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Vacancy. Interstitial Atom. Initial Shape. Final Shape. Strain Ellipse. Coble creep and pressure solution diffusion. Nebarro-Herring diffusion. Redistributed Material. Strain Ellipse. Coaxial Deformation. Fracture and Cataclasis. Dislocation Creep. Differential Stress.
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Vacancy Interstitial Atom
Initial Shape Final Shape Strain Ellipse
Coble creep and pressure solution diffusion Nebarro-Herring diffusion
Redistributed Material Strain Ellipse Coaxial Deformation
Fracture and Cataclasis Dislocation Creep Differential Stress Dissolution Creep and Mechanical Twinning Grain boundary diffusion creep Volume- diffusion Creep Temperature
Rheology • Rheology - relationship between stress and strain • Elastic: Hooke’s Law (stress is proportional to strain) • Frictional: Byerlee’s Law • Viscous:
Creep • Creep = slow viscous flow that occurs at differential stresses well below the rupture strength of the rock
Non-linear viscous • edot = A s^n exp (-E*/RT), rearranged ass= ((edot)/A)1/n exp (-E*/RT)
Calcite Dislocation glide Dislocation creep Coble Creep Pressure Solution Nebarro-Herring Creep Temperature
Quartz Dissolution Glide Dissolution Creep Pressure Solution Nebarro-Herring Creep Temperature