Crystallographic preferred orientation of akimotoite and seismic anisotropy of Tonga slab

Rei Shiraishi (), Eiji Ohtani, Kyuichi Kanagawa, Akira Shimojuku and Dapeng Zhao
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Rei Shiraishi: Institute of Mineralogy, Petrology, and Economic Geology
Eiji Ohtani: Institute of Mineralogy, Petrology, and Economic Geology
Kyuichi Kanagawa: Chiba University
Akira Shimojuku: Institute of Mineralogy, Petrology, and Economic Geology
Dapeng Zhao: Tohoku University

Nature, 2008, vol. 455, issue 7213, 657-660

Abstract: The Tonga Slab: akimotoite under pressure Akimotoite is a mineral with the composition (Mg,Fe)SiO3 found at the bottom of the Earth's mantle transition zone and the uppermost lower mantle, especially under low temperature conditions. It is the most anisotropic mineral in the mantle transition zone, and it has been predicted that if akimotoite crystals are preferentially oriented by plastic deformation, a cold slab would be extremely anisotropic. Shiraishi et al. performed plastic deformation experiments on polycrystalline akimotoite under high pressure conditions and temperatures of 1,000–1,300 °C, and observed a change in its crystallographic preferred orientation pattern with temperature. This may explain variations observed in compressional-wave seismic anisotropy in subduction zones — for example between the northern and southern segments of the Tonga slab, which could be attributed to differences in crystallographic preferred orientation patterns of akimotoite at different temperatures within the slab.

Date: 2008
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DOI: 10.1038/nature07301

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