Typochemistry of sulfides of the Ozernoe Au-Pd occurrence (Polar Urals)

The paper presents the first results of local studies of the content and distribution of trace elements in minerals of low-sulfide ores of various associations of the Ozernoe (copper-)gold-palladium occurrence, discovered in 2002 in the Polar Urals and localized in clinopyroxenites and wehrlites of the Middle Paleozoic. According to LA-ICP-MS data, the diversity and concentration levels of trace elements in three associations (pyrrhotite-pyrite, pyrrhotite-chalcopyrite-cubanite and bornite-chalcopyrite) are different. Thus, pyrite of the first association, common on the flanks of the ore zone, is characterized by high concentrations of Co, Se, moderate ones of Ni and traces of Bi, Sb, Ag. The minerals of the pyrrhotite-chalcopyrite-cubanite association, common within the ore zones, commonly contain Ag, Pb and Se, as well as groups of elements (Sb, Bi, Au, Te and Pd), occurring in noticeable amounts, but sporadically, which may be conditioned by microinclusions of their minerals. The highest concentrations of Ag, Se, Te, and Pd are recorded in copper sulfides of the bornite-chalcopyrite association, especially in bornite. The main components of ore and non-metallic minerals (sulfides, Fe-oxides, olivine and pyroxene) has been studied by electron probe microanalysis.