Abstract
This review-analytical article presents the most important geological, geochronological and geochemical characteristics of the basaltoids of the Ostrogorsk complex. Some Early Miocene datings of the age of Ostrogorsk basaltoids on the State Geological Map of the third generation (sheet M-53) were not considered due to methodological considerations and, for greater objectivity, they are given by the author in this article. The basaltoids of the Ostrogorsk complex, like the alkaline basalts of the Ayakit complex, belong to intraplate rift basalts. The spectra of rare earth and rare elements in both complexes are very similar. The composition of basaltoids of the Ostrogorsk and Ayakit complexes is close to the composition of oceanic island basalts and recycled components, which suggests that they have a single mantle-crustal source.
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