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- W2064752023 abstract "Optical, TEM and SEM observations were made on gouge from orthoquartzite subjected to sliding friction experiments (Hayes, 1975; Dunn and Hayes, 1975) at a constant effective confining pressure of 500 bars and a strain rate of 2.5 · 10−5 s−1, both dry and in the presence of pore fluids. All experiments exhibited stick-slip behavior, and brittle fracture of both surface asperities and the gouge is the dominant deformation mechanism. Crystalline, smooth filamentous projections on larger fragments and individual filaments found throughout the gouge indicate that ductile flow is occurring at the tips of surface asperities. Welded gouge and a small amount of glass are found in the dry samples. The presence of a fluid inhibits the formation of welded gouge and glass but promotes the production of angular fragments by causing them to move past one another instead of clumping. The gouge showed a 99.7% reduction in the average grain size for all experimental conditions indicating that mechanical abrasion is highly effective even with 2.5–5.9 mm axial displacements. The experimental results can aid our understanding of the formation of gouge and fractures during faulting and the stabilization of fault movements to prevent earthquakes. The experimentally-produced gouge is analogous to cataclastic rocks lacking primary cohesion which are produced during near-surface brittle fracturing. Observations of experimental and natural faults suggest that fracturing along the sliding surface increases with increased displacement. Fault stabilization is enhanced by the presence of a fluid which lowers the coefficient of sliding friction and which completely wets the gouge produced during the movement." @default.
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- W2064752023 date "1980-02-01" @default.
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- W2064752023 title "Microscopic characteristics of orthoquartzite from sliding friction experiments. II. Gouge" @default.
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- W2064752023 doi "https://doi.org/10.1016/0040-1951(80)90198-5" @default.
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