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TO THE QUESTION OF THE CORRELATION OF EARLY PALAEOZOIC SUB-ALKALINE AND ALKALINE INTRUSIVE FORMATIONS OF THE WESTERN AND EASTERN SLOPES OF KUZNETSKIY ALATAU

N. A. Makarenko, A. D. Kotelnikov

National Research Tomsk State University, Tomsk, Russia

A brief retrospective analysis of the evolution of the views of geologists on the principles of the separation of subalkaline and alkaline formations of the Mariinskaya taiga is carried out. The necessity of restoring the status of the previously eliminated Kiya gabbro-syenite-nepheline syenite complex without changes in its previous volume and borders, but adjusted for age (middle Cambrian, not early Devonian), is substantiated. In the regional plan, a comparison was made of the author’s U-Pb dating of monzodiorites and gabbroids of the Kogtakhskiy and Kashparskiy intrusive complexes on the eastern slope of the Kuznetskiy Alatau with the long-known U-Pb dates for monzodiorites of Malodudetskiy and syenites of the Kiya complexes of the Mariinskaya taiga. Distinct kinships of a geochronological, petrographic, and petrogeochemical nature were found between the Malodudetskiy and Kashparskiy, as well as the Kiya and Kogtakhskiy complexes, formed over two narrow geochronological intervals – Late Cambrian – Early Ordovician ≈485–490 Ma in the first case and Middle Cambrian ≈495–500 Ma in the second. This allows a high degree of probability to correlate these formations located on opposite slopes of the Kuznetskiy Alatau.

Keywords: Kuznetskiy Alatau, Mariinskaya taiga, correlation, intrusive complexes, Kiya gabbro-syenitenepheline syenite complex, U-Pb dating.

DOI 10.20403/2078-0575-2020-2-87-95