STRATIGRAPHY AND SEDIMENTOGENESIS OF THE CLINOFORM UPPER JURASSIC OF THE ANABAR-LENA SEDIMENTARY BASIN (Arctic Siberia, Laptev Sea Coast)
V.P. Devyatov1, B.L. Nikitenko2,3
1Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia
2Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
3Novosibirsk State University, Novosibirsk, Russia
Keywords: Upper Bathonian, Lower Cretaceous, bio-, litho-, seismostratigraphy, clinoform structure, correlation, thickness analysis, Anabar-Lena sedimentary basin
Abstract
New materials on the stratigraphy and structural features of the Bathonian-Neocomian sections of the Anabar-Lena basin are presented. In the territory adjacent to the Taimyr mountain-folded system, a clinoform-like structure of the Upper Jurassic strata has been revealed, which are characterized by high thickness compared to adjacent sections in the east of this region. The lectostratotype of the Chernokhrebetnaya Formation (uppermost Lower Oxfordian-lowermost Volgian) is proposed. The most complete and continuous stratigraphic section is compiled, its litho- and chronostratigraphic correlations are given comparing to the sections of adjacent territories characterized in detail by fossil assamblages. The evidences for a new lithostratigraphic division of the territory are provided, facies zoning of sediments is clarified, a thickness chart of the Upper Bathonian-Boreal Berriasian strata of the Khatanga-Olenek interfluve is proposed.
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