• journal_title：American Mineralogist
• Contributor：Tatsuya Sakamaki ; Eiji Ohtani ; Satoru Urakawa ; Akio Suzuki ; Yoshinori Katayama
• Publisher：Mineralogical Society of America
• Date：2010-
• Format：text/html
• Language：en
• Identifier：10.2138/am.2010.3143
• journal_abbrev：American Mineralogist
• issn：0003-004X
• volume：95
• issue：1
• firstpage：144
• section：Articles

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 ± 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.