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Nature 434, 834-835 (14 April 2005) | doi:10.1038/434834a; Published online 13 April 2005

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Geophysics:  Double-crossed again

Michael E. Wysession1 & Viatcheslav S. Solomatov1

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An idea that a mineral phase transition may occur not once, but twice, close to the core–mantle boundary has been tested with seismic data. The resulting picture of the deep Earth is sure to provoke debate.

Thermal boundary layers within planets act like thermal bottlenecks, controlling the rate at which heat escapes from the planet and regulating much of its internal behaviour. In the solid Earth, there are two major thermal boundary layers: the lithosphere at the top of Earth's mantle, and the D" layer at the bottom of the mantle.

  1. Michael E. Wysession and Viatcheslav S. Solomatov are in the Department of Earth and Planetary Sciences, Washington University, St Louis, Missouri 63130, USA.
    e-mail: Email: michael@mantle.wustl.edu

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