Ore minerals in metasomatites of the Harbey metamorphic complex (Polar Urals)
Ore minerals were studied in metasomatically altered amphibolites of the Harbey metamorphic complex along Skalisty stream: dislocated clinozoisite-chlorite-muscovite-albite-amphibole schists, mainly clinozoisite and quartzy rocks. Ore minerals are represented by sulfides and rare deposits of tellurides, selenides and native metals. Several stages of the sequential formation of these formations associated with hypogenic hydrothermal and hypergenic processes were identified. At an early stage of hydrothermal-metasomatic changes of rocks, high- and medium- temperature ore minerals were formed in them-pyrite, pentlandite, Ni-pyrrhotite and possibly chalcopyrite and molybdenum, associated with chlorite - ripidolite The next stage is associated with hydrothermal processes, as a result of which high- and medium-temperature formations of the gold-sulfide-quartz formation were crystallized in the altered amphibolites: pyrite, chalcopyrite, molybdenite, matyltide-galena, galena, sphalerite, bornite, pyrrhotite, relatively low-grade gold and Hg-electrum. The rocks contain medium- and low-temperature hypogenic minerals of the third stage, associated with pycnochlorite-brungsvigit and ripidolit-daphnite: Ni- and Co pyrite, claustalite-galena, melonite, merenskiite, merenskiite-melonite, hessite and acantite. At the final stages, under the influence of low-temperature hypergenic processes, native silver, covellite, acanthite, hessite, etc. formed in metasomatites.