[S16-1] Large low shear velocity provinces and deep mantle structure

[S16-1-06] Effect of cation substitution on bridgmanite elasticity

Hiroshi Fukui^{1, 2}, Akira Yoneda³, Akihiko Nakatsuka⁴, ^○Seiji Kamada⁵, Takashi Yoshino³, Alfred Baron² (1.Graduate School of Material Science, University of Hyogo, 2.Materials Dynamics Laboratory, RIKEN SPring-8 Center, 3.Institute for Planetary Materials, Okayama University, 4.Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 5.Frontier Research Institute for Interdisciplinary Sciences, Tohoku University)

Single crystal elasticity of MgSiO3 bridgmanite and cation-substituted ones has been investigated using inelastic x-ray scattering technique. The present results demonstrated that iron substitution in bridgmanite makes bulk modulus of bridgmanite larger and shear modulus smaller at the ambient conditions. This corresponds to anti-correlated behavior: bulk sound velocity increases while shear wave velocity decreases. Cation substitution may explain the anti-correlated seismic velocity anomaly observed in the LLSPVs.