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

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 stete 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.