Post-perovskite phase transition and mineral chemistry in the pyrolitic lowermost mantle

Motohiko Murakami, Kei Hirose, Nagayoshi Sata, Yasuo Ohishi

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181 Citations (Scopus)


Phase relations of a natural mantle Composition were determined up to 126 GPa and 2450 K by in-situ x-ray diffraction measurements in a laser-heated diamond-anvil cell (LHDAC). MgSiO3-rich perovskite (MgPv) transforms to a post-perovskite phase (MgPP) at about 113 GPa and 2500 K (400-km above the core-mantle boundary) and the lowermost mantle consists of MgPP, (Mg, Fe)O magnesiowüstite (Mw), and CaSiO3-rich perovskite (CaPv). Chemical analyses on recovered samples using transmission electron microscope (TEM) show that the distribution of iron significantly changes at the post-perovskite phase transition. A strong enrichment of iron in Mw leads to the unique geophysical and geochemical properties of the lowermost mantle.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Issue number3
Publication statusPublished - 2005 Feb 16
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)


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