Mineralogical characterization of protolith and fault rocks from the SAFOD Main Hole

Details Mineralogical characterization of protolith and fault rocks from the SAFOD Main Hole Mineralogical characterization of protolith and fault rocks from the SAFOD Main Hole

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3321314s&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 21, CiteID L21314

Physics

20

Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction, Physical Properties Of Rocks: Transport Properties, Structural Geology: Fractures And Faults, Structural Geology: Rheology: Crust And Lithosphere (8159), Tectonophysics: Rheology And Friction Of Fault Zones (8034)

Scientific paper

Washed cuttings provide a continuous record of the rocks encountered during drilling of the main hole of the San Andreas Fault Observatory at Depth (SAFOD). Both protolith and fault rocks exhibit a wide variety of mineral assemblages that reflect variations in some combination of lithology, P-T conditions, deformation mechanisms, and fluid composition and abundance. Regions of distinct neomineralization bounded by faults may record alteration associated with fluid reservoirs confined by faults. In addition, both smectites occurring as mixed-layer phases and serpentine minerals are found in association with active strands of the San Andreas Fault that were intersected during drilling, although their rheological influence is not yet fully known. Faults containing these mineralogical phases are prime candidates for continuous coring during Phase 3 of SAFOD drilling in the summer of 2007.

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