Session: Rifting, Drifting, and Accretion of Microcontinental Terranes: A Recipe for Accretionary Orogens (2013 GSA Annual Meeting in Denver: 125th Anniversary of GSA (27-30 October 2013))

THE ROLE OF RIFT-INHERITED HYPEREXTENSION FOR THE FORMATION OF COLLISIONAL OROGENS: INSIGHTS FROM THE ALPS (WESTERN EUROPE)
Abstract ID#: 226788

MOHN, Geoffroy¹, MANATSCHAL, Gianreto², BELTRANDO, Marco³, and HAUPERT, Isabelle², (1) Department of Geosciences and Environment, Université Cergy-Pontoise, 5, mail Gay Lussac, Neuville-sur-Oise, 95031, France, Geoffroy.Mohn@u-cergy.fr, (2) Institut de Physique du Globe de Strasbourg, Université de Strasbourg, 1 rue Blessig, Strasbourg, 67084, France, (3) Dipartimento di Scienze Mineralogiche e Petrologiche, Università di Torino, Via Valperga Caluso 35, Torino, 10125, Italy

THE ROLE AND SIGNIFICANCE OF RIBBON CONTINENTS IN ACCRETIONARY OROGENS AND THE SUPERCONTINENT CYCLE
Abstract ID#: 228138

JOHNSTON, Stephen T., School of Earth and Ocean Sciences, University of Victoria, Bob Wright Centre, PO Box 3065 STN CSC, Victoria, BC V8W 3V6 Canada, stj@uvic.ca

MICROPLATES AND EXOTIC, DISPLACED TERRANES: CONTRIBUTIONS FROM PALEOMAGNETISM
Abstract ID#: 222561

VAN DER VOO, Rob, Earth & Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, voo@umich.edu

BIRCHY COMPLEX, BAIE VERTE PENINSULA, NORTHWEST NEWFOUNDLAND: A PRODUCT OF LATE EDIACARAN HYPER-EXTENSION OF THE LAURENTIAN IAPETAN MARGIN AND IMPLICATIONS FOR THE OPENING OF IAPETUS AND FORMATION OF PERI-LAURENTIAN MICRO-CONTINENTS
Abstract ID#: 223237

VAN STAAL, Cees¹, CHEW, David M.², ZAGOREVSKI, Alexandre³, MCNICOLL, Vicki³, HIBBARD, James⁴, SKULSKI, Tom⁵, CASTONGUAY, Sébastien⁶, ESCAYOLA, Monica⁷, and SYLVESTER, P.J.⁸, (1) Geological Survey of Canada, 1500-605 Robson Street, Vancouver, BC V6B 5J3, Canada, cvanstaa@NRCan.gc.ca, (2) Department of Geology, Trinity College, Dublin, Dublin 2, Ireland, (3) Geological Survey of Canada, 601 Booth St, Ottawa, ON K1A 0E8, Canada, (4) Marine, Earth, and Atmospheric Sciences, North Carolina State U, Box 8208, Raleigh, NC 27695, (5) Geological Survey of Canada, 601 Booth Street, Ottawa, ON K1A 0E8, Canada, (6) Geological Survey of Canada, 490 rue de la Couronne, Québec, QC G1K 9A9, Canada, (7) Conicet, University of Buenos Aires, Buenos Aires, C1428EHA, Argentina, (8) Department of Earth Sciences, Memorial University of Newfoundland, St John's, NF A1B3X5, Canada

EVIDENCE FOR RIFTING AND ACCRETION OF THE ARGENTINE PRECORDILLERA MICROCONTINENTAL TERRANE
Abstract ID#: 232368

THOMAS, William A., Geological Survey of Alabama, P.O. Box 869999, Tuscaloosa, AL 35486-6999, geowat@uky.edu and ASTINI, Ricardo A., Laboratorio de Análisis de Cuencas, Universidad Nacional de Córdoba, Av. Velez Sarsfield 1611, 2º piso, of. 7, Córdoba, X5016GCA, Argentina

GANDERIA-LAURENTIA COLLISION IN THE CALEDONIDES OF GREAT BRITAIN AND IRELAND
Abstract ID#: 232062

WALDRON, John W.F.¹, SCHOFIELD, David I.², DUFRANE, S. Andrew³, FLOYD, James D.⁴, CROWLEY, Quentin C.⁵, SIMONETTI, Antonio⁶, DOKKEN, Robert¹, and POTHIER, Hayley¹, (1) Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G2E3, Canada, john.waldron@ualberta.ca, (2) British Geological Survey, Columbus House, Tongwynlais, Cardiff, CF15 7NE, United Kingdom, (3) Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, (4) School of the Built Environment, Heriot-Watt University, Murchison House, West Mains Road, Edinburgh, EH9 3LA, United Kingdom, (5) Department of Geology, Museum Building, Trinity College Dublin, Dublin, 2, Ireland, (6) Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556

ACCRETION TECTONICS AND ASSEMBLY OF THE COMPOSITE PERI-GONDWANAN CONTINENTAL MARGIN IN THE UK
Abstract ID#: 220541

SCHOFIELD, David I.¹, LESLIE, Graham², WILBY, Philip R.³, DARTNALL, Rosemary⁴, WALDRON, John W.F.⁵, and POTHIER, Hayley⁵, (1) British Geological Survey, Columbus House, Tongwynlais, Cardiff, CF15 7NE, United Kingdom, dis@bgs.ac.uk, (2) British Geological Survey, Murchison House, West Mains Road, Edinburgh, EH9 3LA, United Kingdom, (3) British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham, NG12 5GG, United Kingdom, (4) School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom, (5) Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G2E3, Canada

Break
Abstract ID#: 234440

USE OF TH/U RATIOS TO ELUCIDATE TERRANE AFFINITY AND TIMING OF ORDOVICIAN UNROOFING OF SEDIMENT SOURCES TO THE SOUTH OF THE SOUTH MAYO TROUGH, WESTERN IRELAND
Abstract ID#: 229678

RIGGS, Nancy, Geology, School of Earth Sciences and Environmental Sustainability, Northern Arizona University, Flagstaff, AZ 86011-4099, nancy.riggs@nau.edu, MCCONNELL, Brian, Geological Survey of Ireland, Beggars Bush, Dublin, 4, Ireland, CROWLEY, Quentin C., Department of Geology, Museum Building, Trinity College Dublin, Dublin, 2, Ireland, and CHEW, David M., Department of Geology, Trinity College, Dublin, Dublin 2, Ireland

WESTWARD SUBDUCTION OF NORTH AMERICA DURING THE SEVIER EVENT
Abstract ID#: 222069

HILDEBRAND, Robert S., Department of Geology, University of California, Davis, CA 95616-8605, bob@roberthildebrand.com

CRUSTAL GROWTH BY TECTONIC ACCRETION OF ISLAND ARC TERRANES: RADIOISOTOPIC PROVENANCE OF LATE PALEOZOIC–MESOZOIC ROCKS OF THE BLUE MOUNTAINS, WESTERN UNITED STATES
Abstract ID#: 230732

LAMASKIN, Todd A., Department of Geography and Geology, University of North Carolina Wilmington, 601 South College Road, Wilmington, NC 28403-5944, lamaskint@uncw.edu, VERVOORT, Jeffrey D., School of Earth and Environmental Sciences, Washington State University, Pullman, WA 99164, and DORSEY, Rebecca J., Department of Geological Sciences, University of Oregon, 1272 University of Oregon, Eugene, OR 97403

INTERPRETING SUBDUCTION POLARITY FROM ECLOGITE-BEARING SLICES IN ACCRETIONARY OROGENS—A CAUTIONARY NOTE FROM THE YUKON–TANANA TERRANE
Abstract ID#: 227246

GILOTTI, Jane A.¹, MCCLELLAND, William C.¹, PETRIE, Meredith¹, and VAN STAAL, Cees R.², (1) Department of Earth and Environmental Sciences, University of Iowa, 121 Trowbridge Hall, Iowa City, IA 52242, jane-gilotti@uiowa.edu, (2) Geological Survey of Canada, 625 Robson Street, Vancouver, BC V6B 5J3, Canada

EVOLUTION OF CORDILLERAN CONVERGENT MARGINS—IMPLICATIONS OF OFFSHORE OBSERVATIONS THAT ARC-TRENCH WIDENING OF THE ALASKA MARGIN WAS NOT CAUSED BY ACCRETIONARY ADDITIONS TO THE OUTER FOREARC
Abstract ID#: 224813

SCHOLL, David, Geology and Geophysics, University of Alaska Fairbanks and U.S. Geological Survey, 345 Middlefield Rd, MS 999, Menlo Park, CA 94025, dscholl@usgs.gov and VON HUENE, Roland, U.S. Geological Survey, 345 Middlefield Rd. MS 999, Menlo Park, CA 94025

TRACKING MESOZOIC ACCRETIONARY DYNAMICS IN THE NORTHERN ANDES OF COLOMBIA THROUGH AR-AR DATING OF SHEAR ZONES AND (U-TH)/HE - FISSION TRACK THERMOCHRONOLOGY OF PLUTONIC MASSIFS (APATITE AND ZIRCON).&NBSP;
Abstract ID#: 234010

VINASCO, Cesar, Geociencias, Universidad Nacional de Colombia - Medellin, Medellin, 000004, Colombia, cvinasco@unal.edu.co, RESTREPO-MORENO, Sergio Andrés, Ingeniería Geológica, Escuela de Ingeniería de Antioquia, Km 2 + 200 Vía Aeropuerto J.M. Córdova, Sede Las Palmas, Envigado, 00001, Colombia, BERNET, Matthias, Institut de Science de la Terre, Université Joseph Fourier, OSUG C - BP 53 - 1381 Rue de la Piscine, Grenoble Cedex, 38041, NORIEGA, Santiago, Escuela de Geociencias y Medio Ambiente, Universidad Nacional de Colombia, Carrera 80 No. 65-223, Medellin, 0001, Colombia, and MARIN-CERON, Maria Isabel, Departamento de Geología, Universidad EAFIT, Carrera 49 N° 7 Sur - 50, Medellín, 00001, Colombia

Discussion
Abstract ID#: 234441

185. T185. Rifting, Drifting, and Accretion of Microcontinental Terranes: A Recipe for Accretionary Orogens

185.
T185. Rifting, Drifting, and Accretion of Microcontinental Terranes: A Recipe for Accretionary Orogens