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Sound velocities of wadsleyite ß-(Mg_0.88Fe_0.12)₂SiO₄ to 10 GPa

¹ Center for High Pressure Research and Mineral Physics Institute, State University of New York at Stony Brook, Stony Brook, New York 11794-2100, U.S.A.
² Department of Geosciences, State University of New York at Stony Brook, Stony Brook, New York 11794-2100, U.S.A.

Correspondence: ^* E-mail: bli{at}ccmail.sunysb.edu

We measured the sound velocity of wadsleyite ß-(Mg_0.88Fe_0.12)₂SiO₄ to 9.6 GPa at room temperature using ultrasonic techniques in a uniaxial split-cylinder apparatus using a polycrystalline specimen hot-pressed at 14 GPa and 1200 °C. Bench-top velocity measurements yielded V_P = 9.33(3) km/s and V_S = 5.43(2) km/s; the calculated bulk modulus (K) and shear modulus (G) are 172(2) GPa and 106(1) GPa, respectively. These K and G values are indistinguishable from those for single crystal and polycrystalline specimens of Mg₂SiO₄-wadsleyite. Pressure derivatives of the bulk and shear moduli have been obtained by fitting the current experimental data to 9.6 GPa using third-order, finite strains equations, yielding K_S0^' = 4.6(1) and G₀^' = 1.5(1). From comparison with previous data for similar specimens and techniques, we observe no effect of iron content on the pressure derivatives of either the bulk or shear moduli, within the limited compositional range investigated.

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