Texture development and deformation mechanisms in ringwoodite |
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Authors: | H.-R. Wenk G. Ischia N. Nishiyama T. Uchida |
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Affiliation: | a Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA b GeoForschungsZentrum Potsdam, 14473 Potsdam, Germany c Dip. Ingegneria dei Materiali e Tecnologie Industriali, Università Trento, 38050 Trento, Italy d Center for Advanced Radiation Sources, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA |
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Abstract: | 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 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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Keywords: | Ringwoodite Texture Multianvil apparatus Synchrotron X-rays Deformation mechanisms Transition zone |
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