Measurement of hydrous peridotite magma density at high pressure using the X-ray absorption method
Measurement of hydrous peridotite magma density at high pressure using the X-ray absorption method
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DOI：
10.1016/j.epsl.2009.07.030
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发表时间：
2009-10
影响因子：
5.3
通讯作者：
T. Sakamaki;E. Ohtani;S. Urakawa;A. Suzuki;Y. Katayama
中科院分区：
文献类型：
--
作者：
T. Sakamaki;E. Ohtani;S. Urakawa;A. Suzuki;Y. Katayama
用X射线吸收法测定了含5wt.%H2O的水合橄榄岩岩浆在4.3 GPa2073K的压力和温度下的密度。将压力-密度-温度数据与高温Birch-Murnaghan状态方程进行拟合，得到1773K时等温体弹性系数KT=8.80±1.9 GPa.压力导数K‘=9.9±3.6.体积弹性模量的温度导数(∂KT/∂T)P=−0.0022±0.0015 GPaK.与干燥橄榄岩岩浆相比，含水橄榄岩岩浆的体积模数较小，反映了水的影响，水比硅酸盐熔体更具可压缩性。利用维奈状态方程计算并拟合了高压条件下岩浆中H2O的偏摩尔体积。1973K时等温体弹性模量为KT=2.4±1.0 GPa，压力导数为K‘=5.7±1.5。
The density of hydrous peridotite magma containing 5wt.% H2O was measured at pressures and temperatures up to 4.3GPa and 2073K, 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 KT=8.8±1.9GPa, its pressure derivative K′=9.9±3.6 and the temperature derivative of the bulk modulus (∂KT/∂T)P=−0.0022±0.0015GPa/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. The partial molar volume of H2O in magma under high pressure conditions was calculated and fitted using the Vinet equation of state. The isothermal bulk modulus was KT=2.4±1.0GPa, and its pressure derivative was K′=5.7±1.5 at 1973K.