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The San Bias Pluton: an Example of Carboniferous Plutonism in the Sierras Pampeanas, Argentina
The San BIas Pluton: An example of Carboniferous plutonism in the Sierras Pampeanas, Argentina l.A. Dahlquist a.*, R.l. Pankhurst b, c.w. Rapela e, C. Casquet d, C.M. Fanning e, P. Alasino f, M. Baez g a UNdeC-CRlLAR-CONICET, Entre Ríos y Mendoza, 5301 Anillaco, La Rioja, Argentina b NERC lsotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK e Centro de Investigaciones Geológicas, Universidad Nacional de La Plata-CONICET, Calle / No. 644, /900 La Plata, Argentina d Universidad Complutense de Madrid, Facultad de Geología, Dpto. de Petrología y Geoquímica, 28040 Madrid, España e Research School of Earth Sciences, The Australian National University, Mills Road, Canberra, ACT 0200, Australia f CRlLAR-CONICET, Entre Ríos y Mendoza, 5301 Anillaco, La Rioja, Argentina g INSUGEO-UNT, Miguel Litio 205, 4000 S.M. de Tucumán, Argentina Abstraet New geoehronologieal and geoehemieal data are reported for the San BIas Pluton (SBP), in the northwestern Sierra de Velaseo, Sierras Pampeanas, whieh intrudes Ordovieian granitoids developed during the Famatinian orogeny. A precise Carboniferous age of 340 ± 3 Ma is established by U-Pb dating of zireon using a sensitive high-resolution ion mieroprobe (SHRIMP). The SBP illustrates several petrologieal and geoehemieal eharaeteristies of previously reported Carboniferous granitoids in the Sierras Pampeanas. Their generation is eonsistent with a regional reheating of the erust at approximately 342 Ma, whieh resulted in the forn1ation of relatively large amounts of granitie melts that were emplaeed in higher erustallevels along master fractures (older master shear zones ofLower Paleozoie age). The SBP can be ehemieally defined as a typieal A-type granitoid related to posteollisonal or postorogenie magmatism. -
Radiogenic Heat Production in Granitoids from the Sierras De Córdoba, Argentina
Pleitavino et al. Geotherm Energy (2021) 9:16 https://doi.org/10.1186/s40517-021-00198-9 RESEARCH Open Access Radiogenic heat production in granitoids from the Sierras de Córdoba, Argentina M. Pleitavino1,2* , M. E. Carro Pérez1,3,4 , E. García Aráoz1,4 and M. A. Cioccale1 *Correspondence: [email protected] Abstract 1 Facultad de Ciencias One of the most important processes of heat generation from the Earth’s interior is Exactas, Físicas y Naturales, Universidad Nacional de the radioactive decay of isotopes. The main hosts of the major radiogenic elements Córdoba, Av. Vélez Sarsfeld U, Th and K in the crust are granitoids. The Sierras de Córdoba are formed of dissimilar 1611, X5016CGA Córdoba, granitic intrusions emplaced by a series of magmatic events that occurred during Argentina Full list of author information the Paleozoic. The diferent granitoids are classifed as A-type, I-type, and S-type, and is available at the end of the there is also a magmatic expression corresponding to the Famatinian period which article exhibits TTG-type characteristics. In this work, the geochemical concentrations of the radiogenic elements of the granitic intrusions making up the Sierras de Córdoba were compiled in a single database. The radiogenic heat production of the Sierras de Córdoba granitoids was evaluated, making this the frst study of radiogenic heat gen- eration in the area. The radiogenic heat production showed variability for the diferent events, with the highest values found in Achalian magmatism and early Carboniferous magmatism, which are represented by A-type granitoids. The Capilla del Monte pluton has the highest heat production rate, with a value of 4.54 1.38 µW/m3. -
Paleoproterozoic Mafic and Ultramafic Volcanic Rocks in the South Savo Region, Eastern Finland
Development of the Paleoproterozoic Svecofennian orogeny: new constraints from the southeastern boundary of the Central Finland Granitoid Complex Edited by Perttu Mikkola, Pentti Hölttä and Asko Käpyaho Geological Survey of Finland, Bulletin 407, 63-84, 2018 PALEOPROTEROZOIC MAFIC AND ULTRAMAFIC VOLCANIC ROCKS IN THE SOUTH SAVO REGION, EASTERN FINLAND by Jukka Kousa, Perttu Mikkola and Hannu Makkonen Kousa, J., Mikkola, P. & Makkonen, H. 2018. Paleoproterozoic mafic and ultramafic volcanic rocks in the South Savo region, eastern Finland. Geological Survey of Finland, Bulletin 407, 63–84, 11 figures and 1 table. Ultramafic and mafic volcanic rocks are present as sporadic interlayers in the Paleo- proterozoic Svecofennian paragneiss units in the South Savo region of eastern Finland. These elongated volcanic bodies display locally well-preserved primary structures, have a maximum thickness of ca. 500 m and a maximum length of several kilometres. Geo- chemically, the ultramafic variants are picrites, whereas the mafic members display EMORB-like chemical compositions. The picrites, in particular, display significant com- positional variation in both major and trace elements (light rare earth and large-ion lithophile elements). These differences may have been caused by differences in their magma source, variable degrees of crustal contamination and post-magmatic altera- tion, as well as crystal accumulation and fractionation processes. The volcanic units are interpreted to represent extensional phase(s) in the development of the sedimentary basin(s) where the protoliths of the paragneisses were deposited. The eruption age of the volcanic units is interpreted to be 1.91–1.90 Ga. Appendix 1 is available at: http://tupa.gtk.fi/julkaisu/liiteaineisto/bt_407_appendix_1. -
New Studies of Uranium Deposits Related to Granites in Argentina
NEW STUDIES OF URANIUM DEPOSITS RELATED TO GRANITES IN ARGENTINA J. ÁLVAREZ, L. LÓPEZ, F. PARRA, C. BELLO, P. ANZIL, M. SALVATORE, L. SCARLATTA, P. FERREYRA, S. MIYNO, E. FELKAI Comisión Nacional de Energía Atómica (CNEA), Buenos Aires, Argentina R. LIRA CONICET- FCEFyN-UNC, Córdoba, Argentina A. HANLY International Atomic Energy Agency, Vienna, Austria M. CUNEY, J. MERCADIER Université de Lorraine, Nancy, France 1. INTRODUCTION At present, the Comisión Nacional de Energía Atómica, in cooperation with the National University of Córdoba, is carrying out the project entitled Melallogenesis of Granite-Related Uranium Deposits in Argentina within the framework of an IAEA coordinated research project which is Geochemical and Mineralogical Characterization of Uranium and Thorium Deposits. This paper briefly describes the specific objectives and activities in progress as part of this research project, which has been underway since 2015 [1]. This project aims to focus on the characterization of the Devonian–Lower Carboniferous magmatic and hydrothermal systems related to granitoids of the Pampean Ranges and to relate these processes to uranium metallogeny. Therefore, several metallogenetic studies have been carried out in order to improve the geological, structural, geochemical and mineralogical characterization of uranium deposits related to granites. To this end, efforts have been made to define those felsic igneous rocks that have played the most relevant role as uranium sources, including successive fractionation in the different magmatic complexes and characterize the relationship between magmatic uranium enrichment and hydrothermal deposits, and alteration and uranium mobility. 2. DESCRIPTION AND RESULTS The scientific scope of this paper specifically covers four areas of uranium mineralization where granite- related (endogranitic) hosts have been described: Sala Grande, Don Alberto and Los Riojanos are enclosed in the Achala Batholith, and La Estela is located in the Cerro Áspero–Alpa Corral Batholith [2, 3]. -
University of Nevada Reno Metamorphic Geology of a Portion
University of Nevada Reno Metamorphic Geology of a Portion of the Bagdad Mining District Yavapai County, Arizona A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science by Daniel E. Collins III May 1977 WiNEs U3RARY m © 1 9 7 8 DANIEL EDWARD COLLINS ALL RIGHTS RESERVED The thesis of Daniel E. Collins is approved: Thesis advisor University of Nevada Reno May .1977 PLEASE NOTE: This dissertation contains color photographs which will not reproduce well. UNIVERSITY MICROFILMS INTERNATIONAL. 1 ACKNOWLEDGEMENT The author is sincerely indebted to the Cyprus Mines Corporation for its interest and generous financial support without which this thesis would not have been possible. I wish to thank in particular Bob Clayton and Joe Sierakowsky for their advice and help while in the field. The guidance of Malcolm Hibbard and Don Noble at the University of Nevada was very much appreciated. I also wish to thank Arthur Baker III who first suggested the thesis area and provided many useful suggestions during the writing. The Nevada Bureau of Mines and Jack Quade of NASA are thanked for access and instruction in the use of the x- ray analysis equipment. I am deeply grateful to John and Constantine Zanarras and to my wife, Merilyn, for their constant companionship. I ABSTRACT An estimated 2,150 meters of eugeosynclinal porphyritic andesites, basalts and volcanic sediments belonging to the Bridle formation were metamorphosed during the Mazatzal Revolution (?) to produce greenschist facies minerology, regional folding, and penetrative fabric elements. Prior to regional metamorphism, the Bridle formation was shallowly intruded by concordant masses of porphyritic trondjhemite and a differentiated Dick Rhyolite. -
Ecological Zones in the Southern Appalachians: First Approximation
United States Department of Ecological Zones in the Southern Agriculture Forest Service Appalachians: First Approximation Steve A. Simon, Thomas K. Collins, Southern Gary L. Kauffman, W. Henry McNab, and Research Station Christopher J. Ulrey Research Paper SRS–41 The Authors Steven A. Simon, Ecologist, USDA Forest Service, National Forests in North Carolina, Asheville, NC 28802; Thomas K. Collins, Geologist, USDA Forest Service, George Washington and Jefferson National Forests, Roanoke, VA 24019; Gary L. Kauffman, Botanist, USDA Forest Service, National Forests in North Carolina, Asheville, NC 28802; W. Henry McNab, Research Forester, USDA Forest Service, Southern Research Station, Asheville, NC 28806; and Christopher J. Ulrey, Vegetation Specialist, U.S. Department of the Interior, National Park Service, Blue Ridge Parkway, Asheville, NC 28805. Cover Photos Ecological zones, regions of similar physical conditions and biological potential, are numerous and varied in the Southern Appalachian Mountains and are often typified by plant associations like the red spruce, Fraser fir, and northern hardwoods association found on the slopes of Mt. Mitchell (upper photo) and characteristic of high-elevation ecosystems in the region. Sites within ecological zones may be characterized by geologic formation, landform, aspect, and other physical variables that combine to form environments of varying temperature, moisture, and fertility, which are suitable to support characteristic species and forests, such as this Blue Ridge Parkway forest dominated by chestnut oak and pitch pine with an evergreen understory of mountain laurel (lower photo). DISCLAIMER The use of trade or firm names in this publication is for reader information and does not imply endorsement of any product or service by the U.S. -
Record Number
Supplementary material: Geochronological data used in the study NN Pegmatite field or belt Geochronology Used for dating Extrapola Most common References: 1,2 names/geological and (Ma) substances and tion classes of geochronology / pegmatite and regional geology descriptions administrative location source rocks3 number4 mineralized pegmatites in a region of the extrapolation5 1. Mpuluzi / Barberton GB6, 3113 ± 2.4 z, g(+) 2 RM Westraat et al., 2005; Kamo & Davis, 1994 / Maphalala & Kaapvaal craton, RSA & Trumbull, 1998 Swaziland 3105 ± 3 z+tt, g(+) 2. New Consort (Nelspruit) / 3106 +4/-3 z+tt, g (+) 1 RM Kamo & Davis, 1994 / Harris et al., 1995 Barberton GB, Kaapvaal craton, RSA 3. Sinceni / Ancient Gneiss 3074 ± 3 z, g (+); 2 RM Maphalala & Kröner, 1993; Trumbull, 1993 / Trumbull, 1995 Complex, Kaapvaal craton, 2990 ± 43 wr (Rb/Sr), g (+) Swaziland 4. Ivisaartoq / Ivisaartoq GB, 2963 ± 12 z, g (-) 2 RM Friend and Nutman, 2005/ Secher et al., 2008 Geenland craton, Greenland 5. Tabba Tabba, Pilgangoora, 2886 ± 21; c, p 6 RM Kinny, 2000 / Sweetapple & Collins, 2002 Hillside / Pilbara craton, 2879 ± 5; tn, p Australia 2877 ± 20 c, p 6. Wodgina, Strelley, Molyella / 2829 ± 11 tn, p 12 RM Kinny, 2000 / Sweetapple & Collins, 2002 Pilbara craton, Australia 2836 ± 26 c, p 2839 ± 16 c, p 7. Murchison / Murchison GB, 2848±58 z, p 2 RM Poujol & Robb, 1999; Poujol, M., 2001 / Boelema & Hira, 1998 Kaapvaal craton, RSA 2820±38 z, g (+) 8. Pakeagama Lake / North Spirit 2670±5 tn, p 2 RM Smith et al., 2004 / Breaks et al., 1999 1 Minerals used for geochronological -
Preliminary Bedrock Geologic Map of the Wightman 7.5' Quadrangle, Virginia
U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY Preliminary Bedrock Geologic Map of the Wightman 7.5' Quadrangle, Virginia by William C. Burtoni Open-File Report 93-614 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards (or with the North American Stratigraphic Code). Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 1 U.S. Geological Survey, Reston, VA 22092 TABLE OF CONTENTS Introduction................................................................................. 1 Lithology.......................................................................................2 Structure and Metamorphism............................................... 2 References Cited....................................................................... 2 Description of Map Units........................................................ 5 Explanation of Map Symbols.................................................. 7 LIST OF FIGURES Figure 1. Location of map.......................................................4 Figure 2. Evidence for compression...................................4 INTRODUCTION The Wightman 7.5* quadrangle has been mapped as part of the Geology of the South-Central Virginia Piedmont Project, where geologic mapping of adjacent areas is in progress (Norton and others, 1993). It is located in the east-central part of the South Boston 30'x60' quadrangle. The Wightman quadrangle is within the Carolina slate belt (Figure 1) and has not been previously mapped in detail. The Carolina slate belt in this area consists of volcanic and sedimentary rocks and associated intrusive igneous rocks that have been subjected to lower greenschist-facies metamorphism. The rocks are poorly dated but of probable Late Proterozoic and Early Cambrian age (Butler and Secor, 1991). The Carolina slate belt may represent a subduction-related volcanic arc (Butler and Secor, 1991), or rifted-arc complex (Feiss and others, 1993). -
Geologic Map of the Wickenburg, Southern Buckhorn, and Northwestern Hieroglyphic Mountains, Central Arizona
Geologic Map of the Wickenburg, southern Buckhorn, and northwestern Hieroglyphic Mountains, central Arizona _ by James A. Stimac, Joan E. Fryxell. Stephen J. Reynolds, Stephen M. Richard, Michael J. GrubenskY, and Elizabeth A. Scott Arizona Geological Survey Open-File Report 87-9 October, 1987 Arizona Geological Survey 416 W. Congress, Suite #100, Tucson, Arizona 85701 This report is preliminalY and has not been edited or reviewed for conformity with Arizona Geological Survey standards INTRODUCTION This report describes the geology of the Red Picacho quadrangle and parts of the Wickenburg, Garfias Mountain, and Wittmann quadrangles (Fig. 1). Geologic mapping was completed between January and April of 1987, and was jointly funded by the U.S. Geological Survey and the Arizona Bureau of Geology and Mineral Technology as part of the cost-sharing COGEOMAP program. Mapping was done on 1:24,000-scale topographic maps and on 1:24,000-scale color aerial photographs provided by Raymond A. Brady of the U.S. Bureau of Land Management. GEOLOGIC OVERVIEW The map area includes the Wickenburg Mountains and contiguous parts of the Buckhorn and Hieroglyphic Mountains (Fig. 1). Adjacent parts of the Vulture Mountains were mapped by Grubensky and oth_ers (1987) and adjacent parts of the Hieroglyphic Mountains were mapped by Capps and others (1986). The overall geologic history of the area is complex, but the regional stratigraphy developed in these reports carries well from range to range. The map area is composed of a metamorphic-plutonic basement unconformably overlain by Tertiary volcanic and sedimentary rocks. The oldest rocks, assigned to the Proterozoic (1.8-1.7 b.y.) Yavapai Supergroup, consist of amphibolite, schist, and gneiss, intruded by granite, leucogranite, and pegmatite. -
Geologic Map of Washington - Northwest Quadrant
GEOLOGIC MAP OF WASHINGTON - NORTHWEST QUADRANT by JOE D. DRAGOVICH, ROBERT L. LOGAN, HENRY W. SCHASSE, TIMOTHY J. WALSH, WILLIAM S. LINGLEY, JR., DAVID K . NORMAN, WENDY J. GERSTEL, THOMAS J. LAPEN, J. ERIC SCHUSTER, AND KAREN D. MEYERS WASHINGTON DIVISION Of GEOLOGY AND EARTH RESOURCES GEOLOGIC MAP GM-50 2002 •• WASHINGTON STATE DEPARTMENTOF 4 r Natural Resources Doug Sutherland· Commissioner of Pubhc Lands Division ol Geology and Earth Resources Ron Telssera, Slate Geologist WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES Ron Teissere, State Geologist David K. Norman, Assistant State Geologist GEOLOGIC MAP OF WASHINGTON NORTHWEST QUADRANT by Joe D. Dragovich, Robert L. Logan, Henry W. Schasse, Timothy J. Walsh, William S. Lingley, Jr., David K. Norman, Wendy J. Gerstel, Thomas J. Lapen, J. Eric Schuster, and Karen D. Meyers This publication is dedicated to Rowland W. Tabor, U.S. Geological Survey, retired, in recognition and appreciation of his fundamental contributions to geologic mapping and geologic understanding in the Cascade Range and Olympic Mountains. WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES GEOLOGIC MAP GM-50 2002 Envelope photo: View to the northeast from Hurricane Ridge in the Olympic Mountains across the eastern Strait of Juan de Fuca to the northern Cascade Range. The Dungeness River lowland, capped by late Pleistocene glacial sedi ments, is in the center foreground. Holocene Dungeness Spit is in the lower left foreground. Fidalgo Island and Mount Erie, composed of Jurassic intrusive and Jurassic to Cretaceous sedimentary rocks of the Fidalgo Complex, are visible as the first high point of land directly across the strait from Dungeness Spit. -
Petrography Edward F
Chapter 4 Petrography Edward F. Stoddard A petrographic study was taken in order to help determine the sources of lithic artifacts found at archaeological sites on Fort Bragg. In the first phase of the study, known and suspected archaeological quarry sites in the central Piedmont of North Carolina were visited. From each quarry, hand specimens were collected and petrographic thin sections were examined in an attempt to establish a basis for distinguishing among the quarries. If material from each quarry was sufficiently distinctive, then quarry sources could potentially be matched with Fort Bragg lithic artifacts. Seventy-one samples from 12 quarry zones were examined (Table 4.1). Thirty- one of these samples are from five quarry zones in the Uwharrie Mountains region; 20 of these were collected and described previously by Daniel and Butler (1996). Forty specimens were collected from seven additional quarry zones in Chatham, Durham, Person, Orange, and Cumberland Counties. All quarries are within the Carolina Terrane, except the Cumberland County quarry, which occurs in younger sedimentary material derived primarily from Carolina Terrane outcrops. Rocks include both metavolcanic and metasedimentary types. Compositionally, most metavolcanic rocks are dacitic and include flows, tuffs, breccias, and porphyries. Metasedimentary rocks are metamudstone and fine metasandstone. The Uwharrie quarries are divided into five zones: Eastern, Western, Southern, Asheboro, and Southeastern. The divisions are based primarily on macroscopic petrography and follow the results of Daniel and Butler (1996); the Uwharries Southeastern zone was added in this study. Each of the Uwharrie quarry zones represents three to six individual quarries in relatively close proximity. Rock specimens are all various felsic metavolcanic rocks, but zones may be distinguished based upon mineralogy and texture. -
The Texas Grenville Orogen, Llano Uplift, Texas
THE TEXAS GRENVILLE OROGEN, LLANO UPLIFT, TEXAS Fieldtrip guide to the Precambrian Geology of the Llano Uplift, central Texas by Sharon Mosher, Mark Helper, and Jamie Levine Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin TRIP 405 for THE GEOLOGICAL SOCIETY OF AMERICA ANNUAL MEETING, HOUSTON, TX, FALL 2008 Cosponsored by GSA Structural Geology and Tectonics Division THE TEXAS GRENVILLE OROGEN, LLANO UPLIFT, TEXAS Fieldtrip guide to the Precambrian Geology of the Llano Uplift, central Texas by Sharon Mosher, Mark Helper, and Jamie Levine Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin TRIP 405 for THE GEOLOGICAL SOCIETY OF AMERICA ANNUAL MEETING, HOUSTON, TX, FALL 2008 Cosponsored by GSA Structural Geology and Tectonics Division Cover: Robert M. Reed Copyright by Sharon Mosher 2008 GEOLOGY OF THE LLANO UPLIFT by Sharon Mosher INTRODUCTION The Llano Uplift of central Texas consists of multiply deformed, 1.37-1.23 Ga metasedimentary, metavolcanic and metaplutonic rocks intruded by 1.13 to 1.07 Ga, syn- tectonic to post-tectonic granites (Fig. 1) (Mosher, 1998). An early high-pressure eclogite-facies metamorphism is overprinted by dynamothermal, medium-pressure metamorphism at upper amphibolite-facies conditions and a subsequent low-pressure, middle amphibolite-facies metamorphism associated with widespread intrusion of late granites (Carlson et al., 2007). These rocks are exposed in a gentle structural dome exposing ~9000 km2 of Middle Proterozoic crystalline basement in an erosional window through Phanerozoic sedimentary cover (Muehlberger et al., 1967; Flawn and Muehlberger, 1970). Normal and oblique-slip faults related to the Ouachita Orogeny affect Precambrian to Pennsylvanian rocks and juxtapose Paleozoic strata with the Precambrian exposures.