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Thickness and Clapeyron slope of the post-perovskite boundary

Author

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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)

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.

Suggested Citation

  • Krystle Catalli & Sang-Heon Shim & Vitali Prakapenka, 2009. "Thickness and Clapeyron slope of the post-perovskite boundary," Nature, Nature, vol. 462(7274), pages 782-785, December.
    • Handle: RePEc:nat:nature:v:462:y:2009:i:7274:d:10.1038_nature08598
    DOI: 10.1038/nature08598
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