Stability of phase B, A hydrous magnesium silicate, to 2300°C at 20 GPA

Takumi Kato, Mineo Kumazaw

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17 Citations (Scopus)


The stability of phase B, hydrous magnesium silicate (Mg23Si8O42H6), has been investigated experimentally up to 20 GPa and 2500°C. Phase B is synthesized by heating a powder mixture of forsterite and periclase under hydrous conditions at pressures above 15 GPa, and temperatures above 1500°C, and is stable up to its incongruent melting temperature (2300°C at 20 GPa), above which it decomposes into an assemblage of liquid and periclase. The remarkable stability of phase B indicates the possibility of its presence as a host for H2O in the deep upper mantle of the Earth.

Original languageEnglish
Pages (from-to)534-535
Number of pages2
JournalGeophysical Research Letters
Issue number8
Publication statusPublished - Jan 1 1985

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)


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