World-Class PGE-Cu-Ni Talnakh Deposit: New Data on the Structure and Unique Mineralization of the South-Western Branch
AbstractThe 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
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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.
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(4):124.Chicago/Turabian Style
Krivolutskaya, Nadezhda; Tolstykh, Nadezhda; Kedrovskaya, Tatyana; Naumov, Konstantin; Kubrakova, Irina; Tyutyunnik, Oksana; Gongalsky, Bronislav; Kovalchuk, Elena; Magazina, Larisa; Bychkova, Yana; Yakushev, Anton. 2018. "World-Class PGE-Cu-Ni Talnakh Deposit: New Data on the Structure and Unique Mineralization of the South-Western Branch." Minerals 8, no. 4: 124.
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