Measurement of hydrous peridotite magma density at high pressure using the X-ray absorption method

Tatsuya Sakamaki, Eiji Ohtani, Satoru Urakawa, Akio Suzuki, Yoshinori Katayama

Research output: Contribution to journalArticle

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Abstract

The density of hydrous peridotite magma containing 5 wt.% H2O 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 KT = 8.8 ± 1.9 GPa, its pressure derivative K′ = 9.9 ± 3.6 and the temperature derivative of the bulk modulus (∂KT/∂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 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 ± 1.0 GPa, and its pressure derivative was K′ = 5.7 ± 1.5 at 1973 K.

Original languageEnglish
Pages (from-to)293-297
Number of pages5
JournalEarth and Planetary Science Letters
Volume287
Issue number3-4
DOIs
Publication statusPublished - Oct 15 2009

Fingerprint

bulk modulus
peridotite
X ray absorption
magma
Elastic moduli
equation of state
Derivatives
x rays
equations of state
Equations of state
temperature
silicate melt
Silicates
Temperature
silicates
Density (specific gravity)
method
Water
water

Keywords

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

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Measurement of hydrous peridotite magma density at high pressure using the X-ray absorption method. / Sakamaki, Tatsuya; Ohtani, Eiji; Urakawa, Satoru; Suzuki, Akio; Katayama, Yoshinori.

In: Earth and Planetary Science Letters, Vol. 287, No. 3-4, 15.10.2009, p. 293-297.

Research output: Contribution to journalArticle

Sakamaki, Tatsuya ; Ohtani, Eiji ; Urakawa, Satoru ; Suzuki, Akio ; Katayama, Yoshinori. / Measurement of hydrous peridotite magma density at high pressure using the X-ray absorption method. In: Earth and Planetary Science Letters. 2009 ; Vol. 287, No. 3-4. pp. 293-297.
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