SEDIMENTOLOGY AND LITHOCHEMISTRY OF THE LOWER - MIDDLE CAMBRIAN SEDIMENTS FROM THE YUDOMA RIVER SECTIONS (SIBERIAN PLATFORM)
S.V. Saraev, T.M. Parfenova, A.S. Ganashilin, I.V. Korovnikov
Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Siberian Platform, Lower, Middle Cambrian, kerogen-containing rocks, sedimentology, lithochemistry, sedimentation conditions
Abstract
Based on new sedimentological, lithochemical, and biostratigraphic data, the main part of the Inikan Formation, which is part of the Kuonamsky Complex of the Lower and Middle Cambrian on the Siberian Platform, has been characterized. Using an integrated approach, including textural analysis, study of the geochemistry of rock-forming oxides and organic carbon, lithochemical calculations, optical petrographic, and X-ray structural studies, a classification of carbonaceous rocks in the Inikan and Chay Formations has been proposed. This has allowed us to clarify the structure of the overall section and the conditions under which Cambrian deposits formed. For the first time, widespread influence of volcanic activity during sedimentation in the Kuonamsky Complex in the southeastern Siberian Platform has been identified. The distribution of paleoseismic breccia in the section has also been described, with horizons that represent good regional stratigraphic markers. Limitations in the use of the Strakhov module and the Nesbit-Young CIA index for characterizing sedimentation conditions of domanicoids have been revealed.
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