The features of composition and distribution of the “PGM ZONE C” noble metal mineralization of the East Pana layered intrusion (Kola peninsula)
This work investigates the composition and distribution of platinum mineralization in ore zone "C" of the Sungiyok and Chuarvyareas within the East Pana massif. The relevance of this work results from insufficient knowledge of this ore zone in this part ofthe massif, with its ore mineralization being virtually unexamined. Research methods: review of scientific publications and librarymaterials on platinum-metal deposits in stratified intrusions worldwide and on the Kola Peninsula; macroscopic and microscopicstudies of rock samples, thin sections, transparent polished thin and microsections in transmitted and reflected light; microprobeanalysis of transparent-polished thin sections (21 pcs) in the Geomodel Resource Center using a Hitachi S-3400N scanning electronmicroscope (operated by Shilovskikh V. V.), statistical processing of data using the Statistica software suite v. 6.1. For the first time,a study of the noble-metal mineralization of the "C" ore zone allowed to classify it into two types: early magmatic (low-sulfide) andlate post-magmatic (no-sulfide) associations. The earlier one is represented with platinum and palladium sulfides, i.e. braggite,cooperite; native noble metals, i.e. gold, silver; ferroplatinum, moncheite, kotulskite. The noble metal minerals form inclusionsin the main magmatic sulfides and rock-forming silicates or are located in their contact zones; they are characterized by a closespatial and correlational relationship with the main sulfides. The late association includes arsenides, stibioarsenides, platinumand palladium antimonides, i.e. sperrylite, mertieite, stibiopalladinite, as well as temagamite, kotulskite, and telargpalite. They arelocalized in metasomatic alteration zones forming veinlets and developing along fractures in magmatic rock-forming silicates,and occur in association with rare late hydrothermal sulfides. For the second type, i.e. postmagmatic association, no significantcorrelation with sulfides is observed. Both types of mineralization are characterized by anomalously low Pd/Pt values of 0.1-1.7.