The formation of copper-nickel sulfide deposits of the Norilsk and Sudbury types is related to the ore-bearing layered mafic-ultramafic intrusions that are confined to local platform depressions 1-4. According to the scenario proposed in 5, the initial stages of the deposit formation include the separation of mafic magma into immiscible silicate and sulfide melts, the secondary layering of the sulfide liquid into the fractions enriched in Ni and Cu, and their subsequent gravitational differentiation.
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