PGE-COPPER-NICKEL MINERALIZATION OF THE LAYERED MASSIF OF THE GENERALSKAYA MOUNTAIN (PEEHENGA ORE DISTRICT, KOLA-PENINSULA)

New data on the petrology, phase, and cryptic layering of the General' skaya (Luostari) mountain massif as well as on the geochemistry and mi neralogy of its platinum-copper-nickel mineralization are presented. T he intrusive rocks are divided into marginal and layered groups. The l ayered group includes the upper and lower gabbronorite zones and the m iddle rhythmically layered zone, where massive gabbronorites intercala te with rocks of contrasting composition. Low-sulfide platinum mineral ization is localized within several extended horizons of thin-layered, taxitic, and poikilitic rocks of the rhythmically layered zone. The g rade of platinum metals in ore horizons is up to 5 g/t with palladium predominating over other platinum group elements (PGE). The PGE occur in the massif in mineral and dispersed forms. The predominant platinum -bearing association in the ore horizons of the General'skaya mountain massif consists of merenskyite and sulfarsenides of Ni and Co with an admixture of PGE and hollingworthite. A wide range of miscibility bet ween hollingworthite and Pd- and Rh-bearing cobaltite and gersdorffite is defined. The Pechenga ore district is characterized by the develop ment of a peculiar mineralogical ''sulfarsenide'' province with a frac tionation of PGE in the individual sulfarsenide parageneses of each in trusion.