The results of mineralogical, geochemical, X-ray, isotopic and spectroscopic studies of coarse-crystalline pyrite (Kyvvozh Formation, Dimtem’el Creek, Central Timan) are presented. Pyrite is characterized by cubic habit and zonal Co distribution. It contains galena, thorite, zircon, monazite, rutile, chlorite, muscovite, quartz, albite, apatite and calcite inclusions. The unit cell parameter of pyrite vary from 5.4137 ± 0.0002 to 5.4187 ± 0.0010 Å and correspond to an ideal pyrite. The sulfur isotopic composition of coarse-crystalline pyrite of 15.8‰ indicates its formation as a result of sulfate reduction during epigenesis.

Keywords: coarse-crystalline Co-bearing pyrite, sulfur isotopy, Mössbauer spectroscopy, X-ray difrac-tion, Riphean, Dimtem ′el Creek, Central Timan.

Received 13.03.2021, accepted 20.03.2021

R.I. Shaybekov, Institute of Geology Komi SC UB RAS, ul. Pervomayskaya 54, Syktyvkar, 167000 Russia; shaybekov@geo.komisc.ru;

M.Yu. Sokerin, Institute of Geology Komi SC UB RAS, ul. Pervomayskaya 54, Syktyvkar, 167000 Russia;

V.G. Kotelnikov, Syktyvkar sector of FGBU «VSEGEI», Oktyabrskiy pr. 127, Syktyvkar, 167000 Russia;

A.Yu. Lysyuk, Institute of Geology Komi SC UB RAS, ul. Pervomayskaya 54, Syktyvkar, 167000 Russia;

G.V. Ignatyev, Institute of Geology Komi SC UB RAS, ul. Pervomayskaya 54, Syktyvkar, 167000 Russia;

E.M. Tropnikov, Institute of Geology Komi SC UB RAS, ul. Pervomayskaya 54, Syktyvkar, 167000 Russia

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