Structural and Composmonal Evolution of Precambrian Sulfide-Nickel Ore-Magmatic Systems

Nine types of sulfide-nickel ore-magmatic systems (OMS) have been distinguished, which are spatially and genetically related to volcanic, volcano-intrusive and intrusive ultramatic-matic formations. The last ones form part of structure-composition complexes of Early Archean nucleocratons, Late Archean greenstone belts, epi-Archean cratonic structures and zones of tectonomagmatic activation of platforms in Proterozoic. The evolution trend of the OMS developments is followed. The petrological and geochemical pattern, composition, and scales of OMS depend on subsequent changes in geodynamic and endogenic regimes of their formation, at the depth of magmatic melt production, with the mantle-crust interaction processes playing an increasing role.