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Geochemistry This
TORONTOTORONTO Vol. 8, No. 4 April 1998 Call for Papers GSA TODAY — page C1 A Publication of the Geological Society of America Electronic Abstracts Submission — page C3 Antarctic Neogene Landscapes—In the 1998 Registration Refrigerator or in the Deep Freeze? Annual Issue Meeting — June GSA Today Introduction The present Molly F. Miller, Department of Geology, Box 117-B, Vanderbilt Antarctic landscape undergoes very University, Nashville, TN 37235, [email protected] slow environmental change because it is almost entirely covered by a thick, slow-moving ice sheet and thus effectively locked in a Mark C. G. Mabin, Department of Tropical Environmental Studies deep freeze. The ice sheet–landscape system is essentially stable, and Geography, James Cook University, Townsville, Queensland 4811, Australia, [email protected] Antarctic—Introduction continued on p. 2 Atmospheric Transport of Diatoms in the Antarctic Sirius Group: Pliocene Deep Freeze Arjen P. Stroeven, Department of Quaternary Research, Stockholm University, S-106 91 Stockholm, Sweden Lloyd H. Burckle, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964 Johan Kleman, Department of Physical Geography, Stockholm University, S-106, 91 Stockholm, Sweden Michael L. Prentice, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824 INTRODUCTION How did young diatoms (including some with ranges from the Pliocene to the Pleistocene) get into the Sirius Group on the slopes of the Transantarctic Mountains? Dynamicists argue for emplacement by a wet-based ice sheet that advanced across East Antarctica and the Transantarctic Mountains after flooding of interior basins by relatively warm marine waters [2 to 5 °C according to Webb and Harwood (1991)]. -
Provided for Non-Commercial Research and Educational Use. Not for Reproduction, Distribution Or Commercial Use
Provided for non-commercial research and educational use. Not for reproduction, distribution or commercial use. This article was originally published in the Treatise on Geophysics, published by Elsevier and the attached copy is provided by Elsevier for the author’s benefit and for the benefit of the author’s institution, for non-commercial research and educational use including use in instruction at your institution, posting on a secure network (not accessible to the public) within your institution, and providing a copy to your institution’s administrator. All other uses, reproduction and distribution, including without limitation commercial reprints, selling or licensing copies or access, or posting on open internet sites are prohibited. For exceptions, permission may be sought for such use through Elsevier’s permissions site at: http://www.elsevier.com/locate/permissionusematerial Information taken from the copyright line. The Editor-in-Chief is listed as Gerald Schubert and the imprint is Academic Press. Author's personal copy 7.09 Hot Spots and Melting Anomalies G. Ito, University of Hawaii, Honolulu, HI, USA P. E. van Keken, University of Michigan, Ann Arbor, MI, USA ª 2007 Elsevier B.V. All rights reserved. 7.09.1 Introduction 372 7.09.2 Characteristics 373 7.09.2.1 Volcano Chains and Age Progression 373 7.09.2.1.1 Long-lived age-progressive volcanism 373 7.09.2.1.2 Short-lived age-progressive volcanism 381 7.09.2.1.3 No age-progressive volcanism 382 7.09.2.1.4 Continental hot spots 383 7.09.2.1.5 The hot-spot reference frame 386 -
And the Digital Data Files Contained on It (The “Content”), Is Governed by the Terms Set out on This Page (“Terms of Use”)
ISBN 978-1-4249-9924-8 [DVD] ISBN 978-1-4249-9925-5[ZIP FILE] THESE TERMS GOVERN YOUR USE OF THIS PRODUCT Your use of this electronic information product (“EIP”), and the digital data files contained on it (the “Content”), is governed by the terms set out on this page (“Terms of Use”). By opening the EIP and viewing the Content , you (the “User”) have accepted, and have agreed to be bound by, the Terms of Use. EIP and Content: This EIP and Content is offered by the Province of Ontario’s Ministry of Northern Development and Mines (MNDM) as a public service, on an “as-is” basis. Recommendations and statements of opinions expressed are those of the author or authors and are not to be construed as statement of government policy. You are solely responsible for your use of the EIP and its Content. You should not rely on the Content for legal advice nor as authoritative in your particular circumstances. Users should verify the accuracy and applicability of any Content before acting on it. MNDM does not guarantee, or make any warranty express or implied, that the Content is current, accurate, complete or reliable or that the EIP is free from viruses or other harmful components. MNDM is not responsible for any damage however caused, which results, directly or indirectly, from your use of the EIP or the Content. MNDM assumes no legal liability or responsibility for the EIP or the Content whatsoever. Links to Other Web Sites: This EIP or the Content may contain links, to Web sites that are not operated by MNDM. -
Synoptic Taxonomy of Major Fossil Groups
APPENDIX Synoptic Taxonomy of Major Fossil Groups Important fossil taxa are listed down to the lowest practical taxonomic level; in most cases, this will be the ordinal or subordinallevel. Abbreviated stratigraphic units in parentheses (e.g., UCamb-Ree) indicate maximum range known for the group; units followed by question marks are isolated occurrences followed generally by an interval with no known representatives. Taxa with ranges to "Ree" are extant. Data are extracted principally from Harland et al. (1967), Moore et al. (1956 et seq.), Sepkoski (1982), Romer (1966), Colbert (1980), Moy-Thomas and Miles (1971), Taylor (1981), and Brasier (1980). KINGDOM MONERA Class Ciliata (cont.) Order Spirotrichia (Tintinnida) (UOrd-Rec) DIVISION CYANOPHYTA ?Class [mertae sedis Order Chitinozoa (Proterozoic?, LOrd-UDev) Class Cyanophyceae Class Actinopoda Order Chroococcales (Archean-Rec) Subclass Radiolaria Order Nostocales (Archean-Ree) Order Polycystina Order Spongiostromales (Archean-Ree) Suborder Spumellaria (MCamb-Rec) Order Stigonematales (LDev-Rec) Suborder Nasselaria (Dev-Ree) Three minor orders KINGDOM ANIMALIA KINGDOM PROTISTA PHYLUM PORIFERA PHYLUM PROTOZOA Class Hexactinellida Order Amphidiscophora (Miss-Ree) Class Rhizopodea Order Hexactinosida (MTrias-Rec) Order Foraminiferida* Order Lyssacinosida (LCamb-Rec) Suborder Allogromiina (UCamb-Ree) Order Lychniscosida (UTrias-Rec) Suborder Textulariina (LCamb-Ree) Class Demospongia Suborder Fusulinina (Ord-Perm) Order Monaxonida (MCamb-Ree) Suborder Miliolina (Sil-Ree) Order Lithistida -
Giant Radiating Mafic Dyke Swarm of the Emeishan Large Igneous Province: Identifying the Mantle Plume Centre
doi: 10.1111/ter.12154 Giant radiating mafic dyke swarm of the Emeishan Large Igneous Province: Identifying the mantle plume centre Hongbo Li,1,2 Zhaochong Zhang,1 Richard Ernst,3,4 Linsu L€u,2 M. Santosh,1 Dongyang Zhang1 and Zhiguo Cheng1 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China; 2Geologi- cal Museum of China, Beijing 100034, China; 3Department of Earth Sciences, Carleton University, Ottawa, ON K1S 5B6, Canada; 4Ernst Geosciences, 43 Margrave Avenue, Ottawa, ON K1T 3Y2, Canada ABSTRACT In many continental large igneous provinces, giant radiating and recognized six dyke sub-swarms, forming an overall dyke swarms are typically interpreted to result from the arri- radiating dyke swarm and converging in the Yongren area, val of a mantle plume at the base of the lithosphere. Mafic Yunnan province. This location coincides with the maximum dyke swarms in the Emeishan large igneous province (ELIP) pre-eruptive domal uplift, and is close to the locations of have not received much attention prior to this study. We high-temperature picrites. Our study suggests that the Yon- show that the geochemical characteristics and geochronologi- gren area may represent the mantle plume centre during the cal data of the mafic dykes are broadly similar to those of peak of Emeishan magmatism. the spatially associated lavas, suggesting they were derived from a common parental magma. Based on the regional geo- Terra Nova, 27, 247–257, 2015 logical data and our field observations, we mapped the spa- tial distribution patterns of mafic dyke swarms in the ELIP, ridge by a continent (Gower and swarms and their distributions pro- Introduction Krogh, 2002), edge-driven enhanced vide an opportunity to further test Large igneous provinces (LIPs) are mantle convection (King and Ander- the plume model for the ELIP. -
Instability of the Southern Canadian Shield During the Late Proterozoic 2 3 Kalin T
1 Instability of the southern Canadian Shield during the late Proterozoic 2 3 Kalin T. McDannella,b*, Peter K. Zeitlera, and David A. Schneiderc 4 5 aDepartment of Earth and Environmental Sciences, Lehigh University, 1 W. Packer Ave. Bethlehem PA, 18015 USA 6 7 bGeological Survey of Canada, Natural Resources Canada, 3303 – 33 St NW Calgary AB, T2L 2A7 Canada 8 9 cDepartment of Earth & Environmental Sciences, University of Ottawa, 25 Templeton Ave., Ottawa ON, K1N 6N5 10 Canada 11 12 *corresponding author: [email protected]; [email protected] 13 14 ABSTRACT 15 Cratons are generally considered to comprise lithosphere that has remained tectonically 16 quiescent for billions of years. Direct evidence for stability is mainly founded in the Phanerozoic 17 sedimentary record and low-temperature thermochronology, but for extensive parts of Canada, 18 earlier stability has been inferred due to the lack of an extensive rock record in both time and 19 space. We used 40Ar/39Ar multi-diffusion domain (MDD) analysis of K-feldspar to constrain 20 cratonic thermal histories across an intermediate (~150-350°C) temperature range in an attempt 21 to link published high-temperature geochronology that resolves the timing of orogenesis and 22 metamorphism with lower-temperature data suited for upper-crustal burial and unroofing 23 histories. This work is focused on understanding the transition from Archean-Paleoproterozoic 24 crustal growth to later intervals of stability, and how uninterrupted that record is throughout 25 Earth’s Proterozoic “Middle Age.” Intermediate-temperature thermal histories of cratonic rocks 26 at well-constrained localities within the southern Canadian Shield of North America challenge 27 the stability worldview because our data indicate that these rocks were at elevated temperatures 28 in the Proterozoic. -
4 Biennial Structural Geology & Tectonics Forum 2016
Program, Abstract and Information Book 4th Biennial Structural Geology & Tectonics Forum 2016 Sonoma State University Rohnert Park, CA August 1st – 3rd Forum Staff and Organizational Committee Forum Organizers: Matty Mookerjee (Sonoma State University) Steering Committee: Yvette Kuiper (Colorado School of Mines) and Paul Karabinos (Williams College) Technical Session Organizers: Katherine Boggs (Mount Royal University) and Steve Wojtal (Oberlin College) Field Trip Organizers: Christie Rowe (McGill University) and Sarah Roeske (UC Davis) Short Course Organizers: Kurt Burmeister (U. of the Pacific) and Saad Haq (Purdue University) Web Site : Barbara Tewksbury (Hamilton College) Logistics: Elisabeth (Liz) Ketterman and Dena Peacock (Sonoma State University) Registration: Conferences and Events Services (Sonoma State University) Finance Committee: Emily Peterman (Bowdoin College) and Hal Bosbyshell (West Chester University) TABLE OF CONTENTS GENERAL INFORMATION ....................................................................................ii CAMPUS MAPS…………………………………………………………………………………………..……vi FORUM PROGRAM ...............................................................................................1 Saturday, July 30th ....................................................................................1 Sunday, July 31st ......................................................................................3 Monday, August 1st ..................................................................................5 Tuesday, August 2nd .................................................................................7 -
7.09 Hot Spots and Melting Anomalies G
7.09 Hot Spots and Melting Anomalies G. Ito, University of Hawaii, Honolulu, HI, USA P. E. van Keken, University of Michigan, Ann Arbor, MI, USA ª 2007 Elsevier B.V. All rights reserved. 7.09.1 Introduction 372 7.09.2 Characteristics 373 7.09.2.1 Volcano Chains and Age Progression 373 7.09.2.1.1 Long-lived age-progressive volcanism 373 7.09.2.1.2 Short-lived age-progressive volcanism 381 7.09.2.1.3 No age-progressive volcanism 382 7.09.2.1.4 Continental hot spots 383 7.09.2.1.5 The hot-spot reference frame 386 7.09.2.2 Topographic Swells 387 7.09.2.3 Flood Basalt Volcanism 388 7.09.2.3.1 Continental LIPs 388 7.09.2.3.2 LIPs near or on continental margins 389 7.09.2.3.3 Oceanic LIPs 391 7.09.2.3.4 Connections to hot spots 392 7.09.2.4 Geochemical Heterogeneity and Distinctions from MORB 393 7.09.2.5 Mantle Seismic Anomalies 393 7.09.2.5.1 Global seismic studies 393 7.09.2.5.2 Local seismic studies of major hot spots 395 7.09.2.6 Summary of Observations 399 7.09.3 Dynamical Mechanisms 400 7.09.3.1 Methods 400 7.09.3.2 Generating the Melt 401 7.09.3.2.1 Temperature 402 7.09.3.2.2 Composition 402 7.09.3.2.3 Mantle flow 404 7.09.3.3 Swells 405 7.09.3.3.1 Generating swells: Lubrication theory 405 7.09.3.3.2 Generating swells: Thermal upwellings and intraplate hot spots 407 7.09.3.3.3 Generating swells: Thermal upwellings and hot-spot–ridge interaction 408 7.09.3.4 Dynamics of Buoyant Upwellings 410 7.09.3.4.1 TBL instabilities 410 7.09.3.4.2 Thermochemical instabilities 411 7.09.3.4.3 Effects of variable mantle properties 412 7.09.3.4.4 Plume -
EPSC 233: Earth and Life History
EPSC 233: Earth and Life History Galen Halverson Fall Semester, 2014 Contents 1 Introduction to Geology and the Earth System 1 1.1 The Science of Historical Geology . 1 1.2 The Earth System . 4 2 Minerals and Rocks: The Building Blocks of Earth 6 2.1 Introduction . 6 2.2 Structure of the Earth . 6 2.3 Elements and Isotopes . 7 2.4 Minerals . 9 2.5 Rocks . 10 3 Plate Tectonics 16 3.1 Introduction . 16 3.2 Continental Drift . 16 3.3 The Plate Tectonic Revolution . 17 3.4 An overview of plate tectonics . 20 3.5 Vertical Motions in the Mantle . 24 4 Geological Time and the Age of the Earth 25 4.1 Introduction . 25 4.2 Relative Ages . 25 4.3 Absolute Ages . 26 4.4 Radioactive dating . 28 4.5 Other Chronostratigraphic Techniques . 31 5 The Stratigraphic Record and Sedimentary Environments 35 5.1 Introduction . 35 5.2 Stratigraphy . 35 5.3 Describing and interpreting detrital sedimentary rocks . 36 6 Life, Fossils, and Evolution 41 6.1 Introduction . 41 6.2 Fossils . 42 6.3 Biostratigraphy . 44 6.4 The Geological Time Scale . 45 6.5 Systematics and Taxonomy . 46 6.6 Evolution . 49 6.7 Gradualism Versus Punctuated Equilibrium . 53 i ii 7 The Environment and Chemical Cycles 55 7.1 Introduction . 55 7.2 Ecology . 56 7.3 The Atmosphere . 57 7.4 The Terrestrial Realm . 61 7.5 The Marine Realm . 63 8 Origin of the Earth and the Hadean 66 8.1 Introduction . 66 8.2 Origin of the Solar System . -
Flow Fabric Determination of Two Mesoproterozoic Midcontinent Rift Dike Swarms, Northeastern Minnesota
FLOW FABRIC DETERMINATION OF TWO MESOPROTEROZOIC MIDCONTINENT RIFT DIKE SWARMS, NORTHEASTERN MINNESOTA A thesis submitted to the Kent State University Graduate College in partial fulfillment of the requirements for the degree of Master of Science by Elizabeth May Fein May, 2009 Thesis written by Elizabeth May Fein B.A., Oberlin College, 2003 M.S., Kent State University, 2009 Approved by ___________________________________, Advisor Daniel Holm ___________________________________, Chair, Department of Geology Daniel Holm ___________________________________, Dean, College of Arts and Sciences Timothy Moerland ii DEPARTMENT OF GEOLOGY THESIS APPROVAL FORM This thesis, entitled Flow fabric determination of two Mesoproterozoic midcontinent rift dike swarms, northeastern Minnesota has been submitted by Elizabeth Fein in partial fulfillment of the requirements for the Master of Science in Geology. The undersigned member’s of the student’s thesis committee have read this thesis and indicated their approval or disapproval of the same. Approval Date Disapproval Date _______________________________ _______________________________ Daniel Holm Daniel Holm _______________________________ _______________________________ Donald Palmer Donald Palmer _______________________________ _______________________________ David Schneider David Schneider iii Table of Contents List of Figures…………………………………………………………………………....v List of Tables…………………………………………………………………………….vi Acknowledgements…………………………………………………………………….vii Abstract ………………………………………………………………………………….1 1. Introduction -
Subduction to Strike-Slip Transitions on Plate Boundaries
Penrose Conference SUBDUCTION TO STRIKE-SLIP TRANSITIONS ON PLATE BOUNDARIES Puerto Plata, Dominican Republic January 18-24, 1999 ABSTRACT VOLUME Conveners: Paul Mann, Nancy Grindlay and James Dolan Sponsored by the Geological Society of America, Petroleum Research Fund, NSF and NASA Penrose Conference: Subduction to Strike-Slip Transitions on Plate Boundaries, Jan. 18-24, 1999 STRUCTURAL GEOLOGY AND SEDIMENTOLOGY OF A PLIOCENE INNER-TRENCH SLOPE SUCCESSION, NORTHWESTERN ECUADOR K. R. AALTO Dept. of Geology, Humboldt State Univ., Arcata, CA, USA 95521, [email protected] The Pliocene Upper Onzole Formation exposed in the vicinity of Punta Gorda, near Esmeraldas, Ecuador, is composed mainly of fine-grained mud turbidites, having regular vertical sequences of sedimentary structures associated with a positive grading, and bioturbation restricted mostly to the tops of beds. The remainder of beds measured consist of volcanic ash, mud pelagite, and glauconitic silt-sand turbidites. Vertical sequential analysis of stratigraphic sections for the most part show no pronounced trends in bed thickness or grain size. Volcanic ashes are crystal-vitric tuffs occurring in four bedding styles: A) normally- graded ashes with burrowed gradational tops and sharp wavy bases; B) ashes that form part of a complex microstratigraphy consisting of thinly-bedded mudstone, silt-sand turbidites, tuffaceous mudstone, and ash beds; C) less conspicuous ash laminae and ash-filled burrows; and D) a tuffaceous bed with ash and mud swirled together in convolute layers. Ash chemistry suggests an Andean high-K calc-alkaline provenance. Facies relations, paleontologic data and regional geologic setting suggest sediment accumulation on an inner trench slope in a basin situated oceanward of the Pliocene trench-slope break. -
Stratiform Chromite Deposit Model
Stratiform Chromite Deposit Model Chapter E of Mineral Deposit Models for Resource Assessment Scientific Investigations Report 2010–5070–E U.S. Department of the Interior U.S. Geological Survey COVER: Photograph showing outcropping of the Bushveld LG6 chromitite seam. Photograph courtesy of Klaus J. Schulz, U.S. Geological Survey. Stratiform Chromite Deposit Model By Ruth F. Schulte, Ryan D. Taylor, Nadine M. Piatak, and Robert R. Seal II Chapter E of Mineral Deposit Model for Resource Assessment Scientific Investigations Report 2010–5070–E U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Marcia K. McNutt, Director U.S. Geological Survey, Reston, Virginia: 2012 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1–888–ASK–USGS. For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: Schulte, R.F., Taylor, R.D., Piatak, N.M., and Seal, R.R., II, 2012, Stratiform chromite deposit model, chap. E of Mineral deposit models for resource assessment: U.S.