Backbone of the Americas—Patagonia to Alaska, (3–7 April 2006)
Session No. 3 Monday, 3 April 2006
10:35 AM-7:45 PM, Congress & Exhibition Center: Foyer and Auditorio Bustelo

T3. Shallowing and Steepening Subduction Zones I

 Paper #Booth #
3-134A POTENTIAL MECHANISM FOR SLAB UN-FLATTENING: PATEL, Paresh1, LAVIER, Luc2, and GRAND, Steve P.1, (1) Geology Department, University of Texas at Austin, 1 University Station C1100, Austin, TX 78712, warlord@mail.utexas.edu, (2) University of Texas Institute for Geophysics, The University of Texas at Austin, 4412 Spicewood Springs Rd. #600, Austin, TX 78759
3-235MARGIN CURVATURE RELATED TO SUBDUCTION OF OBLIQUE ASEISMIC RIDGES: JAPAS, M.S., Departamento de Ciencias Geológicas, Universidad de Buenos Aires, CONICET, Fac. Cs. Exac. y Nat, PAB. 2 - Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina, msjapas@gl.fcen.uba.ar and RE, G.H., Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Fac. Cs. Exac. y Nat, PAB. 2 - Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
3-336CHANGING PROVENANCE OF LATE CRETACEOUS-EARLY CENOZOIC SEDIMENTS IN SOUTHERN CALIFORNIA RELATED TO FLAT SUBDUCTION: JACOBSON, Carl E.1, GROVE, Marty2, PEDRICK, Jane N.3, BARTH, Andrew P.4, and VUCIC, Ana2, (1) Dept of Geological and Atmospheric Sciences, Iowa State Univ, Ames, IA 50011-3212, cejac@iastate.edu, (2) Dept. of Earth and Space Sciences, Univ. of California, Los Angeles, CA 90095-1567, (3) Dept of Geological & Atmospheric Sciences, Iowa State Univ, Ames, IA 50011-3212, (4) Department of Geology, Indiana Univ-Purdue Univ, Indianapolis, IN 46202
3-437LATE CRETACEOUS-EOCENE DENUDATION OF THE PENINSULAR RANGES BATHOLITH OF SOUTHERN AND BAJA CALIFORNIA: LOVERA, Oscar M.1, GROVE, Marty1, KIMBROUGH, David L.2, MAHONEY, J. Brian3, ABBOTT, Pat L.2, JACOBSON, Carl E.4, NOURSE, Jon A.5, and GEHRELS, George E.6, (1) Earth and Space Sciences, UCLA, 3806 Geology, Los Angeles, CA 90095, lovera@ucla.edu, (2) Department of Geological Sciences, SDSU, San Diego, CA 92182-1020, (3) Department of Geology, University of Wisconsin, Eau Claire, WI 54701, (4) Dept of Geological and Atmospheric Sciences, Iowa State Univ, Ames, IA 50011-3212, (5) Department of Geological Sciences, California State Polytechnic University, 3801 W. Temple Avenue, Pomona, CA 91768, (6) Dept. of Geosciences, Center for Mineral Resources, University of Arizona, Tucson, AZ 85721-0077
3-538RAPID EARLY EOCENE EXTENSION FOLLOWING LARAMIDE SHALLOW SUBDUCTION IN THE NORTHERN ROCKY MOUNTAINS REGION: FOSTER, David A., Department of Geological Sciences, University of Florida, PO Box 112120, Gainesvile, FL 32611, dafoster@ufl.edu
3-639THREE-DIMENSIONAL KINEMATIC HISTORY OF THE WYOMING SALIENT OF THE SEVIER OROGENIC BELT: YONKEE, Adolph, Department of Geosciences, Weber State University, 2507 University Circle, Ogden, UT 84408, ayonkee@weber.edu, WEIL, Arlo, Department of Geology, Bryn Mawr College, Bryn Mawr, PA 19010, and SUSSMAN, Aviva J., EES-11, Los Alamos National Laboratory, Los Alamos, NM 87545
3-740LINKS BETWEEN THRUST-BELT KINEMATICS, FORELAND BASIN ARCHITECTURE AND DEPOSITIONAL PROCESS CHANGE: A 500 KM TRANSECT THROUGH THE NORTH AMERICAN CORDILLERAN FORELAND BASIN, UTAH AND COLORADO, USA: ASCHOFF, J.L. and STEEL, R.J., Jackson School of Geosciences, University of Texas at Austin, 1 University Station C1100, Austin, TX 78712-0254, jaschoff@mail.utexas.edu
3-841EVIDENCE OF FOSSIL FLAT SUBDUCTION IN TOMOGRAPHIC IMAGES: BEDLE, Heather and VAN DER LEE, Suzan, Geological Sciences, Northwestern University, 1850 Campus Dr, Evanston, IL 60208, heather@earth.northwestern.edu
3-942LOW ANGLE SUBDUCTION IN NORTHEASTERN MÉXICO DURING EOCENE TIME: CHÁVEZ-CABELLO, Gabriel, Facultad de Ciencias de la Tierra, Universidad Autónoma de Nuevo León, Ave. Universidad S/N, Col. Ciudad Universitaria, San Nicolás de Los Garza, 66451, Mexico, gabchave2001@yahoo.com.mx and ARANDA-GÓMEZ, José Jorge, Centro de Geociencias, Universidad Nacional Autónoma de México, Ave. del Mesón S/N, Juriquilla, Querétaro, 76230, Mexico
3-1043TECTONIC EVOLUTION OF THE FAULTS AND FOLDS PROVINCE AND THE MEXICAN VOLCANIC BELT IN SOUTH CENTRAL HIDALGO, MEXICO: ESCAMILLA-CASAS, José C., ORTIZ HERNANDEZ, Luis E., BARRERA GUERRERO, Santa, and RAMÍREZ CARDONA, Màrius, Centro de Investigacion en Ciencias de la Tierra, Universidad Autonoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo, km 4.5, Pachuca, 42184, Mexico, jocesca@uaeh.reduaeh.mx
3-1144SUBSIDENCE HISTORY OF THE BARBADOS ACCRETIONARY COMPLEX: LEVANTI, Ariannella Jr, Earth Sciences, Universidad Simon Bolivar, Sartenejas Valley, Baruta County, Caracas, 89000, Venezuela, alevanti@usb.ve and JÁCOME, María I. Sr, Earth Sciences, Universidad Simon Bolivar, Sartenejas Valley, Baruta County, Miranda State, Caracas, 1080/89000, Venezuela
3-1245IN THE WAKE OF FLAT SUBDUCTION: UPPER-PLATE TECTONICS ACROSS A STEEP TO FLAT SLAB TRANSITION, PACIFIC MARGIN, COSTA RICA, CENTRAL AMERICA: MARSHALL, Jeffrey S., LAFROMBOISE, Eli J., and UTICK, John D., Geological Sciences Dept, Cal Poly University, Pomona, CA 91768, marshall@csupomona.edu
3-1346TECTONIC AND CLIMATE INDUCED UPHEAVAL OF THE NORTHERN ANDES DURING THE LAST 12 MY: LÓPEZ, Eduardo, Regional Geology, INGEOMINAS, Cll 52 Nº 19 - 21 apto 501, Dg 53 Nº 34 - 53, Bogota, 001, Colombia, tectolopez@yahoo.es and MARTÍNEZ, José I., Geology, EAFIT, Medellin, 001, Colombia
3-1447THE INTERMEDIATE SEISMICITY ZONE OF THE WESTERN COLOMBIA: VARGAS, Carlos Alberto, Geociencias, Universidad Nacional de Colombia, Cra 30 #45-02, Ed. Manuel Ancizar, Bogotá, Colombia, cavargasj@unal.edu.co, CHICANGANA, Germán, Facultad de Ingeniería, Corporación Universitaria del Meta, Villavicencio, Colombia, and KAMMER, Andreas, Geocienicas, Universidad Nacional de Colombia, Cra 30 #45-02, Ed. Manuel Ancizar, Bogotá
3-1548TECTONIC ANALYSIS OF NORTHWESTERN SOUTH AMERICA FROM INTEGRATED SATELLITE, AIRBORNE AND SURFACE POTENTIAL FIELD ANOMALIES: HERNANDEZ, Orlando1, VON FRESE, Ralph R.B.1, and KIM, Hyung Rae2, (1) Geological Sciences, The Ohio State University, 125 South Oval Mall, 375 Mendenhall Lab, Columbus, OH 43210-1308, hernandez.135@osu.edu, (2) Goddard Earth Sciences & Technology Center at Goddard Flight Space Center, National Aeronautics and Space Administration, NASA, Code 921, Geodynamics Branch, GSFC/NASA, Greenbelt, MD 20771
3-1649INTEGRACION GEOLOGICA Y GEOFISICA DEL TRANSECTO “PUERTO MAYA-SAN JUAN DE LOS MORROS, VENEZUELA”: DELGADO, Jesús, PRADA, Giovanni, YEPEZ, Sidonio, RODRIGUEZ, Inirida, and ALEZONES, Ricardo, Geologia, Universidad Central de Venezuela, Caracas- Ciudad Universitaria Ingenierìa Escuela de Geología Minas y Geofisica, Caracas, Venezuela, iniromil@yahoo.com.mx
3-1750EMPLACEMENT AND EXHUMATION OF THE CORDILLERA BLANCA BATHOLITH, PERU: GIOVANNI, Melissa K.1, HORTON, Brian K.2, LOVERA, Oscar M.1, GROVE, Marty1, FARLEY, Kenneth A.3, KIMBROUGH, David L., and MCNULTY, Brendan4, (1) Dept. of Earth and Space Sciences, Univ. of California, Los Angeles, CA 90095-1567, lovera@ucla.edu, (2) Department of Earth and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive East, Box 951567, Los Angeles, CA 90095-1567, (3) Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, (4) Department of Earth Sciences, California State Univ Dominguez Hills, 1000 East Victoria Street, Carson, CA 90747
3-1851NEWLY MAPPED PALEOZOIC STRATIGRAPHIC UNITS IN THE HUANUCO REGION OF CENTRAL PERU; TECTONIC IMPLICATIONS FOR THE MARAÑON FOLD-THRUST BELT: SCHERRENBERG, Arne F., School of Physical Sciences - Earth Sciences, University of Queensland, Brisbane, QLD 4072, Australia, a.scherrenberg@uq.edu.au and JACAY, Javier, Escuela de Ingeniería Geológica, Universidad Nacional Mayor de San Marcos, Aportado postal 3973, Lima, 100, Peru
3-1952THE ROLE OF THE JUAN FERNANDEZ RIDGE IN THE TECTONIC EVOLUTION OF THE CENTRAL CHILEAN ANDES (33°S): CREIXELL, Christian Erwin1, ARRIAGADA, César2, MORATA, Diego1, PARADA, Miguel Angel1, and ROPERCH, Pierrick3, (1) Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, 13518-21, Chile, ccreixel@ing.uchile.cl, (2) Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile, (3) IRD, Geosciences Rennes 3452, France
3-2053MIOCENE FOREBULGE DEVELOPMENT PREVIOUS TO THE BROKEN FORELAND PARTITIONING IN THE SIERRAS PAMPEANAS (ARGENTINA), SOUTHERN CENTRAL ANDES: DÁVILA, Federico M. and ASTINI, Ricardo A., Laboratorio de Análisis de Cuencas-Cátedra de Estratigrafía y Geología Histórica, FCEFyN - Universidad Nacional de Córdoba, Av. Velez Sarsfield 1611, Ciudad Universitaria-Edificio Geología, Córdoba, 5016, Argentina, fmdavila@efn.uncor.edu
3-2154EARLY MIDDLE MIOCENE FLEXURAL UPLIFTING AND FOREBULGE MIGRATION IN THE CENTRAL ANDEAN FORELAND BASIN OF ARGENTINA: RODRÍGUEZ BRIZUELA, Rafael, Paleopalinología, Museo Argentino de Ciencias Naturales, Ángel Gallardo 470, Buenos Aires 1405 Argentina, rrbrizuela@macn.gov.ar
3-2255POLYPHASE STRUCTURAL EVOLUTION RELATED TO A MAJOR DISCONTINUITY IN THE ANDEAN FORELAND: THE VALLE FÉRTIL FAULT SYSTEM: ORTS, Sergio, Río Tinto Mining, Rivadavia 902, Godoy Cruz, Mendoza, 5501, Argentina, Sergio.Orts@riotinto.com, MCCLELLAND, William C., Geological Sciences, University of Idaho, Moscow, ID 83844-3022, and VUJOVICH, Graciela I., Laboratorio de Tectónica Andina, FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, Buenos Aires, 1428, Argentina
3-2356THE PHANEROZOIC GEOLOGIC RECORD ALONG THE CRESTAL CHILEAN ANDES ABOVE THE FLAT SUBDUCTING SLAB BASED ON 1:50,000 SCALE MAPPING BY SERNAGEOMIN: MARTIN, Mark W., SERNAGEOMIN (presently with Shell International Exploration and Production), 200 N. Dairy Ashford, Houston, TX 77079, mark.w.martin@shell.com, CLAVERO RIBES, Jorge, SERNAGEOMIN, Avda. Santa Maria 0104, Santiago, Chile, and MPODOZIS, Constantino, SERNAGEOMIN (presently with SIPETROL SA), Vitacura 2736, Santiago, Chile
3-2457LATERAL EXPANSION OF THE MIOCENE VOLCANIC FRONT OVER THE PAMPEAN FLAT SLAB SEGMENT, SOUTHERN CENTRAL ANDES: LITVAK, Vanesa D. and POMA, Stella, Department of Geological Sciences, University of Buenos Aires, Ciudad Universitaria - Pabellón II, Buenos Aires, 1428, Argentina, vane@gl.fcen.uba.ar
3-2558SUBDUCTION EROSION AND CRUSTAL THICKENING IN LA RAMADA REGION, CORDILLERA PRINCIPAL AND FRONTAL (32°30'LS): PÉREZ, Daniel J., Laboratorio de Tectónica Andina, Dpto. Geología, FCEN, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, Buenos Aires 1428 Argentina, daniel@gl.fcen.uba.ar
3-2659SEISMIC VELOCITIES AND CRUSTAL STRUCTURE IN THE FLAT SLAB REGION OF CHILE AND ARGENTINA AS REVEALED BY LOCAL RECEIVER FUNCTIONS AND SURFACE WAVE DISPERSION: CALKINS, Josh1, ZANDT, George2, BECK, Susan L.2, and GILBERT, Hersh2, (1) Department of Geosciences, Univ. of Arizona, Gould-Simpson Building #77, 1040 E 4th St, Tucson, AZ 85721-0077, jcalkins@geo.arizona.edu, (2) Department of Geosciences, University of Arizona, Gould-Simpson Bldg, Tucson, AZ 85721-0077
3-2760RELATIONSHIPS BETWEEN TECTONIC SHORTENING AND SLAB SHALLOWING: CHILEAN-ARGENTINE ANDES (25°-35°S): ALVAREZ, P. Pamela, Exploration, SIPETROL, Av. Vitacura 2736, 8° piso Las Condes, Santiago, 6760197, Chile, palvarez@sipetrol.cl, MPODOZIS, Constantino, Sipetrol S.A, Vitacura 2736, Santiago, Chile, GIAMBIAGI, Laura B., CONICET-IANIGLA Centro Regional de Investigaciones Científicas y Tecnológicas, CONICET, Parque San Martín s/n, 5500, Mendoza, 5500, Argentina, GODOY, Estanislao, Regional Geology, Servicio Nacional de Geologia y Minería, Av. Santa Maria 0104, Providencia, Santiago, 6760197, Chile, and RADIC, Juan Pablo, Exploration, SIPETROL, Av. Vitacura 2736, 8°piso, Las Condes, Santiago, 6760197, Chile
3-2861ACCURATE DEPTHS OF CENTRAL ANDEAN CRUSTAL EARTHQUAKES: RELATIONSHIP TO TOPOGRAPHY AND DEFORMATIONAL STRUCTURES ABOVE FLAT SLAB SUBDUCTION: DEVLIN, Stephanie, Department of Earth & Atmospheric Sciences, Cornell University, 2112 Snee Hall, Ithaca, NY 14853-1504, sd248@cornell.edu and ISACKS, Bryan L., Department of Earth and Atmospheric Sciences, Cornell University, Snee Hall, Ithaca, NY 14853
3-2962TIMING AND STYLE OF DEFORMATION OF THE ANDES ABOVE THE NORMAL SUBDUCTION SEGMENT, 34º-35º S, SOUTHERN CENTRAL ANDES: COMPARISON WITH THE FLAT SLAB (32º-33º S) AND TRANSITION (33º-34º S) SEGMENTS: GIAMBIAGI, Laura B.1, BECHIS, Florencia1, and GARCÍA, Víctor H.2, (1) IANIGLA-CRICYT, CONICET, Parque San Martín s/n, Mendoza, 5500, Argentina, lgiambia@lab.cricyt.edu.ar, (2) LAMOGE, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, Buenos Aires, 1428
3-3063INFLUENCE OF FLAT-SLAB SUBDUCTION ON THE EVOLUTION OF THE EL TENIENTE CU DEPOSIT, CHILE: FUNK, Jonathan1, STERN, Charles R.1, SKEWES, Alexandra1, and ARÉVALO, Alejandra2, (1) Dept of Geological Sciences, University of Colorado, Boulder, CO 80309-0399, jonathan.funk@colorado.edu, (2) Superintendencia Geología, El Teniente, CODELCO-Chile, Millán 1040, Rancagua, Chile
3-3164PALEOMAGNETISM AND MAGNETIC MINERALOGY IN EL TENIENTE SUPERGIANT PORPHYRY CU-MO DEPOSIT, CENTRAL ANDES, CHILE: ASTUDILLO, N.1, ROPERCH, P.2, TOWNLEY, B.1, and ARRIAGADA, César1, (1) Departamento de Geologia, Universidad de Chile, Plaza Ercilla 803, Santiago, 8320000, Chile, nastudil@cec.uchile.cl, (2) IRD, Geosciences Rennes, Rennes, 35542, France
3-3265MAGMATISM AND THE SHALLOWING AND STEEPENING OF THE NAZCA PLATE UNDER THE CENTRAL ANDES FROM 28°S TO 37°S LATITUDE: KAY, Suzanne Mahlburg, Geological Sciences, Cornell Univ, Snee Hall, Ithaca, NY 14853-1504, smk16@cornell.edu
3-3366PLIO-PLEISTOCENE EASTWARD MIGRATION OF THE ARC FRONT IN SOUTHERN ANDES (33-35ºS): TECTONIC REGIMES AND VOLCANISM SOUTH OF THE PAMPEAN FLAT-SLAB SEGMENT: LARA, Luis E., Geología Aplicada, SERNAGEOMIN, Av. Santa María 0104, Santiago, Chile, Santiago, 10465, Chile, lelara@sernageomin.cl, LAVENU, Alain, LMTG- IRD-UMR 5563, IRD, 14 Avenue Edouard Belin, 31400 Toulouse, France, Toulouse, 1, France, and STERN, Charles R., Dept of Geological Sciences, University of Colorado, Boulder, CO 80309-0399
3-3467THE HUINCAN ERUPTIVE CYCLE, SOUTHERN MENDOZA, ARGENTINA: AN EXAMPLE OF ANDESITIC FRONT-ARC-LIKE MIOCENE VOLCANISM IN THE BACK-ARC OF THE SOUTHERN VOLCANIC ZONE: NULLO, Francisco E., Departamento de Geologia - Conicet, Universidad de Buenos Aires, Pabellon 2, Buenos Aires, 1242, Argentina, nullo@newphoenixsrl.com, OTAMENDI, Juan, Departamento de Geologia - Conicet, Universidad Nacional de Río Cuarto, Ciudad Universitaria, Río Cuarto, 5400, Argentina, BALDAUF, Paul E., College of Undergraduate Studies, The Union Institute, Venture Center, Suite 102, Northe Miami, FL 33612-1746, and STEPHENS, George, Geological Department, The George Washington University, 2121 Eye St, N.N, Washington D.C, VA 20052, geoice@gwu.edu
3-3568COPPER METALLOGENESIS IN CHILE FROM RE-OS ISOTOPES: RUIZ, Joaquin, Dean, College of Science, Univ of Arizona, PO BOX 210077, Tucson, AZ 85721, jruiz@u.arizona.edu

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