Features of the Hydrocarbon Distribution in the Bottom Sediments of the Norwegian and Barents Seas

The results of the study of hydrocarbons (HCs): aliphatic (AHCs) and polycyclic aromatic hydrocarbons (PAHs) in bottom sediments (2019 and 2020, cruises 75 and 80 of the R/V Akademik Mstislav Keldysh) in the Norwegian-Barents Sea basin: Mohns Ridge, shelf Svalbard archipelago, Sturfiord, Medvezhinsk...

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Bibliographic Details
Published in:Fluids
Main Authors: Inna A. Nemirovskaya, Anastasia V. Khramtsova
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2021
Subjects:
hydrocarbons (aliphatic and polycyclic aromatic hydrocarbons)
organic matter
bottom sediments
alkanes
fluid flows
Norwegian Sea
Thermodynamics
QC310.15-319
Descriptive and experimental mechanics
QC120-168.85
Svalbard
Barents Sea
Svalbard Archipelago
Novaya Zemlya
Online Access:https://doi.org/10.3390/fluids6120456
https://doaj.org/article/8c87d67b11ef4617a9fced0ef6ee089e
Description
Summary:The results of the study of hydrocarbons (HCs): aliphatic (AHCs) and polycyclic aromatic hydrocarbons (PAHs) in bottom sediments (2019 and 2020, cruises 75 and 80 of the R/V Akademik Mstislav Keldysh) in the Norwegian-Barents Sea basin: Mohns Ridge, shelf Svalbard archipelago, Sturfiord, Medvezhinsky trench, central part of the Barents Sea, Novaya Zemlya shelf, Franz Victoria trough are presented. It has been established that the organo-geochemical background of the Holocene sediments was formed due to the flow of sedimentary material in the coastal regions of the Barents Sea on shipping routes. The anthropogenic input of HCs into bottom sediments leads to an increase in their content in the composition of C org (in the sandy sediments of the Kaninsky Bank at an AHC concentration up to 64 μg/g, when its proportion in the composition of C org reaches 11.7%). The endogenous influence on the of the Svalbard archipelago shelf in Sturfiord and in the Medvezhinsky Trench determines the specificity of local anomalies in the content and composition of HCs. This is reflected in the absence of a correlation between HCs and the grain size composition of sediments and C org content, as well as a change in hydrocarbon molecular markers. At the same time, the sedimentary section is enriched in light alkanes and naphthalene’s that may be due to emission during point discharge of gas fluid from sedimentary rocks of the lower stratigraphic horizons and/or sipping migration.

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