Texture development and deformation mechanisms in ringwoodite

Details Texture development and deformation mechanisms in ringwoodite Texture development and deformation mechanisms in ringwoodite

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pepi..152..191w&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 152, Issue 3, p. 191-199.

Physics

9

Scientific paper

Ringwoodite Mg2SiO4 with spinel structure is an important phase in the earth's mantle transition zone. Controlled deformation experiments showed that ringwoodite underwent ductile deformation when compressed axially at 6 10 GPa and at room temperature in a multianvil D-DIA deformation apparatus. Texture evolution during cyclic compression has been recorded in situ using X-ray transparent anvils with monochromatic synchrotron X-ray diffraction and a two-dimensional detector. Quantitative analysis of the images with the Rietveld method revealed a 1 1 0 fiber texture. By comparing this texture pattern with polycrystal plasticity simulations, it is inferred that {1 1 1}<1¯ 1 0> slip is the dominant deformation mechanism in ringwoodite, consistent with high temperature mechanisms observed in other spinel-structured materials. Although strong ringwoodite textures may develop in the transition zone, the contribution to bulk anisotropy is minimal due to the weak single-crystal anisotropy.

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