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- W2045772367 abstract "Mineral‐water interactions under conditions of nonhydrostatic stress play a role in subjects as diverse as ductile creep in fault zones, phase relations in metamorphic rocks, mass redistribution and replacement reactions during diagenesis, and loss of porosity in deep sedimentary basins. As a step toward understanding the fundamental geochemical processes involved, using naturally rounded St. Peter sand, we have investigated the kinetics of pore volume loss and quartz‐water reactions under nonhydrostatic, hydrothermal conditions in flow‐through reactors. Rate laws for creep and mineral‐water reaction are derived from the time rate of change of pore volume, sand‐water dissolution kinetics, and (flow rate independent) steady state silica concentrations, and reveal functional dependencies of rates on grain size, volume strain, temperature, effective pressure (confining minus pore pressure), and specific surface areas. Together the mechanical and chemical rate laws form a self‐consistent model for coupled deformation and water‐rock interaction of porous sands under nonhydrostatic conditions. Microstructural evidence shows a progressive widening of nominally circular and nominally flat grain‐grain contacts with increasing strain or, equivalently, porosity loss, and small quartz overgrowths occurring at grain contact peripheries. The mechanical and chemical data suggest that the dominant creep mechanism is due to removal of mass from grain contacts (termed pressure solution or solution transfer), with a lesser component of time‐dependent crack growth and healing. The magnitude of a stress‐dependent concentration increase is too large to be accounted for by elastic or dislocation strain energy‐induced supersaturations, favoring instead the normal stress dependence of molar Gibbs free energy associated with grain‐grain interfaces." @default.
- W2045772367 created "2016-06-24" @default.
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- W2045772367 date "1995-07-10" @default.
- W2045772367 modified "2023-10-13" @default.
- W2045772367 title "Rate laws for water‐assisted compaction and stress‐induced water‐rock interaction in sandstones" @default.
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- W2045772367 doi "https://doi.org/10.1029/95jb00912" @default.
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