Session: Great Ideas, Locations, and Outcrops in ...

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Jan 4, 2016 - DEEP TIME IN ALDO LEOPOLD'S, “A SAND COUNTY ALMANAC,” AS ... BOBECK, Patricia, Jackson School of Geosciences, University of Texas .... LAGOR, Samuel, Department of Geology, University of Vermont, 180 Colchester Ave, ... David, Dept. of Geology, Western Washington University, 516 High St.
Session: Great Ideas, Locations, and Outcrops in Geology (2014 GSA An...

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Session No. 160 Monday, 20 October 2014: 1:00 PM-5:00 PM 221/222 (Vancouver Convention Centre-West)

T149. Great Ideas, Locations, and Outcrops in Geology GSA History and Philosophy of Geology Division; History of Earth Sciences Society Renee M. Clary, Michele Aldrich, Alan E. Leviton, Nathalie Nicole Brandes and Paul T. Brandes, Advocates Paper # 160-1

Start Time 1:00 PM HISTORY AND CURRENT STATUS OF THE OPHIOLITE CONCEPT MOORES, Eldridge M., Earth and Planetary Sciences, University of California, Davis, One Shields Avenue, Davis, CA 95616, [email protected]

160-2

1:15 PM ISTHMIAN LINKS: AN IDEA THAT DRIFTED IN A DIFFERENT DIRECTION, 1932-1967 LEVITON, Alan E., Institute of Biodiversity Science and Sustainability, California Academy of Sciences, 55 Music Concourse Drive, San Francisco, CA 94118 and ALDRICH, Michele, California Academy of Sciences, 24 Elm Street, Hatfield, MA 01038, [email protected]

160-3

1:30 PM DEEP TIME IN ALDO LEOPOLD’S, “A SAND COUNTY ALMANAC,” AS INTEGRAL TO MODERN ENVIRONMENTALISM ROSENBERG, Gary D., 1522 N. Prospect Ave, Milwaukee, WI 53202 and NICHOLS, Deborah, Department of Earth Sciences, Indiana University - Purdue University Indianapolis (IUPUI), 723 W. Michigan St., SL 118, Indianapolis, IN 46202, [email protected]

160-4

1:45 PM DARWIN, TRANSMUTATION, AND LIVING FOSSILS BY EXAMPLE LIDGARD, Scott, Integrative Research Center, Field Museum, 1400 S. Lake Shore Dr, Chicago, IL 60605, [email protected]

160-5

2:00 PM CYCLOTHEMS: READING THE ROCK RECORD IN THE MIDCONTINENT BUCHANAN, Rex C., Kansas Geological Survey, University of Kansas, 1930 Constant Avenue, Lawrence, KS 66047-3724 and MAPLES, Christopher G., Oregon Institute of Technology, 3201 Campus Drive, Klamath Falls, OR 97601, [email protected]

160-6

2:15 PM INSTANTANEOUS VERSUS FINITE MOTION OF A LITHOSPHERIC PLATE RELATIVE TO ANOTHER PLATE CRONIN, Vincent S., Department of Geology, Baylor University, One Bear Place #97354, Waco, TX 76798-7354, [email protected]

160-7

2:30 PM COCORP – A GREAT IDEA AND THOSE BEHIND IT BRICE, William R., 116 Luna Lane, Johnstown, PA 15904-3068 and BROWN, Larry D., Earth and Atmospheric Sciences, Cornell University, Ithaca, NY 14853, [email protected] 2:45 PM Break

160-8

3:00 PM THE MCCONNELL THRUST; EVIDENCE FOR PLATE TECTONICS IN THE 1880S BOGGS, Katherine, Earth Sciences, Mount Royal University, 4825 Mount Royal Gate sw, Calgary, AB T3E 6K6, Canada, [email protected]

160-9

3:15 PM ABBE PARAMELLE, 19TH CENTURY KARST HYDROGEOLOGIST BOBECK, Patricia, Jackson School of Geosciences, University of Texas at Austin, P.O. Box 161391, Austin, TX 78716, [email protected]

160-10

3:30 PM TRAVELOGUE OF SCOTLAND: VENERABLE OUTCROPS AND THE VISIONARY GEOLOGISTS WHO STUDIED THEM EVANS, Kevin Ray, Geography, Geology, and Planning, Missouri State University, 901 S. National Ave, Springfield, MO 65897 and WILLIAMS, Nancy S., Geography, Geology, & Planning, Missouri State University, 901 S. National Ave, Springfield, MO 65897, [email protected]

160-11

3:45 PM THE PORPHYROBLASTS OF THE BOSSòST DOME, CENTRAL PYRENEES: DISCOVERING THE RELATIONSHIP BETWEEN METAMORPHISM AND DEFORMATION MEZGER, Jochen E., Geosciences, University of Alaska Fairbanks, 900 Yukon Drive, Fairbanks, AK 99775, [email protected]

160-12

4:00 PM PENROSE’S WHAT A GEOLOGIST CAN DO IN WAR: A CAUSE AND EFFECT LOOK OLSEN, Joshua E.S., Geology and Environmental Geosciences, Northern Illinois University, Davis Hall 312, Normal Rd, DeKalb, IL

1/4/2016 6:46 PM

Abstract: THE PORPHYROBLASTS OF THE BOSSòST DOME, CEN...

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Paper No. 160-11 Presentation Time: 3:45 PM

THE PORPHYROBLASTS OF THE BOSSòST DOME, CENTRAL PYRENEES: DISCOVERING THE RELATIONSHIP BETWEEN METAMORPHISM AND DEFORMATION MEZGER, Jochen E., Geosciences, University of Alaska Fairbanks, 900 Yukon Drive, Fairbanks, AK 99775, [email protected] Microtectonics and the concept of syn-tectonic porphyroblast growth have their roots in the meticulous mapping projects that the University of Leiden in the Netherlands undertook in the Central Pyrenees from the late 1950's on. Studying metamorphic rocks of the Bossòst (Garonne) dome, and erroneously cutting thin sections parallel to mineral lineation rather than perpendicular, as it was the custom in those days, Henk Zwart (1924-2012) noticed the interference patterns of foliation and porphyroblasts. The results were published in 1960 and 1962 in the Geologische Rundschau, thus changing the way crystalline geologists looked at metamorphic rocks, and mica schists in particular, ever since. Unlike folds, faults or shear zones, outcrops of regional metamorphic rocks are rarely spectacular. This also holds true to the key outcrop of Zwart's study which is located on a small forestry road along the northern slope of the Aran valley in the Spanish Pyrenees, 800 m northwest of the village of Arres. The rock exposed here is a mica schist with prominent reddish brown idioblastic staurolite crystals up to 6 mm in diameter. Rotation of the blasts can be inferred from deflection and drag folding of schistosity. The plane of view is oriented favourably, parallel to a distinctly recognizable mineral lineation. One can also observe ubiquitous dark centimetre-sized cordierite crystals with rounded or oblate shapes and curved tails that give them a sigmoida appearance. A casual field geologist would identify them as syn-tectonic porphyroblasts, as markers on the outcrop face attest. Thin sections, however, reveal a different, more complex story. Cordierites overgrew smaller rotated staurolite blasts and the foliation they deflect, defining cordierite as a post-tectonic porphyroblasts overgrowing inter-tectonic staurolites. The cordierite-staurolite schist of the Bossòst dome teaches the important lesson that the obvious is not always correct, and attest to the power of microstructural studies. Session No. 160 T149. Great Ideas, Locations, and Outcrops in Geology Monday, 20 October 2014: 1:00 PM-5:00 PM 221/222 (Vancouver Convention Centre-West) Geological Society of America Abstracts with Programs. Vol. 46, No. 6, p.405 © Copyright 2014 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions. See more of: Great Ideas, Locations, and Outcrops in Geology See more of: Topical Sessions >

1/4/2016 6:47 PM

Session: Mechanisms, Rates, and Timescales of Texture Formation in Me...

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Session No. 49 Sunday, 19 October 2014: 9:00 AM-5:00 PM Exhibition Hall C (Vancouver Convention Centre-West)

T217. Mechanisms, Rates, and Timescales of Texture Formation in Metamorphic Rocks (Posters) GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division Authors will be present from 3:00 to 5:00 PM. Paper # 49-1

Booth # 271 PETROLOGIC AND GEOCHEMICAL CHARACTERIZATION OF ARCHEAN GNEISSES IN THE LITTLE ELK TERRANE, BLACK HILLS, SOUTH DAKOTA NICOSIA, Christopher, Department of Geoscience, Winona State University, PO Box 5838, Winona, MN 55987 and ALLARD, Stephen T., Department of Geoscience, Winona State University, P.O. Box 5838, Winona, MN 55987, [email protected]

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272 CL-ENRICHMENT OF HYDROUS MINERALS IN ARCHEAN GRANULITE-FACIES IRONSTONES, BEARTOOTH MOUNTAINS, MONTANA, USA DAIGLE, Nicholas M., Dept. of Geology & Geophysics, Louisiana State University, Baton Rouge, LA 70803 and HENRY, Darrell J., Dept. of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, [email protected]

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273 SEVE NAPPE COMPLEX METAMORPHISM AND U-PB SPHENE GEOCHRONOLOGY IN THE TARFALA VALLEY OF THE KEBNEKAISE MASSIF, NORTHERN SWEDISH CALEDONIDES BAIRD, Graham B., Earth and Atmospheric Sciences, University of Northern Colorado, Campus Box 100, Greeley, CO 80639, KORHONEN, Fawna J., Geological Survey of Western Australia, 100 Plain St, East Perth WA, 6004, Australia and CHAMBERLAIN, Kevin R., Dept. of Geology and Geophysics, University of Wyoming, Dept. 3006, 1000 University Avenue, Laramie, WY 82071, [email protected]

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274 COMBINED U-TH-PB MONAZITE AND LU-HF GARNET AGES FROM THE ALPINE SCHIST: IMPLICATIONS FOR THE TIMING AND DURATION OF BARROVIAN METAMORPHISM IN THE SOUTHERN ALPS, NEW ZEALAND BRIGGS, Sophie1, COTTLE, John1 and HAGEN-PETER, Graham A.2, (1)Department of Earth Science, University of California, Santa Barbara, CA 93106, (2)Department of Earth Science, University of California, Santa Barbara, 1006 Webb Hall-MC 9630, Santa Barbara, CA 93106-9630, [email protected]

49-5

275 USE OF GARNET ZONING AND PSEUDOSECTION MODELING TO CONSTRAIN THE P-T PATH OF METAPELITIC TECTONITES IN THE SNOW PEAK AREA, NORTHERN IDAHO LANG, Helen M., JOHNSON, Sarah E. and LARGENT, Kacey J., Dept. Geology & Geography, West Virginia Univ, P.O. Box 6300, Morgantown, WV 26506-6300, [email protected]

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276 THE RELATIONSHIP BETWEEN MAGMATISM, DEFORMATION, AND METAMORPHISM DURING THE ACADIAN OROGENY: A CASE STUDY FROM THE KNOX MOUNTAIN PLUTON, GREEN MOUNTAINS, VERMONT LAGOR, Samuel, Department of Geology, University of Vermont, 180 Colchester Ave, Burlington, VT 05405 and WEBB, Laura E., Dept. of Geology, University of Vermont, Burlington, VT 05405, [email protected]

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277 SPATIAL AND TEMPORAL DISTRIBUTION OF TRACE ELEMENTS WITHIN METAMORPHIC GARNET FROM TOWNSHEND DAM, VERMONT WEINER, Kirsten Lee, Geology Department, Western Washington University, 516 High Street, Bellingham, WA 98225, HIRSCH, David, Dept. of Geology, Western Washington University, 516 High St., MS9080, Bellingham, WA 98225 and RUSK, Brian, Geology Department, Western Washington University, 516 High St. MS 9080, Bellingham, WA 98225, [email protected]

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278 ZONED GARNETS FROM THE ANAKEESTA FORMATION, GREAT SMOKY MOUNTAINS NATIONAL PARK, USA ISAVA, Virginia, Earth & Ocean Sciences, Duke University, Duke Box #98532, Durham, NC 27708 and BOUDREAU, Alan E., Earth & Ocean Sciences, Duke University, Old Chemistry Building, Box 90227, Durham, NC 27708, [email protected]

49-9

279 EARLY AND LATE CARBONIFEROUS MAGMATISM IN THE VARISCIDES OF THE CENTRAL PYRENEES: SOLUTION TO A TECTONIC CONTRADICTION AND A NEW MAGMATIC ENIGMA MEZGER, Jochen E., Geosciences, University of Alaska Fairbanks, 900 Yukon Drive, Fairbanks, AK 99775, [email protected]

1/4/2016 6:49 PM

Abstract: EARLY AND LATE CARBONIFEROUS MAGMATIS...

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Paper No. 49-9 Presentation Time: 11:00 AM

EARLY AND LATE CARBONIFEROUS MAGMATISM IN THE VARISCIDES OF THE CENTRAL PYRENEES: SOLUTION TO A TECTONIC CONTRADICTION AND A NEW MAGMATIC ENIGMA MEZGER, Jochen E., Geosciences, University of Alaska Fairbanks, 900 Yukon Drive, Fairbanks, AK 99775, [email protected] Magmatic activity in the Variscan Pyrenees has previously been confined to the late Carboniferous (ca. 310-298 Ma). This poses tight temporal constrictions on the tectonometamorphic evolution of gneiss domes in the Pyrenees, confing the main Variscan deformation phase to the Westphalian-Stephanian. New geochronological studies of deep seated granite intrusions and migmatites within the core zone of gneiss and structural-metamorphic domes extend the early phase of deformation and high temperature metamorphism back to the Visean (ca. 340 Ma), the intrusive ages of the Bossòst and Soulcem granites of the Central Pyrenees. This discovery solves apparent contradictions of the earlier model, e.g. granite intrusions on one hand enhance the development of schistosity in orthogneisses, which, on the other hand, is also crosscut by granite plutons. The older intrusions can be distinguished from younger Bassiès and Mont Louis-Andorra plutons by high temperature contact metamorphism and migmatization. The new results show that HT metamorphism, the development of flat-lying schistosity, and the early phase of dome formation in the Central Pyrenees already occurred during the Visean. Though previously unknown in the Pyrenees, early Carboniferous magmatism (340-330 Ma) is reported from other European Variscan orogens, e.g. Montagne Noire, Massif Central. This raises the question of the origin of Visean magmatism. Recent plate tectonic reconstructions place the Variscan Pyrenees to the northern margin of the Palaeothetys or at an intracontinental subduction zone; both are in agreement with compressional tectonic setting associated with the Visean intrusions. Isotopical and geochemical studies are required to determine the nature of early Carboniferous magmas, and help solve a new and crucial puzzle in the evolution of the southern European Variscides. Session No. 49 T217. Mechanisms, Rates, and Timescales of Texture Formation in Metamorphic Rocks (Posters) Sunday, 19 October 2014: 9:00 AM-5:00 PM Exhibition Hall C (Vancouver Convention Centre-West) Geological Society of America Abstracts with Programs. Vol. 46, No. 6, p.141 © Copyright 2014 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions. See more of: Mechanisms, Rates, and Timescales of Texture Formation in Metamorphic Rocks (Posters) See more of: Topical Sessions >

1/4/2016 6:49 PM