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Diffusion & Pressure solution slides

Diffusion & Pressure solution slides. Pressure solution (diffusion flow) in sandstone…. Pressure solution (diffusion flow) in sandstone…. Pressure Solution: cleavage (~ horizontal) cutting lithological layering. Image from Greg Davis’ structure resources DVD.

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Diffusion & Pressure solution slides

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  1. Diffusion & Pressure solution slides

  2. Pressure solution (diffusion flow) in sandstone…

  3. Pressure solution (diffusion flow) in sandstone…

  4. Pressure Solution: cleavage (~ horizontal) cutting lithological layering

  5. Image from Greg Davis’ structure resources DVD

  6. Stylolites: seams of insoluble material left behind at localized sites of pressure solution Image from Greg Davis’ structure resources DVD

  7. At high T, crenulation cleavage develops in slates & schists by pressure solution Image from Greg Davis’ structure resources DVD

  8. Accretionary complexes show volume losses of 30-40% by p.s. at low stresses and temperatures of 200-400°C 1 1e.g. Ring et al, 2001; Schwarz and Stockhert, 1996

  9. Pressure solution cleavage (top R to bottom middle) cutting horizontal bedding in a sandstone

  10. Undeformed Black Hills Sandstone (BHQ), cross polars ~50 microns

  11. BHQ (fast strain rate, 10^-4 /s), note strong lattice distortion, tiny rxl grains ~50 microns

  12. BHQ, Low strain rate (10^-6), power law flow, note large rxl grains, subgrains ~50 microns

  13. BHQ, same sample, gypsum plate inserted, color dominance indicates LPO ~50 microns

  14. BHQ, undeformed, cross polars, gypsum plate inserted (No LPO) ~200 microns

  15. BHQ (fast strain rate, 10^-4 /s), note strong lattice distortion, tiny rxl grains ~50 microns

  16. BHQ, very low strain rate overprint of high strain rate fabric (strain energy now low) ~50 microns

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