## Abstract

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 (∂K_{T}/∂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.

Original language | English |
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Pages (from-to) | 293-297 |

Number of pages | 5 |

Journal | Earth and Planetary Science Letters |

Volume | 287 |

Issue number | 3-4 |

DOIs | |

Publication status | Published - 2009 Oct 15 |

## Keywords

- density
- equation of state
- HO
- high pressure
- hydrous peridotite magma
- X-ray absorption method