Session: T3. Shallowing and Steepening Subduction Zones IV (Backbone of the Americas

Paper #

Start Time

1

8:30 AM

THE ACTIVE ANDEAN OROGENIC FRONT AT THE SOUTHERNMOST PAMPEAN FLAT-SLAB

COSTA, Carlos H.¹, GARDINI, Carlos E.², DIEDERIX, Hans³, CISNEROS, Hector A.¹ and AHUMADA, Emilio A.², (1)Departamento de Geología, Universidad Nacional de San Luis, Chacabuco 917, 5700 San Luis, Argentina, (2)Departamento de Geología, Universidad Nacional de San Luis-CONICET, Chacabuco 917, San Luis, 5700, Argentina, (3)Vosmanskamp 12, EZ Schalkhaar, 7433, Netherlands, costa@unsl.edu.ar, costa@unsl.edu.ar

2

8:50 AM

REFOLDING OF THIN-SKINNED THRUST SHEETS BY ACTIVE BASEMENT-INVOLVED THRUST FAULTS IN THE EASTERN PRECORDILLERA OF WESTERN ARGENTINA

MEIGS, Andrew, College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 Wilkinson Hall, Oregon State Univesity, Corvallis, OR 97331, KRUGH, William C., Earth Science, Institute of Geology, ETH Zentrum, Sonneggstrasse 5, Zurich, CH-8092, Switzerland, SCHIFFMAN, Celia, Geosciences, Oregon State Univ, 104 Wilkinson Hall, Corvallis, OR 97331-5506, VERGES, Jaume M., Inst Ciencias de la Terra, Jaume Almera CSIC, Lluis Sole i Sabaris s/n, Barcelona, 08028, Spain and RAMOS, Victor A., Laboratorio de Tectónica Andina, Universidad de Buenos Aires, Cuidad universitaria, Buenos Aires, 1428, Argentina, meigsa@geo.orst.edu, meigsa@geo.orst.edu

3

9:10 AM

ON RECURRENT RIFTING AND SYNPLUTONIC HEALING OF THE CHILEAN-ARGENTINIAN ANDEAN BACKBONE

GODOY, Estanislao, Regional Geology, Servicio Nacional de Geologia y Minería, Av. Santa Maria 0104, Providencia, Santiago, 6760197, Chile, egodoy@sernageomin.cl, egodoy@sernageomin.cl

4

9:30 AM

CENOZOIC EXTENSION VS. COMPRESSION IN THE CENTRAL NEUQUEN BASIN (S37° - S36°, ARGENTINA)

BACKÉ, Guillaume, HERVOUËT, Yves and DHONT, Damien, CNRS UMR 5212, Université de Pau et des Pays de l'Adour, I.P.R.A, Avenue de l'Université, pau, 64000, France, guillaume.backe@univ-pau.fr, guillaume.backe@univ-pau.fr

5

9:50 AM

CRUSTAL COLLAPSE IN THE SOUTHERN ANDES AFTER SHALLOW SUBDUCTION (34º30-40º30S)

FOLGUERA, Andres¹, LITVAK, Vanesa D.¹, GARCIA MORABITO, Ezequiel¹, RAMOS, Victor A.¹, BOTTESI, Germán L.² and ZAPATA, Tomas³, (1)Departasmento de Geología, Universidad de Buenos Aires, Pabellon 2 de Ciudad Universitaria, Capital Federal, Buenos Aires, 1428, Argentina, (2)Direccion de Exploracion y Desarrollo ABB Faja Plegada Argentina Repsol YPF, Repsol YPF, Esmeralda 255 piso 10 of 1001, Buenos Aires, 1035, Argentina, (3)Direccion de Exploracion y Desarrollo ABB Faja Plegada Argentina Repsol YPF, Repsol YPF, Esmeralda 255 piso 10, Buenos Aires, 1035, Argentina, andresfolguera2@yahoo.com.ar, andresfolguera2@yahoo.com.ar

10:10 AM

Break

6

10:30 AM

TECTOGENIC SEDIMENT DISPERSAL FROM RETROARC FORELAND OROGENIC WEDGES: EXAMPLES FROM THE CORDILLERA OF NORTH AND SOUTH AMERICA

SCHMITT, James G., Department of Earth Sciences, Montana State University, Bozeman, MT 59717 and COSTA, Carlos H., Departamento de Geología, Universidad Nacional de San Luis, Chacabuco 917, 5700 San Luis, Argentina, jschmitt@montana.edu, jschmitt@montana.edu

7

10:50 AM

THE CRUSTAL STRUCTURE OF THE BROOKS RANGE OROGENIC BELT—THE BACKBONE OF ALASKA

MOORE, Thomas E., U.S. Geological Survey, M.S. 901, 345 Middlefield Road, Menlo Park, CA 94025, FUIS, Gary S., U.S. Geol Survey, 345 Middlefield Road, Mail Stop 977, Menlo Park, CA 94025, POTTER, Christopher J., U.S. Geological Survey, Mail Stop 939, Denver Federal Center, Denver, CO 80225-0046 and O'SULLIVAN, Paul B., Apatite to Zircon, Inc, 1075 Matson Road, Viola, ID 83872-9705, tmoore@usgs.gov, tmoore@usgs.gov

8

11:10 AM

BASEMENT-INVOLVED FORELAND DEFORMATION IN NORTHEASTERN ALASKA—STRUCTURAL STYLE, CORDILLERAN ANALOGS, AND TECTONIC DRIVERS

POTTER, Christopher J., U.S. Geological Survey, M.S. 939, Denver Federal Center, Denver, CO 80225-0046, MOORE, Thomas E., U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025 and O'SULLIVAN, Paul B., Apatite to Zircon, Inc, 1075 Matson Road, Viola, ID 83872-9705, cpotter@usgs.gov, cpotter@usgs.gov

9

11:30 AM

WHAT FLAT-SLAB SUBDUCTIONS CAN DO: AN EXAMPLE FROM MESOZOIC SOUTH CHINA

LI, Zheng-Xiang, School of Earth and Geographical Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia and LI, Xian-Hua, Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, PO Box 1131, Guangzhou, 510640, China, zli@tsrc.uwa.edu.au, zli@tsrc.uwa.edu.au

10

11:50 AM

TECTONIC SHUFFLE ZONES: LITHOSPHERE-SCALE MOVEMENT ZONES THAT REVERSE THEIR SHEAR SENSE DURING OROGENESIS

FORSTER, Marnie and LISTER, Gordon, Research School of Earth Sciences, The Australian National University, Canberra, 0200, Australia, marnie.forster@anu.edu.au, marnie.forster@anu.edu.au

11

12:10 PM

GONDWANAN - SOUTH AMERICAN CONNECTIONS IN TACONIAN, ACADIAN-CALEDONIAN, AND YOUNGER OROGENIC RECORDS IN THE NORTHERN APPALACHIANS AND NORWEGIAN CALEDONIDES (II)

ROBINSON, Peter¹, TUCKER, Robert D.², HOLLOCHER, Kurt T.³, THOMPSON, Peter J.⁴, BERRY IV, Henry N.⁵, OSBERG, Philip H.⁶, VAN STAAL, Cees R.⁷, DAVID, Roberts¹, MELEZHIK, Victor A.¹ and NORDGULEN, Øystein¹, (1)Geol Survey of Norway, Trondheim, N7491, Norway, (2)Department of Earth and Planetary Sciences, Washington Univ, St Louis, MO 63130, (3)Geology Department, Union College, Nott St, Schenectady, NY 12308, (4)Earth Sciences Dept, Univ of New Hampshire, Durham, NH 03824, (5)Maine Geological Survey, 22 State House Station, Augusta, ME 04333, (6)PO Box 224, Orono, ME 04473-0224, (7)Geol Survey of Canada, 601 Booth St, Ottawa, ON K1A 0E8, peter.robinson@ngu.no, peter.robinson@ngu.no

Backbone of the Americas—Patagonia to Alaska, (3–7 April 2006)

T3. Shallowing and Steepening Subduction Zones IV