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Elasticity of MgSiO_3 orthoenstatite

Jackson, Jennifer M. and Sinogeikin, Stanislav V. and Bass, Jay D. (1999) Elasticity of MgSiO_3 orthoenstatite. American Mineralogist, 84 (4). pp. 677-680. ISSN 0003-004X.

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The single-crystal elastic moduli of the MgSiO_3 orthoenstatite end-member have been measured by Brillouin spectroscopy at ambient conditions. The aggregate elastic moduli at 1 atm are K_s = 107.6(15) GPa and µ = 76.8(7) GPa, for the adiabatic bulk modulus and shear modulus, respectively. These values are in excellent agreement with the results of previous acoustic studies of synthetic MgSiO_3 . Comparison of our results with pressure-volume (P-V) measurements do not support the presence of a change in the P-V trajectory of orthoenstatite at approximately 4 GPa, as suggested previously on the basis of X-ray measurements to 8.5 GPa. The effects of chemical composition on the elasticity of orthopyroxenes are well represented by the variation of compressional and shear velocities with density, which exhibit well defined trends for both synthetic and natural samples.

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Jackson, Jennifer M.0000-0002-8256-6336
Additional Information:© 1999 Mineralogical Society of America. Manuscript Received September 28, 1998; Manuscript Accepted December 21, 1998; Paper handled by William A. Bassett. This research was funded by the National Science Foundation, and the REU program which supported J.M.J. We thank R. Angel, M. Elwood, and J. Palko for helpful discussions, and G.R. Rossmann (Caltech) for providing samples.
Group:Seismological Laboratory
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Issue or Number:4
Record Number:CaltechAUTHORS:20130502-093059884
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38229
Deposited By: Tony Diaz
Deposited On:03 May 2013 22:02
Last Modified:24 Jan 2020 18:48

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