Gas-Geochemical Features of Bottom Sediments in the Linear Depression Zone of the West Kara Stage
- 作者: Sevastyanov V.S.1, Fedulova V.Y.1, Moroz E.A.2, Krasnova E.A.1,3, Naymushin S.G.1, Dushenko N.V.1, Voropaev S.A.1, Dolgonosov A.A.1
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隶属关系:
- Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences
- Geological Institute of Russian Academy of Sciences
- Lomonosov Moscow State University
- 期: 卷 65, 编号 2 (2025)
- 页面: 243-252
- 栏目: Химия моря
- URL: https://journals.eco-vector.com/0030-1574/article/view/684020
- DOI: https://doi.org/10.31857/S0030157425020053
- EDN: https://elibrary.ru/DYBEXS
- ID: 684020
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详细
During the 89th cruise of the R/V Academic Mstislav Keldysh in 2022, sediment columns were sampled at stations 7441 and 7444 located in the southwestern part of the Kara Sea. Station 7444 was located on a large submeridional depression, under the bottom of which gas-saturated sedimentary strata were detected. Background station 7441 was located at a distance of 68 km from station 7444. For the sediments of the background station 7441, the ratio of hydrocarbon gases C1 / C2+ < 100 indicated their thermogenic nature. In the sediment at station 7441, the formation of the gas component in the sediment was due to degradation of OM and inflow of thermogenic gases, while in the sediment of station 7444 there was an inflow of biogenic gas, apparently, from permafrost. The average concentration of CH4 in the sediment of station 7444 exceeded the average concentration in the sediment of column 7441 by 700 times, and the average concentrations of CO2 in the sediment of stations 7444 and 7441 were comparable. A sulfate-methane transition zone (SMTZ) was detected at the 541–545 cm horizon of the sediment of station 7444, where sulfate concentration decreased to minimum values, CH4 and CO2 concentrations reached maximum values. The sulfur isotopic composition of δ34S in this region was +20.8‰. The biogenic nature of gas in the sediment of station 7444 was evidenced by low values of the carbon isotopic composition of CH4 (mean value δ13C(CH4) = –99.7‰), and high C1 / C2+ > 10000 ratio near the SMTZ.
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作者简介
V. Sevastyanov
Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences
编辑信件的主要联系方式.
Email: vsev@geokhi.ru
俄罗斯联邦, Moscow
V. Fedulova
Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences
Email: vsev@geokhi.ru
俄罗斯联邦, Moscow
E. Moroz
Geological Institute of Russian Academy of Sciences
Email: vsev@geokhi.ru
俄罗斯联邦, Moscow
E. Krasnova
Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences; Lomonosov Moscow State University
Email: vsev@geokhi.ru
俄罗斯联邦, Moscow; Moscow
S. Naymushin
Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences
Email: vsev@geokhi.ru
俄罗斯联邦, Moscow
N. Dushenko
Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences
Email: vsev@geokhi.ru
俄罗斯联邦, Moscow
S. Voropaev
Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences
Email: vsev@geokhi.ru
俄罗斯联邦, Moscow
A. Dolgonosov
Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences
Email: vsev@geokhi.ru
俄罗斯联邦, Moscow
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