Thickness and Clapeyron slope of the post-perovskite boundary

Krystle Catalli, Sang-Heon Shim () and Vitali Prakapenka
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Krystle Catalli: Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
Sang-Heon Shim: Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
Vitali Prakapenka: GeoSoilEnviroCARS, University of Chicago, Chicago, Illinois 60637, USA

Nature, 2009, vol. 462, issue 7274, 782-785

Abstract: The core-mantle boundary: digging deep for D′′ Krystle Catalli and colleagues report the thickness of the post-perovskite boundary determined in the laser-heated diamond-anvil cell at in situ high pressure and temperature conditions. Their measured Clapeyron slope is consistent with the D′′ discontinuity observed seismically, however their estimate of the post-perovskite boundary thickness is 400¬600 km, which is substantially larger than the observed thickness of less than 30 km. They predict that the post-perovskite boundary will be particularly thick in regions with elevated aluminium content and/or low Mg/Si ratio, reducing the effects of the large positive Clapeyron slope on the buoyancy of thermal anomalies and stabilizing compositional heterogeneities in the lowermost mantle. If the post-perovskite transition is the source of the D′′ discontinuity, regions with sharp discontinuities may require distinct compositions, such as a higher Mg/Si ratio or low aluminium content.

Date: 2009
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DOI: 10.1038/nature08598

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