Abstract
The results of studying the content, composition, and distribution of chloroform bitumoids (CBs) in the Holocene sediments of the Barents Sea (cruise 68 of the R/V Akademik Mstislav Keldysh, July–August 2017) are presented. Depending on the sedimentation conditions, CB concentrations varied, on average, as follows (μg of dry weight): Novaya Zemlya archipelago (174) > Svalbard archipelago (131) > Western part (78) > Central part (68) > Franz Josef Land (52). Hydrocarbons were almost half in the CB composition (46% on average, 85% maximum). The distribution of CBs by burial depth has a varying character and depended not only on the grain-size composition of sediments and the content of organic matter, but also on the variability of redox conditions and endogenous flows from a sedimentary stratum. Therefore, the composition markers of alkanes and the IR-Fourier spectra indicated both hydrocarbon sources: sedimentary (Murmansk bank, Franz Josef Land shelf) and point endogenous oil ones (the Svalbard archipelago shelf, the Medvezinskii trench).
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Funding
Sampling was supported by Program IX.131.1; the results were obtained within the scope of a State Assignment (project no. 0149–2019–0007); the work on generalizing the results and the preparation for publication were funded by the Russian Science Foundation, project no. 19–17–00234 and project no. АААА–А17–1170400710036–4.
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Translated by L. Mukhortova
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Nemirovskaya, I.A., Lobkovsky, L.I. & Glyaznetsova, Y.S. Bitumoids of Holocene Sediments in the Barents Sea. Dokl. Earth Sc. 493, 612–616 (2020). https://doi.org/10.1134/S1028334X20080164
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DOI: https://doi.org/10.1134/S1028334X20080164