Elasticity of (Mg0.87Fe0.13)2SiO4 wadsleyite to 12 GPa and 1073 K

Wei Liu, Jennifer Kung, Baosheng Li, Nori Nishiyama, Yanbin Wang

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31 Citations (Scopus)

Abstract

Elasticity of (Mg0.87Fe0.13)2SiO4 wadsleyite has been measured at simultaneous high pressure and high temperature to 12 GPa and 1073 K using ultrasonic interferometry in conjunction with synchrotron X-radiation. The elastic moduli and their pressure and temperature derivatives are precisely determined using pressure-standard-free third-order and fourth-order finite strain equations. Combined with previous thermoelastic data on olivine, the density, velocity and acoustic impedance contrasts between α- and β-(Mg0.9Fe0.1)2SiO4 at 410-km depth are calculated along a 1673 K adiabatic geotherm. Both the third- and fourth-order finite strain equation fitting results give estimation of ∼33-58% olivine content in the upper mantle to account for a seismic discontinuity of ∼5% velocity jumps, and 8.5% (P wave) and 11.1% (S wave) impedance jumps at 410 km depth.

Original languageEnglish
Pages (from-to)98-104
Number of pages7
JournalPhysics of the Earth and Planetary Interiors
Volume174
Issue number1-4
DOIs
Publication statusPublished - 2009 May 1

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science

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