Single-crystal elasticity of -Mg 2 SiO 4 to the pressure of the 410 km seismic discontinuity in the Earth's mantle

Computer Science

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Transition Zones, Elasticity, Spinel, Upper Mantle

Scientific paper

The complete set of elastic stiffness coefficients of a single crystal of Mg 2 SiO 4 in the modified spinel (wadsleyite) structure are reported at eight pressures from ambient to 14 Gigapascals (GPa). All moduli vary linearly with pressure within the resolution of the data. Third-order Birch-Murnaghan equation fits to aggregate elastic moduli yield values of 170 (±2) GPa and 4.3 (±0.2) for the adiabatic bulk modulus and its first pressure derivative, and 115 (±2) GPa and 1.4 (±0.2) for the shear modulus and its pressure derivative. These data, together with previous results for -Mg 2 SiO 4 , enable us to make the first in situ determination of the velocity increase due to the - transition at the pressure (~ 13.8 GPa) of the 410 km discontinuity. The room-temperature velocity increase at the transition pressure is 9.8% for compressional waves and 12.4% for shear waves.

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