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Crystallographic preferred orientation of akimotoite and seismic anisotropy of Tonga slab

Author

Listed:
  • 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
    Faculty of Sciences, Kyushu University)

  • Dapeng Zhao

    (Tohoku University)

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.

Suggested Citation

  • Rei Shiraishi & Eiji Ohtani & Kyuichi Kanagawa & Akira Shimojuku & Dapeng Zhao, 2008. "Crystallographic preferred orientation of akimotoite and seismic anisotropy of Tonga slab," Nature, Nature, vol. 455(7213), pages 657-660, October.
    • Handle: RePEc:nat:nature:v:455:y:2008:i:7213:d:10.1038_nature07301
    DOI: 10.1038/nature07301
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