ORE-BEARING ULTRAMAFITE-MAFITE INTRUSIONS IN POLAR SIBERIA: AGE, FORMATION CONDITIONS, FORECAST CRITERIA. K.N. Malich, I.Yu. Badanina, E.V. Tuganova

The monograph is devoted to solving the fundamental problems aimed at (i) revealing the genetic nature and conditions for the formation of commercial ore-bearing intrusions of the Norilsk type and (ii) developing new approaches to forecasting deposits of strategic types of mineral raw materials. The work is based on the results of mineralogical-geochemical, geochronological and Hf-O-Nd-Sr-Os-Cu-S isotope-geochemical study of rocks, ores and minerals of ultramafic-mafic intrusions of Polar Siberia with different metallogenic potential. As a result of the studies performed, comprehensive data were obtained on the sources of silicate and ore matter, the duration and conditions for the formation of ultramafic-mafic intrusions and sulfide platinoid-copper-nickel mineralization in the Norilsk and Taimyr provinces. It is substantiated that the main factor for the formation of unique sulfide platinoid-copper-nickel deposits was a long period of concentration of ore components in intermediate magma chambers. Previously known prediction criteria are characterized and new isotope-geochemical indicators of the scale of sulfide platinoid-copper-nickel mineralization are proposed, which can be effectively used in assessing the ore content of poorly studied ultramafic-mafic intrusions of Polar Siberia.