Single-crystal elasticity of natural Fe-bearing orthoenstatite across a high-pressure phase transition

Jin S. Zhang, Jay D. Bass

Research output: Contribution to journalArticle

Abstract

Sound velocities and elastic moduli have been measured on Fe-bearing orthoenstatite (OEN) single crystals up to 12 GPa by Brillouin spectroscopy. The ambient adiabatic bulk modulus (Ks0) and shear modulus (G0) are determined to be 113(1) GPa and 75.9(7) GPa, respectively. A fourth-order finite strain fit to the data yields pressure derivatives of Ks0′ = 8.8(1), Ks0″ = −0.68(6), G0′ = 2.9(1), and G0″ = −0.40(2). These values are significantly higher than those for other major mantle minerals up to 10.5 GPa but lower than some previous measurements on OEN. A pronounced increase of shear anisotropy was observed at a pressure of 12.06(9) GPa, coinciding with a phase transition from orthoenstatite to a recently discovered high-pressure phase with space group P21/c. A high-pressure phase transition in OEN is unlikely to be the cause of the X discontinuity in the 250–325 km depth range. Rather, a change in seismic anisotropy would be expected to accompany the orthoenstatite-to-P21/c phase transition in the upper mantle at greater depths.

Original languageEnglish (US)
Pages (from-to)8473-8481
Number of pages9
JournalGeophysical Research Letters
Volume43
Issue number16
DOIs
StatePublished - Aug 28 2016

Keywords

  • OEN-HPCEN2 transition
  • X discontinuity
  • high pressure
  • orthoenstatite
  • single-crystal elasticity

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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