Elasticity of subducted basaltic crust at the lower mantle pressures: Insights on the nature of deep mantle heterogeneity

► Ab initio high-pressure elasticity of the pyrolitic and basaltic compositions. ► Shear modulus of cubic calcium perovskite smaller than earlier values. ► Anticorrelation between VΦ and VS expected in the basalt/pyrolite mixture. ► Significant low VS anomaly expected for the hot and dense subducted crusts.