Affiliation:
1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Abstract
The age of potassium-bearing minerals from high-K nepheline syenites, libeneritized and carbonatized nepheline syenites, as well as pseudoleucite syenites of the Bogdo alkaline massif (Arctic Siberia) was determined by the 40Ar/39Ar method. As a result of generalization and analysis of the 40Ar/39Ar dating data, on the summary thermochronological diagram for minerals from the rocks of the Tomtor massif, the Udachnaya-Vostochnaya kimberlite pipe, and alkaline rocks of the Bogdo massif, the polychronicity of the formation of alkaline complexes of the Tomtor type at the Paleozoic stage was revealed. Based on isotopic data, a complex, three-stage history of the formation of the rocks of the Bogdo massif is reconstructed, with the manifestation of the Late Devonian-Early Carboniferous stage – the most productive for rare-metal-rare-earth mineralization. The Devonian period of the formation of the Tomtor and Bogdo massifs is associated with the impact of the Vilyui plume on the eastern edge of the Siberian craton. A close age interval is fixed during the formation of the rocks of the Kola alkaline province.
Publisher
The Russian Academy of Sciences
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