Single-crystal elastic properties of Ca0.07Mg1.93 Si2O6 orthopyroxene

Jean Philippe Perrillat; Fabrizio Nestola; Stanislav V. Sinogeikin; Jay D. Bass

doi:10.2138/am.2007.2276

Single-crystal elastic properties of Ca_0.07Mg_1.93 Si₂O₆ orthopyroxene

Jean Philippe Perrillat, Fabrizio Nestola, Stanislav V. Sinogeikin, Jay D. Bass

Earth Science and Environmental Change

Research output: Contribution to journal › Article › peer-review

Abstract

The single-crystal elastic properties of Ca_0.07 Mg_1.93Si₂O₆ orthopyroxene (space group Pbca) have been investigated by Brillouin spectroscopy at ambient conditions. The aggregate bulk and shear moduli, K_0.5 = 102.5 GPa (1.5) and μ = 74.2 GPa (1.1), respectively, are ∼5% and ∼3% lower than commonly accepted values for MgSiO₃ end-member (K_0.5 = 107.6, μ = 76.8 GPa). These results indicate that the incorporation of small amount of Ca in the orthoenstatite structure does not greatly affect its elastic properties. As a consequence, the increase in bulk modulus reported in natural orthopyroxenes relative to the Mg-end-member is not related to the substitution of Ca in the M2 octahedral sites, but more probably to the substitution of Al in tetrahedral sites.

Original language	English (US)
Pages (from-to)	109-113
Number of pages	5
Journal	American Mineralogist
Volume	92
Issue number	1
DOIs	https://doi.org/10.2138/am.2007.2276
State	Published - Jan 1 2007

Keywords

Brillouin spectroscopy
Elastic properties
Enstatite
Orthopyroxene

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology

Online availability

10.2138/am.2007.2276

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Cite this

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title = "Single-crystal elastic properties of Ca0.07Mg1.93 Si2O6 orthopyroxene",

abstract = "The single-crystal elastic properties of Ca0.07 Mg1.93Si2O6 orthopyroxene (space group Pbca) have been investigated by Brillouin spectroscopy at ambient conditions. The aggregate bulk and shear moduli, K0.5 = 102.5 GPa (1.5) and μ = 74.2 GPa (1.1), respectively, are ∼5% and ∼3% lower than commonly accepted values for MgSiO3 end-member (K0.5 = 107.6, μ = 76.8 GPa). These results indicate that the incorporation of small amount of Ca in the orthoenstatite structure does not greatly affect its elastic properties. As a consequence, the increase in bulk modulus reported in natural orthopyroxenes relative to the Mg-end-member is not related to the substitution of Ca in the M2 octahedral sites, but more probably to the substitution of Al in tetrahedral sites.",

keywords = "Brillouin spectroscopy, Elastic properties, Enstatite, Orthopyroxene",

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AU - Nestola, Fabrizio

AU - Sinogeikin, Stanislav V.

AU - Bass, Jay D.

PY - 2007/1/1

Y1 - 2007/1/1

N2 - The single-crystal elastic properties of Ca0.07 Mg1.93Si2O6 orthopyroxene (space group Pbca) have been investigated by Brillouin spectroscopy at ambient conditions. The aggregate bulk and shear moduli, K0.5 = 102.5 GPa (1.5) and μ = 74.2 GPa (1.1), respectively, are ∼5% and ∼3% lower than commonly accepted values for MgSiO3 end-member (K0.5 = 107.6, μ = 76.8 GPa). These results indicate that the incorporation of small amount of Ca in the orthoenstatite structure does not greatly affect its elastic properties. As a consequence, the increase in bulk modulus reported in natural orthopyroxenes relative to the Mg-end-member is not related to the substitution of Ca in the M2 octahedral sites, but more probably to the substitution of Al in tetrahedral sites.

AB - The single-crystal elastic properties of Ca0.07 Mg1.93Si2O6 orthopyroxene (space group Pbca) have been investigated by Brillouin spectroscopy at ambient conditions. The aggregate bulk and shear moduli, K0.5 = 102.5 GPa (1.5) and μ = 74.2 GPa (1.1), respectively, are ∼5% and ∼3% lower than commonly accepted values for MgSiO3 end-member (K0.5 = 107.6, μ = 76.8 GPa). These results indicate that the incorporation of small amount of Ca in the orthoenstatite structure does not greatly affect its elastic properties. As a consequence, the increase in bulk modulus reported in natural orthopyroxenes relative to the Mg-end-member is not related to the substitution of Ca in the M2 octahedral sites, but more probably to the substitution of Al in tetrahedral sites.

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