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Effect of cation substitution on bridgmanite elasticity: A key to interpret seismic anomalies in the lower mantle
Description
<jats:title>Abstract</jats:title><jats:p>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<jats:sub>3</jats:sub> and (Mg,Fe,Al)(Si,Al)O<jats:sub>3</jats:sub> 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.</jats:p>
Journal
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- Scientific Reports
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Scientific Reports 6 (1), 33337-, 2016-09-19
Springer Science and Business Media LLC