期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 287, 期 3-4, 页码 293-297出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2009.07.030
关键词
X-ray absorption method; hydrous peridotite magma; density; high pressure; equation of state; H(2)O
资金
- Ministry of Education, Culture, Sports, Science, and Technology of the Japanese Government [16340164, 13440163]
- Global Center of Excellence program of Earth and Planetary Science, Tohoku University, Japan
- Japan Society for the Promotion of Science for Young Scientists
- JAEA [2008A3722, 2008B3726]
- Grants-in-Aid for Scientific Research [16340164, 13440163] Funding Source: KAKEN
The density of hydrous peridotite magma containing 5 wt.% 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-Murnaghan equation of state yields isothermal bulk modulus K(T) = 8.8 +/- 1.9 GPa. its pressure derivative K' = 9.9 +/- 3.6 and the temperature derivative of the bulk modulus (partial derivative K(T)/partial derivative T)(p) = -0.0022 +/- 0.0015 GPa/K at 1773 K. 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. The partial molar volume of H(2)O in magma under high pressure conditions was calculated and fitted using the Vinet equation of state. The isothermal bulk modulus was K(T) = 2.4 +/- 1.0 GPa, and its pressure derivative was K' = 5.7 +/- 1.5 at 1973 K. (C) 2009 Elsevier B.V. All rights reserved.
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