Colloform high-purity platinum from the placer deposit of Koura River (Gornaya Shoriya,Russia) |
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| Affiliation: | 1. Eötvös University, Dept. Petrology and Geochemistry, 1117 Budapest, Pázmány P. s. 1/c, Hungary;2. Research Center for Astronomy and Geosciences, Geobiomineralization and Astrobiological Research Group, Institute for Geology and Geochemistry, Hungarian Academy of Sciences, 1112 Budapest, Budaörsi út. 45, Hungary;3. Eszterházy Károly University, Dept. of Natural Geography and Geoinformatics, 3300 Eger, Leányka str. 6/C, Hungary;4. USGS, 2885 Mission St., Santa Cruz, CA 95060, USA;5. Szeged University, Dept. of Mineralogy, Geochemistry and Petrology, 6722 Szeged, Egyetem, str. 2-6, Hungary;6. Eszterházy Károly University, Regional Research Centre, 3300 Eger, Leányka str. 6/G, Hungary;7. Eszterházy Károly University, Food Science Institute, 3300 Eger, Leányka Str. 6, Hungary;8. Mangán Ltd., Úrkút, Külterület 1, 8409, Hungary |
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| Abstract: | A microinclusion of colloform high-purity platinum in a grain of platinum-group minerals (PGM) from the alluvial gold-bearing placer deposit in the south of Western Siberia (Russia) was detected and characterized for the first time. It is different in composition, texture, and conditions of formation from high-purity platinum of other regions described in the literature. The main characteristics of investigated high-purity platinum are colloform-layered texture, admixture of Fe (0.37–0.78 wt%), and paragenesis of Cu-rich isoferroplatinum, hongshiite, and rhodarsenide. The PGM grain with high-purity platinum is multiphase and heterogeneous in texture. It is a product of intensive metasomatic transformation of Cu-rich isoferroplatinum (Pt3(Fe0.6Cu0.4)). The transformation was carried out in two stages: 1 – copper stage including three substages (Cu-rich isoferroplatinum, copper platinum and hongshiite); and 2 – arsenic (rhodarsenide). The formation of high-purity platinum was separated in time from the formation of isoferroplatinum and was carried out by precipitation from postmagmatic solutions. |
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| Keywords: | Platinum-group elements (PGE) Platinum-group minerals (PGM) High-purity platinum Cu-rich isoferroplatinum Hongshiite Alluvial placer Gornaya Shoriya |
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