Ioko-Dovyren layered massif: Ni-Cu-PGE deposit related to magmatism during rifting

摘要

The world's main sources of Ni and platinum group elements (PGE) are the Archean komatiite bodies of Kambalda, the Lower Proterozoic norite massif at Sudbury, picrodolerite bodies of Pechenga, and the Permo-Triassic picrodolerite massifs of the Norilsk-Talnakh area, in addition to various laterites. Archean and Lower Proterozoic dunite-garzburgite-bronzitite-gabbronorite massifs at Bushveld, Stillwater, and the Great Dike are the principal sources of low-sulphide PGE ores.Sulphide PGE-Ni-Cu and low sulphide PGE mineralization has been discovered in Rifean (Upper Proterozoic) Ioko-Dovyren mafic-ultramafic intrusion at North Baikal region, Russia. Mineralization is associated with conduits within a volcano-plutonic complex that formed within a continental paleorift structure. This discovery places the Rifean metallogenical epoch alongside the Archean and Lower Proterozoic epochs as major periods of Ni-Cu-PGE metallogenesis.