On the role of dyke and vein bodies in the distribution of Cu-Ni-PGE mineralization in the Monchegorsk layered complex (Kola peninsula, Russia)

Abstract

A brief review of the role of dyke and vein bodies from the differentiated intrusions for the concentration of Cu-Ni-PGE mineralization is given. Our research within the Monchegorsk layered ultra-mafic-mafic complex of the Kola Peninsula has established that the mineralization of the Southsopchinsky layered massif is not connected with it “layered unit” (pyroxenite, norite, gabbronorites). The vein bodies of magnetite-amphibole-plagioclase composition are located in pyroxenite of “margin unit”. It is also assumed that the prospective PGE mineralization in the contact zone of Monchepluton and Monchetundra intrusion does not refer to the “reef-type”. We believe that mineralization belongs to the “contact-type” redeposited during the late-magmatic processes. According to findings of geologists of JSC "Central Kola Expedition" a new type of vein Cu-PGE mineralization in the West Nittis target, the conclusion about the importance of this type of mineralization (along with a “reef-type”) in the overall balance of the Monchegorsk complex is given.