Simulating texture evolution of olivine aggregates under dynamic loading
Abstract
Seismic anisotropy in regions of the mantle indicate the presence of preferred orientation in the grains of mantle minerals. Modeling texture evolution of these minerals is one way of studying the microdynamics at that depth. We simulate the response of polycrystalline olivine under a sinusoidally varying stress at mantle pressures. The simulation is executed as sequential runs of the EPSC (elastic plastic self-consistent) package. This program uses the constitutive relations to solve for the average repsonse of polycrystal aggregates undergoing thermo-mechanical processes within the elastic and plastic regimes. The result of the model include internal strains and peak intensities across several planes of the olivine crystallites. This information allows us to monitor the development of preferred orientation and other aspects of grain dynamics necessary to understand some of the observed seismic anomalies.These results are also compared to those of recent dynamic loading experiments used to probe the anelastic properties of olivine.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFMMR43A2131S
- Keywords:
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- 3909 MINERAL PHYSICS / Elasticity and anelasticity