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FeO activity and oxygen potential in magnesian magmas

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Abstract

An equation for the excess free energy of melts containing all major components is derived from published experimental data on equilibria between silicate liquids with either metallic iron or spinel at controlled oxygen partial pressure. The FeO activities in mafic and ultramafic magmas calculated with this equation were used to develop an oxygen barometer (geoxometer) for the association spinel + melt. Data derived with the application of the geoxometer confirm that meymechite magmas in the Siberian trap province had oxygen fugacities higher than in other magmatic systems. The origin of lower lithospheric domains with elevated redox potential can be explained by the intense diffusion of hydrogen from zones in which water-rich near-solidus melts from asthenospheric sources were emplaced into harzburgites, which had lost water and other incompatible elements in the course of earlier large-scale melting.

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Authors and Affiliations

  1. Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 109017, Russia

    I. D. Ryabchikov

  2. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia

    L. N. Kogarko

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  1. I. D. Ryabchikov
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Correspondence to I. D. Ryabchikov.

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Original Russian Text © I.D. Ryabchikov, L.N. Kogarko, 2013, published in Geokhimiya, 2013, Vol. 51, No. 12, pp. 1055–1065.

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Ryabchikov, I.D., Kogarko, L.N. FeO activity and oxygen potential in magnesian magmas. Geochem. Int. 51, 949–958 (2013). https://doi.org/10.1134/S0016702913120070

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  • DOI: https://doi.org/10.1134/S0016702913120070

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