Topology of the postperovskite phase transition and mantle dynamics

Marc Monnereau, David A. Yuen

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

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 (≈15 TW), whereas for 10 MPa/K the agreement is for a lower core heat flow (20%, ≈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.

Original languageEnglish (US)
Pages (from-to)9156-9161
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume104
Issue number22
DOIs
StatePublished - May 29 2007

Keywords

  • Clapeyron slope
  • D″ layer
  • Mantle convection
  • Spherical model
  • Temperature intercept

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