HR: 1340h
AN: T23C-1542    [Abstracts]
TI: Coupled Basement-Detrital Thermochronology from the southern Gulf of California
AU: * Lovera, O M
EM: lovera@ucla.edu
AF: UCLA, Dept. Earth and Space Sciences, Los Angeles, CA 90095, United States
AU: Grove, M
EM: marty@ess.ucla.edu
AF: UCLA, Dept. Earth and Space Sciences, Los Angeles, CA 90095, United States
AU: Kohn, B
AF: The University of Melbourne, School of Earth Sciences, Parkville, NSW 3052, Australia
AU: Fletcher, J
AF: CICESE, Departamento de Geologia, Ensenada, BC 22860, Mexico
AU: Kimbrough, D
AF: San Diego State University, Department of Geological Sciences, San Diego, CA 92182, United States
AU: Umhoefer, P
AF: Northern Arizona University, Department of Geology, Flagstaff, AZ 86011, United States
AU: Schwennicke, T
AF: UABCS, Departamento de Geologia Marina, La Paz, BC 23080, Mexico
AU: Gleadow, A J
AF: The University of Melbourne, School of Earth Sciences, Parkville, NSW 3052, Australia
AB: We have developed a thermo-kinetic numerical model to simultaneously interpret detrital and basement thermochronology based upon variational methods designed to better constrain the initiation time, slip history, and erosion history of rifted arc crust. The San Jose del Cabo (SJDC) normal fault is a major east-dipping normal fault associated the San Jose del Cabo rift basin and mid- to late Cretaceous arc basement (Los Cabos block). Preliminary results indicate that approximately half of the 10 km total basement denudation is due to Late Miocene-Recent rift-related denudation. Peak exhumation occurred at 7 m.y. at 1 km/m.y. K-feldspar multi- diffusion domain results limit total denudation to approximately 4 km and indicate that virtually all slip along the SJDC fault took place after 10 Ma of similar to the age of the oldest known sediments within the SJDC basin.
DE: 1040 Radiogenic isotope geochemistry
DE: 1140 Thermochronology
DE: 4260 Ocean data assimilation and reanalysis (3225)
DE: 8105 Continental margins: divergent (1212, 8124)
DE: 8109 Continental tectonics: extensional (0905)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting