Other
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1205c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 6, pp.1205-1211
Other
15
Scientific paper
The simplest possible aqueous vapor evolved from an iron-bearing magma under normal conditions is an H 2 O-H 2 mixture. Hydrogen is produced by the oxidation of Fe(II) to Fe(III) by water in the magma yielding an increase in f o 2 . Equations are derived which model this mass transfer process. The resulting differential equation expresses the change in magmatic f o 2 as a function of a change in N 1 h 2 O , the vapor evolution progress variable. The calculations demonstrate that in this simple scheme, very iron-poor magmas ( H 2 O / FeO < 10) are required to produce significant increases in magmatic f o 2 . The incremental increase in o 2 during vapor evolution becomes progressively smaller as o 2 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 f o 2 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.
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