Ore mineralization of the Nyarovei series (Polar Urals)

Ore mineralization in the Upper Proterozoic deposits of the Nyarovei series of the Tectonic Zone of the Polar Urals is poorly studied. The establishment of genesis of ore minerals is of great interest for determining the regularities of ore formation and identifying industrially significant objects in the north of the Urals. Among the rocks of the Nyarovei series there are carbonaceous schists characterized by increased concentrations of metals, rare and rare-earth elements. We have obtained new data on ore minerals from the metabasalts and metapelites of the Nyarovei series. The purpose of this work is to clarify the metallogenic specialization in the metabasalts and metapelites of the Nyarovei series and to establish a more complete picture of the genesis of ore minerals in the Upper Proterozoic deposits of the Polar Urals.The peculiarities of sulfide and sulfate ore mineralization of the Upper Proterozoic deposits of the Nyarovei series of the Polar Urals are studied. The metabasalts of the Nyarovei series are characterized by the presence of pyrite, chalcopyrite, galena, barite, and anglesite, while metasedimentary formations contain pyrite, chalcopyrite, and sphalerite. The formation of pyrite in metabasalts and metapelites is different and has its own characteristics for each type of rocks. In metabasalts, pyrite was formed as a result of rock metamorphism during mobilization of finedispersed sulphides. Metabasalts of the Nyarovei series are promising for gold, its occurrence in the mineral structure was carried out jointly with As. Pyrite from metapelites was formed during sedimentation. At metamorphism of rocks, it was purified of impurities, then under nearsurface conditions it was replaced by iron hydroxides.The rocks of the Nyarovei series can be promising for gold and uranium. Genesis of gold and uranium mineralization may be related to metamorphic and postmetamorphic processes.