Abstract
Organic matter in 214 samples of sediments was analysed and numerous evidences for its autochthonous character were identified. With sea depth growth, the content of Corg, free neutral bitumens, hydrocarbons and the high-molecular normal alkanes increases subsequently. The hydrocarbons are second in a row in the balance of bitumens following the resins and are preceding the asphaltene components. The bitumens in the Holocene and Pleistocene sediments are featured for slight HCs increase; however, a sharp drop of resins in their resinous-asphaltene portion is recorded. The same trend is pointed for the naphthene-aromatic fraction at dominantly methane-napthene composition of the hydrocarbons. The conditional content of high-molecular normal alkanes (C27 – C31) goes up despite their prevalence in the hydrocarbons of all groups of sediments.
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