Session No. 40 Thursday, April 3, 2003

2:15 PM-5:30 PM, Hotel NH Krystal: Mismaloya
T21. Proterozoic Basement in Sonora and Adjacent Areas: A Piece of SW Laurentia II
Alexander Iriondo and Martin Valencia-Moreno, Presiding
 Paper #Start Time
40-12:15 PM EARLY AND MIDDLE PROTEROZOIC CRISTALINE BASEMENT IN SONORA, MEXICO: ALMAZÁN-VÁZQUEZ, Emilio, Departamento de Geología, Universidad de Sonora, Blvd. Luis Encinas y Rosales, Hermosillo, 83000, Mexico, almazan@geologia.uson.mx, RODRÍGUEZ-TORRES, Rafael, Departamento de Geología, Universidad de Sonora, Blvd. Luis Encinas, Hermosillo, 83000, Mexico, and RODRIGUEZ-CASTAÑEDA, Jose Luis, Instituto de Geología, UNAM, Aptdo Postal 1039, Hermosillo, 83000, Mexico
40-22:35 PM THE EL CRESTÓN GRANITE: A NEW CONFIRMED PALEOPROTEROZOIC LOCALITY IN THE OPODEPE AREA, NORTH-CENTRAL SONORA, MEXICO: VALENZUELA-NAVARRO, Luis Carlos, Posgrado en Ciencias dela Tierra, Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, L.D. Colosio y Madrid S/N, Col. Los Arcos, Hermosillo, 83240, Mexico, zurdoluisc@yahoo.com, VALENCIA-MORENO, Martín, Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, L.D. Colosio y Madrid S/N, Hermosillo, 83240, Mexico, IRIONDO, Alexander, USGS, MS 974, Box 25046, DFC, Denver, CO 80225, and PREMO, Wayne R., U.S. Geol Survey, MS 963, Box 25046, Denver Federal Center, Denver, CO 80225
40-32:55 PM SOURCE ROCK AGES AND DEPOSITIONAL AGE OF PROTEROZOIC METASEDIMENTARY ROCKS IN THE BURRO MOUNTAINS, MAZATZAL PROVINCE, SOUTHWEST NEW MEXICO: A COMPARISON OF LA-MC-ICPMS U/PB ZIRCON AGES AND ELECTRON MICROPROBE MONAZITE AGES: SANDERS, Amos1, AMATO, Jeffrey M.1, and GEHRELS, George2, (1) Geological Sciences, New Mexico State Univ, MSC 3AB, P.O. Box 30001, Las Cruces, NM 88003, amsander@nmsu.edu, (2) Department of Geosciences, Univ of Arizona, Tucson, AZ 85721
 3:15 PM Break
40-43:30 PM EARLY AND MID-PROTEROZOIC CRUST OF THE COAHUILA TERRANE PRESERVED IN XENOLITHS AT CASCADA DE BASASEACHIC, SOUTHWESTERN CHIHUAHUA: HOUSH, Todd, Department of Geological Sciences, The Univ of Texas at Austin, Austin, TX 78712, housh@mail.utexas.edu, MCDOWELL, Fred W., Univ Texas - Austin, Dept Geological Sciences, C1140, Austin, TX 78712-1101, CONNELLY, James N., Geological Sciences, Univ of Texas at Austin, Austin, TX 78712, and DUEX, Timoithy W., Department of Geology, Univ of Louisiana at Lafayette, Lafayette, LA 70504
40-53:50 PM AN INVENTORY OF MAFIC AND ULTRAMAFIC ROCKS OF CORDILLERAN PROTEROZOIC BASEMENT(?) IN NORTHERN SONORA, MEXICO: PRELIMINARY RESULTS: RODRIGUEZ-CASTAÑEDA, Jose Luis1, RODRÍGUEZ-TORRES, Rafael2, and ALMAZÁN-VÁZQUEZ, Emilio2, (1) Instituto de Geología, UNAM, Aptdo Postal 1039, Hermosillo, 83000, Mexico, jlrod@servidor.unam.mx, (2) Departamento de Geología, Universidad de Sonora, Rosales y Colosio, Hermosillo, 83000, Mexico
40-64:10 PM THE AIBO-TYPE (~1.1 GA) GRANITIC MAGMATISM IN NW SONORA, MEXICO: FAILED CONTINENTAL RIFTING OF RODINIA?: IRIONDO, Alexander1, MIGGINS, Daniel1, and PREMO, Wayne2, (1) USGS, MS 974, Box 25046, DFC, Denver, CO 80225, dmiggins@usgs.gov, (2) USGS, MS 963, Box 25046, DFC, Denver, CO 80225
40-74:30 PM GEOCHEMISTRY AND SHRIMP U-PB ZIRCON GEOCHRONOLOGY OF ANORTHOSITIC ROCKS AT SIERRA EL TECOLOTE IN THE CABORCA BLOCK, NORTHWESTERN SONORA, MEXICO: ESPINOZA, Inocente1, IRIONDO, Alex2, PREMO, Wayne2, PAZ, Francisco1, and VALENCIA, Martin3, (1) Departamento de Geologia, Universidad de Sonora, Hermosillo, Sonora, 83000, Mexico, espinoza@marina.geologia.uson.mx, (2) USGS, Denver, CO 80225, (3) Instituto de Geologia, UNAM-ERNO, Hermosillo, Sonora, 83000, Mexico

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