Session: Tectonics, Structure, and Geophysics of the Gulf of California–Salton Trough Region (Posters) (Cordilleran Section

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1

LA 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, (2)UMR 6538, Domaines Océaniques, UBO/IUEM-CNRS, 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, aaguillonr@uaslp.mx, aaguillonr@uaslp.mx

2

TECTONIC 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, 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, ledesma@uabc.mx, ledesma@uabc.mx

3

MAGNESIAN 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, (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, UBO/IUEM-CNRS, 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, tcalmus@servidor.unam.mx, tcalmus@servidor.unam.mx

4

SEGMENTATION 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, jfletche@cicese.mx

5

VOLUMINOUS 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, (2)Instituto de Geologia, Universidad Nacional Autonoma de Mexico, Estacion Regional del Noroeste, UNAM, Apartado Postal 1039, Hermosillo, 83000, Mexico, ian_macmillan@umail.ucsb.edu, ian_macmillan@umail.ucsb.edu

6

NEW 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, (2)Dept. of Geological Sciences, 1272 University of Oregon, Eugene, OR 97403-1272, sjanecke@cc.usu.edu, sjanecke@cc.usu.edu

7

TECTONIC 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 and ELDERS, Wilfred A., Institute of Geophysics & Planetary Physics, Univ of California, Riverside, CA 92521, jmespinos@cicese.mx, jmespinos@cicese.mx

8

MARINE 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, (2)Geologia, CICESE, Km 107 Carretera Tijuana-Ensenada, Ensenada, B.C, 28060, Mexico, jstock@gps.caltech.edu, jstock@gps.caltech.edu

9

EARTHQUAKE 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, (2)Department of Geological Sciences, San Diego State Univ, San Diego, CA 92182-1020, dragona@ucsd.edu, dragona@ucsd.edu

10

EVOLUTION OF SEDIMENTARY ENVIRONMENTS ON THE DELTA OF THE COLORADO RIVER

ELDERS, Wilfred A., Institute of Geophysics & Planetary Physics, Univ of California, Riverside, CA 92521, MARTIN-BARAJAS, Arturo, Departamento de Geologia, CICESE, Ensenada, BC, Mexico and PACHECO, Martin, Departamento de Geofisica Applicada, CICESE, Ensenda, BC, Mexico, wilfred.elders@ucr.edu, wilfred.elders@ucr.edu

11

MAPPING, 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 Jr, James C.³, 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, (2)Department of Geology, Northern Arizona Univ, Flagstaff, AZ 86011, (3)Department of Geological & Environmental Sciences, Stanford Univ, Stanford, CA 94305, ruiz_geraldo@hotmail.com, ruiz_geraldo@hotmail.com

12

JURASSIC 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, (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, plataelvia@hotmail.com, plataelvia@hotmail.com

13

STRATIGRAPHY 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, kblair@umail.ucsb.edu

Cordilleran Section - 99th Annual (April 1–3, 2003)

S1. Tectonics, Structure, and Geophysics of the Gulf of California–Salton Trough Region (Posters)