New findings of rare Ni, Zn, Cr, Cu and V sulphides in carbonatites of South Urals

For the first time, information is provided on the discovery of rare dolomite-calcite carbonatite in the dyke in the Svetlinsky gold ore deposit in the South Urals, rare sulfides of Ni, Zn, Cu, Cr and V: vaesite, kalininite, sulvanite and patronite. With each other and with the surrounding crystals of dolomite and calcite, they have surfaces of simultaneous growth. Extremely small sizes crystals (less than 30 microns) make it impossible to study the physical properties of minerals, to give their X-ray characteristics. Data on the chemical composition of sulfides was obtained by SEM REMMA-202 M. Sulfides (including pyrite) were found in the form of very fine dispersed impregnation in the dark bands of carbonatites enriched with fluorophlogopite crystals, native sulfur and hydrogen sulfide localized in microporous areas of calcite crystals. The confinement of such sulfides in all their occurrences mainly to carbonate rocks is emphasized. The ubiquitous enrichment of mineral impurities in such carbonatites with fluorine, chromium, vanadium and nickel may indicate the participation of ultrabasic-alkaline magma fluids in their formation. This was favoured by the presence of carbon dioxide and hydrogen sulfide in them.