Abstract
This research work is devoted to the study of the chemical composition of the alkalinesyenite massifs of the Sydo-Erba depression based on the available geological and geochemical data. For about 100 years, the massifs have attracted the attention of various scientists not only from the practical point of view, as possible sources of aluminum raw materials, but also as objects for research, in particular, to determine the shape of the bodies of nepheline syenites occurring in them and models of the formation of alkaline magmas. The studied intrusions are composed mainly of syenites and alkaline syenites, as well as a few bodies of nepheline syenites. The paper will present and compare the geochemical data of alkaline nepheline syenites (foyaites) and nepheline syenites (tensbergites), which compose such massifs as Saibarsky, Burovsky, Vysokoy, Kosmatoy, in order to identify the influence of granite-diorite complexes on their composition. To achieve this goal, it is supposed to study the geological and petrographic features of the structure of the massifs, as well as to analyze the chemical composition of rocks of geochemical data presented in the form of contents of petrogenic and rare elements.
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