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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Xiang Wu & Jung-Fu Lin & Pamela Kaercher & Zhu Mao & Jin Liu & Hans-Rudolf Wenk & Vitali B. Prakapenka, 2017. "Seismic anisotropy of the D″ layer induced by (001) deformation of post-perovskite," Nature Communications, Nature, vol. 8(1), pages 1-6, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14669
    DOI: 10.1038/ncomms14669
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