COBALT MINERALIZATION IN THE ALTAI-SAYAN OROGEN: AGE AND CORRELATION WITH MAGMATISM
I.G. Tretiakovaa, A.S. Borisenkoa, V.I. Lebedevb, G.G. Pavlovaa, V.A. Goverdovskiic, and A.V. Travina
a V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, prosp. Akad. Koptyuga 3, Novosibirsk, 630090, Russia
b Tuva Institute for Exploration of Natural Resources, Siberian Branch of the Russian Academy of Sciences, ul. Internatsional'naya 117a, Kyzyl, 667007, Russia
c Metally Altaya Mining Company, prosp. Kommunisticheskii 99, Gorno-Altaisk, 649002, Russia
Keywords: Cobalt deposits, mineralization age, mafic magmatism, granitoids, Altai-Sayan orogen
Pages: 1078-1090
Abstract
The paper discusses the spatiotemporal and genetic relationships of hydrothermal Co mineralization in the Altai-Sayan orogen with mafic, alkaline mafic, and granitoid magmatism on the basis of isotopic, geochemical, and geochronological investigations. Four stages of Co mineralization have been distinguished for this region: Early Devonian (D1), Late Devonian-Early Carboniferous (D3-C1), Permo-Triassic (P2-T), and Early Cretaceous (K1). They correspond to periods of large-scale mafic magmatism. Isotopic (Pb, Sr, He) and geochemical studies have shown that Co mineralization is genetically related to mafic and granitoid magmatism. Also, these studies have confirmed that Co deposits formed with the participation of mantle fluids and are related to chambers of mafic and alkaline mafic melts. Besides, it has been found that ore originated both from magmatic sources and host rocks. A pulsed facies endogenic zonation has been established for Co deposits, Co-bearing ore clusters, and zones with high-temperature Co-As and low-temperature Ni-Co-As mineralization. It has been first established that ores at hydrothermal Co deposits are rich in Pt and Pd.
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