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The effect of dissolved water on the oxidation state of iron in natural silicate liquids

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Abstract

Ferric-ferrous ratios have been measured in 22 experiments on three natural compositions equilibrated at known temperature (950°–1100° C) and oxygen fugacity, and at water-saturated conditions over a pressure range from 0.05 to 0.2 GPa. There does not appear to be any reaction between the melt and the capsule material that affects the redox state of the iron in the melt. An empirical expression for the anhydrous behavior of the redox state of iron in each of these compositions has also been determined at 1 bar as a function of temperature and oxygen fugacity. A direct comparison of the hydrous ferric-ferrous values with the calculated anhydrous values shows that the dissolution of water in a per-alkaline rhyolite, andesite, and an augite minette has no effect on the redox state of the iron in these melts. This result parallels the effect of water on sulfide speciation in basaltic melts, and confirms published results on experimental hydrous basalts.

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  1. Department of Geology and Geophysics, University of California, 94720, Berkeley, CA, USA

    Gordon Moore, Kevin Righter & I. S. E. Carmichael

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  1. Gordon Moore
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  2. Kevin Righter
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  3. I. S. E. Carmichael
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Moore, G., Righter, K. & Carmichael, I.S.E. The effect of dissolved water on the oxidation state of iron in natural silicate liquids. Contrib Mineral Petrol 120, 170–179 (1995). https://doi.org/10.1007/BF00287114

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