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Publication Detail
On the increase in thermal diffusivity caused by the perovskite to post-perovskite phase transition and its implications for mantle dynamics
The thermal diffusivity (κ) of perovskite and post-perovskite CaIrO 3 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 MgSiO 3 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. © 2011 Elsevier B.V.
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