### Abstract

Elasticity of (Mg_{0.87}Fe_{0.13})_{2}SiO_{4} 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-(Mg_{0.9}Fe_{0.1})_{2}SiO_{4} 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 language | English |
---|---|

Pages (from-to) | 98-104 |

Number of pages | 7 |

Journal | Physics of the Earth and Planetary Interiors |

Volume | 174 |

Issue number | 1-4 |

DOIs | |

Publication status | Published - 2009 May 1 |

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### All Science Journal Classification (ASJC) codes

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

### Cite this

_{0.87}Fe

_{0.13})

_{2}SiO

_{4}wadsleyite to 12 GPa and 1073 K.

*Physics of the Earth and Planetary Interiors*,

*174*(1-4), 98-104. https://doi.org/10.1016/j.pepi.2008.10.020

}

_{0.87}Fe

_{0.13})

_{2}SiO

_{4}wadsleyite to 12 GPa and 1073 K',

*Physics of the Earth and Planetary Interiors*, vol. 174, no. 1-4, pp. 98-104. https://doi.org/10.1016/j.pepi.2008.10.020

**Elasticity of (Mg _{0.87}Fe_{0.13})_{2}SiO_{4} wadsleyite to 12 GPa and 1073 K.** / Liu, Wei; Kung, Hui-Chen; Li, Baosheng; Nishiyama, Nori; Wang, Yanbin.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Elasticity of (Mg0.87Fe0.13)2SiO4 wadsleyite to 12 GPa and 1073 K

AU - Liu, Wei

AU - Kung, Hui-Chen

AU - Li, Baosheng

AU - Nishiyama, Nori

AU - Wang, Yanbin

PY - 2009/5/1

Y1 - 2009/5/1

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.

UR - http://www.scopus.com/inward/record.url?scp=67349282296&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=67349282296&partnerID=8YFLogxK

U2 - 10.1016/j.pepi.2008.10.020

DO - 10.1016/j.pepi.2008.10.020

M3 - Article

VL - 174

SP - 98

EP - 104

JO - Physics of the Earth and Planetary Interiors

JF - Physics of the Earth and Planetary Interiors

SN - 0031-9201

IS - 1-4

ER -

_{0.87}Fe

_{0.13})

_{2}SiO

_{4}wadsleyite to 12 GPa and 1073 K. Physics of the Earth and Planetary Interiors. 2009 May 1;174(1-4):98-104. https://doi.org/10.1016/j.pepi.2008.10.020