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American Mineralogist; February 2000; v. 85; no. 2; p. 296-303
© 2000 Mineralogical Society of America
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Sound velocities and elastic properties of {gamma}-Mg2SiO4 to 873 K by Brillouin spectroscopy

Jennifer M. Jackson*, Stanislav V. Sinogeikin and Jay D. Bass

Department of Geology, University of Illinois, Urbana, Illinois 61801, U.S.A.

The sound velocities and single-crystal elastic moduli of spinel-structured {gamma}-Mg2SiO4 were measured to 873 K by Brillouin spectroscopy using a new high-temperature cell designed for single-crystal measurements. These are the first reported acoustic measurements of {gamma}-Mg2SiO4 elasticity at high temperatures. A linear decrease of elastic moduli and sound velocities with temperature adequately describes the data. The adiabatic bulk modulus, KS, shear modulus, µ, and respective temperature derivatives for {gamma}-Mg2SiO4 are: KS = 185(3) GPa, µ = 120.4(2.0) GPa, ({partial}KS/{partial}T)P = –0.024(3) GPa/K and ({partial}µ/{partial}T)P = –0.015(2) GPa/K. Extrapolation of our data to transition zone pressures and temperatures indicates that the shear and compressional impedance contrasts associated with ß- ->{gamma}-(Mg,Fe)2SiO4 transition are sufficient to produce an observable discontinuity at 520 km depth, even with a moderate (30–50%) amount of olivine.




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