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, Alfred Q R Baron

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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.

Original languageEnglish
Pages (from-to)3453
Number of pages1
JournalNature Communications
Volume5
DOIs
Publication statusPublished - 2014

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ASJC Scopus subject areas

  • Medicine(all)

Cite this

Yoneda, A., Fukui, H., Xu, F., Nakatsuka, A., Yoshiasa, A., Seto, Y., Ono, K., Tsutsui, S., Uchiyama, H., & Baron, A. Q. R. (2014). Elastic anisotropy of experimental analogues of perovskite and post-perovskite help to interpret D'' diversity. Nature Communications, 5, 3453. https://doi.org/10.1038/ncomms4453