Session No. 16 Wednesday, April 2, 2003

8:30 AM-5:30 PM, Hotel NH Krystal: La Capilla
S1. Tectonics, Structure, and Geophysics of the Gulf of California–Salton Trough Region (Posters)
 Paper #Booth #
16-11LA PURISIMA VOLCANIC FIELD, BAJA CALIFORNIA SUR, MEXICO: MAGMATIC EVOLUTION FROM MIOCENE TO QUATERNARY: AGUILLÓN-ROBLES, Alfredo1, BELLON, Hervé2, CALMUS, Thierry3, MAURY, René C.4, BOURGOIS, Jacques5, and COTTEN, Joseph2, (1) Instituto de Geología, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava no. 5, San Luis Potosí, 78240, Mexico, aaguillonr@uaslp.mx, (2) UMR 6538, Domaines Océaniques, IUEM, Université de Bretagne Occidentale, 6, Av. Le Gorgeu, Brest, 29285, France, (3) Instituto de Geología, ERNO, Universidad Nacional Autónoma de México, Hermosillo, 83000, Mexico, (4) UMR 6538, Domaines Océaniques, IUEM, Université de Bretagne Occidentale, Place Nicolas Copernic, Plouzané, 29280, France, (5) IRD and CNRS Unité Mixte de Recherche "Géosciences Azur" 6526, Petroproducción-Centro de Investigaciones Geológicas, km 6.5 vía a la costa, Guayaquil, 09-03-30096, Ecuador
16-22TECTONIC STAGE IDENTIFICATION VIA GEOPHYSICAL AND GEOLOGICAL SURVEY, SOUTHERN PART OF THE MIOCENE-PLIOCENE EL BOLEO BASIN, BAJA CALIFORNIA SUR: LEDESMA-VÁZQUEZ, Jorge, Facultad de Ciencias Marinas, Universidad Autonoma de Baja Calif, Ensenada, Baja Calif, 22800, Mexico, ledesma@uabc.mx, ESPINOSA-CARDEÑA, Juan M., Departamento de Ciencias de la Tierra, CICESE, Km 107 Carrtera Tijuana-Ensenada, Ensenada, Baja California, 22860, Mexico, CUPUL-MAGAÑA, Luis A., Facultad de Ciencias Marinas, Universidad Autonoma de Baja Calififornia, Ensenada, Baja Calif, 22800, Mexico, and ESCANDÓN-ARMENDÁRIZ, Francisco, COREMI, Blvd. Felipe Angeles s/n, Carretera México - Pachuca Km 93.5, Pachuca, Hgo, 42080, Mexico
16-33MAGNESIAN ANDESITES FROM BAJA CALIFORNIA, MEXICO: THE ROLE OF SLAB MELTS: CALMUS, Thierry1, MAURY, René2, AGUILLÓN-ROBLES, Alfredo3, BELLON, Hervé4, BENOIT, Mathieu2, COTTEN, Joseph4, BOURGOIS, Jacques5, and MICHAUD, François6, (1) Instituto de Geología, ERNO, Universidad Nacional Autónoma de México, PO Box 1039, Hermosillo, 83000, Mexico, tcalmus@servidor.unam.mx, (2) UMR 6538, Domaines Océaniques, IUEM, Université de Bretagne Occidentale, Place Nicolas Copernic, Plouzané, 29280, France, (3) Instituto de Geología, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava no. 5, San Luis Potosí, 78240, Mexico, (4) UMR 6538, Domaines Océaniques, IUEM, Université de Bretagne Occidentale, 6, Av. Le Gorgeu, Brest, 29285, France, (5) Institut pour la Recherche et le Développement, Petroproducción, km 6.5. via a la Costa, Guayaquil, Ecuador, (6) UMR 6526, Géosciences Azur, Université Pierre et Marie Curie, La Darse, BP 48, Villefranche-sur-Mer, 06230, France
16-44SEGMENTATION AND KINEMATICS OF PLATE-MARGIN FAULT SYSTEMS IN THE SOUTHERN GULF OF CALIFORNIA: FLETCHER, John M., CICESE, PO Box 434843, San Diego, CA 92143-4843, jfletche@cicese.mx.
16-55VOLUMINOUS MID-MIOCENE SILICIC VOLCANISM AND RAPID EXTENSION IN THE SIERRA LIBRE, SONORA, MEXICO: MACMILLAN, Ian1, GANS, Phillip1, and ROLDAN, Jaime2, (1) Geology, Univ of California, Santa Barbara, CA 93106, ian_macmillan@umail.ucsb.edu, (2) Instituto de Geologia, Universidad Nacional Autonoma de Mexico, Estacion Regional del Noroeste, UNAM, Apartado Postal 1039, Hermosillo, 83000, Mexico
16-66NEW STRAND OF THE SAN JACINTO FAULT ZONE SW OF THE SALTON SEA AND A POSSIBLE CONTRACTIONAL STEP-OVER IN THE SAN FELIPE HILLS: A MODEL TO BE TESTED: JANECKE, Susanne U.1, KIRBY, Stefan M.1, and DORSEY, Rebecca J.2, (1) Dept. of Geology, Utah State Univ, Logan, UT 84322-4505, sjanecke@cc.usu.edu, (2) Dept. of Geological Sciences, 1272 University of Oregon, Eugene, OR 97403-1272
16-77TECTONIC IMPLICATIONS OF GRAVITY ANOMALIES IN THE NORTHERN GULF OF CALIFORNIA AND SALTON TROUGH RIFT SYSTEMS: ESPINOSA-CARDEÑA, Juan M., Departamento de Geofisica Aplicada, CICESE, Apdo. Postal 2732, Ensenda, 22830 BC, Mexico, jmespinos@cicese.mx and ELDERS, Wilfred A., Institute of Geophysics & Planetary Physics, Univ of California, Riverside, CA 92521
16-88MARINE GEOPHYSICAL TRANSECT OF THE CONTINENTAL BORDERLAND AND ADJACENT PACIFIC SEAFLOOR, CALIFORNIA AND MEXICO: STOCK, Joann M.1, ARAGON-ARREOLA, Manuel2, and CLAYTON, Robert1, (1) Seismological Laboratory, California Institute of Technology, Caltech 252-21, Pasadena, CA 91125, jstock@gps.caltech.edu, (2) Geologia, CICESE, Km 107 Carretera Tijuana-Ensenada, Ensenada, B.C, 28060, Mexico
16-99EARTHQUAKE BEHAVIOR ACROSS A FAULT SEGMENT BOUNDARY: A HIGH RESOLUTION PALEOSEISMIC STUDY IN THE SOUTHERN SAN JACINTO FAULT ZONE, IMPERIAL VALLEY, SOUTHERN CALIFORNIA: RAGONA, Daniel1, ROCKWELL, Thomas K.2, and ALTANGEREL, Orgil2, (1) IGPP, Scripps Institute of Oceanography, University of California, La Jolla, CA 92093, dragona@ucsd.edu, (2) Department of Geological Sciences, San Diego State Univ, San Diego, CA 92182-1020
16-1010EVOLUTION OF SEDIMENTARY ENVIRONMENTS ON THE DELTA OF THE COLORADO RIVER: ELDERS, Wilfred A., Institute of Geophysics & Planetary Physics, Univ of California, Riverside, CA 92521, wilfred.elders@ucr.edu, MARTIN-BARAJAS, Arturo, Departamento de Geologia, CICESE, Ensenada, BC, Mexico, and PACHECO, Martin, Departamento de Geofisica Applicada, CICESE, Ensenda, BC, Mexico
16-1111MAPPING, STRATIGRAPHY, AND DEPOSITIONAL ENVIRONMENT OF THE PLIOCENE PUNTA COLORADA BASIN, SAN JOSÉ ISLAND, GULF OF CALIFORNIA, MEXICO: RUIZ-GERALDO, Gabriela1, SCHWENNICKE, Tobias1, UMHOEFER, Paul J.2, INGLE, James C. Jr3, THOMPSON, Rebecca2, and DEL MARGO, Maya2, (1) Departamento de Geología Marina, Universidad Autónoma de Baja California Sur, Apdo Postal 19-B, La Paz, 23080, Mexico, ruiz_geraldo@hotmail.com, (2) Department of Geology, Northern Arizona Univ, Flagstaff, AZ 86011, (3) Department of Geological & Environmental Sciences, Stanford Univ, Stanford, CA 94305
16-1212JURASSIC SEDIMENTARY ROCKS IN EAST-CENTRAL BAJA CALIFORNIA SUR: THE LOS PARGOS FORMATION: PLATA-HERNÁNDEZ, Elvia1, SCHWENNICKE, Tobias2, HERNÁNDEZ-BERNAL, Patricia3, and DIAZ-PUEBLA, Arnulfo3, (1) Geología Marina, Universidad Autónoma de Baja California Sur, Apdo Postal 19-B, La Paz, 23080, Mexico, plataelvia@hotmail.com, (2) Departamento de Geología Marina, Universidad Autónoma de Baja California Sur, Apdo Postal 19-B, La Paz, 23080, Mexico, (3) Subgerencia de Operación geológica, Petróleos Mexicanos, Edif. 3, Centro Técnico Admvo. PEMEX, Campo Sitio Grande 2000, Fracc. Carrizal, Villahermosa, 86035, Mexico
16-1313STRATIGRAPHY OF THE SAHUARIPA BASIN AND PRELIMINARY COMPARISON TO THE RIO YAQUI BASIN, EAST-CENTRAL SONORA, MEXICO: BLAIR, Karen and GANS, Phillip B., Geological Sciences, UC Santa Barbara, Room 1006, Webb Hall, Santa Barbara, CA 93106, kblair@umail.ucsb.edu

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