In-situ elasticity measurement for the unquenchable high-pressure clinopyroxene phase: Implication for the upper mantle

Jennifer Kung, Baosheng Li, Takeyuki Uchida, Yanbin Wang

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Polycrystal elasticity of the unquenchable MgSiO3 high-pressure clinoenstatite has been measured using ultrasonic interferometry in conjunction with in-situ X-ray diffraction and imaging techniques within its stability field in a large volume multi-anvil apparatus for the first time. At 6.5 GPa, we obtained ∂KS/∂P = 5.6(3), ∂G/∂P = 1.5(1), ∂KS/∂T = -0.017(1) GPa K-1 and (∂G/∂T) = -0.015(1) GPa K-1. Our results show that the elastic velocities of HP-CEN are not only higher than those of OEN but also higher than olivine at upper mantle conditions. According to these new data, the elastic velocities for the "depleted" mantle composition, with ∼20 vol% of HP-CEN, would result in ∼0.8% and ∼1.6% in difference for P and S waves, respectively, when OEN data were used in previous calculations. Newly measured results also suggest that it is possible to distinguish "undepleted" and "depleted" composition models in the upper mantle.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Volume32
Issue number1
DOIs
Publication statusPublished - 2005 Jan 16

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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