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Published online on May 3, 2007, 10.1073/pnas.0608480104
PNAS | May 29, 2007 | vol. 104 | no. 22 | 9156-9161


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High-Pressure Geoscience Special Feature
HIGH-PRESSURE GEOSCIENCE SPECIAL FEATURE / PHYSICAL SCIENCES / RESEARCH ARTICLES / GEOPHYSICS
Topology of the postperovskite phase transition and mantle dynamics

Marc Monnereau*,{dagger} and David A. Yuen{ddagger}

*Unité Mixte de Recherche 5562, Centre National de la Recherche Scientifique–Université Paul Sabatier Toulouse III, 14 Avenue Edouard Belin, 31400 Toulouse, France; and {ddagger}Department of Geology and Geophysics and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455-0219

Edited by Russell J. Hemley, Carnegie Institution of Washington, Washington, DC, and approved March 30, 2007 (received for review September 16, 2006)

The postperovskite (ppv) phase transition occurs in the deep mantle close to the core–mantle boundary (CMB). For this reason, we must include in the dynamical considerations both the Clapeyron slope and the temperature intercept, Tint, which is the temperature of the phase transition at the CMB pressure. For a CMB temperature greater than Tint, there is a double crossing of the phase boundary by the geotherms associated with the descending flow. We have found a great sensitivity of the shape of the ppv surface due to the CMB from variations of various parameters such as the amount of internal heating, the Clapeyron slope, and the temperature intercept. Three-dimensional spherical models of mantle convection that can satisfy the seismological constraints depend on the Clapeyron slope. At moderate value, 8 MPa/K, the best fit is found with a core heat flow amounting for 40% of the total heat budget ({approx}15 TW), whereas for 10 MPa/K the agreement is for a lower core heat flow (20%, {approx}7.5 TW). In all cases, these solutions correspond to a temperature intercept 200 K lower than the CMB temperature. These models have holes of perovskite adjacent to ppv in regions of hot upwellings.

D'' layer | Clapeyron slope | temperature intercept | mantle convection | spherical model

Author contributions: M.M. and D.A.Y. designed research; M.M. performed research; and M.M. and D.A.Y. wrote the paper.

The authors declare no conflict of interest.

This article is a PNAS Direct Submission.

{dagger}To whom correspondence should be addressed. E-mail: marc.monnereau{at}dtp.obs-mip.fr

© 2007 by The National Academy of Sciences of the USA


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