Effect of cation substitution on bridgmanite elasticity: A key to interpret seismic anomalies in the lower mantle

Hiroshi Fukui, Akira Yoneda, Akihiko Nakatsuka, Noriyoshi Tsujino, Seiji Kamada, Eiji Ohtani, Anton Shatskiy, Naohisa Hirao, Satoshi Tsutsui, Hiroshi Uchiyama, Alfred Q.R. Baron

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    Seismological observations show that, in some regions of the lower mantle, an increase in bulk sound velocity, interestingly, occurs in the same volume where there is a decrease in shear velocity. We show that this anti-correlated behavior occurs on cation substitution in bridgmanite by making single crystal elasticity measurements of MgSiO 3 and (Mg,Fe,Al)(Si,Al)O 3 using inelastic x-ray scattering in the ambient conditions. Cation substitution of ferrous iron and aluminum may explain large low shear velocity provinces in the lower mantle.

    Original languageEnglish
    Article number33337
    JournalScientific reports
    Volume6
    DOIs
    Publication statusPublished - Sep 19 2016

    ASJC Scopus subject areas

    • General

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