Elasticity of a grossular-pyrope-almandine garnet

B. O'Neill, J. D. Bass, J. R. Smyth, M. T. Vaughan

Research output: Contribution to journalArticle

Abstract

The single-crystal elastic properties of a natural, grossular-rich garnet solid solution have been measured at ambient conditions using Brillouin spectroscopy. This garnet sample is unusual for a grossular in that it contains appreciable pyrope and almandine components, with a composition of Gr48.4Py27.6Alm23.4Sp0.6. It is thus suitable for investigating the variation of elastic properties with composition in Ca-rich garnet solid solutions that are stable only at high pressure. The values obtained for the bulk modulus, K = 170.4(6), and for the shear modulus, μ = 101.6(3), of the garnet examined in this study, vary by less than 1% from those obtained from a weighted sum of the end-member moduli. This suggests that any composition in the grossular-pyrope-almandine system, which comprise the majority of upper mantle garnets, is accurately estimated with this simple approach. More complex elasticity-composition variations observed for the grossular-andradite garnets may be specific to garnet solid solutions where the cation substitutions occur at six-coordinated crystallographic sites. -Authors

Original languageEnglish (US)
Pages (from-to)17,819-17,824
JournalJournal of Geophysical Research
Volume94
Issue numberB12
StatePublished - Jan 1 1989

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grossular
almandine
pyrope
Garnets
elasticity (mechanics)
garnets
elasticity
Elasticity
garnet
elastic properties
solid solution
Solid solutions
solid solutions
elastic property
shears
crystals
Chemical analysis
spectroscopy
cations
Elastic moduli

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

O'Neill, B., Bass, J. D., Smyth, J. R., & Vaughan, M. T. (1989). Elasticity of a grossular-pyrope-almandine garnet. Journal of Geophysical Research, 94(B12), 17,819-17,824.

Elasticity of a grossular-pyrope-almandine garnet. / O'Neill, B.; Bass, J. D.; Smyth, J. R.; Vaughan, M. T.

In: Journal of Geophysical Research, Vol. 94, No. B12, 01.01.1989, p. 17,819-17,824.

Research output: Contribution to journalArticle

O'Neill, B, Bass, JD, Smyth, JR & Vaughan, MT 1989, 'Elasticity of a grossular-pyrope-almandine garnet', Journal of Geophysical Research, vol. 94, no. B12, pp. 17,819-17,824.
O'Neill B, Bass JD, Smyth JR, Vaughan MT. Elasticity of a grossular-pyrope-almandine garnet. Journal of Geophysical Research. 1989 Jan 1;94(B12):17,819-17,824.
O'Neill, B. ; Bass, J. D. ; Smyth, J. R. ; Vaughan, M. T. / Elasticity of a grossular-pyrope-almandine garnet. In: Journal of Geophysical Research. 1989 ; Vol. 94, No. B12. pp. 17,819-17,824.
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