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Temperature, composition and age of the Kara Sea Shelf sediments in the area of the Marre-Sale Geocryological Station

Abstract

The paper presents results of the study of the uppermost 20 m-thick layer of the near-Yamal shelf bottom sediments, penetrated in May 2014 by two VSEGINGEO boreholes equipped with LРС loggers, with an aim of the temperature regime dynamics monitoring in the nearshore bottom sediments, both for the research purposes and in as much as the data add value to the forthcoming hydrocarbon resource development on the Russian continental shelf. On the basis of the temperature variation observations during three summer months of 2014, it has been established that marine silty clays and aleurites composing the bottom sediment section, represent relict frozen deposits subjected to cryogenic metamorphism in the subaerial exposure environment. Diatom assemblages occurring in aleurite and clayey deposits consist exclusively of the marine extinct species typical of the Early Eocene Pyxilla gracilis diatom zone. A modern marine sublittoral diatom assemblage is found inhabiting the sands of the upper part of the onshore borehole section

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