Plastic deformation of silicate garnetsI. High-pressure experiments

Details Plastic deformation of silicate garnetsI. High-pressure experiments Plastic deformation of silicate garnetsI. High-pressure experiments

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pepi..108..305l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 108, Issue 4, p. 305-318.

Physics

8

Scientific paper

Deformation experiments have been carried out on garnet single crystals (Py20 Al73 Sp2 Gr5) under high confining pressure (6.5 GPa) and temperatures in the range 700-1440°C. The high-pressure sample assembly was designed to generate high differential stress. Below 1000°C, the specimens show only evidence of microplasticity associated with microcracking. Above 1000°C, garnet become ductile and the microstructure is characteristic of dislocation creep with significant recovery. The observed glide systems are 1/2<111>{11¯0}, 1/2<111>{112¯}, 1/2<111>{123¯}, <100>{010} and <100>{011} in the whole temperature range. The most stable (and hence less mobile) dislocation lines appear to be the 70° 1/2<111> (i.e., with a large edge component) and edge <100>. Except for some rare <110> dislocations generated at low temperature, most of the dislocations exhibit no visible dissociation. The detailed characterization of the dislocations suggests that they have an extended, non-planar core. This core structure induces a high Peierls friction and is responsible for the brittle behavior of garnets at low temperature. The Peierls regime extends up to high temperature until diffusion takes place and enhances dislocation climb superimposed to glide.

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