Geochemistry and hydromechanical interactions of fluids associated with the San Andreas fault system, California
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Abstract
18O values establish that waters are predominantly of meteoric origin. The chemical compositions of water and gases are controlled mainly by the ambient rock types, and chemical geothermometry gives reservoir temperatures of 80-150 degrees C indicating shallow to moderate circulation depths of up to 6 km. However, compositions and isotope abundances of noble gases and delta 13C values of HCO3 indicate a significant (up to 50%) mantle component for the volatiles. The relatively high fluxes of CO2 (C/ 3He nearly equal 10 10) and other volatiles of mantle origin support a deep continuous flow model, especially at depths >6 km. Numerical simulations indicate that these high fluxes of CO2 of mantle and deep crustal origin are sufficient to generate lithostatic fluid pressures, and thus a weakened fault, in time scales comparable to those of earthquake cycles.
Study Area
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Geochemistry and hydromechanical interactions of fluids associated with the San Andreas fault system, California |
| DOI | 10.1029/GM113p0129 |
| Year Published | 1999 |
| Language | English |
| Publisher | American Geophysical Union |
| Publisher location | Washington, D.C. |
| Contributing office(s) | National Research Program - Western Branch |
| Description | 20 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Monograph |
| Larger Work Title | Faults and subsurface fluid flow in the shallow crust |
| First page | 129 |
| Last page | 148 |
| Country | United States |
| State | California |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |