In situ X-ray observation of decomposition of superhydrous phase B at high pressure and temperature

Eiji Ohtani, Motomasa Toma, Tomoaki Kubo, Tadashi Kondo, Takumi Kikegawa

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36 Citations (Scopus)

Abstract

High pressure and high temperature in situ X-ray diffraction experiments on the stability of superhydrous phase B have been conducted to clarify the host of water in the slabs descending into the lower mantle. We observed the decomposition reaction of superhydrous phase B into phase G (= phase D and F), periclase, and MgSiO3 perovskite at around 700 ∼1100°C and above 30 GPa, and the boundary of the decomposition reaction can be expressed as P(GPa) = -0.0037(±0.0017)T(°C) + 32.2(±0.5). This reaction can occur in slabs descending into the uppermost part of the lower mantle.

Original languageEnglish
Pages (from-to)1-1 - 1-4
JournalGeophysical Research Letters
Volume30
Issue number2
DOIs
Publication statusPublished - 2003 Jan 15

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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