MORPHOLOGY, COMPOSITION, AND ONTOGENESIS OF PLATINUM-GROUP MINERALS IN CHROMITITES OF ZONED CLINOPYROXENITE-DUNITE MASSIFS THE MIDDLE URALS
S.Yu. Stepanov1, R.S. Palamarchuk2, A.V. Antonov3, A.V. Kozlov2, D.A. Varlamov4, D.A. Khanin4,5, A.A. Zolotarev Jr.6
1Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences, ul. Akademika Vonsovskogo 14, Yekaterinburg, 620016, Russia
2St. Petersburg Mining University, Vasil’evskii ostrov, 2-ya Liniya 2, St. Petersburg, 199106, Russia
3A.P. Karpinsky Russian Geological Research Institute, Srednii pr. 74, St. Petersburg, 199106, Russia
4Institute of Experimental Mineralogy, Russian Academy of Sciences, ul. Akad. Osip’yana 4, Chernogolovka, 142432, Russia
5Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119991, Russia
6St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia
Keywords: Platinum-group minerals, chromite-platinum mineralization, clinopyroxenite-dunite massifs: Nizhnii Tagil, Svetlyi Bor, Veresovyi Bor, and Kamenushka, isoferroplatinum, irarsite, potarite, xingzhongite, PGE sulfides
Abstract
We present results of analysis of the morphology and chemical composition of platinum-group minerals from chromite-platinum orebodies of zoned clinopyroxenite-dunite massifs in the Middle Urals (Nizhnii Tagil, Svetlyi Bor, Veresovyi Bor, and Kamenushka). Study of more than 500 grains has given an insight into the sequence of formation of platinum-group minerals in chromitites of the studied massifs. Three assemblages of platinum-group minerals have been revealed: magmatic (Os-Ir-Ru intermetallic compounds, isoferroplatinum, ferroplatinum, sulfides of the isomorphous series laurite-erlichmanite and kashinite-bowieite, and thiospinels of the series cuproiridsite-cuprorhodsite-malanite); postmagmatic (with a predominance of tulameenite, tetraferroplatinum, and ferronickelplatinum, resulted from serpentinization of dunites); and latest secondary (minerals with a predominance of platinum-group sulfides, arsenides, sulfoantimonides, sulfoarsenides, plumbides, and amalgams).
DOI: 10.15372/RGG2019089
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