P-V-T equation of state of stishovite up to mid-lower mantle conditions

摘要: [1] In situ P-V-T measurements of stishovite have been performed throughout its stability field from 17 to 54 GPa and 300 1700 K, by using a sintered-diamond multianvil apparatus synchrotron radiations. The equation state was precisely determined on the basis Mie-Gruneisen-Debye model both Morse-Rydberg (Vinet) third-order Burch-Murnaghan equations for reference isotherms. new gives thermoelastic properties such as density, adiabatic bulk modulus, thermal expansivity, isobaric heat capacity without extrapolation mid-lower mantle conditions, these at zero pressures are consistent with those previous measurements. present yields lower density larger modulus conditions compared obtained extrapolate upper conditions. Our is important quantitatively modeling fate subducted silica-rich rocks MORB pelagic sediments, interpreting seismological observations.