Abstract
The Early Proterozoic Imandrovsky (Kola Peninsula) and Lukkulaisvaara (northern Karelia) layered intrusions host various platinum-group element (PGE) deposits. The PGE-bearing chromitite horizon is located in the Lower Zone of the Imandrovsky complex. Platinum-group minerals (PGM) are associated with rare base-metal sulfides and sulfarsenides, and predominantly present as minute (up to 25 ,um) grains enclosed by hydrosilicates and at chromite-silicate grain boundaries. The presence of Cl-bearing minerals in the vicinity of the chromitite layer is of genetic significance. Chlorapatite containing up to 100% of the chlorapatite end-member occurs in individual grains, small veinlets (25–30,μm across) and rims around relatively Cl-poor apatite. Cl-bearing (0.5 wt.% Cl) allanite-(Ce) forms very small (up to 20μm across) veinlets in Cl-poor apatite.
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