 832.33 73014.38 4.602 20.16489 2.99 0.2310729 3.56 0.0337943 1.92 214.25193 4.056 211.08398 6.776 175.85224 69.724 214.252 4.056 13JB015-311 280.43 25203.19 2.128 20.808958 3.82 0.2240269 4.59 0.0338103 2.55 214.35171 5.367 205.25577 8.529 102.02998 90.34 214.352 5.3667 13JB015-280 689.07 59936.03 3.261 20.549586 2.49 0.2268997 3.57 0.033817 2.56 214.39372 5.394 207.6361 6.707 131.60944 58.644 214.394 5.3939 13JB015-324 1331.7 93692.84 1.446 19.926863 2.43 0.2341072 3.43 0.0338339 2.41 214.49893 5.093 213.58355 6.598 203.47993 56.401 214.499 5.0932 13JB015-7 503.52 94080.21 5.267 19.271505 2.4 0.2421137 3.56 0.0338403 2.63 214.53846 5.55 220.1498 7.042 280.59172 54.837 214.538 5.5496 13JB015-56 455.02 60026.85 4.76 19.597881 3.02 0.2382571 3.44 0.0338652 1.64 214.694 3.471 216.99228 6.718 242.00056 69.614 214.694 3.471 13JB015-266 1269.6 45951.37 1.823 20.027891 1.68 0.2332258 3.41 0.0338774 2.96 214.77028 6.258 212.85817 6.539 191.776 39.045 214.77 6.2579 13JB015-122 1091.6 126469.4 2.943 19.96432 2.83 0.2340984 3.89 0.0338963 2.67 214.8876 5.638 213.57637 7.484 199.15216 65.641 214.888 5.6378 13JB015-94 1247.9 118907.1 6.658 19.722495 1.64 0.2369937 3.08 0.0338998 2.61 214.90981 5.512 215.95573 5.989 227.39616 37.827 214.91 5.5121 13JB015-13 253.47 16744.23 4.001 20.255922 4.12 0.2307709 4.84 0.0339025 2.54 214.92652 5.364 210.83483 9.206 165.33537 96.219 214.927 5.3635 13JB015-24 544.87 99303.63 1.936 19.91973 2.79 0.2347095 5.02 0.0339088 4.18 214.96605 8.835 214.07905 9.696 204.31046 64.681 214.966 8.8349 13JB015-78 1474.6 165400 2.854 18.226965 2.03 0.2565405 2.96 0.0339132 2.15 214.99334 4.542 231.87519 6.13 406.65403 45.483 214.993 4.5421 13JB015-8 1254.6 104749.3 1.87 20.233 1.73 0.2312053 3 0.0339279 2.45 215.08477 5.192 211.19316 5.724 167.98199 40.364 215.085 5.1924 13JB015-288 1009.6 58943.5 4.14 19.787585 2.86 0.2366136 3.75 0.0339572 2.42 215.26726 5.133 215.64368 7.28 219.74834 66.137 215.267 5.1328 13JB015-15 663.16 102849.2 2.841 19.759808 1.91 0.2370757 3.45 0.0339757 2.88 215.38296 6.094 216.02304 6.721 223.01175 44.21 215.383 6.0937 13JB015-106 391.53 29199.82 2.718 19.939771 3.3 0.2350939 3.87 0.0339985 2.02 215.52528 4.273 214.39506 7.48 201.97647 76.703 215.525 4.2729 13JB015-168 1943.5 33418.35 2.752 18.884674 2.1 0.2482786 2.87 0.0340054 1.95 215.5679 4.138 225.17692 5.797 326.80551 47.747 215.568 4.1383 13JB015-64 969.19 142393.8 2.347 19.439358 1.54 0.2412517 3.1 0.0340135 2.69 215.6184 5.708 219.44486 6.12 260.70877 35.367 215.618 5.7082 13JB015-77 1268.3 1006582 2.29 19.524003 2.25 0.2403624 3.29 0.0340357 2.4 215.75667 5.088 218.71713 6.466 250.67529 51.724 215.757 5.0875 13JB015-289 385.72 152791.9 2.433 16.456106 5.11 0.2856195 5.83 0.034089 2.81 216.08896 5.961 255.10555 13.15 631.04244 110.11 216.089 5.9609 13JB015-272 796.18 79172.38 3.134 19.490992 2.33 0.2412825 4.51 0.0341082 3.85 216.20875 8.196 219.47006 8.893 254.61361 53.641 216.209 8.1963 13JB015-181 573.62 38274.87 1.898 19.837897 3.02 0.2371823 4.65 0.0341253 3.54 216.31566 7.533 216.11057 9.056 213.89911 69.917 216.316 7.5327 13JB015-286 984.65 34507.72 2.24 19.353436 2.04 0.243483 3.45 0.0341763 2.78 216.63363 5.924 221.26851 6.858 270.83031 46.796 216.634 5.9237 13JB015-196 1121.1 28562.91 1.643 19.887641 1.74 0.2369544 3.36 0.034178 2.87 216.64409 6.119 215.92345 6.534 208.05089 40.404 216.644 6.1193 13JB015-230 763.04 62164.82 1.793 19.522826 2.03 0.2414818 3.38 0.0341921 2.69 216.73197 5.743 219.63312 6.668 250.81542 46.81 216.732 5.7431 13JB015-98 1385.7 112622.7 4.31 19.802018 2.06 0.2381196 3.29 0.0341982 2.57 216.77003 5.47 216.87953 6.431 218.09072 47.788 216.77 5.4698 13JB015-32 192.75 35115.7 3.234 18.877293 3.87 0.2497862 4.34 0.0341985 1.97 216.77171 4.206 226.40246 8.807 327.6759 87.723 216.772 4.2064 13JB015-139 1048 159894.6 3.139 19.038874 2.15 0.2478622 3.92 0.0342255 3.28 216.94036 7 224.83814 7.908 308.27257 48.883 216.94 6.9997 13JB015-18 1285.1 49495.65 2.575 19.844186 1.82 0.2379364 2.57 0.0342447 1.82 217.05957 3.879 216.72925 5.025 213.12087 42.259 217.06 3.8794 13JB015-112 839.08 106552.7 2.723 19.949088 1.81 0.2370357 4.64 0.0342954 4.27 217.37569 9.134 215.99025 9.027 200.92325 41.956 217.376 9.1339 13JB015-53 127.31 12333.7 2.236 22.54018 4.51 0.2098281 5.33 0.034302 2.84 217.41706 6.077 193.40839 9.387 90.357902 110.62 217.417 6.077 13JB015-327 172.82 51790.99 2.964 21.375492 4.66 0.221412 5.45 0.0343254 2.81 217.56297 6.018 203.08429 10.03 38.117607 111.65 217.563 6.0177 13JB015-252 484.73 70703.75 3.196 20.214885 3.26 0.2344844 3.81 0.0343783 1.97 217.89224 4.215 213.89387 7.346 170.073 76.173 217.892 4.2149 13JB015-239 540.92 43303.74 2.983 20.371505 2.95 0.2327216 4.31 0.0343842 3.14 217.92909 6.736 212.44295 8.263 152.03309 69.137 217.929 6.7364 13JB015-130 949.49 162856.2 2.284 19.413449 2.57 0.2443221 5 0.0344005 4.29 218.03056 9.187 221.9535 9.964 263.72632 59.039 218.031 9.1872 13JB015-223 963.32 41409.12 2.819 20.082585 1.76 0.2362457 3.09 0.0344098 2.53 218.08882 5.435 215.34153 5.991 185.3836 41.056 218.089 5.4352 13JB015-236 862.08 99712.01 1.228 20.264371 2.41 0.2342333 3.74 0.0344255 2.85 218.18677 6.123 213.68736 7.199 164.36059 56.341 218.187 6.1233 13JB015-284 650.89 70226.77 1.347 19.886251 2.55 0.2387684 3.81 0.0344372 2.83 218.25984 6.08 217.41142 7.461 208.25772 59.134 218.26 6.0797 13JB015-57 548.36 130410.6 3.772 19.133969 3.14 0.248163 5.9 0.0344382 4.99 218.26593 10.71 225.08285 11.91 296.91466 71.722 218.266 10.715 13JB015-107 973.31 42746.28 1.961 19.871057 2.5 0.239351 3.69 0.0344949 2.71 218.61914 5.825 217.88889 7.228 209.98386 57.898 218.619 5.8254 13JB015-148 651.14 25244.89 1.854 20.569729 3.3 0.2312851 3.62 0.0345044 1.5 218.67857 3.23 211.25902 6.913 129.33302 77.613 218.679 3.23 13JB015-110 608.29 116519.6 3.166 19.474107 2.57 0.2443682 3.28 0.0345144 2.04 218.74092 4.381 221.99109 6.542 256.56899 59.117 218.741 4.3814 13JB015-151 403.21 36268.55 2.348 19.662536 4.15 0.2420297 4.95 0.0345149 2.69 218.74387 5.783 220.08111 9.789 234.42764 95.883 218.744 5.7827 13JB015-247 850.37 72581.31 1.324 19.444412 2.2 0.2449562 3.48 0.0345447 2.7 218.9297 5.807 222.47079 6.96 260.11203 50.642 218.93 5.8068 13JB015-176 727.86 35116.42 2.324 19.224805 2.22 0.2478361 2.98 0.0345561 1.99 219.00067 4.281 224.81687 6.017 286.10796 50.859 219.001 4.2808 13JB015-143 855.28 57352.05 3.1 20.277166 2.11 0.2350984 3.91 0.0345745 3.29 219.11496 7.085 214.39876 7.553 162.88572 49.328 219.115 7.0853 13JB015-306 355.24 33337.34 1.931 19.923354 3.19 0.2392917 3.92 0.0345771 2.27 219.1314 4.897 217.84026 7.687 203.88773 74.158 219.131 4.8967 13JB015-207 751.5 61949.01 1.571 19.675505 2.76 0.242352 3.72 0.0345837 2.5 219.17229 5.381 220.34456 7.368 232.86088 63.655 219.172 5.3809 13JB015-60 1380.4 141889.3 2.742 19.657416 2.34 0.2425891 3.41 0.0345857 2.49 219.1848 5.356 220.53832 6.765 235.02873 53.97 219.185 5.3561 13JB015-296 300.99 38226.08 3.563 19.902995 4.79 0.2398003 5.23 0.0346152 2.11 219.36873 4.543 218.25692 10.27 206.26568 111.08 219.369 4.5429 13JB015-222 181.09 35134.1 2.939 15.98514 11.8 0.2986008 12.1 0.0346183 2.33 219.38825 5.017 265.30681 28.19 693.22273 253.32 219.388 5.0167 13JB015-42 679.67 38349.54 3.483 18.954789 2.44 0.2519724 3.3 0.0346394 2.22 219.51964 4.793 228.17711 6.737 318.34359 55.375 219.52 4.793 13JB015-91 171.35 29162.95 4.736 17.602597 4.17 0.2717708 4.94 0.0346959 2.64 219.87159 5.703 244.10854 10.71 484.17849 92.148 219.872 5.7028 13JB015-28 958.28 77345.72 2.629 18.894103 2.28 0.25343 3.44 0.0347283 2.58 220.07308 5.579 229.35854 7.061 325.63648 51.683 220.073 5.5787 13JB015-235 434.82 45168.44 2.171 19.733353 2.8 0.242676 3.63 0.0347317 2.3 220.09474 4.982 220.60935 7.19 226.08418 64.761 220.095 4.9815 13JB015-133 457.74 22804.51 3.678 20.136413 2.94 0.2380665 3.9 0.034768 2.57 220.32038 5.557 216.83594 7.621 179.14762 68.584 220.32 5.5575 13JB015-187 623.95 36825.55 5.174 19.372618 2.11 0.2474611 3.07 0.0347691 2.23 220.3278 4.82 224.51171 6.176 268.55712 48.359 220.328 4.82 13JB015-84 1960.1 72059.95 4.099 18.488457 2.79 0.2593534 3.45 0.0347769 2.03 220.3764 4.401 234.14575 7.217 374.68521 62.777 220.376 4.4009 13JB015-62 728.05 228284.4 3.548 19.615359 1.89 0.2446181 3.96 0.0348003 3.48 220.52218 7.541 222.19497 7.901 239.941 43.591 220.522 7.5411 13JB015-9 1149.2 119487.5 1.353 18.849945 2.69 0.2549002 3.11 0.0348481 1.57 220.81959 3.418 230.54883 6.425 330.98092 60.971 220.82 3.4179 13JB015-125 728.16 64167.06 1.632 19.388108 2.6 0.2479567 3.78 0.0348666 2.75 220.93509 5.962 224.915 7.63 266.7273 59.69 220.935 5.9621 13JB015-54 1071.1 184834 2.455 19.511789 2.61 0.2464803 3.76 0.0348801 2.7 221.01914 5.858 223.71305 7.541 252.1603 60.144 221.019 5.8577 13JB015-136 1067.1 63947.77 1.996 19.636244 2.8 0.2450601 4.54 0.0349003 3.57 221.14513 7.771 222.55551 9.08 237.51544 64.679 221.145 7.7713 13JB015-47 572.91 51799.67 5.453 19.407403 1.63 0.2480489 3.09 0.0349143 2.63 221.23207 5.716 224.99001 6.246 264.46248 37.538 221.232 5.7155 13JB015-105 521.23 31122.89 1.57 17.152258 2.39 0.2808238 2.94 0.0349344 1.7 221.35756 3.703 251.31081 6.535 541.10258 52.314 221.358 3.7027 13JB015-178 237.74 41019.1 2.661 19.427355 4.96 0.2480461 5.47 0.0349498 2.31 221.45326 5.02 224.98781 11.04 262.10099 113.96 221.453 5.0198 13JB015-275 331.76 28118.86 2.669 19.291696 3.85 0.2498332 5.16 0.0349558 3.43 221.49059 7.471 226.4407 10.47 278.19348 88.241 221.491 7.4709 13JB015-241 730.62 34523.88 2.634 19.963998 2.09 0.2414594 2.92 0.0349615 2.04 221.52617 4.439 219.61476 5.759 199.17327 48.427 221.526 4.4389 13JB015-80 479.51 28638.03 16.75 19.279131 3.04 0.2501717 4.73 0.0349804 3.62 221.64356 7.884 226.71564 9.606 279.6865 69.659 221.644 7.8838 13JB015-166 1168.4 182154.9 3.367 19.869522 2.7 0.2428115 4.24 0.0349909 3.27 221.70926 7.127 220.72002 8.418 210.176 62.673 221.709 7.1266 13JB015-322 1082.9 64422.03 2.953 19.868292 2.65 0.2428572 3.76 0.0349953 2.67 221.73686 5.82 220.75742 7.462 210.32388 61.384 221.737 5.8202 13JB015-5 523.29 48021.22 2.223 20.550118 2.71 0.2349568 4.9 0.0350188 4.08 221.8828 8.909 214.28234 9.471 131.56206 63.787 221.883 8.9086 13JB015-209 1556.1 161970.1 3.859 18.787086 3.01 0.257209 5.44 0.0350465 4.54 222.05533 9.901 232.41531 11.31 338.50913 68.224 222.055 9.9009 13JB015-145 598.14 44429.5 2.442 19.734529 2.75 0.2453115 3.62 0.035111 2.35 222.45726 5.143 222.76052 7.238 225.9425 63.565 222.457 5.1433

182 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13JB015-76 834.13 139291.1 2.802 19.321555 2.09 0.2506352 3.45 0.0351223 2.75 222.52746 6.006 227.09199 7.019 274.60765 47.842 222.527 6.006 13JB015-185 617.05 27384.84 2.774 19.174986 2.89 0.2527882 5.28 0.0351553 4.42 222.73291 9.67 228.83852 10.81 292.04808 65.934 222.733 9.6697 13JB015-301 1164.8 37447.15 1.629 18.265437 1.99 0.2657446 2.6 0.0352041 1.67 223.03694 3.667 239.28574 5.537 401.93319 44.511 223.037 3.6673 13JB015-283 450.9 42043.77 2.453 20.126271 3.01 0.241442 4.69 0.0352432 3.59 223.28014 7.887 219.60053 9.264 180.32211 70.268 223.28 7.887 13JB015-172 4630.1 57667.02 3.488 19.086713 1.87 0.254686 2.64 0.0352562 1.86 223.36108 4.074 230.37553 5.432 302.5568 42.667 223.361 4.074 13JB015-43 1048 44542.79 2.627 19.79238 2.04 0.2458049 3.97 0.0352848 3.41 223.53926 7.492 223.16274 7.961 219.19872 47.23 223.539 7.4922 13JB015-253 415.42 28990.51 1.949 20.194077 2.83 0.2410132 4.56 0.0352991 3.58 223.62846 7.87 219.24977 9.002 172.47751 66.069 223.628 7.87 13JB015-154 656.17 43691.93 2.049 19.933345 2.47 0.2443039 3.26 0.0353191 2.12 223.75288 4.663 221.93864 6.496 202.73142 57.438 223.753 4.6628 13JB015-36 1631.4 109583.1 4.92 19.28374 2.05 0.2526908 3.96 0.0353411 3.39 223.88973 7.457 228.75962 8.115 279.13873 46.98 223.89 7.4572 13JB015-68 1013.9 69149.14 1.892 19.640044 2.2 0.2481177 3.73 0.0353426 3.01 223.89961 6.629 225.04606 7.535 237.02975 50.858 223.9 6.6288 13JB015-248 695.61 36259.24 3.308 20.229863 2.25 0.2411572 3.63 0.0353828 2.86 224.14954 6.294 219.36762 7.169 168.34423 52.452 224.15 6.2938 13JB015-4 966.55 27387.84 4.26 19.940238 2.66 0.2449997 3.88 0.0354319 2.83 224.45539 6.237 222.50623 7.762 201.94015 61.869 224.455 6.237 13JB015-260 933.66 62716.12 2.897 20.233482 2.02 0.2415623 2.82 0.0354486 1.96 224.55902 4.317 219.69894 5.562 167.9265 47.313 224.559 4.3175 13JB015-258 760.31 153046.8 1.577 20.385406 2.21 0.2397693 3.42 0.0354496 2.61 224.56568 5.761 218.2315 6.711 150.42365 51.692 224.566 5.7609 13JB015-265 474.85 25553.31 2.269 20.671902 3.2 0.2364586 3.55 0.0354515 1.55 224.57719 3.424 215.5164 6.903 117.6386 75.445 224.577 3.4236 13JB015-85 3756.9 84484.55 2.576 19.082877 1.68 0.2572237 2.65 0.0356003 2.05 225.50365 4.549 232.42716 5.508 303.05003 38.25 225.504 4.5495 13JB015-160 1957.2 111262.3 3.328 18.860983 2.11 0.2614967 3.59 0.0357708 2.9 226.56519 6.462 235.8723 7.55 329.60977 47.799 226.565 6.4615 13JB015-186 607.1 41923.81 2.113 19.892118 3.59 0.2486019 4.41 0.0358661 2.55 227.15803 5.699 225.43984 8.908 207.57304 83.323 227.158 5.6986 13JB015-2 674.97 205166.6 3.086 19.66865 2.29 0.2516289 3.59 0.035895 2.76 227.33778 6.158 227.89847 7.32 233.71077 52.938 227.338 6.158 13JB015-195 717.47 41088.51 1.78 19.769401 2.37 0.2507336 2.87 0.0359505 1.63 227.68319 3.643 227.17194 5.847 221.90432 54.756 227.683 3.6428 13JB015-153 1141 54272.2 2.23 20.295692 2.12 0.2443816 3.02 0.0359725 2.14 227.82035 4.8 222.002 6.016 160.74937 49.637 227.82 4.7999 13JB015-177 847.99 91519.8 3.068 19.281326 2.25 0.2580114 6.12 0.0360807 5.69 228.49318 12.78 233.06314 12.74 279.42557 51.495 228.493 12.777 13JB015-21 801.35 51524.69 3.85 20.247265 2.18 0.2461726 3.95 0.0361497 3.3 228.92278 7.417 223.46243 7.924 166.33544 50.816 228.923 7.4167 13JB015-17 844.33 198658.9 4.788 20.157675 1.82 0.2473646 3.2 0.036164 2.63 229.01177 5.911 224.43316 6.438 176.68714 42.495 229.012 5.9112 13JB015-121 827.36 81199.5 1.426 19.083863 2.07 0.2640434 3.71 0.036546 3.07 231.38803 6.985 237.9201 7.862 302.89467 47.256 231.388 6.9848 13JB015-101 3298.6 120742.4 5.218 19.731354 2.09 0.2606728 2.93 0.0373037 2.06 236.09801 4.776 235.20897 6.158 226.3393 48.251 236.098 4.7761 13JB015-103 3648.2 184272 4.931 19.540135 1.96 0.269081 3.22 0.0381337 2.56 241.25453 6.051 241.95867 6.935 248.81419 45.151 241.255 6.0507 13JB015-14 2255.6 135100.9 5.062 20.030114 1.93 0.2633949 3.43 0.0382639 2.84 242.06296 6.741 237.39907 7.261 191.51744 44.799 242.063 6.7413 13JB015-158 419.79 95243.16 3.108 20.174836 4.07 0.262287 4.5 0.0383783 1.93 242.77291 4.604 236.50825 9.497 174.70233 94.877 242.773 4.6038 13JB015-221 969.32 44862.59 2.669 19.327424 2.04 0.2795336 2.98 0.0391838 2.17 247.77191 5.275 250.28752 6.614 273.91227 46.856 247.772 5.2751 13JB015-11 134.33 119221.3 3.284 19.334066 4.06 0.2839922 5.12 0.0398225 3.13 251.73256 7.729 253.81952 11.51 273.12442 92.974 251.733 7.7293 13JB015-244 271.57 27707.69 2.711 19.8412 2.15 0.2791112 3 0.0401646 2.09 253.85342 5.197 249.95223 6.645 213.51422 49.886 253.853 5.1971 13JB015-119 1156.8 62127.03 2.121 18.989391 1.9 0.2940883 3.87 0.040503 3.38 255.95025 8.471 261.77231 8.936 314.20958 43.17 255.95 8.4712 13JB015-304 441.41 46229.2 1.096 19.571597 2.73 0.2879904 3.18 0.0408793 1.64 258.28069 4.144 256.97634 7.229 245.11592 62.934 258.281 4.1445 13JB015-267 963.85 43453.78 4.79 17.840536 2.26 0.3230967 3.45 0.0418061 2.61 264.01801 6.748 284.28185 8.559 454.41612 50.193 264.018 6.7476 13JB015-197 861.9 142294.7 4.76 18.411277 2.47 0.3515063 6.3 0.046937 5.79 295.68932 16.74 305.85345 16.63 384.09265 55.461 295.689 16.739 13JB015-173 818.29 248833.1 5.863 17.950629 2.93 0.3607812 5.53 0.0469702 4.69 295.8934 13.57 312.79787 14.89 440.74164 65.199 295.893 13.572 13JB015-274 1219.2 141081 4.114 19.340801 1.92 0.3402607 3.44 0.0477293 2.86 300.56558 8.398 297.36926 8.88 272.32615 44.008 300.566 8.3982 13JB015-34 1170.2 185941.1 2.992 15.449674 5.34 0.4300198 5.86 0.0481844 2.42 303.36519 7.165 363.1906 17.91 765.43203 112.63 303.365 7.1655 13JB015-149 138.59 12783.01 2.029 17.850607 3.04 0.4510464 5.59 0.0583946 4.7 365.855 16.71 378.0118 17.66 453.15926 67.433 365.855 16.706 13JB015-278 743.43 71390.98 6.944 16.666772 1.99 0.4870274 3.19 0.0588713 2.49 368.7576 8.928 402.88273 10.6 603.541 42.988 368.758 8.928 13JB015-26 628.46 2202597 4.476 14.899135 2.3 0.5917169 3.69 0.0639402 2.88 399.54327 11.17 471.96348 13.91 841.45614 47.818 399.543 11.169 13JB015-114 472.27 133555.7 1.552 17.94976 1.81 0.5351602 2.56 0.0696693 1.82 434.16278 7.64 435.22848 9.075 440.84934 40.186 434.163 7.6397 13JB015-88 1016.5 74443.24 2.111 18.022355 1.72 0.5407575 4.01 0.0706826 3.62 440.26709 15.42 438.92386 14.29 431.86449 38.385 440.267 15.416 13JB015-163 200.58 108510.9 2.228 17.732142 2.31 0.5633259 3.64 0.0724469 2.82 450.88046 12.26 453.68891 13.33 467.95881 51.211 450.88 12.26 13JB015-48 861.08 57193.87 1.781 17.885669 1.77 0.559425 3.37 0.0725681 2.87 451.60918 12.52 451.15213 12.29 448.80229 39.364 451.609 12.522 13JB015-75 672.47 104616.6 2.858 17.675234 1.64 0.5775139 3.42 0.0740332 3 460.40858 13.35 462.86251 12.73 475.05196 36.356 460.409 13.351 13JB015-118 408.06 92847.83 0.755 16.855571 2.17 0.6511623 3.79 0.0796034 3.11 493.75485 14.79 509.19374 15.19 579.14977 47.076 493.755 14.795 13JB015-191 400.62 452267 0.619 17.351261 1.77 0.6345246 2.51 0.0798506 1.79 495.23102 8.51 498.91052 9.896 515.8056 38.772 495.231 8.5096 13JB015-74 400.38 114817.6 2.226 16.936166 3.03 0.6686726 3.81 0.0821348 2.32 508.85279 11.33 519.90505 15.52 568.78525 66.003 508.853 11.334 13JB015-234 681.78 203957.2 2.044 17.14604 1.63 0.6651867 2.66 0.0827192 2.1 512.33274 10.33 517.78164 10.78 541.9106 35.64 512.333 10.333 13JB015-174 193.57 32842.65 0.889 17.291141 2.64 0.6631417 3.64 0.0831627 2.5 514.97314 12.39 516.53389 14.73 523.42258 57.887 514.973 12.387 13JB015-297 1265.7 99408.71 10.64 17.257219 1.02 0.6736742 2.91 0.0843178 2.73 521.84412 13.66 522.94396 11.9 527.77128 22.415 521.844 13.661 13JB015-190 587.84 62759.24 3.36 17.016884 2.6 0.6841306 3.33 0.0844341 2.08 522.53515 10.45 529.26786 13.73 558.40627 56.615 522.535 10.445 13JB015-291 2265.6 186167.5 17.71 16.894291 1.47 0.7161351 2.86 0.0877473 2.45 542.20044 12.77 548.38273 12.12 574.17126 31.938 542.2 12.765 13JB015-256 601.29 70537.94 3.381 16.58522 1.62 0.8116115 3.12 0.0976266 2.66 600.48482 15.27 603.35762 14.19 614.14455 35.085 600.485 15.273 13JB015-120 331.7 130080.3 1.641 16.477544 2.1 0.8282056 2.77 0.0989759 1.8 608.40438 10.46 612.61608 12.72 628.19744 45.238 608.404 10.46 13JB015-219 743.77 79054.99 5.327 16.510114 1.82 0.8387831 2.95 0.1004381 2.31 616.9758 13.61 618.47388 13.65 623.93982 39.321 616.976 13.609 13JB015-216 306.27 49866.62 4.929 16.006296 2.06 0.8726922 4.16 0.1013096 3.61 622.07915 21.43 637.02803 19.69 690.42684 43.981 622.079 21.428 13JB015-69 1353 798446.9 2.726 16.390558 2.05 0.8548927 3.24 0.1016258 2.51 623.92983 14.92 627.33093 15.17 639.63377 44.181 623.93 14.918 13JB015-227 894.26 82908.84 3.194 16.591443 1.72 0.8675754 2.9 0.1043975 2.34 640.12855 14.23 634.2499 13.67 613.33345 37.097 640.129 14.23 13JB015-116 187.96 210057.4 1.884 15.478504 4.1 0.9305466 5.73 0.1044638 4 640.51554 24.41 667.9222 28.06 761.50319 86.537 640.516 24.405 13JB015-270 136.17 109514.5 3.959 15.458711 2.64 1.0431752 3.47 0.1169578 2.25 713.02989 15.22 725.49635 18.01 764.19995 55.697 713.03 15.219 13JB015-310 592.81 50164.08 1.824 15.774124 1.15 1.0883279 2.39 0.1245099 2.1 756.46906 15 747.69124 12.67 721.4875 24.33 756.469 15.004 13JB015-90 76.666 36434.98 3.005 14.874684 2.84 1.1574248 3.67 0.1248646 2.32 758.50224 16.57 780.74357 19.99 844.85991 59.192 758.502 16.574 13JB015-37 369.77 130783.1 4.124 15.234479 2.25 1.1715102 3.61 0.1294412 2.83 784.67665 20.89 787.35126 19.8 794.91536 47.253 784.677 20.888 13JB015-268 1046 166307.3 1.996 14.200776 1.8 1.2568783 3.75 0.1294506 3.29 784.73045 24.28 826.50412 21.2 940.60621 36.938 784.73 24.279 13JB015-220 232.41 232020.2 2.183 14.980796 2.1 1.2194442 2.79 0.1324938 1.83 802.07637 13.83 809.52104 15.55 830.03376 43.775 802.076 13.83 13JB015-144 495.95 201574.4 2.933 14.848373 1.82 1.2338782 2.97 0.132877 2.35 804.25744 17.75 816.10314 16.65 848.5192 37.73 804.257 17.754 13JB015-250 416.41 60043.31 2.8 15.33941 1.69 1.2050281 2.41 0.1340617 1.72 810.99482 13.09 802.90425 13.35 780.50553 35.454 810.995 13.087 13JB015-65 174.29 26283.52 7.333 14.700854 2.56 1.2589765 3.9 0.1342329 2.95 811.96811 22.47 827.44767 22.08 869.26217 53.016 811.968 22.469 13JB015-323 575.54 169086.4 14.38 15.189487 1.61 1.221753 2.63 0.1345939 2.08 814.01939 15.92 810.57678 14.71 801.11416 33.798 814.019 15.918 13JB015-49 874.72 239572.4 2.451 15.099968 1.65 1.2404157 4.73 0.1358445 4.43 821.12112 34.13 819.07036 26.57 813.52388 34.582 821.121 34.131 13JB015-325 677.82 59553.14 1.067 14.979497 1.42 1.2631693 2.53 0.1372327 2.09 828.9949 16.28 829.33054 14.33 830.23922 29.627 828.995 16.275 13JB015-212 569.07 86724.9 1.094 14.500093 1.79 1.3568806 3.62 0.1426958 3.15 859.88845 25.32 870.52747 21.17 897.6757 37.047 859.888 25.319 13JB015-167 1514.4 170939.1 6.764 14.36085 1.63 1.4924352 2.59 0.1554441 2.01 931.40885 17.46 927.30894 15.74 917.59341 33.473 917.593 33.473 13JB015-59 556.42 74230.73 4.015 14.263572 1.5 1.4299642 3.15 0.1479286 2.77 889.34156 23.01 901.53477 18.82 931.51863 30.774 931.519 30.774

183 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13JB015-233 481.15 52457.44 1.127 14.229024 1.79 1.5745029 2.6 0.1624865 1.9 970.58022 17.08 960.20356 16.18 936.52122 36.654 936.521 36.654 13JB015-204 860.8 95042.21 6.514 14.196501 1.57 1.5078935 3.05 0.1552568 2.61 930.36378 22.63 933.58699 18.6 941.22349 32.15 941.223 32.15 13JB015-203 1198.3 148823.2 1.423 14.171179 1.4 1.5167547 3.05 0.1558906 2.71 933.89956 23.55 937.16837 18.66 944.88003 28.7 944.88 28.7 13JB015-73 1518.1 86637.4 12.78 14.169144 1.37 1.5924451 2.83 0.1636465 2.47 977.00977 22.42 967.2554 17.63 945.16044 28.009 945.16 28.009 13JB015-63 77.989 35599.19 3.037 14.168363 2.97 1.3944335 3.61 0.1432901 2.06 863.24038 16.61 886.57832 21.37 945.24942 60.858 945.249 60.858 13JB015-300 321.53 50880.42 1.198 14.166697 1.36 1.5290479 2.69 0.1571044 2.32 940.66523 20.32 942.11595 16.51 945.51177 27.818 945.512 27.818 13JB015-180 176.5 35087 2.637 14.127709 2.25 1.4846484 4.05 0.1521227 3.37 912.8515 28.71 924.13176 24.6 951.16757 46.011 951.168 46.011 13JB015-321 68.216 57798.1 0.614 14.12687 3.19 1.4762796 4.3 0.1512562 2.88 908.00143 24.38 920.70596 26.01 951.2528 65.271 951.253 65.271 13JB015-224 131.98 30139.98 1.668 14.097118 2.4 1.5461072 3.27 0.158077 2.22 946.08132 19.51 948.94208 20.14 955.56394 49.038 955.564 49.038 13JB015-255 703.36 216503.2 1.404 14.081725 1.87 1.4391019 3.44 0.1469759 2.89 883.98922 23.89 905.34589 20.62 957.7968 38.115 957.797 38.115 13JB015-188 221.07 64660.35 0.813 14.047418 2.11 1.5739396 3.65 0.1603553 2.98 958.75101 26.53 959.98138 22.68 962.82005 43.14 962.82 43.14 13JB015-240 236.99 68011.25 0.996 14.024857 2.26 1.5822993 2.63 0.1609481 1.34 962.0434 12.02 963.27381 16.35 966.10333 46.055 966.103 46.055 13JB015-237 845.62 120866.3 0.543 13.980702 1.8 1.595822 2.91 0.1618125 2.29 966.84166 20.53 968.57716 18.17 972.49758 36.683 972.498 36.683 13JB015-329 305.15 51219.69 1.578 13.976274 2.21 1.5485438 3.99 0.1569689 3.33 939.91019 29.11 949.91331 24.64 973.18316 44.988 973.183 44.988 13JB015-175 1257 440181.4 2.19 13.969964 1.46 1.6133883 3.11 0.1634681 2.74 976.02099 24.85 975.42527 19.49 974.08058 29.818 974.081 29.818 13JB015-16 652.25 134629.1 4.254 13.969011 1.24 1.6296396 4.05 0.1651034 3.85 985.07536 35.18 981.71985 25.46 974.22067 25.242 974.221 25.242 13JB015-102 589.83 115966.5 4.915 13.94578 2.08 1.5951739 3.03 0.1613428 2.21 964.23476 19.75 968.32363 18.93 977.62559 42.442 977.626 42.442 13JB015-316 338.95 74481.51 1.177 13.8155 1.52 1.6257 2.54 0.1628942 2.04 972.84079 18.41 980.1975 15.99 996.71575 30.877 996.716 30.877 13JB015-326 167.05 138051 1.776 13.809467 1.92 1.5571409 3.93 0.1559565 3.43 934.26696 29.87 953.33278 24.33 997.58355 39.027 997.584 39.027 13JB015-30 400.57 190929.3 4.111 13.784654 1.53 1.7406522 2.95 0.174023 2.52 1034.2388 24.1 1023.705 19.04 1001.2362 31.135 1001.24 31.135 13JB015-307 90.979 29223.45 1.633 13.593025 2.58 1.7822336 4.8 0.1757031 4.05 1043.4576 38.97 1038.9948 31.21 1029.5984 52.129 1029.6 52.129 13JB015-314 234.06 59312.13 1.299 13.587454 2.24 1.6194011 3.14 0.1595847 2.2 954.46844 19.5 977.75875 19.71 1030.4268 45.336 1030.43 45.336 13JB015-40 643.42 129919.6 1.435 13.441432 2.25 1.7971155 4.43 0.1751944 3.81 1040.6678 36.64 1044.4115 28.89 1052.272 45.316 1052.27 45.316 13JB015-23 760.52 61223.52 5.435 13.328536 1.41 1.9601426 3.26 0.1894824 2.94 1118.5705 30.2 1101.9317 21.93 1069.2435 28.328 1069.24 28.328 13JB015-33 630.87 248315.5 9.451 13.119309 1.81 1.9497616 4.11 0.1855202 3.68 1097.0615 37.15 1098.3646 27.56 1100.9291 36.28 1100.93 36.28 13JB015-273 607.49 162346.3 1.257 13.071269 1.35 2.060954 2.63 0.1953821 2.26 1150.465 23.81 1135.9361 17.98 1108.2634 26.871 1108.26 26.871 13JB015-208 509.03 233813.3 2.3 12.937354 1.28 2.0177178 2.58 0.1893235 2.24 1117.7096 22.99 1121.4915 17.52 1128.8108 25.489 1128.81 25.489 13JB015-245 286.67 136664.7 1.926 12.927729 1.74 2.062079 2.87 0.193342 2.28 1139.454 23.82 1136.3092 19.63 1130.3083 34.683 1130.31 34.683 13JB015-159 1433 463831.7 1.382 12.909641 1.48 2.1030267 3.68 0.1969054 3.37 1158.6747 35.71 1149.7974 25.32 1133.0905 29.483 1133.09 29.483 13JB015-214 633.03 181243.2 1.704 12.852813 1.75 2.0359529 4.77 0.1897862 4.44 1120.2168 45.64 1127.6086 32.5 1141.8921 34.823 1141.89 34.823 13JB015-131 313.13 124517.6 1.547 12.79564 1.8 2.1159082 3.15 0.196362 2.58 1155.7475 27.32 1154.0038 21.71 1150.7337 35.769 1150.73 35.769 13JB015-58 399.86 82950.28 3.128 12.788742 1.53 1.9407765 4.09 0.1800123 3.79 1067.0415 37.31 1095.2669 27.42 1151.7815 30.348 1151.78 30.348 13JB015-87 349.37 131776.4 1.828 12.666586 1.27 2.0245587 2.64 0.1859896 2.32 1099.6135 23.42 1123.7906 17.97 1170.8467 25.194 1170.85 25.194 13JB015-12 183.99 98505.78 2.136 12.649213 1.82 2.2198344 2.56 0.2036492 1.79 1194.8943 19.58 1187.3178 17.91 1173.5629 36.065 1173.56 36.065 13JB015-330 570.12 231392.8 2.65 12.645079 1.13 2.2332473 2.47 0.2048128 2.19 1201.123 24.04 1191.5388 17.3 1174.2115 22.315 1174.21 22.315 13JB015-92 100.78 54955.17 5.838 12.636795 3.3 1.9912259 4.35 0.1824972 2.84 1080.6025 28.24 1112.5382 29.44 1175.5065 65.332 1175.51 65.332 13JB015-299 276.45 72620.73 5.107 12.567932 2.33 2.1515078 4.06 0.1961126 3.32 1154.4032 35.12 1165.5389 28.12 1186.3086 45.947 1186.31 45.947 13JB015-213 285.72 110203.6 1.117 12.475582 2.31 2.2346004 2.97 0.2021899 1.86 1187.0736 20.14 1191.9636 20.82 1200.8469 45.628 1200.85 45.628 13JB015-140 262.32 90174.29 1.309 12.309191 2.25 2.1938326 2.67 0.1958537 1.45 1153.0076 15.28 1179.0848 18.64 1227.2403 44.107 1227.24 44.107 13JB015-170 478.35 79521.23 2.008 11.5484 2.04 2.4384274 3.16 0.2042351 2.41 1198.0312 26.38 1254.0125 22.76 1351.4152 39.369 1351.42 39.369 13JB015-138 972.12 227461.4 1.533 11.136724 1.84 2.5394006 3.43 0.2051103 2.9 1202.7144 31.81 1283.4009 25.01 1421.1126 35.103 1421.11 35.103 13JB015-303 588.35 69780.49 5.04 11.105472 2.17 3.0579244 3.45 0.2462989 2.69 1419.3605 34.22 1422.2182 26.41 1426.4807 41.37 1426.48 41.37 13JB015-264 441.18 153848.4 3.145 10.871559 1.8 3.2252363 3.06 0.2543034 2.48 1460.6306 32.41 1463.2433 23.74 1467.0198 34.127 1467.02 34.127 13JB015-206 690.96 189482.1 0.596 10.3133 1.23 3.7174166 3.37 0.2780594 3.13 1581.5816 43.94 1575.1245 26.94 1566.4693 23.035 1566.47 23.035 13JB015-115 284.4 213856 2.385 10.228565 2.13 3.4898922 4.79 0.2588961 4.3 1484.1914 56.95 1524.9314 37.86 1581.9131 39.834 1581.91 39.834 13JB015-312 336.63 43995.83 1.183 10.091447 1.73 3.812092 4.51 0.2790073 4.17 1586.3608 58.61 1595.3007 36.32 1607.1154 32.298 1607.12 32.298 13JB015-225 634.52 50271.23 4.521 9.7780873 2.33 3.2774722 3.41 0.2324297 2.5 1347.2206 30.34 1475.7194 26.54 1665.6963 43.036 1665.7 43.036 13JB015-318 1300.8 80317.87 2.687 9.6497179 1.21 4.1685861 3.72 0.2917441 3.52 1650.2391 51.21 1667.8674 30.48 1690.1111 22.404 1690.11 22.404 13JB015-132 222.45 211174 2.832 9.2956736 2.39 4.5142023 4.06 0.3043411 3.28 1712.7994 49.38 1733.5909 33.76 1758.7576 43.685 1758.76 43.685 13JB015-142 213.17 198130.4 0.996 9.2909365 1.98 4.8445302 3.49 0.3264449 2.88 1821.1272 45.68 1792.6651 29.4 1759.6898 36.129 1759.69 36.129 13JB015-99 516.22 170560.8 1.719 8.9104871 1.73 4.8314006 2.7 0.312229 2.08 1751.6661 31.86 1790.3815 22.74 1835.7783 31.325 1835.78 31.325 13JB015-96 1094.9 146496.2 2.781 8.7888689 1.57 4.8926938 2.68 0.3118744 2.18 1749.924 33.36 1800.9984 22.61 1860.6331 28.295 1860.63 28.295 13JB015-10 305.05 84669.78 3.356 8.7881673 1.51 5.334249 2.88 0.3399933 2.45 1886.6372 40.11 1874.3679 24.64 1860.7773 27.315 1860.78 27.315 13JB015-261 477.85 77972.55 5.534 8.7556744 1.54 4.89886 2.62 0.3110881 2.13 1746.0589 32.51 1802.0603 22.13 1867.4647 27.78 1867.46 27.78 13JB015-128 949.02 225561.7 6.132 8.6725469 1.5 5.2338349 3.82 0.3292042 3.51 1834.5234 56.09 1858.1426 32.56 1884.6622 26.955 1884.66 26.955 13JB015-251 456.58 153191.6 5.999 8.6119929 1.31 5.0970406 3.24 0.3183615 2.96 1781.7221 46.1 1835.613 27.5 1897.2673 23.55 1897.27 23.55 13JB015-35 573.31 78831.43 13.4 8.3739265 1.01 4.7689758 2.15 0.2896363 1.89 1639.7114 27.42 1779.4533 18.04 1947.5215 18.125 1947.52 18.125 13JB015-152 661.69 82445.24 1.914 8.0498673 1.5 6.3678699 3.39 0.3717762 3.04 2037.7529 53.08 2027.8506 29.73 2017.7724 26.517 2017.77 26.517 13JB015-25 195.48 166613.9 1.95 7.9756232 1.59 6.1469809 4.29 0.3555701 3.99 1961.1416 67.47 1996.9437 37.52 2034.1845 28.111 2034.18 28.111 13JB015-162 475.92 143423.8 1.568 7.8127383 1.84 6.2062429 3.42 0.3516663 2.89 1942.5504 48.43 2005.3284 29.95 2070.6188 32.441 2070.62 32.441 13JB015-202 1181.5 370778.9 1.405 6.8413427 1.54 8.2965323 2.94 0.4116581 2.5 2222.4979 47.07 2263.9402 26.65 2301.5843 26.482 2301.58 26.482 13JB015-156 588.19 2354405 0.711 6.5618039 1.19 9.0565993 2.38 0.4310098 2.06 2310.2681 39.97 2343.7367 21.73 2372.9856 20.233 2372.99 20.233 13JB015-111 461.98 111629.2 3.08 6.4498903 1.53 9.1194151 6.26 0.4265972 6.07 2290.3597 117 2350.0593 57.32 2402.2727 26.047 2402.27 26.047 13JB015-55 593.69 634055.5 3.612 6.3793911 1.21 10.205074 1.84 0.4721653 1.39 2493.0497 28.79 2453.5378 17.05 2420.9411 20.493 2420.94 20.493 13JB015-189 649 73169.82 2.52 6.3134142 1.42 9.6935421 2.77 0.4438595 2.39 2367.8951 47.27 2406.0923 25.53 2438.562 23.973 2438.56 23.973 13JB015-319 545.77 55152.23 3.35 6.2962913 1.36 9.9126214 2.88 0.4526599 2.54 2407.0673 50.99 2426.6843 26.56 2443.1615 23.005 2443.16 23.005 13JB015-313 342.87 102628 1 6.2435693 1.1 10.070734 2.34 0.4560294 2.06 2422.0023 41.64 2441.2906 21.6 2457.3886 18.607 2457.39 18.607 13JB015-254 1003.3 160922.1 4.365 6.2362138 1.28 9.8796715 2.83 0.4468505 2.53 2381.2352 50.36 2423.6138 26.13 2459.3813 21.594 2459.38 21.594 13JB015-1 325.88 174706.7 0.977 6.1704144 1.38 10.161219 2.64 0.4547355 2.25 2416.2715 45.42 2449.556 24.43 2477.29 23.274 2477.29 23.274 13JB015-259 344.02 158953.8 2.461 6.1400634 1.7 10.382037 2.89 0.4623322 2.34 2449.8474 47.72 2469.4486 26.82 2485.6068 28.697 2485.61 28.697 13JB015-70 215.54 132529.1 2.049 6.1225223 1.72 10.025142 2.67 0.4451636 2.04 2373.7149 40.61 2437.1003 24.69 2490.4289 29.014 2490.43 29.014 13JB015-67 232.89 180308.8 0.898 6.1169111 1.65 9.889885 2.68 0.4387551 2.12 2345.0649 41.67 2424.5666 24.76 2491.9739 27.765 2491.97 27.765 13JB015-279 1302.8 160101.1 8.227 6.0885227 1.26 10.151048 2.24 0.4482513 1.85 2387.4734 36.86 2448.6302 20.7 2499.8084 21.295 2499.81 21.295 13JB015-104 670.05 62584.94 3.497 5.9741091 1.05 10.700108 2.11 0.4636178 1.83 2455.5119 37.29 2497.4342 19.57 2531.6901 17.665 2531.69 17.665 13JB015-193 513.38 76766.4 2.21 5.8581883 1.53 10.845119 2.79 0.4607829 2.33 2443.0139 47.34 2509.9415 25.93 2564.5155 25.672 2564.52 25.672 13JB015-100 190.67 80015.39 2.53 5.7208102 1.51 11.176826 2.9 0.4637402 2.48 2456.0512 50.57 2537.9851 27.03 2604.1295 25.142 2604.13 25.142 13JB015-44 306.3 1588711 3.217 5.4146173 1.29 12.859688 2.02 0.5050064 1.55 2635.276 33.63 2669.4263 19.07 2695.3852 21.391 2695.39 21.391

184 Isotope Ratios Apparent Ages

U 206Pb 206Pb* ± 207Pb* ± 206Pb* 206Pb* 207Pb* 206Pb* Analysis (ppm) /204Pb U/Th /207Pb* (%) /235U* (%) /238U ± (%) /238U* ± (Ma) /235U ± (Ma) /207Pb* ± (Ma) Best age ± (Ma) 13JB015-45 528.8 358925.6 6.272 5.3981479 1.58 13.024905 3.61 0.5099388 3.25 2656.3682 70.79 2681.4587 34.1 2700.4168 26.076 2700.42 26.076 13JB015-41 149.51 64215.65 1.921 5.1852346 1.23 14.062039 2.13 0.5288292 1.74 2736.5171 38.86 2753.8992 20.24 2766.6541 20.226 2766.65 20.226 13JB015-285 143.03 92245.91 0.963 5.153047 1.44 13.579241 3.21 0.5075027 2.87 2645.9592 62.3 2720.8191 30.39 2776.8686 23.634 2776.87 23.634 13JB015-164 142.78 95572.02 1.813 5.0079022 2.32 14.113931 3.4 0.5126283 2.49 2667.8403 54.46 2757.3914 32.28 2823.6086 37.842 2823.61 37.842 13JB015-183 1012.5 61817.53 3.686 4.61296 1.41 13.528635 4.02 0.4526186 3.76 2406.8838 75.58 2717.2884 38 2956.9183 22.707 2956.92 22.707 13JB015-263 531.54 148294.9 0.758 4.4574009 1.91 18.254485 3.84 0.5901332 3.33 2989.9614 79.59 3003.2432 36.96 3012.1344 30.734 3012.13 30.734 13JB015-29 199.62 79879.6 3.85 4.3270688 1.09 18.622743 2.56 0.584435 2.32 2966.8193 55.14 3022.4798 24.7 3059.6916 17.447 3059.69 17.447 13JB015-46 949.12 92671.04 3.87 4.2428235 1.26 16.33269 2.83 0.5025872 2.54 2624.9051 54.72 2896.4759 27.1 3091.1021 20.061 3091.1 20.061 13JB015-217 345.6 157712.5 1.544 4.1717514 1.41 20.054338 4.18 0.6067719 3.94 3057.0646 95.86 3093.9804 40.46 3118.0168 22.374 3118.02 22.374 13JB015-66 377.76 130785 4.556 3.4849583 1.85 24.292602 3.13 0.6140028 2.52 3086.01 61.8 3280.2071 30.52 3401.1295 28.861 3401.13 28.861

185

APPENDIX III Mula basin Hf isotope values

186 176Yb+ 176Lu)/ Volts 176Hf/1 176Lu/17 176Hf/17 E-Hf (0) E-Hf Sample ± (1σ) E-Hf (0) Age (Ma) 176Hf Hf 77Hf 7Hf 7Hf (T) ± (1σ) (T) (%) 13MB056a-149 15.93873 5.6656 0.28275 2.267E-05 0.001076 0.282748 -1.28897827 0.801761 -0.3417 44.1 13MB056a-4 19.74842 4.5899 0.28243 3.253E-05 0.001437 0.282424 -12.5865981 1.150363 -8.2694 203.1 13MB056a-262 6.967502 5.2456 0.28243 2.127E-05 0.000489 0.282429 -12.460076 0.752071 -2.7605 442 13MB056a-244 13.80501 4.1082 0.28169 2.769E-05 0.000837 0.28168 -38.7879601 0.979341 -27.151 536.8 13MB056a-231 14.79789 5.8585 0.28219 1.479E-05 0.001002 0.28217 -21.1311956 0.52292 -1.1385 921.1 13MB056a-234 24.41673 3.609 0.28199 3.314E-05 0.001829 0.281945 -27.9941813 1.172019 1.6716 1395.7 13MB056a-267 7.570097 2.8688 0.28172 3.792E-05 0.000696 0.281693 -37.6894124 1.340813 6.26236 1984.7 13MB056a-51 5.700216 4.1071 0.28115 2.033E-05 0.000359 0.281132 -57.8576631 0.718961 -1.99 2487.5 13MB056a-273 24.4386 5.5257 0.28112 2.469E-05 0.001444 0.281052 -58.8193114 0.87299 -4.2751 2510.6 13MB056a-8 4.876511 3.9717 0.28114 2.233E-05 0.000296 0.281127 -58.1324505 0.789717 -1.1146 2532.6 13MB056a-172 8.198027 5.1795 0.28072 2.569E-05 0.000571 0.28069 -72.8766648 0.908352 -2.0041 3155.9 13MB043-136 12.41882 3.6069 0.28271 2.356E-05 0.000796 0.282709 -2.68194444 0.83325 -1.7353 43.7 13MB043-197 29.41174 3.5971 0.28258 3.022E-05 0.001939 0.282576 -7.1185437 1.068575 -2.6564 213.1 13MB043-178 27.70412 3.1134 0.28245 3.295E-05 0.002804 0.282434 -12.0116285 1.165042 -7.6718 213.2 13MB043-257 15.12073 5.0363 0.28253 2.432E-05 0.00106 0.282525 -9.05261142 0.859961 -4.4631 213.3 13MB043-308 5.574654 3.5486 0.28268 2.629E-05 0.000344 0.282675 -3.77546923 0.929746 5.90208 438.7 13MB043-286 6.509923 4.6739 0.28237 1.902E-05 0.000428 0.282364 -14.6163708 0.672497 7.01007 977.8 13MB043-256 13.8898 3.4536 0.28212 2.445E-05 0.000966 0.282101 -23.4028457 0.864523 2.80635 1202.5 13MB043-313 12.03877 4.3155 0.28211 2.495E-05 0.000999 0.282083 -23.8900162 0.882284 7.09586 1419.6 13MB043-123 14.29641 2.1701 0.28155 2.893E-05 0.001082 0.281517 -43.5408796 1.022901 -4.1544 1804.6 13MB043-157 5.396328 3.8323 0.2812 2.5E-05 0.000337 0.281182 -56.1373337 0.884163 -1.1681 2446.6 13MB035-187 21.06571 2.6575 0.28286 3.164E-05 0.001331 0.282854 2.488663798 1.118877 3.3884 42.2 13MB035-246 11.20923 5.2789 0.28247 2.297E-05 0.000784 0.282464 -11.234895 0.812389 -6.8597 201.7 13MB035-143 10.87417 4.5766 0.28252 1.892E-05 0.000713 0.282517 -9.37164483 0.668908 -4.8053 210 13MB035-223 11.20631 4.8499 0.28224 2.722E-05 0.000986 0.282228 -19.1902739 0.962639 -2.7006 760.6 13MB035-126 18.40177 5.2455 0.28247 2.38E-05 0.001358 0.282449 -11.1165002 0.841644 7.05726 846.4 13MB035-254 14.81528 3.9262 0.2823 2.453E-05 0.00092 0.282278 -17.3257292 0.867469 4.60811 1006.6 13MB035-132 17.34825 4.7497 0.28194 2.456E-05 0.00114 0.281907 -29.9640038 0.868585 1.39627 1443.5 13MB035-241 14.37392 3.8721 0.28135 3.173E-05 0.000963 0.281305 -50.7350089 1.121947 3.35489 2452.4 13MB035-263 2.14777 4.8433 0.28229 2.742E-05 0.000135 0.282284 -17.6699789 0.969632 -6.5719 500.3 13MB035-59 14.3995 3.436 0.28051 2.655E-05 0.000884 0.28045 -80.3985441 0.938786 0.35761 3613.9 13MB035-176 9.414384 4.4524 0.28225 2.708E-05 0.00061 0.282242 -19.0410542 0.957737 -11.279 355.6 13MB035-169 12.90199 4.7391 0.28248 3.105E-05 0.000905 0.28247 -10.9267983 1.097879 -3.2061 356.6 13MB035-188 30.85914 4.0925 0.28191 2.78E-05 0.002401 0.281889 -31.1082665 0.983113 -23.724 358.2 13MB044_208 13.92063 4.5864 0.28276 2.145E-05 0.001035 0.282759 -0.89221229 0.758505 0.02836 42.8 13MB044_129 9.974451 2.6695 0.28268 2.495E-05 0.000636 0.282682 -3.62733434 0.88242 -2.6827 43.4 13MB044_255 12.43931 2.6716 0.28274 2.801E-05 0.000803 0.282737 -1.67249363 0.990385 -0.7324 43.4 13MB044_218 14.2641 4.2798 0.28276 2.305E-05 0.000946 0.28276 -0.8621939 0.815013 0.07384 43.4 13MB044_203 49.36017 3.1703 0.28267 3.398E-05 0.002784 0.282672 -3.90167719 1.201757 -3.0166 43.5 13MB044_237 18.77323 4.7217 0.28268 2.537E-05 0.001365 0.282679 -3.65516558 0.897122 -1.4976 101.3 13MB044_248 12.479 3.3388 0.28255 2.432E-05 0.000809 0.282543 -8.4493657 0.860191 -3.8199 213.5 13MB044_98 26.30631 4.8578 0.28242 2.301E-05 0.001656 0.282411 -12.857227 0.813595 -6.012 323.8 13MB044_328 13.51024 4.02 0.28214 3.358E-05 0.001015 0.282138 -22.6481396 1.187558 -15.659 324.4 13MB044_82 17.86966 2.5652 0.28228 2.766E-05 0.001261 0.282276 -17.7196004 0.978237 -10.765 325.1 13MB044_244 10.32624 4.5139 0.28211 2.451E-05 0.000606 0.282098 -23.8688298 0.866827 -1.5182 1016.5 13MB044_5 27.77098 4.3325 0.28202 2.861E-05 0.001431 0.281983 -27.0536372 1.011661 2.68617 1381.9 13MB044_215 8.17298 3.6029 0.28135 2.603E-05 0.000549 0.281328 -50.5868607 0.920589 4.84304 2480.6 13MB044_36 13.89406 3.6749 0.28065 2.509E-05 0.000825 0.280599 -75.5552307 0.887253 -5.6914 3136.9 13MB044_308 14.99807 4.0149 0.28056 2.677E-05 0.000872 0.280499 -78.7396475 0.946759 0.52163 3547.9 13MB054b_61 9.213667 3.5215 0.2828 3.204E-05 0.000617 0.282795 0.377010615 1.133026 1.33132 43.8 13MB054b_31 17.50241 3.6861 0.28262 2.73E-05 0.001249 0.282613 -5.92572069 0.965297 -1.533 205.3 13MB054b_75 13.22222 3.1753 0.28251 2.697E-05 0.001037 0.282505 -9.76846179 0.953823 -5.1868 212.8 13MB054b_187 12.94188 3.2854 0.28213 2.674E-05 0.000814 0.282131 -22.9856895 0.945768 -17.78 240.4 13MB054b_63 5.785999 2.8281 0.28245 3.052E-05 0.000359 0.282453 -11.6918932 1.079118 -6.3965 240.9 13MB054b_267 11.37609 3.361 0.28287 2.483E-05 0.000754 0.282862 2.849877886 0.877943 8.14241 243.3 13MB054b_92 16.73027 2.4107 0.28228 3.139E-05 0.001227 0.282273 -17.8944728 1.11017 -12.601 247.4 13MB054b_51 11.76479 3.4338 0.28176 3.059E-05 0.000735 0.281749 -36.3933257 1.081724 -25.529 499.7 13MB054b_166 19.12142 4.1137 0.282 2.772E-05 0.001192 0.28197 -27.8859841 0.980231 -2.8115 1159.6 13MB054b_195 9.359219 4.4837 0.28152 2.317E-05 0.000568 0.281495 -44.8811552 0.819184 -2.6287 1903.7 13MB054b_181 20.66861 3.8856 0.28164 2.66E-05 0.001045 0.281601 -40.5269225 0.940588 1.15084 1904.6 13MB054b_110 7.541951 3.2542 0.28135 2.478E-05 0.000491 0.281327 -50.7515496 0.876324 4.00301 2447.1 13MB054b_329 52.14574 2.7517 0.28088 5.269E-05 0.003305 0.280682 -67.2203535 1.863308 -1.6615 3181.9

187

APPENDIX IV Thin section petrology

188 Ganzi basins

Dataset QtFL Enter raw point count data below Output Data Top Left Right Top % Left % Right % 234 61 105 58.5 15.25 26.25 245 58 97 61.25 14.5 24.25 215 65 120 53.75 16.25 30 220 57 123 55 14.25 30.75 230 63 107 57.5 15.75 26.75 232 67 101 58 16.75 25.25 239 65 96 59.75 16.25 24 227 61 112 56.75 15.25 28 234 62 104 58.5 15.5 26

Dataset QmFLt Enter raw point count data below Output Data Top Left Right Top % Left % Right % 185 61 154 46.25 15.25 38.5 181 58 161 45.25 14.5 40.25 164 65 171 41 16.25 42.75 172 57 171 43 14.25 42.75 175 63 162 43.75 15.75 40.5 167 67 166 41.75 16.75 41.5 174 65 161 43.5 16.25 40.25 159 61 180 39.75 15.25 45 169 62 169 42.25 15.5 42.25

Dataset QmPK Enter raw point count data below Output Data Top Left Right Top % Left % Right % 185 30 31 75.20325 12.19512 12.60163 181 25 33 75.73222 10.46025 13.80753 164 28 37 71.61572 12.22707 16.15721 172 26 31 75.10917 11.35371 13.53712 175 30 33 73.52941 12.60504 13.86555 167 30 37 71.36752 12.82051 15.81197 174 22 43 72.80335 9.205021 17.99163 159 24 37 72.27273 10.90909 16.81818 169 23 39 73.16017 9.95671 16.88312

189 Dataset QpLvLs Enter raw point count data below Output Data Top Left Right Top % Left % Right % 63 21 70 40.90909 13.63636 45.45455 58 24 79 36.02484 14.90683 49.06832 65 29 77 38.0117 16.95906 45.02924 62 25 84 36.25731 14.61988 49.12281 61 22 79 37.65432 13.58025 48.76543 61 29 76 36.74699 17.46988 45.78313 60 21 80 37.26708 13.04348 49.68944 65 24 91 36.11111 13.33333 50.55556 58 19 92 34.31953 11.2426 54.43787

Mula basin

Dataset QtFL Enter raw point count data below Output Data Top Left Right Top % Left % Right % 234 61 105 58.5 15.25 26.25 205 81 114 51.25 20.25 28.5 184 92 124 46 23 31 187 102 111 46.75 25.5 27.75 164 131 105 41 32.75 26.25 181 107 112 45.25 26.75 28 211 78 111 52.75 19.5 27.75 193 82 125 48.25 20.5 31.25 201 127 72 50.25 31.75 18 159 124 117 39.75 31 29.25 184 87 129 46 21.75 32.25 192 114 94 48 28.5 23.5 209 101 90 52.25 25.25 22.5 227 126 47 56.75 31.5 11.75 198 95 107 49.5 23.75 26.75

190 Dataset QmFLt Enter raw point count data below Output Data Top Left Right Top % Left % Right % 204 61 135 51 15.25 33.75 185 81 134 46.25 20.25 33.5 164 92 144 41 23 36 171 102 117 43.84615 26.15385 30 151 131 118 37.75 32.75 29.5 174 107 119 43.5 26.75 29.75 201 78 121 50.25 19.5 30.25 178 82 140 44.5 20.5 35 191 127 82 47.75 31.75 20.5 147 124 129 36.75 31 32.25 179 87 134 44.75 21.75 33.5 178 114 108 44.5 28.5 27 195 101 104 48.75 25.25 26 188 126 86 47 31.5 21.5 194 95 111 48.5 23.75 27.75

Dataset QmPK Enter raw point count data below Output Data Top Left Right Top % Left % Right % 204 27 34 76.98113 10.18868 12.83019 185 35 46 69.54887 13.15789 17.29323 164 32 60 64.0625 12.5 23.4375 171 41 61 62.63736 15.01832 22.34432 151 49 82 53.5461 17.37589 29.07801 174 37 70 61.92171 13.16726 24.91103 201 29 49 72.04301 10.39427 17.56272 178 33 49 68.46154 12.69231 18.84615 191 41 86 60.06289 12.89308 27.04403 147 47 77 54.24354 17.34317 28.41328 183 34 53 67.77778 12.59259 19.62963 193 42 72 62.86645 13.68078 23.45277 195 40 61 65.87838 13.51351 20.60811 188 42 84 59.87261 13.3758 26.75159 194 29 66 67.12803 10.0346 22.83737

191 Dataset QpLvLs Enter raw point count data below Output Data Top Left Right Top % Left % Right % 30 13 29 41.66667 18.05556 40.27778 20 12 18 40 24 36 20 13 19 38.46154 25 36.53846 16 11 14 39.02439 26.82927 34.14634 13 4 8 52 16 32 7 2 7 43.75 12.5 43.75 10 3 9 45.45455 13.63636 40.90909 15 4 12 48.3871 12.90323 38.70968 10 3 7 50 15 35 12 5 9 46.15385 19.23077 34.61538 5 2 7 35.71429 14.28571 50 14 3 9 53.84615 11.53846 34.61538 14 4 7 56 16 28 39 12 23 52.7027 16.21622 31.08108 4 1 6 36.36364 9.090909 54.54545

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