The effect of pressure on thermal diffusivity in pyroxenes

SA Hunt, AM Walker, R McCormack, DP Dobson, AS Wills, L Li

Research output: Contribution to journalArticle (Academic Journal)

9 Citations (Scopus)

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/k and the pressure dependence is exponential in 1/k, formulations which are consistent with the damped harmonic oscillator model for thermal properties.
Translated title of the contributionThe effect of pressure on thermal diffusivity in pyroxenes
Original languageEnglish
Pages (from-to)2597 - 2610
Number of pages13
JournalMineralogical Magazine
Volume75
DOIs
Publication statusPublished - Oct 2011

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