NEW DATA ON PETROGEOCHEMICAL RESEARCH OF PRE-ALPINE QUARTZ DIORITES AND GRANITOIDS OF THE LOKI CRYSTALLINE MASSIF (LESSER CAUCASUS)

The issues of geochemistry and genesis of the Upper Devonian quartz diorites and Late Variscan granitoids of the pre-Alpine basement of the Loki crystalline massif are discussed. According to I, S and A types of the geochemical classification of granits, quartz diorites belong to S and partly M type granites, and granitoids belong to S and I types. The chemical composition of granitoids corresponds to normal, mostly normal alkaline-acid rocks. The granitoids and quartz diorites of the massif are characterized by the signs of magmatic rocks of volcanogenic-arc origin, which indicates mainly the subduction conditions of their formation.