详细
Data are presented on the content and composition of hydrocarbons: aliphatic (AHCs) and polycyclic aromatic hydrocarbons (PAHs) in Holocene sediments (undisturbed cores 0–30 cm) collected in the southwestern region of the Kara Sea (I part of cruise 89 of the R/V Akademik Mstislav Keldysh”, September 2022). It has been established that the distribution of hydrocarbons, unlike Corg, does not depend on the lithotype of bottom sediments, since in the gas-saturated zone, along with methane, the formation of high molecular weight hydrocarbons occurs. This leads to an increase in the proportion of AHCs (>1%) and PAHs (>1×10–3%) in the composition of TOC, as well as a change in their distribution and composition in the sedimentary sequence. In the lower horizons of the columns, the composition of hydrocarbons becomes more autochthonous. Changes in redox-potential in sedimentary strata also affect the concentrations and composition of hydrocarbons.