A novel proxy for terrestrial organic matter in sediments based on branched and isoprenoid tetraether lipids
A novel proxy for terrestrial organic matter in sediments based on branched and isoprenoid tetraether lipids
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DOI：
10.1016/j.epsl.2004.05.012
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发表时间：
2004-07-30
影响因子：
5.3
通讯作者：
Schouten, S
中科院分区：
文献类型：
--
作者：
Hopmans, EC;Weijers, JWH;Schouten, S
我们基于使用高效液相色谱/质谱（HPLC/MS）分析四醚脂质，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，支链四醚脂质在陆地环境中占主导地位，而骨裂菌是非嗜热骨裂菌的特征性膜脂，在海洋和湖泊环境中尤其丰富。基于这些发现，开发了一个指数，即所谓的支链和类异戊二烯四醚 (BIT) 指数，该指数基于陆地来源的四醚脂质与 crenarchaeol 的相对丰度。该 BIT 指数应用于安哥拉盆地的表层沉积物，显示该指数可追踪刚果河的流出。此外，对北海颗粒有机物的分析表明，靠近大型河流入海口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面沉积物的调查表明，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，使得该指数普遍适用。新的代理可以快速评估年龄不超过 100 Ma 的未成熟沉积物中陆地有机物质的河流输入。 (C) 2004 ElsevierB.V.版权所有。
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. (C) 2004 ElsevierB.V. All rights reserved.