On the increase in thermal diffusivity caused by the perovskite to post-perovskite phase transition and its implications for mantle dynamics

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

Research output: Contribution to journalArticle (Academic Journal)peer-review

27 Citations (Scopus)

Abstract

The thermal diffusivity (κ) of perovskite and post-perovskite CaIrO3 has been measured, at elevated pressure and temperatures up to 600 °C, using the X-radiographic Ångström method. At high temperatures we find that the thermal diffusivity of post-perovskite is slightly below twice that of isochemical perovskite over the temperature range investigated. Assuming a similar effect occurs in MgSiO3 post-perovskite, the effect of the contrasting thermal transport properties between perovskite and post-perovskite on mantle dynamics has been investigated using simple two-dimensional convection models. These show a reduction in extent and increase in depth of post-perovskite lenses, as well as increased core–mantle-boundary heat-flux, broader upwellings and more vigorous downwellings when compared to the reference, constant a, case.
Translated title of the contributionOn the increase in thermal diffusivity caused by the perovskite to post-perovskite phase transition and its implications for mantle dynamics
Original languageEnglish
Pages (from-to)96 - 105
Number of pages10
JournalEarth and Planetary Science Letters
Volume319-320
DOIs
Publication statusPublished - Jan 2012

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