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

doi:10.1038/srep33337

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

Institute for Planetary Materials

Research output: Contribution to journal › Article › peer-review

13 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 language	English
Article number	33337
Journal	Scientific reports
Volume	6
DOIs	https://doi.org/10.1038/srep33337
Publication status	Published - Sept 19 2016

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

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.",

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T2 - A key to interpret seismic anomalies in the lower mantle

AU - Fukui, Hiroshi

AU - Yoneda, Akira

AU - Nakatsuka, Akihiko

AU - Tsujino, Noriyoshi

AU - Kamada, Seiji

AU - Ohtani, Eiji

AU - Shatskiy, Anton

AU - Hirao, Naohisa

AU - Tsutsui, Satoshi

AU - Uchiyama, Hiroshi

AU - Baron, Alfred Q.R.

PY - 2016/9/19

Y1 - 2016/9/19

N2 - 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.

AB - 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.

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

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