Session No. 29 Wednesday, April 2, 2003

2:15 PM-5:30 PM, Hotel NH Krystal: Mismaloya
T21. Proterozoic Basement in Sonora and Adjacent Areas: A Piece of SW Laurentia I
Alexander Iriondo and Martin Valencia-Moreno, Presiding
 Paper #Start Time
29-12:15 PM RECONNAISSANCE STUDIES OF PROTEROZOIC CRYSTALLINE ROCKS IN SONORA: 1968-1978: A STIMULUS TO NEW IDEAS: ANDERSON, Thomas H., Geology and Planetary Science, Univ of Pittsburgh, 200 SRCC, Pittsburgh, PA 15260, taco@pitt.edu and SILVER, Leon T., California Institute Technology, 1201 E California Blvd MC 100-23, Pasadena, CA 91125-0001
29-22:35 PM U-PB ZIRCON GEOCHRONOLOGY OF PALEOPROTEROZOIC BASEMENT IN NORTHWESTERN SONORA, MEXICO: EVIDENCE FOR AFFINITY TO SW US PROVINCES: PREMO, Wayne R.1, IRIONDO, Alexander1, and NOURSE, Jonathan A.2, (1) U.S. Geol Survey, MS 963, Box 25046, Denver Federal Center, Denver, CO 80225, wpremo@usgs.gov, (2) Department of Geological Sciences, California State Polytechnic Univ, Pomona, CA 91768
29-32:55 PM METAMORPHISM AND OROGENESIS OF PROTEROZOIC ROCKS IN THE SOUTHWESTERN MOJAVE PROVINCE: COLEMAN, Drew S., Department of Geological Sciences, Univ of North Carolina, CB#3315, Chapel Hill, NC 27599, dcoleman@unc.edu, BARTH, Andrew P., Department of Geology, Indiana Univ-Purdue Univ, Indianapolis, Indianapolis, IN 46202, and WOODEN, Joseph L., U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025
29-43:15 PM THE CABORCA BLOCK: AN INHOMOGENEOUS PIECE OF PALEOPROTEROZOIC CRUST IN SONORA: IRIONDO, Alexander, USGS, MS 974, Box 25046, DFC, Denver, CO 80225, iriondo@usgs.gov and PREMO, W.R., USGS, MS 963, Box 25046, DFC, Denver, CO 80225
 3:35 PM Break
29-53:50 PM GNEISSES OF THE NW SONORA-SW ARIZONA BORDER REGION: TWO DISTINCT PALEOPROTEROZOIC COMPLEXES AT THE SOUTHWEST EDGE OF LAURENTIA: NOURSE, Jonathan A.1, PREMO, Wayne R.2, and IRIONDO, Alexander2, (1) Department of Geological Sciences, California State Polytechnic Univ, Pomona, CA 91768, janourse@csupomona.edu, (2) U.S. Geol Survey, MS 963, Box 25046, Denver Federal Center, Denver, CO 80225
29-64:10 PM ISOTOPIC EVIDENCE ON THE NATURE OF PRECAMBRIAN BASEMENT AND OVERLYING SEDIMENTARY ROCKS, CABORCA, SONORA: FARMER, G. Lang1, BOWRING, Samuel A.2, ESPINOZA, Inocente3, and MATZEL, Jennifer P.2, (1) Univ Colorado - Boulder, PO Box 399, Boulder, CO 80309-0399, farmer@cires.colorado.edu, (2) EAPS, MIT, Cambridge, MA 02139, (3) Departamento de Geologia, Universidad de Sonora, Hermosillo, Sonora, 83000, Mexico
29-74:30 PM LOCATION OF THE SOUTHWESTERN EDGE OF PROTEROZOIC NORTH AMERICA BASED ON SR AND ND ISOTOPIC DATA FROM LARAMIDE GRANITIC ROCKS OF SONORA, NW MEXICO: VALENCIA-MORENO, Martín1, RUIZ, Joaquin2, and PATCHETT, Jonathan P.2, (1) Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, L.D. Colosio y Madrid S/N, Hermosillo, 83240, Mexico, valencia@geologia.unam.mx, (2) Department of Geosciences, Univ of Arizona, Gould-Simpson Bldg, Tucson, 85721

Back to the Cordilleran Section - 99th Annual (April 1–3, 2003)
General Information for this Meeting