Determination of post-perovskite phase transition boundary up to 4400 K and implications for thermal structure in D″ layer

Shigehiko Tateno, Kei Hirose, Nagayoshi Sata, Yasuo Ohishi

Research output: Contribution to journalArticle

106 Citations (Scopus)

Abstract

We have determined the post-perovskite phase transition boundary in MgSiO3 in a wide temperature range from 1640 to 4380 K at 119-171 GPa on the basis of synchrotron X-ray diffraction measurements in-situ at high-pressure and -temperature in a laser-heated diamond-anvil cell (LHDAC). The results show a considerably high positive Clapeyron slope of + 13.3 ± 1.0 MPa/K and a transition temperature of about 3520 ± 70 K at the core-mantle boundary (CMB) pressure. The thermal structure in D″ layer can be tightly constrained from precisely determined post-perovskite phase transition boundary and the depths of paired seismic discontinuities. These suggest that temperature at the CMB may be around 3700 K, somewhat lower than previously thought. A minimum bound on the global heat flow from the core is estimated to be 6.6 ± 0.5 TW.

Original languageEnglish
Pages (from-to)130-136
Number of pages7
JournalEarth and Planetary Science Letters
Volume277
Issue number1-2
DOIs
Publication statusPublished - Jan 15 2009

Keywords

  • core-mantle boundary
  • in-situ X-ray diffraction
  • lower mantle
  • phase transition
  • post-perovskite

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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