Scientific publications

The geological, petrological and mineralogical characteristics of intrusive porphyraceous charnockitoids from Lake Notozero, North Karelia, and garnet-amphibole-biotite gneisses after them are discussed and summed up for the first time. Typical mineral replacement processes, responsible for the transition of Notozero porphyraceous charnockitoids to their diaphthorated varieties under amphibolite and epidoteamphibolite-facies conditions of Belomorian-type metamorphism, were studied. New data on the compositions of minerals of granulitic and diaphthoric parageneses of charnoenderbites and charnockites are presented. The PTparameters of formation of charnockitoids (750–870 С at pressures of 6.0–8.0 kbar) at the granulitic stage and alterations at the diaphthoric (704 С – 590 С, Р = 10.0–9.0 kbar and up to 579–496 С at Р = 9.0–8.0 kbar) stage of the metamorphic evolution of the Lake Notozero-Lake Kovdozero GEC complex were estimated.