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The diversity of the material composition of the middle Paleozoic basites is determined by the geodynamic regime. Paleorift dike belt record several groups of basites, differing in their material composition. The most common basites were formed in the regime of extension - magma has not experienced significant changes after leaving magma formation zone. These are typical basites of the Middle Paleozoic paleorifts of the eastern part of the Siberian platform. Group of leucocratic gabbro-dolerites and plagiodolerite...