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

Akira Yoneda (), Hiroshi Fukui, Fang Xu, Akihiko Nakatsuka, Akira Yoshiasa, Yusuke Seto, Kenya Ono, Satoshi Tsutsui, Hiroshi Uchiyama and Alfred Q. R. Baron
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Akira Yoneda: Institute for Study of the Earth’s Interior, Okayama University, Misasa
Hiroshi Fukui: Graduate School of Material Science, University of Hyogo, Kamigori
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

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms4453

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