KS-1 BOREHOLE (KHATANGA BAY COAST, LAPTEV SEA): A UNIQUE ARCHIVE OF LATE PALEOZOIC – MESOZOIC CLIMATE OSCILLATIONS IN THE NORTHERN SIBERIA INFERRED FROM GLENDONITE OCCURRENCES
K.Yu. Vasileva1,2, M.A. Rogov1,3, V.A. Zakharov 1, B.L. Nikitenko 4, E.B. Pestchevitskaya 4,
A.V. Yadrenkin4, N.K. Lebedeva4, A.A. Goryacheva4, S.N. Khafaeva4, N.A. Malyshev5, V.E. Verzhbitsky5, G.V. Ulyanov6, V.V. Obmetko5, A.A. Borodulin5
1Geological institute of RAS, Moscow, Russia
2Saint Petersburg State University, St. Petersburg, Russia
3Arctic Research Center (ARC), Moscow, Russia
4The Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences (IPGG SB RAS), Novosibirsk,Russia
5Rosneft, Moscow, Russia
6JSC “RN-GIR” Moscow branch – center for technical competentions IGIRGI, Moscow, Russia
Keywords: glendonite, Permian, Jurassic, Cretaceous, climatic fluctuations, paleogeography, Arctic
Abstract
We present data on the findings of glendonites (pseudomorphs of the cold-water mineral ikaite) in Permian, Jurassic and Lower Cretaceous sedimentary rocks, penetrated by well KS-1, drilled on the coast of the Laptev Sea. This is the only section in the world that contains glendonites of both Paleozoic and Mesozoic age, belonging to a vast time interval including three geological systems. Glendonites are found here in all stages from which they are known in northern Siberia, with the exception of those stratigraphic intervals in which glendonite finds are comparatively rare (Oxfordian, Ryazanian and Valanginian stages). KS-1 well is a unique natural archive, which reflects the most significant cooling events in the studied region during the late Paleozoic-Mesozoic.
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