Elasticity of MgSiO_3 orthoenstatite
Abstract
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.
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.Additional details
- Eprint ID
- 38229
- Resolver ID
- CaltechAUTHORS:20130502-093059884
- NSF
- REU Program
- Created
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2013-05-03Created from EPrint's datestamp field
- Updated
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2020-01-24Created from EPrint's last_modified field
- Caltech groups
- Seismological Laboratory, Division of Geological and Planetary Sciences