Elastic properties of polycrystalline MgSiO3 perovskite were determined by means of resonance sphere technique at temperatures from 258 to 318 K under atmospheric pressure. The temperature derivatives of adiabatic bulk (∂KS/∂T)P and shear moduli (∂G/∂T)P are -0.029(2) GPa/K and -0.024(1) GPa/K, respectively. Applying the present results in interpretation of seismological observations, we suggest that the chemical composition of the earth's lower mantle is pyrolitic at the potential temperature of 1600 K.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)