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First-principles constraints on diffusion in lower-mantle minerals and a weak D′′ layer

Author

Listed:
  • M. W. Ammann

    (University College London, Gower Street, London WC1E 6BT, UK)

  • J. P. Brodholt

    (University College London, Gower Street, London WC1E 6BT, UK)

  • J. Wookey

    (University of Bristol, Wills Memorial Building, Queens Road, Bristol BS6 6LL, UK)

  • D. P. Dobson

    (University College London, Gower Street, London WC1E 6BT, UK)

Abstract

Mantle convection Michael Ammann and colleagues have applied first-principle methods to calculate absolute diffusion rates in the mineral post-perovskite in the conditions prevailing in the Earth's lower mantle. They find that the diffusion of Mg2+ and Si4+ in post-perovskite is extremely anisotropic, with almost eight orders of magnitude difference between the fast and slow directions. This could render post-perovskite up to four orders of magnitude weaker than perovskite, and could reconcile seismic observations of a D′′ reflector with recent experiments showing that the width of the perovskite to post-perovskite transition is too wide to cause sharp reflectors.

Suggested Citation

  • M. W. Ammann & J. P. Brodholt & J. Wookey & D. P. Dobson, 2010. "First-principles constraints on diffusion in lower-mantle minerals and a weak D′′ layer," Nature, Nature, vol. 465(7297), pages 462-465, May.
    • Handle: RePEc:nat:nature:v:465:y:2010:i:7297:d:10.1038_nature09052
    DOI: 10.1038/nature09052
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    Cited by:

    1. Katsutoshi Kawano & Masayuki Nishi & Hideharu Kuwahara & Sho Kakizawa & Toru Inoue & Tadashi Kondo, 2024. "Extensive iron–water exchange at Earth’s core–mantle boundary can explain seismic anomalies," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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