Mantle Fluids in the San Andreas Fault System, California

Author:

Kennedy B. M.123,Kharaka Y. K.123,Evans W. C.123,Ellwood A.123,DePaolo D. J.123,Thordsen J.123,Ambats G.123,Mariner R. H.123

Affiliation:

1. B. M. Kennedy, Center for Isotope Geochemistry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

2. Y. K. Kharaka, W. C. Evans, J. Thordsen, G. Ambats, R. H. Mariner, Water Resources Division, U.S. Geological Survey, Menlo Park, CA 94025, USA.

3. A. Ellwood and D. J. DePaolo, Center for Isotope Geochemistry, Geology and Geophysics Department, University of California, and Lawrence Berkeley National Laboratory, Berkeley, CA 94720–4767, USA.

Abstract

Fluids associated with the San Andreas and companion faults in central and south-central California have high 3 He/ 4 He ratios. The lack of correlation between helium isotopes and fluid chemistry or local geology requires that fluids enter the fault system from the mantle. Mantle fluids passing through the ductile lower crust must enter the brittle fault zone at or near lithostatic pressures; estimates of fluid flux based on helium isotopes suggest that they may thus contribute directly to fault-weakening high-fluid pressures at seismogenic depths.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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