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Russian Geology and Geophysics

2018 year, number 2

JURASSIC AND CRETACEOUS BIOSTRATIGRAPHY AND ORGANIC MATTER GEOCHEMISTRY OF THE NEW SIBERIAN ISLANDS (Russian Arctic)

B.L. Nikitenko1,2, V.P. Devyatov3, N.K. Lebedeva1,2, V.A. Basov4, E.A. Fursenko1,2, A.A. Goryacheva1,2, E.B. Peshchevitskaya1, L.A. Glinskikh1, S.N. Khafaeva1
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 All-Russian Research Institute of Geology and Mineral Resources of the World Ocean, Angliiskii pr. 1, St. Petersburg, 190121, Russia
Keywords: Юра, мел, стратиграфия, органическая геохимия, молекулы-биомаркеры, фораминиферы, остракоды, цисты динофлагеллят, споры и пыльца, Арктика, Новосибирские острова, Jurassic, Cretaceous, Arctic, New Siberian Islands, stratigraphy, organic geochemistry, biomarker molecules, foraminifers, ostracods, dinocysts, spores and pollen

Abstract

The Jurassic-Cretaceous terrigenous complex of the Laptev and East Siberian seas is of considerable interest as a potential exploration target. However, the key Jurassic and Cretaceous sections of the New Siberian Islands have been poorly studied. The results of this study were used to provide a detailed micropaleontological description of these sections and substantiation of the previous lithostratigraphic subdivision. We first identified a series of Boreal standard zones in the Jurassic and Cretaceous sections, based on their foraminifers, ostracods, dinocysts, and terrestrial palynomorphs. Our results, along with the published data on ammonites, bivalves, and terrestrial palynomorphs and the results of radiometric dating, provide more precise constraints on the stratigraphic position of the identified lithostratigraphic units. The results of this study can be corroborated by seismic data to explore offshore areas of the Laptev and East Siberian seas. We also present detailed data on the geochemistry of organic matter from the Pestsovaya Formation (Hettangian-lowermost Upper Pliensbachian).