Paleoproterozoic East Pana Layered Intrusion (Kola Peninsula, Russia): Geological Structure, Petrography, Geochemistry and Cu-Ni-PGE Mineralization

The East Pana intrusion is a part of the Paleoproterozoic Fedorova–Pana complex (FPC), which belongs to group Fennoscandian layered mafic–ultramafic massifs. This article discusses magmatic stratification intrusion, as well Cu-Ni and platinum-group elements (PGE) mineralization (PGE zones A, B C) in its various parts with total length more than 20 km, including Chuarvy PGE deposit. Based on whole-rock data distribution major, trace, ore-forming elements, it assumed that zone A main ore–magmatic system FPC, while C belong minor systems. At same time, additional injection played an important role formation economic Cu-Ni-PGE B), characterized by high concentrations moderate palladium enrichment. On normalized spectra trace crystallization products this (Gabbronorite Zone 2) have positive Zr-Hf anomaly, distinguishes from host rocks anomaly opposite sign 1, Gabbro Zone). It portion magma was intruded sill crystal mush, fractionation at depth led enrichment residual liquid.