Density of dry peridotite magma at high pressure using an X-ray absorption method

Tatsuya Sakamaki; Eiji Ohtani; Satoru Urakawa; Akio Suzuki; Yoshinori Katayama

doi:10.2138/am.2010.3143

Density of dry peridotite magma at high pressure using an X-ray absorption method

Tatsuya Sakamaki, Eiji Ohtani, Satoru Urakawa, Akio Suzuki, Yoshinori Katayama

SCI - Earth Science

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

33 Citations (Scopus)

Abstract

The density of a peridotite magma was measured up to 2.5 GPa and 2300 K using an X-ray absorption method. The method allowed measurement of the density of a peridotite melt under seven. different conditions and clarified the pressure and temperature dependence of the density. A fit of the pressure-density-temperature data to the high-temperature Birch-Murnaghan equation of stete yielded the isothermal bulk modulus, K_T0 = 24.0 ± 1.3 GPa, its pressure derivative, K₀′ = 7.3 ± 0.8, and the derivative of bulk modulus (∂K_T/∂T) _P= -0.0027 ± 0.0017 GPa/K at 2100 K. The large bulk modulus and its pressure derivative of the peridotite melt compared with that, of basaltic melt is consistent with previous results from sink-float experiments.

Original language	English
Pages (from-to)	144-147
Number of pages	4
Journal	American Mineralogist
Volume	95
Issue number	1
DOIs	https://doi.org/10.2138/am.2010.3143
Publication status	Published - 2010 Jan 1

Keywords

Density
Equation of state
High pressure
Peridotite melt
X-ray absorption method

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology

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AU - Sakamaki, Tatsuya

AU - Ohtani, Eiji

AU - Urakawa, Satoru

AU - Suzuki, Akio

AU - Katayama, Yoshinori

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N2 - The density of a peridotite magma was measured up to 2.5 GPa and 2300 K using an X-ray absorption method. The method allowed measurement of the density of a peridotite melt under seven. different conditions and clarified the pressure and temperature dependence of the density. A fit of the pressure-density-temperature data to the high-temperature Birch-Murnaghan equation of stete yielded the isothermal bulk modulus, KT0 = 24.0 ± 1.3 GPa, its pressure derivative, K0′ = 7.3 ± 0.8, and the derivative of bulk modulus (∂KT/∂T) P= -0.0027 ± 0.0017 GPa/K at 2100 K. The large bulk modulus and its pressure derivative of the peridotite melt compared with that, of basaltic melt is consistent with previous results from sink-float experiments.

AB - The density of a peridotite magma was measured up to 2.5 GPa and 2300 K using an X-ray absorption method. The method allowed measurement of the density of a peridotite melt under seven. different conditions and clarified the pressure and temperature dependence of the density. A fit of the pressure-density-temperature data to the high-temperature Birch-Murnaghan equation of stete yielded the isothermal bulk modulus, KT0 = 24.0 ± 1.3 GPa, its pressure derivative, K0′ = 7.3 ± 0.8, and the derivative of bulk modulus (∂KT/∂T) P= -0.0027 ± 0.0017 GPa/K at 2100 K. The large bulk modulus and its pressure derivative of the peridotite melt compared with that, of basaltic melt is consistent with previous results from sink-float experiments.

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