Elasticity of a grossular-pyrope-almandine garnet

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

Research output: Contribution to journalArticlepeer-review

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
DOIs
StatePublished - 1989

ASJC Scopus subject areas

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

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