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Minerals 2018, 8(4), 124; doi:10.3390/min8040124

World-Class PGE-Cu-Ni Talnakh Deposit: New Data on the Structure and Unique Mineralization of the South-Western Branch

1
Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin St., 19, 119991 Moscow, Russia
2
V.S.Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Koptyuga Ave., 3, 630090 Novosibirsk, Russia
3
Russian Federal Geological Foundation, 3d Magistralnaya St., 38, 125993 Moscow, Russia
4
MMCo Norilsk Nickel, Polar Division, Lenina Ave., 1, 663300 Norilsk, Russia
5
Institute Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Staromonetny Per., 35, 119017 Moscow, Russia
6
Lomonosov Moscow State University, Leninsky Gory, 1, 119992 Moscow, Russia
*
Author to whom correspondence should be addressed.
Received: 30 December 2017 / Revised: 15 March 2018 / Accepted: 15 March 2018 / Published: 21 March 2018
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Abstract

The Talnakh deposit is one of the largest PGE-Cu-Ni deposits in the world. It is located inside the North-Western part of the Siberian Trap province and consists of three branches. The problem of massive ore origins has been discussed for several decades. The structure of the South-Western branch and the mineralogy of related its Cu-rich ore are discussed in this article. The Southern-2 orebody has a deep inclination (45°) inside the intrusive body, close to its wall, in contrary to the horizontal orebodies of the North-Eastern branch. Mineral composition of the Southern-2 orebody differs from the composition the other orebodies of the Talnakh intrusion as well. It consists ofchalcopyrite, pentlandite with subordinate cubanite, and pyrrhotite. Its specific feature is a large amount of bornite and chalcocite. These minerals occur in disseminated and massive ores. The ores of the other branches of the Talnakh intrusion have chalcopyrite-pyrrhotite compositions whilethe Southern-2 massive ore is enriched in Cu (19.03–25.8 wt %; Cu/Ni = 3.8–8.6) and PGE: ΣPGE changes from 39.1 to 279 ppm, Pd/Pt = 1.3–32. Twelve minerals of the systems Pd-Sn-Cu, Pd-Pb-Bi, Pd-Ni-As, Au-Ag-Pd-Cu, and intermetallics of the Pt-Fe-Cu-Ni types were discovered in ores, but are also widespread in other orebodies. Isoferroplatinum, sperrilite and cooperitewere not found. The unusual structure and composition of the Southern-2 orebody suggest its origin from a separate magma impulse. The correlation between disseminated and massive ores of the Southern 2 orebody in term of chemical and mineralogical composition is evidence of the formation of massive oresin situ, without displacement along the bottom of the massif. View Full-Text
Keywords: Norilsk area; PGE-Cu-Ni ores; gabbro-dolerites; Talnakh; massive ore origin Norilsk area; PGE-Cu-Ni ores; gabbro-dolerites; Talnakh; massive ore origin
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Krivolutskaya, N.; Tolstykh, N.; Kedrovskaya, T.; Naumov, K.; Kubrakova, I.; Tyutyunnik, O.; Gongalsky, B.; Kovalchuk, E.; Magazina, L.; Bychkova, Y.; Yakushev, A. World-Class PGE-Cu-Ni Talnakh Deposit: New Data on the Structure and Unique Mineralization of the South-Western Branch. Minerals 2018, 8, 124.

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