Measurement of hydrous peridotite magma density at high pressure using the X-ray absorption method

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

The density of hydrous peridotite magma containing 5wt.% H $_{2}$ O was measured at pressures and temperatures up to 4.3 GPa and 2073 K, respectively, using the X-ray absorption method. A fit of pressure-density-temperature data to the high-temperature Birch-Murnagan equation of state yields isothermal bulk modulus $K_{T}=8.8pm 1.9$ GPa, its pressure derivative and the temperature derivative of the bulk modulus $(delta K_{T}/delta T)_{P}=-0.0022 pm 0.0015$ GPa/K at 1773K. The small bulk modulus of the hydrous peridotite magma compared with that of the dry peridotite magma reflects the effect of water, which is more compressible than the silicate melt.

Language	:	English
Journal	:	Earth and Planetary Science Letters
Volume	:	287
Number	:	3-4
Pages	:	p.293 - 297
Publication Year/Month	:	2009/10
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Paper URL	:	https://doi.org/10.1016/j.epsl.2009.07.030
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Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
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Registration No. : AA20100386
JAEA Abstracts No. : 38001283
Paper Submission No. : 7909

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