Solubility of water in the alpha, beta and gamma phases of (Mg,Fe)2SiO4
Article Abstract:
The solubility of hydroxyl in the beta and gamma phases of (Mg,Fe)2SiO4 in hydrothermally annealed San Carlos olivine crystals is 24,000 and 27,000 wt ppm H2O respectively. The solubility is 1200 wt ppm H2O in the alpha phase. An increase in pressure in the alpha phase increases water fugacity which increases solubility. The high solubility in the beta phase shows that mineral olivine can store all the water present in the upper mantle. A free hydrous fluid phase is instable in the presence of normal hydrogen levels and exists only in certain places such as a mantle wedge above a subduction zone.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1996
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Phosphorus solubility mechanisms in haplogranitic aluminosilicate glass and melt: effect of temperature and aluminum content
Article Abstract:
The structure of phosphorus-bearing melts and glasses with alkali/alumina ration ranging from Al-free to peraluminous (alkali/alumino <1) was examined as a function of temperature and Al2O3 content using microRaman spectroscopy. Findings show that with increasing Al content, the proportion of P2O7 initially increases relative to PO4. When P-bearing peralkaline silicate and aluminosilicate glasses are transformed to supercooled melts, there is a rapid decrease in PO4/P2O7 leading to depolymerization of silicate melts. Temperature has no effect on the solution mechanism.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
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Modeling of the solubility of a one-component H20 or C02 fluid in silicate liquids
Article Abstract:
A thermodynamic model of the solubility of water and carbon dioxide in silicate liquids is developed. Mechanical, thermal and chemical equilibrium between the liquid magma and gas phase is assumed. The liquid phase is defined by a mixture of silicate components with H2O or CO2 while the gas phase is treated as pure H2O or CO2. It is shown that model results agree well with experimental results.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1997
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