Abstract
The results on the content, composition, and distribution of chloroform bitumoids (CBs) in the Holocene sediments of the Barents Sea are presented (Cruise 68 of the R/V Akademik Mstislav Keldysh, July–August 2017). Depending on the sedimentation conditions, CB concentrations varied on average (μg/g of dry mass) as follows: Novaya Zemlya Archipelago (174) > Svalbard Archipelago (131) > Western part (78) > Central part (69) > Franz Josef Land (52). Hydrocarbons comprised almost half (46% on average with the maximum of 85%) in the composition of CBs. Their distribution in the thickness of sediments is different and depends not only on the particle-size composition of sediments and the content of organic matter in them, but also on the variability of redox conditions and fluid flows of hydrocarbons from a sedimentary stratum. Therefore, markers of alkane composition and IR-Fourier spectra indicated both sedimentary (Murmansk bank, the Franz Josef Land shelf) and point oil (shelf of Svalbard Archipelago, Medvezhinskii Trench) sources of hydrocarbons.
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Funding
The sampling was supported by Program IX.131.1, the data were obtained in the framework of a state assignment (topic no. 0128-2019-0011), and the data generalization and preparing for publication were supported by the Russian Scientific Foundation (projects nos. 19–17-00234 and АААА-А17–1170400710036-4).
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Translated by I. Bel’chenko
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Glyaznetsova, Y.S., Nemirovskaya, I.A. Features of Bitumoid Distribution in Bottom Sediments of the Barents Sea. Oceanology 60, 831–839 (2020). https://doi.org/10.1134/S0001437020050057
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DOI: https://doi.org/10.1134/S0001437020050057