Trench-parallel anisotropy produced by serpentine deformation in the hydrated mantle wedge

Ikuo Katayama (), Ken-ichi Hirauchi, Katsuyoshi Michibayashi and Jun-ichi Ando
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Ikuo Katayama: Hiroshima University
Ken-ichi Hirauchi: Hiroshima University
Katsuyoshi Michibayashi: Institute of Geosciences, Shizuoka University
Jun-ichi Ando: Hiroshima University

Nature, 2009, vol. 461, issue 7267, 1114-1117

Abstract: Serpentine deformation in the trenches Although seismic anisotropy in the upper mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy observed in several subduction systems is difficult to explain in terms of olivine anisotropy, even if the entire mantle wedge were to act as an anisotropic source. Using high-pressure deformation experiments, Ikuo Katayama and colleagues show that the crystal-preferred orientation of serpentine, the main hydrous mineral in the upper mantle, can produce the strong trench-parallel seismic anisotropy observed in such subduction systems.

Date: 2009
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DOI: 10.1038/nature08513

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