Temperature derivatives of elastic moduli of MgSiO3 perovskite

Yoshitaka Aizawa; Akira Yoneda; Tomoo Katsura; Eiji Ito; Toshiaki Saito; Isao Suzuki

doi:10.1029/2003GL018762

Temperature derivatives of elastic moduli of MgSiO₃ perovskite

Yoshitaka Aizawa, Akira Yoneda, Tomoo Katsura, Eiji Ito, Toshiaki Saito, Isao Suzuki

Institute for Planetary Materials

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

Elastic properties of polycrystalline MgSiO₃ perovskite were determined by means of resonance sphere technique at temperatures from 258 to 318 K under atmospheric pressure. The temperature derivatives of adiabatic bulk (∂K_S/∂T)P and shear moduli (∂G/∂T)P are -0.029(2) GPa/K and -0.024(1) GPa/K, respectively. Applying the present results in interpretation of seismological observations, we suggest that the chemical composition of the earth's lower mantle is pyrolitic at the potential temperature of 1600 K.

Original language	English
Pages (from-to)	L01602 1-4
Journal	Geophysical Research Letters
Volume	31
Issue number	1
DOIs	https://doi.org/10.1029/2003GL018762
Publication status	Published - Jan 16 2004

ASJC Scopus subject areas

Geophysics
Earth and Planetary Sciences(all)

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AU - Aizawa, Yoshitaka

AU - Yoneda, Akira

AU - Katsura, Tomoo

AU - Ito, Eiji

AU - Saito, Toshiaki

AU - Suzuki, Isao

PY - 2004/1/16

Y1 - 2004/1/16

N2 - Elastic properties of polycrystalline MgSiO3 perovskite were determined by means of resonance sphere technique at temperatures from 258 to 318 K under atmospheric pressure. The temperature derivatives of adiabatic bulk (∂KS/∂T)P and shear moduli (∂G/∂T)P are -0.029(2) GPa/K and -0.024(1) GPa/K, respectively. Applying the present results in interpretation of seismological observations, we suggest that the chemical composition of the earth's lower mantle is pyrolitic at the potential temperature of 1600 K.

AB - Elastic properties of polycrystalline MgSiO3 perovskite were determined by means of resonance sphere technique at temperatures from 258 to 318 K under atmospheric pressure. The temperature derivatives of adiabatic bulk (∂KS/∂T)P and shear moduli (∂G/∂T)P are -0.029(2) GPa/K and -0.024(1) GPa/K, respectively. Applying the present results in interpretation of seismological observations, we suggest that the chemical composition of the earth's lower mantle is pyrolitic at the potential temperature of 1600 K.

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