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Mutual interaction of redox pairs in silicate melts: Equilibria involving metallic phases

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Abstract

Mutual interaction of redox pairs resulting in the origin or decomposition of a metal phase is analyzed based on the concept of intrinsic oxygen fugacity. Reactions are suggested that may be responsible for the synthesis (or decomposition) of submicrometer-sized metal nuggets when experimental melts are quenched and can explain the possible crystallization of Pt—Fe alloys when basaltic melts cool and elucidate the nature of color of Au-bearing ruby glass. Possible disproportionation reactions of certain lower oxides into a higher oxide and respective metal in cooled silicate melts are discussed.

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Correspondence to A. A. Borisov.

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Original Russian Text © A.A. Borisov, 2016, published in Petrologiya, 2016, Vol. 24, No. 2, pp. 131–141.

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Borisov, A.A. Mutual interaction of redox pairs in silicate melts: Equilibria involving metallic phases. Petrology 24, 117–126 (2016). https://doi.org/10.1134/S0869591116020028

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