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The effect of pressure on thermal diffusivity in pyroxenes

Published online by Cambridge University Press:  05 July 2018

S. A. Hunt ,
A. M. Walker ,
R. J. McCormack ,
D. P. Dobson ,
A. S. Wills  and
L. Li
S. A. Hunt*
Affiliation:
Mineral Physics Institute, Department of Earth and Space Sciences, Stony Brook University, Stony Brook, NY 11794-2100, USA Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
A. M. Walker
Affiliation:
Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, UK
R. J. McCormack
Affiliation:
Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK
D. P. Dobson
Affiliation:
Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK
A. S. Wills
Affiliation:
Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
L. Li
Affiliation:
Mineral Physics Institute, Department of Earth and Space Sciences, Stony Brook University, Stony Brook, NY 11794-2100, USA
*
*E-mail: simon.hunt@ucl.ac.uk
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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 Ångström 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/K and the pressure dependence is exponential in 1/K, formulations which are consistent with the damped harmonic oscillator model for thermal properties.

Keywords

thermal diffusivityX-radiographic imagingpyroxeneshigh pressuremulti-anvil
Type
Research Article
Information
Mineralogical Magazine , Volume 75 , Issue 5 , October 2011 , pp. 2597 - 2610
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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