Seismic anisotropy of the D″ layer induced by (001) deformation of post-perovskite

Xiang Wu (), Jung-Fu Lin (), Pamela Kaercher, Zhu Mao, Jin Liu, Hans-Rudolf Wenk and Vitali B. Prakapenka
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Xiang Wu: State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences
Jung-Fu Lin: Jackson School of Geosciences, The University of Texas at Austin
Pamela Kaercher: Ocean and Ecological Sciences, University of Liverpool
Zhu Mao: School of Earth and Space Sciences, University of Science and Technology of China
Jin Liu: Jackson School of Geosciences, The University of Texas at Austin
Hans-Rudolf Wenk: University of California
Vitali B. Prakapenka: Center for Advanced Radiation Sources, The University of Chicago

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Crystallographic preferred orientation (CPO) of post-perovskite (Mg,Fe)SiO3 (pPv) has been believed to be one potential source of the seismic anisotropic layer at the bottom of the lower mantle (D″ layer). However, the natural CPO of pPv remains ambiguous in the D″ layer. Here we have carried out the deformation experiments of pPv-(Mg0.75,Fe0.25)SiO3 using synchrotron radial X-ray diffraction in a membrane-driven laser-heated diamond anvil cell from 135 GPa and 2,500 K to 154 GPa and 3,000 K. Our results show that the intrinsic texture of pPv-(Mg0.75,Fe0.25)SiO3 should be (001) at realistic P–T conditions of the D″ layer, which can produce a shear wave splitting anisotropy of ∼3.7% with VSH>VSV. Considering the combined effect of both pPv and ferropericlase, we suggest that 50% or less of deformation is sufficient to explain the origin of the shear wave anisotropy observed seismically in the D″ layer beneath the circum-Pacific rim.

Date: 2017
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DOI: 10.1038/ncomms14669

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