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

Sakamaki, Tatsuya*; Otani, Eiji*; Urakawa, Satoru*; Suzuki, Akio*; Katayama, Yoshinori

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 state yielded the isothermal bulk modulus, $K_{T0} = 24.0 pm 1.3$ GPa, its pressure derivative, $K'_{0} = 7.3 pm 0.8$ , and the derivative of bulk modulus $(delta K_{T}/delta T)_{P} = -0.0027 pm 0.0017$ 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.

Language	:	English
Journal	:	American Mineralogist
Volume	:	95
Number	:	1
Pages	:	p.144 - 147
Publication Year/Month	:	2010/01
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Paper URL	:	https://doi.org/10.2138/am.2010.3143
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Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
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Registration No. : AA20100387
JAEA Abstracts No. : 38001280
Paper Submission No. : 7906

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