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Elements; January 2005; v. 1; no. 1; p. 31-37; DOI: 10.2113/gselements.1.1.31
© 2005 Mineralogical Society of America
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Fluids, Faulting, and Flow

Harry W. Green, II1,2 and Haemyeong Jung1

1 Institute of Geophysics and Planetary Physics, University of California, Riverside, CA 92521, USA
2 Department of Earth Sciences, University of California, Riverside, CA 92521, USA
E-mail: harry.green{at}ucr.edu

Geological fluids affect deformation of rocks both physically and chemically. The presence of fluids can lead to faulting (earthquakes) or enhance flow, depending on the level of stress. At higher stresses, fluids with a density less than their host generate Mode I microcracks, whereas fluids with a density greater than their host generate Mode I microanticracks; both can self-organize and cause faulting. At lower stresses, fluids segregate to grain boundaries at small strains and, at large strains, fluid-enriched zones develop that experience a higher strain rate than the bulk. Dissolved H2O enhances flow (e.g., by water-weakening). Consequences include earthquakes, differentiation, melt separation/volcanism, and seismic anisotropy.

KEYWORDS: fracture, earthquake, anticrack, water-weakening, lattice-preferred-orientation (LPO), seismic anisotropy, differentiation




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