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High concentration of water in stishovite in the MORB system
Author(s) -
Chung Jung In,
Kagi Hiroyuki
Publication year - 2002
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 - 10.1029/2002gl015579
Subject(s) - stishovite , hydrogen , basalt , geochemistry , geology , mantle (geology) , crust , mineralogy , inorganic chemistry , chemistry , quartz , organic chemistry , paleontology
Stishovite synthesized from natural basalt showed the highest concentration of hydrogen ever reported. The water concentration obtained from the polished single crystal of stishovite in this study was up to a maximum of 5628 ± 291 atoms of hydrogen per 10 6 silicon atoms (844 ± 44 ppm water). The concentration of hydrogen increased with increasing substitution of trivalent cations, which is almost aluminum, and temperature has a significant effect on the incorporation of hydrogen into stishovite. The result of this study suggests that stishovite in subducted basaltic crust could be an important water‐containing phase and contribute to the transport of hydrogen to the lower mantle.