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DEVONIAN VOLCANISM OF THE MINUSA TROUGH IN TERMS OF TWO GEOLOGICAL HYPOTHESES – CONTINENTAL SILLOGENESIS AND ALKALINEBASITE PETROGENESIS (BY MATERIALS OF SCIENTIFIC PUBLICATIONS)

N. A. Makarenko, A. D. Kotelnikov

National Research Tomsk State University, Tomsk, Russia

Applied aspects of the hypothesis of continental sillogenesis has been critically analyzed based on the idea of the total dominance of intrusive formation bodies of basites (sills) over the effusive covers in the sedimentary-volcanogenic Lower Devonian Byskarian series of the Minusa Basin. The ambiguity of the recommended criteria for the practical application of the correct diagnosis of the basitic sills is shown. A negative attitude towards attempts to transfer a number of essentially effusive Lower Devonian formations to the category of intrusive formations with a parallel withdrawal of basites from stratigraphic databases is taken. Based on the actual materials received by the NIL team of the Tomsk State University in compiling the second-generation medium-scale State geological map (N-46-XIX nomenclature sheet), doubts are expressed about the actual presence of nepheline- and leucite-containing alkaline rocks in the south of the Minusa Basin. To solve this problem, additional specialized studies are needed.

Keywords: Minusa Trough, sillogenesis, basite diagnosis features, effusive rocks, sills, alkaline rocks.

DOI 10.20403/2078-0575-2018-4-105-111