Rheology of post-perovskite and the lowermost lower mantle inferred from high pressure experiments

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Post-perovskite is considered to be the dominant phase in the lowermost lower mantle(D "layer). Therefore, we investigated rheology of post-perovskite associated with the phase transformation from perovskite to post-perovskite by means of high pressure experiments to understand the dynamics of the earth's interior. Grain size is a key parameter which controls the mechanism of deformation and viscosity of constituting materials. Based on present experimental results, significant grain size reduction occurs during phase transformation and hence viscosity reduction is expected in the Dlayer.