JURASSIC AND CRETACEOUS STRATIGRAPHY OF THE NEW SIBERIAN ARCHIPELAGO (Laptev and East Siberian Seas): FACIES ZONING AND LITHOSTRATIGRAPHY
B.L. Nikitenko1,2, V.P. Devyatov3, N.K. Lebedeva1,2, V.A. Basov4, A.A. Goryacheva1,2, E.B. Pestchevitskaya1, L.A. Glinskikh1
1A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
3Siberian Research Institute of Geology, Geophysics, and Mineral Resources, Krasnyi pr. 67, Novosibirsk, 630091, Russia
4I.S. Gramberg Russian Research Institute of Marine Geology and Mineral Resources, Angliiskii pr. 1, St. Petersburg, 190121, Russia
Keywords: Jurassic, Cretaceous, facies division, stratigraphy, foraminifera, ostracods, dinoflagellate cysts, spores and pollen, Arctic, New Siberian Islands
Abstract
Mesozoic sections in the New Siberian Archipelago are important for understanding of the geology of underexplored shelf areas in the east of the Laptev Sea and in the west of the East Siberian Sea. They are reference sections for interpretation of seismic data in these regions. However, there are still many unresolved problems concerning the lithology, lateral extent, and age of Mesozoic deposits, as the sections have a complex structure and are heavily deformed. The performed research makes a basis for the first facies zoning of Jurassic and Cretaceous deposits in the New Siberian Islands and adjacent landmasses of continental Siberia at the junction of the Laptev and East Siberian Seas. The lithostratigraphic division of the Jurassic and Cretaceous is refined, being proposed for the first time for some stratigraphic intervals, and allows updating their lithostratigraphic division (or undertaking it for the first time for some stratigraphic intervals). Facies features of Jurassic and Cretaceous deposits allow the definition of three depositional series.
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