ORGANIC CARBON IN SURFACE SEDIMENTS OF LAPTEV SEA AND EAST SIBERIAN SEA: OBSERVATION OF PYROLYSIS DATA

被引:1
|
作者
V. Gershelis, Elena [1 ]
Ruban, Alexey S. [1 ]
Chernykh, Denis V. [2 ,3 ]
Poltavskaya, Natalina A. [1 ]
Semiletov, Igor P. [1 ,2 ,3 ]
机构
[1] Natl Res Tomsk Polytech Univ, 30, Lenin Ave, Tomsk 634050, Russia
[2] Russian Acad Sci, Pacific Oceanol Inst, 43, Baltiyskaya St, Vladivostok 690041, Russia
[3] Natl Res Tomsk State Univ, 36, Lenin Ave, Tomsk 634050, Russia
基金
俄罗斯科学基金会;
关键词
Bottom sediments; organic matter; hydrocarbons; organic carbon isotopic composition; Arctic; Laptev Sea; East Siberian Sea; ROCK-EVAL PYROLYSIS; MARINE-SEDIMENTS; MATTER; PERMAFROST; RELEASE; COASTAL;
D O I
10.18799/24131830/2023/4/4082
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Ongoing global warming accelerates release of relict terrigenous organic carbon from permafrost onto the Arctic shelf waters. When trans-ported in the land-sea system, it can further be accumulated in bottom sediments in the shelf or deep-sea zone and undergo degradation and remineralization, which leads to critical environmental consequences. This study aims at assessing the sources and degradation de-gree of terrigenous organic matter in the surface sediments of the Eastern Arctic seas. Within this study, marine bottom sediments taken from the surface horizon (0-10 cm) were investigated. Sampling was carried out during the 2011-2019 marine research expeditions. La-teral consistency of hydrogen index values in modern marine sediments on the Eastern Arctic shelf (mainly in the Laptev Sea) is associat-ed with the great contribution of heterogeneous biolabile terrestrial organic matter, in contrast to other Arctic waters, where growing hydro-gen index values are associated with the consistently growing contribution of autochthonous organic matter with increasing distance from the coast. While considering the d13C and HI/OI correlation, there are also significant deviations from the linear dependence which usually indicates a conservative marine geochemical regime. Sediments of the Buor-Khaya Bay are characterized by an increased HI/OI values in contrast to the deep-water sediments of the continental slope which shows lower hydrogen content and a higher proportion of oxygen -containing compounds, indicating a strong transformation of organic matter. These findings confirm a key role of terrigenous supply in spe-cific biogeochemical conditions in the studied area and reveal that geochemical indicators of immature organic matter sources in the East-ern Arctic seas should be interpreted differently from other Arctic continental margins.
引用
收藏
页码:149 / 162
页数:14
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