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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >A novel proxy for terrestrial organic matter in sediments based on branched and isoprenoid tetraether lipids
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A novel proxy for terrestrial organic matter in sediments based on branched and isoprenoid tetraether lipids

机译：基于支链和类异戊二烯四醚脂质的沉积物中陆生有机物的新型替代物

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摘要

We propose a novel tracer for terrestrial organic carbon in sediments based on the analysis of tetraether lipids using high-performance liquid chromatography/mass spectrometry (HPLC/MS). Analysis of terrestrial soil and peats shows that branched tetraether lipids are predominant in terrestrial environments in contrast to crenarchaeol, the characteristic membrane lipid of non-thermophilic crenarchaeota, which is especially abundant in the marine and lacustrine environment. Based on these findings, an index was developed, the so-called Branched and Isoprenoid Tetraether (BIT) index, based on the relative abundance of terrestrially derived tetraether lipids versus crenarchaeol. This BIT index was applied to surface sediments from the Angola Basin, where it was shown to trace the outflow of the Congo River. Furthermore, analyses of particulate organic matter from the North Sea showed relatively higher BIT indices in water column particulate organic matter near large river inputs. A survey of globally distributed marine and lacustrine surface sediments shows that the BIT index in these environments correlates with the relative fluvial input of terrestrial organic material making this index generally applicable. The new proxy allows the rapid assessment of the fluvial input of terrestrial organic material in immature sediments up to 100 Ma old.
机译：基于高效液相色谱/质谱（HPLC / MS）对四醚脂质的分析，我们提出了一种沉积物中陆地有机碳的新型示踪剂。对陆地土壤和泥炭的分析表明，与陆地生物油相比，支链四醚脂质在陆地环境中占主导地位，而颅骨丙烯酸是非嗜热性颅骨植物的特征性膜脂质，在海洋和湖泊环境中尤为丰富。基于这些发现，开发了一种指数，即所谓的支链和类异戊二烯四醚（BIT）指数，该指数基于陆生衍生的四醚脂质与Crenarchaeol的相对丰度。该BIT指数适用于安哥拉盆地的地表沉积物，并显示了刚果河的流出量。此外，对北海颗粒有机物的分析表明，在大河输入附近的水柱颗粒有机物的BIT指数相对较高。对全球分布的海洋和湖泊表层沉积物进行的一项调查显示，这些环境中的BIT指数与陆地有机物质的相对河流输入相关，因此该指数普遍适用。新的代理可以快速评估高达100 Ma的未成熟沉积物中陆地有机物质的河流输入。

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