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Elastic anisotropy of experimental analogues of perovskite and post-perovskite help to interpret D′′ diversity

Author

Listed:
  • Akira Yoneda

    (Institute for Study of the Earth’s Interior, Okayama University, Misasa)

  • Hiroshi Fukui

    (Graduate School of Material Science, University of Hyogo, Kamigori
    Materials Dynamics Laboratory, RIKEN SPring-8 Center, RIKEN)

  • Fang Xu

    (Institute for Study of the Earth’s Interior, Okayama University, Misasa)

  • Akihiko Nakatsuka

    (Graduate School of Science and Engineering, Yamaguchi University, Ube)

  • Akira Yoshiasa

    (Graduate School of Science and Technology, Kumamoto University)

  • Yusuke Seto

    (Graduate School of Science, Kobe University)

  • Kenya Ono

    (University of Toyama)

  • Satoshi Tsutsui

    (Japan Synchrotron Radiation Research Institute, SPring-8, Sayo)

  • Hiroshi Uchiyama

    (Japan Synchrotron Radiation Research Institute, SPring-8, Sayo)

  • Alfred Q. R. Baron

    (Materials Dynamics Laboratory, RIKEN SPring-8 Center, RIKEN
    Japan Synchrotron Radiation Research Institute, SPring-8, Sayo)

Abstract

Recent studies show that the D′′ layer, just above the Earth's core–mantle boundary, is composed of MgSiO3 post-perovskite and has significant lateral inhomogeneity. Here we consider the D′′ diversity as related to the single-crystal elasticity of the post-perovskite phase. We measure the single-crystal elasticity of the perovskite Pbnm-CaIrO3 and post-perovskite Cmcm-CaIrO3 using inelastic X-ray scattering. These materials are structural analogues to same phases of MgSiO3. Our results show that Cmcm-CaIrO3 is much more elastically anisotropic than Pbnm-CaIrO3, which offers an explanation for the enigmatic seismic wave velocity jump at the D′′ discontinuity. Considering the relation between lattice preferred orientation and seismic anisotropy in the D′′ layer, we suggest that the c axis of post-perovskite MgSiO3 aligns vertically beneath the Circum-Pacific rim, and the b axis vertically beneath the Central Pacific.

Suggested Citation

  • Akira Yoneda & Hiroshi Fukui & Fang Xu & Akihiko Nakatsuka & Akira Yoshiasa & Yusuke Seto & Kenya Ono & Satoshi Tsutsui & Hiroshi Uchiyama & Alfred Q. R. Baron, 2014. "Elastic anisotropy of experimental analogues of perovskite and post-perovskite help to interpret D′′ diversity," Nature Communications, Nature, vol. 5(1), pages 1-8, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4453
    DOI: 10.1038/ncomms4453
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