Thermal diffusivity, thermal conductivity and heat capacity of serpentine (antigorite) under high pressure

M. Osako, A. Yoneda, E. Ito, Daisuke Suetsugu, Craig Bina, Toru Inoue, Douglas Wiens, Mark Jellinek

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31 Citations (Scopus)

Abstract

Thermal diffusivity and thermal conductivity of serpentine (antigorite) were measured up to 8.5GPa and 800K in the Kawai-type high-pressure apparatus. Antigorite has thermal diffusivity of 0.90×10-6m2s-1 and thermal conductivity of 2.7Wm-1K-1 at 5GPa and 300K, which are much lower than those of olivine. Furthermore, the pressure derivatives of thermal diffusivity and thermal conductivity are significantly smaller than those of olivine. The thermal properties of antigorite obtained in the present study imply existence of a thermal insulating layer in subduction zones. From the simultaneous measurement of both thermal diffusivity and thermal conductivity the heat capacity of antigorite was determined to be ≈1×103Jkg-1K-1, and increased to ≈1.5×103Jkg-1K-1 at ≈800K under high pressure. The heat capacity was nearly independent of pressure, which indicates nearly temperature-independent thermal expansivity of antigorite. Its characteristics also were hypothesized in terms of lattice dynamics of hydrous minerals involving hydrogen atoms and hydroxyl groups.

Original languageEnglish
Pages (from-to)229-233
Number of pages5
JournalPhysics of the Earth and Planetary Interiors
Volume183
Issue number1-2
DOIs
Publication statusPublished - Nov 2010

Keywords

  • Heat capacity
  • Serpentine
  • Subduction zone
  • Thermal conductivity
  • Thermal diffusivity

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science

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