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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