Phase relationships and distribution of S, Fe, Co, Ni, Re, Os, Pt between metal and sulfide melts in basalt–Fe–FeS–C system at 1400°C, 4 GPa

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Abstract

The layering of Fe–FeS–C melt into Fe-metallic (Mc) and Fe-sulfide (Ms) liquids has been studied in the basalt–Fe–FeS–C system at 4 GPa, 1400°C. The partition and distribution coefficients of S, Fe, Co, Ni, Re, Os, Pt between Mc and Ms melts were determined. The partition coefficients D served as indicators of siderophilic and chalcophilic properties of each element, and Kd characterised their interelemental ratios during fractionation. In the Fe–Os–Co–Re series with D >1, siderophilic properties prevail, which increase with increasing values of the partition coefficients: 1.2–1.5–1.6–12.6. In the Ni–Pt–S series with D <1, chalcophilic properties prevail, which increase with decreasing D: 0.9–0.6–0.1. The values of the distribution coefficients Kd Re/Os (8.4) and Pt/Os (0.4) indicate the fractionation of Re and Pt relative to Os, with enrichment of rhenium in metallic and platinum in sulfide melt; the shift in the fractionation of Re/Os and Pt/Os relations and related systems of 187Re/187Os and 190Pt/186Os isotopes.

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About the authors

N. S. Gorbachev

D.S. Korzhinskii Institute of Experimental Mineralogy the Russian Academy of Sciences

Author for correspondence.
Email: gor@iem.ac.ru
Russian Federation, Chernogolovka, Moscow Region

Yu. B. Shapovalov

D.S. Korzhinskii Institute of Experimental Mineralogy the Russian Academy of Sciences

Email: gor@iem.ac.ru

Corresponding Member of the RAS

Russian Federation, Chernogolovka, Moscow Region

A. V. Kostyuk

D.S. Korzhinskii Institute of Experimental Mineralogy the Russian Academy of Sciences

Email: gor@iem.ac.ru
Russian Federation, Chernogolovka, Moscow Region

P. N. Gorbachev

D.S. Korzhinskii Institute of Experimental Mineralogy the Russian Academy of Sciences

Email: gor@iem.ac.ru
Russian Federation, Chernogolovka, Moscow Region

A. N. Nekrasov

D.S. Korzhinskii Institute of Experimental Mineralogy the Russian Academy of Sciences

Email: gor@iem.ac.ru
Russian Federation, Chernogolovka, Moscow Region

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Supplementary files

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2. Fig. 1. Backscattered electron micrographs of the silicate portion of the experimental sample: (a) Grt–Cpx matrix with intergranular glass (L1); (b) massive injection melt glass precipitates (L2) in the ore portion.

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3. Fig. 2. Backscattered electron micrograph of the contact zone of Grt–Cpx restite with isolated sulfide inclusions.

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4. Fig. 3. Micrograph in reflected electrons of massive sulfides with inclusions of single-phase and polyphase Fe-metallic globules: 1 – quenched sulfide matrix, 2 – single-phase Fe-metallic globules, 3 – polyphase Fe-metallic globules.

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