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This review examines the principles and evidence of wet diffusion creep, characterized by dissolution and precipitation processes under varying stress conditions. Key factors promoting this phenomenon include significant chemical potential gradients, small grain sizes, and high fluid activity. The study highlights the role of temperature in diffusion rates and discusses the viscosity behavior under approximately linear-viscous rheology. Notable evidence includes observation of pressure-solution seams, cleavages, and pressure-shadow overgrowths. Insights from this process enhance our understanding of geological and material behaviors under specific conditions.
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Dissolution-precipitation creep a.k.a. wet diffusion creep Material dissolved at high-stress areas and precipitated in low-stress areas Precipitation Dissolution
Review of wet diffusion creep • Favored by a large chemical-potential gradient • Probably diffusion limited.... Diffusion dependent on temperature • Approximately linear-viscous rheology with viscosity proportional to 1/d3
Factors favoring wet diffusion creep • Large chemical-potential gradient • Small grain size, short distance for dissolved ions to travel • High fluid activity • Soluble minerals • Low confining pressures and/or fracture porosity • Low differential stress
Evidence for wet diffusion creep • Pressure-solution seams and cleavages
Evidence for wet diffusion creep • Precipitation sites—Pressure-shadow overgrowths
Evidence for wet diffusion creep • Precipitation sites—Pressure-shadow overgrowths
Evidence for wet diffusion creep • Precipitation sites—Veins
