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Sound velocities and elastic properties of γ-Mg_2SiO_4 to 873 K by Brillouin spectroscopy

Jackson, Jennifer M. and Sinogeikin, Stanislav V. and Bass, Jay D. (2000) Sound velocities and elastic properties of γ-Mg_2SiO_4 to 873 K by Brillouin spectroscopy. American Mineralogist, 85 (2). pp. 296-303. ISSN 0003-004X. http://resolver.caltech.edu/CaltechAUTHORS:20140225-143137368

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Abstract

The sound velocities and single-crystal elastic moduli of spinel-structured γ-Mg_2SiO_4 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 γ-Mg_2SiO_4 elasticity at high temperatures. A linear decrease of elastic moduli and sound velocities with temperature adequately describes the data. The adiabatic bulk modulus, K_S, shear modulus, μ, and respective temperature derivatives for γ-Mg_2SiO_4 are: K_S = 185(3) GPa, μ = 120.4(2.0) GPa, (∂K_S/∂T)_P = −0.024(3) GPa/K and (∂μ/∂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 β- →γ-(Mg,Fe)_2SiO_4 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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Additional Information:© 2000 Mineralogical Society of America. Manuscript Received Apri 7, 1999. Manuscript Accepted September 29, 1999. Paper handled by Robert C. Liebermann. We thank Donald J. Weidner and the Center for High Pressure Research (CHiPR) for providing the samples used in this study. We also thank James Palko for help in constructing the high-temperature cell. This research was supported by NSF. Jennifer M. Jackson was supported in part by the Research Experiences for Undergraduates program of the NSF.
Group:Seismological Laboratory
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Record Number:CaltechAUTHORS:20140225-143137368
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140225-143137368
Official Citation: Jennifer M. Jackson, Stanislav V. Sinogeikin, and Jay D. Bass Sound velocities and elastic properties of γ-Mg2SiO4 to 873 K by Brillouin spectroscopy American Mineralogist, February, v. 85, p. 296-303
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ID Code:43990
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:25 Feb 2014 23:00
Last Modified:11 Jun 2015 21:41

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