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Publication Detail
The effect of pressure on thermal diffusivity in pyroxenes
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Hunt SA, Walker AM, McCormack RJ, Dobson DP, Wills AS, Li L
  • Publisher:
    MINERALOGICAL SOC
  • Publication date:
    10/2011
  • Pagination:
    2597, 2610
  • Journal:
    MINERAL MAG
  • Volume:
    75
  • Issue:
    5
  • Print ISSN:
    0026-461X
  • Language:
    EN
  • Keywords:
    thermal diffusivity, X-radiographic imaging, pyroxenes, high pressure, multi-anvil, HIGH-TEMPERATURE, MANTLE MINERALS, CONDUCTIVITY, OLIVINE, ORTHOENSTATITE, JADEITE, DIFFRACTION, ENSTATITE, GARNET, GPA
  • Addresses:
    Hunt, SA
    SUNY Stony Brook
    Dept Earth & Space Sci
    Inst Mineral Phys
    Stony Brook
    NY
    11794
    USA
Abstract
The thermal diffusivity of diopside, jadeite and enstatite were measured at simultaneous pressures and temperatures of up to 7 GPa and 1200 K using the X-radiographic Angstrom method. The measurements herein show that the pressure dependency of thermal diffusivity in pyroxenes is significantly greater than in olivine or garnet and that in the MORB-layer of a subducting slab the thermal diffusivity of pyroxenes are a factor of 1.5 greater than that of olivine. The temperature dependence of all the data sets is well described by a low-order polynomial fit to 1/kappa and the pressure dependence is exponential in 1/kappa, formulations which are consistent with the damped harmonic oscillator model for thermal properties.
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