GEOLOGICAL SETTING AND PLATINUM POTENTIAL OF GABBRO-10 MASSIF, MONCHEGORSK COMPLEX, KOLA REGION

DOI: 10.24411/0869-5997-2018-10008

Abstract

Geological and geochemical studies suggest that Gabbro-10 massif is the late intrusive phase of Nyud-Poaz layered massif and forms a part of Paleoproterozoic ore-magmatic system of Monchegorsk complex. PGE-Cu-Ni massif mineralization containing up to 2,3 g/t Pd is assumed to be contact type. Mineralization resulted from sulfide and silicate melt interaction in an intermediate chamber at depth (R factor range of 2000–20000) and is potentially economic. Economic prospects are related to orebodies of a Cu-Ni occurrence explored in the 1930s and metagabbro strata in Verkhny Nyud block virtually unexplored for PGE. Gabbro-10 massif is most similar to Fedorova Tundra deposit where ore formation resulted from the late emplacement of sulfide fluid-rich
melt in the layered intrusion basal part. The massif
geological identification significantly contributes to
understanding layered intrusion petrology and formation processes of contact-type PGM deposits.