Phase Relations in the Fe–S–C System at P = 0.5 GPa, T = 1100–1250°C: Fe–S–C Liquation and Its Role in the Formation of Magmatic Sulfide Deposits

• Published in: Doklady earth sciences 2021-03, Vol.497 (1), p.206-210
• Main Authors: Gorbachev, N. S., Shapovalov, Yu. B., Kostyuk, A. V., Gorbachev, P. N., Nekrasov, A. N., Soultanov, D. M.
• Format: Article
• Language: English
• Subjects: Chemical composition; Concentrates (ores); Contamination; Copper; Earth and Environmental Science; Earth Sciences; Fractionation; Geochemistry; Gold; Iron; Liquid phases; Liquids; Minerals; Nickel; Ores; Palladium; Platinum; Silicates; Silver; Sulfides; Sulphides
• ISSN: 1028-334X; 1531-8354
• DOI: 10.1134/S1028334X21030028

The liquid phases are represented by immiscible Fe–S and Fe–C melts under partial melting of the graphite-saturated Fe–S–C system at P = 0.5 GPa and T = 1150, 1200, and 1250°C. Fe, Ni, Pt, and Au are predominantly concentrated in the Fe–C melt, and Cu, Pd, and Ag occur in the Fe–S melt as a result of fractionation of elements between coexisting liquids. The features of the geological setting of the formation of magmatic sulfide deposits in the Norilsk region and the chemical composition of ores indicate the contamination of the Fe-sulfide melt with carbon with liquation into Fe–C and Fe–S liquids coexisting with the silicate melt. The enrichment of the ore-forming Fe-sulfide melt of Cu, Pd, and AgC is associated with the redistribution of ore-forming elements between them, thereby providing the Pd–Cu specialization of sulfide ores in the Norilsk region.