Experimental calcite dissolution under stress: Evolution of grain contact microstructure during pressure solution creep

For the first time, nanometer resolution techniques both in situ and ex situ were compared in order to study calcite dissolution under stress. The obtained results enabled identification of the relative importance of pressure solution driven by normal load and free surface dissolution driven by stra...

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Bibliographic Details
Published in:Journal of Geophysical Research 2010-09, Vol.115 (B9), p.n/a
Main Authors: Croizé, Delphine, Renard, François, Bjørlykke, Knut, Dysthe, Dag Kristian
Format: Article
Language:English
Subjects:
Calcite
Contact
Contact stresses
Crystals
Deformation
Dissolution
Dissolved solids
Earth Sciences
Earth, ocean, space
Environmental Sciences
Exact sciences and technology
Free surfaces
Geology
Geophysics
Global Changes
grain boundary
Grains
Materials creep
Materials science
Physical properties
pressure solution
Rocks
Sciences of the Universe
Strain
Strain rate
Stresses
subcritical crack growth
Tectonics
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Summary:For the first time, nanometer resolution techniques both in situ and ex situ were compared in order to study calcite dissolution under stress. The obtained results enabled identification of the relative importance of pressure solution driven by normal load and free surface dissolution driven by strain energy. It is found that pressure solution of calcite crystals at the grain scale occurred by two different mechanisms. Diffusion of the dissolved solid took place either at a rough calcite/indenter interface, or through cracks that propagated from the contact toward the less stressed part of the crystal. It is also found that strain rates are mostly a function of the active process, i.e., pressure solution associated or not with cracks, rather than being influenced by stress variations. Strain rates obtained in this study are in agreement with published data of experimental calcite and carbonate dissolution under stress.
ISSN:0148-0227
2169-9313
2156-2202
2169-9356
DOI:10.1029/2010JB000869