On the classification of industrial pegmatites of Northern Karelia and the direction of exploration work on mica

Abstract

Many researchers have attempted to classify the pegmatite formations of Northern Karelia, but all proposed schemes suffer from a one-sided approach to taking into account the existing geological factors and use only one or two guiding ones, ignoring the rest. Thus, some divide all the pegmatites of the region into mica-bearing and ceramic [1], others classify them by mineral composition [3], others only by shape, and others by shape and the nature of the distribution of mica in the veins. None of the proposed classifications take into account the geological and structural factors characterizing the conditions of formation of industrial pegmatites. For these reasons, the listed classifications of industrial pegmatites of Northern Karelia are almost never used in prospecting and exploration work, as well as in assessing these deposits. The most perfect classification of pegmatites of Northern Karelia should be considered the classification proposed by V.D. Nikitin and P.P. Borovikov, in the compilation of which the author's materials were used. Studies of pegmatites in Northern Karelia conducted in recent years have provided a significant amount of material for determining the conditions of formation of pegmatites and classifying them according to genetic characteristics.