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Diffusive-mass-transfer processes and structures

Diffusive-mass-transfer processes and structures. 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.

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Diffusive-mass-transfer processes and structures

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  1. Diffusive-mass-transfer processes and structures

  2. Dissolution-precipitation creep a.k.a. wet diffusion creep Material dissolved at high-stress areas and precipitated in low-stress areas Precipitation Dissolution

  3. 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

  4. 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

  5. Evidence for wet diffusion creep • Pressure-solution seams and cleavages

  6. Evidence for wet diffusion creep • Precipitation sites—Pressure-shadow overgrowths

  7. Evidence for wet diffusion creep • Precipitation sites—Pressure-shadow overgrowths

  8. Evidence for wet diffusion creep • Precipitation sites—Veins

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