Elasticity of a majorite-pyrope solid solution

J. D. Bass, Masami Kanzaki

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The elastic properties of a solid solution consisting of 59 mole percent pyropic garnet and 41 percent Mg4Si4O12-majorite (a high-pressure form of pyroxene), have been measured by Brillouin spectroscopy under ambient conditions. Values of the adiabatic bulk modulus, Ks=164±15 GPa, and shear modulus, G=89.4±3.7 GPa, are similar to those for low-pressure aluminosilicate garnets. The enstatite-majorite reaction is characterized by a large (49%) increase in Ks and a much smaller (13%) increase in G. Taken at face value, the STP properties of these phases imply that large quantities of Ca-rich clinopyroxene are needed in order to satisfy seismologically determined shear modulus gradients in the transition zone. This suggestion is, however, subject to considerable uncertainties in the pressure and temperature derivatives of elastic properties for mantle minerals, and the velocity structure of the transition zone. -from Authors

Original languageEnglish
Pages (from-to)1989-1992
Number of pages4
JournalGeophysical Research Letters
Volume17
Issue number11
Publication statusPublished - 1990
Externally publishedYes

Fingerprint

majorite
pyrope
elastic property
shear modulus
solid solution
garnets
transition zone
elasticity
garnet
solid solutions
elastic properties
shear
enstatite
bulk modulus
aluminosilicate
velocity structure
pyroxene
clinopyroxene
suggestion
low pressure

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Elasticity of a majorite-pyrope solid solution. / Bass, J. D.; Kanzaki, Masami.

In: Geophysical Research Letters, Vol. 17, No. 11, 1990, p. 1989-1992.

Research output: Contribution to journalArticle

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