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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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
JournalGeophysical Research Letters
Volume30
Issue number2
DOIs
Publication statusPublished - Jan 15 2003
Externally publishedYes

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lower mantle
slab
decomposition
periclase
perovskite
Earth mantle
slabs
x rays
X-ray diffraction
experiment
diffraction
water
in situ
temperature

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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In situ X-ray observation of decomposition of superhydrous phase B at high pressure and temperature. / Ohtani, Eiji; Toma, Motomasa; Kubo, Tomoaki; Kondo, Tadashi; Kikegawa, Takumi.

In: Geophysical Research Letters, Vol. 30, No. 2, 15.01.2003.

Research output: Contribution to journalArticle

Ohtani, Eiji ; Toma, Motomasa ; Kubo, Tomoaki ; Kondo, Tadashi ; Kikegawa, Takumi. / In situ X-ray observation of decomposition of superhydrous phase B at high pressure and temperature. In: Geophysical Research Letters. 2003 ; Vol. 30, No. 2.
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