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

Wei Liu, Hui-Chen Kung, Baosheng Li, Nori Nishiyama, Yanbin Wang

Research output: Contribution to journalArticle

28 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

Fingerprint

wadsleyite
elasticity
olivine
elastic properties
impedance
elastic modulus
interferometry
P-wave
S-wave
upper mantle
discontinuity
acoustics
acoustic impedance
P waves
S waves
modulus of elasticity
synchrotrons
Earth mantle
ultrasonics
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Liu, Wei ; Kung, Hui-Chen ; Li, Baosheng ; Nishiyama, Nori ; Wang, Yanbin. / Elasticity of (Mg0.87Fe0.13)2SiO4 wadsleyite to 12 GPa and 1073 K. In: Physics of the Earth and Planetary Interiors. 2009 ; Vol. 174, No. 1-4. pp. 98-104.
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Elasticity of (Mg0.87Fe0.13)2SiO4 wadsleyite to 12 GPa and 1073 K. / Liu, Wei; Kung, Hui-Chen; Li, Baosheng; Nishiyama, Nori; Wang, Yanbin.

In: Physics of the Earth and Planetary Interiors, Vol. 174, No. 1-4, 01.05.2009, p. 98-104.

Research output: Contribution to journalArticle

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AU - Liu, Wei

AU - Kung, Hui-Chen

AU - Li, Baosheng

AU - Nishiyama, Nori

AU - Wang, Yanbin

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N2 - 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.

AB - 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.

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