The molecular composition and distribution of the concentration of n-alkanes are considered for sediments of boreholes drilled in the shallow part of the Laptev Sea, in the area of Buor Khaya Gulf. The diverse molecular composition of n-alkanes is dominated by long-chain odd homologs, which indicate terrigenous organic matter (OM). Heterogeneous distribution and burial of OM are shown under conditions of pulsating contribution of river and thermoabrasive material and multiple changes in them up to hiatuses in sedimentation.

New data on the particle size composition of the Laptev Sea shelf deposits were obtained on the basis of results of low-angle laser light-scattering of core samples from the columns studied. It was...

The paper provides information about a complex of geological studies in Chaun Bay in the East Siberian Sea during cruise 60 of the R/V Akademik Oparin in October 2020. Preliminary results of the scientific expedition are discussed.

It is shown for the first time that the proportion of lignin in shelf deposits may range from 1/3 to the total concentration of organic carbon. The distribution of wood residues and lignin in the...

The paper presents the results of grain size analysis of bottom sediments and subsea permafrost from three cores drilled in Buor-Khaya Bay. A pronounced lithologic differentiation of the studied terrigenous deposits were revealed, as well as a wide variety of grain size and genetic types of deposits accumulated in various natural environments. The most of investigated sediments are represented by alluvial sands with wide range of size, pelletizing, and sorting rates. The accumulation of these sands was closely related to the dynamics of riverine flow, slope processes, and coastal erosion and abrasion. The fine sediment fraction is poorly sorted compared to sands. According to the dataset, the predominantly detrital nature of the sedimentary material and its continental origin have been established.