Mantle fluids in the San Andreas fault system, California
- Lawrence Berkeley National Lab., CA (United States)
- Geological Survey, Menlo Park, CA (United States); and others
Fluids associated with the San Andreas and companion faults in central and south-central California have high {sup 3}He/{sup 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. 31 refs., 4 figs.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 569458
- Journal Information:
- Science, Vol. 278, Issue 5341; Other Information: PBD: 14 Nov 1997
- Country of Publication:
- United States
- Language:
- English
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Wed Dec 15 00:00:00 EST 2010
· Chemical Geology
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OSTI ID:569458
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Near-field stress and pore pressure observations along the Carrizo Plain segment of the San Andreas fault in California
Conference
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Mon Jan 01 00:00:00 EST 1996
· AAPG Bulletin
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OSTI ID:569458
Near-field stress and pore pressure observations along the Carrizo Plain segment of the San Andreas fault in California
Conference
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Tue Dec 31 00:00:00 EST 1996
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OSTI ID:569458