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- W2053051490 abstract "The simplest possible aqueous vapor evolved from an iron-bearing magma under normal conditions is an H2O-H2 mixture. Hydrogen is produced by the oxidation of Fe(II) to Fe(III) by water in the magma yielding an increase in fo2. Equations are derived which model this mass transfer process. The resulting differential equation expresses the change in magmatic fo2 as a function of a change in N1h2O, the vapor evolution progress variable. The calculations demonstrate that in this simple scheme, very iron-poor magmas (H2OFeO < 10) are required to produce significant increases in magmatic fo2. The incremental increase in o2 during vapor evolution becomes progressively smaller as o2 increases, with this process becoming highly inefficient as the hematite stability field is approached. Other more complete processes involving meteoric water, assimilation of altered rocks and subsolidus processes may produce the observed increase in fo2 inferred to have occurred in systems of normal iron contents. In low-iron systems such as the high silica rhyolitic magmas associated with Climax-type porphyry molybdenum systems, high oxygen fugacities may be obtained by this mechanism." @default.
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- W2053051490 date "1986-06-01" @default.
- W2053051490 modified "2023-10-02" @default.
- W2053051490 title "The evolution of aqueous vapor from silicate melts: Effect on oxygen fugacity" @default.
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- W2053051490 doi "https://doi.org/10.1016/0016-7037(86)90403-5" @default.
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