从陆地到海洋:横跨新Dryas-全新世的格陵兰岛东北陆架海洋沉积物记录中有机物的来源、组成和保存

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Boreas Pub Date : 2023-08-07 DOI:10.1111/bor.12630
Nanna Andreasen, Rebecca Jackson, Arka Rudra, Henrik Nøhr-Hansen, Hamed Sanei, Jørgen Bojesen-Koefoed, Marit-Solveig Seidenkrantz, Christof Pearce, Nicolas Thibault, Sofia Ribeiro
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引用次数: 0

摘要

海洋沉积物的有机质含量经常被用来推断过去海洋条件的变化。然而,保存在沿海沉积物中的有机碳库是来自不同来源的复杂混合物,可能不能反映原位过程。在这项研究中,我们将改造后的岩相形态的分类鉴定与热解有机地球化学和反射光有机岩石显微镜相结合,研究了东北格陵兰陆架海洋沉积物岩心中有机质的来源、组成和保存情况。我们的研究表明,在整个新仙女木晚期-全新世期间,陆源有机碳不断地向海洋环境输入,其中惰性碳在新仙女木晚期输入最多。虽然沉积物中含有一些近期的海洋地貌,但没有其他证据表明存在新鲜的海洋有机碳。相反,我们的研究结果表明,这些陆架沉积物代表了一个重要的循环有机碳汇。热解地球化学结果表明,沉积物中约90%的有机碳为惰性碳。有机岩相学分析表明,沉积岩心中有机碳含量占总有机碳含量的70% ~ 84%。重新加工的鞭毛藻囊显示了白垩纪陆源物质的连续来源,最有可能来自附近的克拉弗林岛。我们的研究指出,限制海洋沉积物中有机质的来源、组成和保存对于实现基于有机代用物的更精确的古环境重建具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

From land to sea: provenance, composition, and preservation of organic matter in a marine sediment record from the North-East Greenland shelf spanning the Younger Dryas–Holocene

From land to sea: provenance, composition, and preservation of organic matter in a marine sediment record from the North-East Greenland shelf spanning the Younger Dryas–Holocene

The organic matter content of marine sediments is often used to infer past changes in ocean conditions. However, the organic carbon pool preserved in coastal sediments is a complex mixture derived from different sources and may not reflect in situ processes. In this study, we combine taxonomic identification of reworked palynomorphs with pyrolysis organic geochemistry and reflected-light organic petrographic microscopy to investigate the provenance, composition and preservation of organic matter in a marine sediment core retrieved from the NE Greenland shelf. Our study reveals continuous yet variable input of land-derived organic carbon to the marine environment throughout the late Younger Dryas–Holocene, with the highest input of inert carbon in the late Younger Dryas. Although the sediments contain some recent marine palynomorphs, there is no other evidence of fresh marine organic carbon. In contrast, our results indicate that these shelf sediments represent a significant sink of recycled organic carbon. The results of pyrolysis geochemistry revealed that ~90% of the total organic carbon in the sediments is inert. The organic petrography analyses revealed that >70–84% of the organic carbon in the sediment core is terrigenous. Reworked dinoflagellate cysts showed a continuous provenance of Cretaceous land-derived material, most likely from the nearby Clavering Island. Our study points to the importance of constraining the organic matter origin, composition and preservation in marine sediments to achieve more accurate palaeoenvironmental reconstructions based on organic proxies.

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来源期刊
Boreas
Boreas 地学-地球科学综合
CiteScore
5.90
自引率
4.50%
发文量
36
审稿时长
>12 weeks
期刊介绍: Boreas has been published since 1972. Articles of wide international interest from all branches of Quaternary research are published. Biological as well as non-biological aspects of the Quaternary environment, in both glaciated and non-glaciated areas, are dealt with: Climate, shore displacement, glacial features, landforms, sediments, organisms and their habitat, and stratigraphical and chronological relationships. Anticipated international interest, at least within a continent or a considerable part of it, is a main criterion for the acceptance of papers. Besides articles, short items like discussion contributions and book reviews are published.
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