Computer Science
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012e%26psl.319...96h&link_type=abstract
Earth and Planetary Science Letters, Volume 319, p. 96-103.
Computer Science
Scientific paper
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.
Davies Rhodri D.
Dobson David P.
Hunt Simon A.
Li Li
McCormack Richard J.
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