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Stability of phase B, A hydrous magnesium silicate, to 2300°C at 20 GPA
Author(s) -
Kato Takumi,
Kumazaw Mineo
Publication year - 1985
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl012i008p00534
Subject(s) - periclase , forsterite , silicate , magnesium , phase (matter) , mineralogy , geology , earth (classical element) , melting temperature , mantle (geology) , materials science , analytical chemistry (journal) , geochemistry , chemical engineering , chemistry , metallurgy , composite material , physics , organic chemistry , engineering , mathematical physics , chromatography
The stability of phase B, hydrous magnesium silicate (Mg 23 Si 8 O 42 H 6 ), 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 H 2 O in the deep upper mantle of the Earth.
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