Discovery of post-perovskite phase transition in MgSiO3 and the earth's lowermost mantle

Kei Hirose, Katsuyuki Kawamura

Research output: Contribution to journalReview article

Abstract

MgSiO3 perovskite is believed to be a dominant mineral at least in the upper part of the Earth's lower mantle, but its stability and possible phase transition in deeper levels were not known. Recently we discovered the phase transition from MgSiO3 perovskite to a new high-pressure form (space group: Cmcm) above 125 GPa and 2500 K on the basis of in-situ x-ray diffraction measurements [1]. This phase transition is most likely responsible for the origin of the D" seismic discontinuity observed around 2700 km depth, and the MgSiO3 post-perovskite phase is a main constituent mineral in the D" region. Here we introduce the details of high-pressure experiment and crystal structure determination, and discuss the seismic anomalies in the lowermost mantle.

Original languageEnglish
Pages (from-to)265-274
Number of pages10
JournalReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Volume14
Issue number3
DOIs
Publication statusPublished - Jan 1 2004

Keywords

  • Crystal structure analysis
  • D" seismic discontinuity
  • Leaser-heated diamond-anvil cell
  • Lower mantle
  • MgSiO
  • Phase boundary
  • Post-perovskite phase
  • Ultra high pressure

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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