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Vol. 15 (2012 year), No. 2

Mitrofanov F.P., Malitch K.N., Bayanova T.B., Korchagin A.U., Zhirov D.V.
Comparison of East-Scandinavian and Norilsk large plume mafic igneous provinces of PGE ores

The paper is devoted to issues related to the formation of large low-sulfide PGE ore provinces – East-Scandinavian and Norilsk. Basing multidisciplinary data it has been inferred that East-Scandinavian province is being attributed to an intracratonic type without subduction and crust contamination (with Pt-Pd low-sulfide mineralization to predominate). Norilsk province belongs to pericratonic one with PGE – Ci-Ni rich sulfide mineralization to prevail. It has been shown that the main ore provinces PGE metals essentially formed at later stage of existence and initial break-up of supercontinents – predominantly 2.7-2.5 Ga and 1.8-1.7 Ga as a unique case in the Late Paleozoic (Norilsk). For the first time long duration (dozens of Ma) and multistage nature of ore-magmatic system evolution for the East-Scandinavian mafic Large Igneous Province have been demonstrated and this has made it possible to propose it for Norilsk. Comparison of low-sulfide PGE and sulfide Cu-Ni (with PGE) potential of the mafic intrusions is possible using a series of geological, geophysical and geochronological (U-Pb on zircon and baddeleyite, Sm-Nd on rock-forming and sulfides minerals) and isotope geochemical (?Nd(T), TDm, ISr, 3He/4He) indicators.

(in English, стр.15, fig. 8, tables. 1, ref 41, Adobe PDF, Adobe PDF 0 Kb)