Microstructures in beta-Mg(1.8)Fe(0.2)SiO4 experimentally deformed at transition-zone conditions

Details Microstructures in beta-Mg(1.8)Fe(0.2)SiO4 experimentally deformed at transition-zone conditions Microstructures in beta-Mg(1.8)Fe(0.2)SiO4 experimentally deformed at transition-zone conditions

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pepi...86...69s&link_type=abstract

Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 86, no. 1-3, p. 69-83

Physics

21

Crystal Defects, Earth Mantle, Metamorphism (Geology), Microstructure, Olivine, Phase Transformations, Solid Phases, Crystal Structure, Petrography, Polycrystals, Strain Rate, Transmission Electron Microscopy

Scientific paper

The microstructures that develop in experimentally deformed beta-Mg(1.8)Fe(0.2)SiO4 have been investigated by petrographic and transmission electron microscopy to determine the deformation mechanisms that are active under transition-zone conditions. Advances in the application of the multi-anvil apparatus to deformation studies allowed us to deform beta-Mg(1.8)Fe(0.2)SiO4 at pressures of 14 GPa and greater and 1450 C. San Carlos olivine was transformed to β-phase and allowed to relax at an average strain rate of 1 x 10(exp -5) for 3 h and subsequently deformed at a constant strain rate of 1 x 10(exp -4). The olivine to beta-phase transformation and deformation result in a bimodal grain size with the large grains having a preferred orientation. Deformation by dislocation creep and subgrain formation causes grain size reduction and nearly identical microstructures in the relaxed and high strain-rate samples. The dominant slip systems involved in the deformation of polycrystalline beta-phase appear to be (010) zone axis (100) and (010) zone axis (001). Slip in the zone axis (001) direction occurs by the glide of disassociated dislocations and produces Shockley-type stacking faults. The anisotropy that develops from the olivine to beta-phase transformation under stress and subsequent dislocation creep may have profound effects on dynamic processes in the transition zone.

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