The elastic constants of Mn2SiO4, Fe2SiO4 and Co2SiO4, and the elastic properties of olivine group minerals at high temperature.

Abstract

Elastic constants of single-crystal Mn2SiO4, Fe2SiO4 and Co2SiO4 olivine are measured by the rectangular parallelepiped resonance (RPR) method at temperatures between 20° and 400°C. Elastic constants Cij (Mbar) and their temperature derivatives ∂Cij/∂T (kbar/deg) are: The isotropic properties, density ρ, adiabatic bulkmodulus K3, rigidityμ, the Poisson's ratio σ, and their temperature derivatives calculated by the Voigt-Reuss-Hill scheme are: By combining the present results with the previous data on a magnesium rich olivine, the effect of cation substitution on the elastic properties of olivine group minerals is discussed and the elastic constants of olivine at high temperature in the earth's mantle are clarified.