Sulfide Mineralization in the Carbonatites and Phoscorites of the Guli Massif, Polar Siberia, and Their Noble-Metal Potential

摘要: We report the first combined investigation (neutron activation, X-ray fluorescence, and electron microprobe analysis) of mineral forms Au Ag noble metal distribution in sulfide-bearing phoscorites carbonatites Guli alkaline ultrabasic massif (Polar Siberia) magnetite sulfide separates from these rocks. The highest contents were observed carbonatites: up to 2.93 Pt, 61.6 Au, 3.61 ppm Ag. Pyrrhotite, djerfisherite, chalcopyrite, pyrite are most abundant sulfides main hosts for latest assemblage Ag-rich lenaite, sternbergite, native silver shows significant concentrations. wide occurrence K presence multiphase inclusions pyrrhotite consisting rasvumite, K‒Na–Ca carbonate, carbocernaite, strontianite, galena, suggest that formed at high activities K, Na, Sr, LREE, F, Cl, S. Chlorine complex-forming capacity could be an agent transport carbonatites. Crystallization early djerfisherite–pyrrhotite assemblages began a temperature not lower than 500°C continued formation late Ag-bearing temperatures higher 150°C. carbonatite-series rocks enriched during low-temperature stages serve as source placers.