Solubility of hydrogen and ferric iron in rutile and TiO2 (II): Implications for phase assemblages during ultrahigh-pressure metamorphism and for the stability of silica polymorphs in the lower mantle

Details Solubility of hydrogen and ferric iron in rutile and TiO2 (II): Implications for phase assemblages during ultrahigh-pressure metamorphism and for the stability of silica polymorphs in the lower mantle Solubility of hydrogen and ferric iron in rutile and TiO2 (II): Implications for phase assemblages during ultrahigh-pressure metamorphism and for the stability of silica polymorphs in the lower mantle

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3104610b&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 4, CiteID L04610

Physics

9

Mineralogy And Petrology: Crystal Chemistry, Mineral Physics: Defects, Mineral Physics: High-Pressure Behavior, Mineral Physics: Optical, Infrared, And Raman Spectroscopy, Tectonophysics: Planetary Interiors (5430, 5724)

Scientific paper

The solubility of hydrogen in Fe2O3-doped rutile and TiO2 (II) at 1100°C has been experimentally determined. H incorporation in rutile is coupled to substitution of Fe3+ onto the octahedral Ti4+ site. In contrast, TiO2 (II) contains no structurally-incorporated hydrogen. The dominant Fe3+ incorporation mechanism in both phases is unrelated to H content, and involves substitution of Fe3+ onto octahedral Ti4+ sites, charge-balanced by oxygen vacancies. Substitution of Fe2O3 into TiO2 (II) stabilizes the structure to much lower pressures than in the pure TiO2 system. Results indicate that Al-bearing stishovite could act as an important carrier of water in subducting oceanic crust, but that formation of the post-stishovite phase with the α-PbO2 structure would represent a significant dehydration event at the base of the lower mantle.

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