Predominance of hexamethylated 6-methyl branched glycerol dialkyl glycerol tetraethers in the Mariana Trench: source and environmental implication

Predominance of hexamethylated 6-methyl branched glycerol dialkyl glycerol tetraethers in the Mariana Trench: source and environmental implication
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马里亚纳海沟中六甲基化 6-甲基支链甘油二烷基甘油四醚的优势:来源和环境影响

DOI:
10.5194/bg-2019-391-supplement
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发表时间:
2019-10
期刊:
影响因子:
4.9
通讯作者:
Xu Yunping
Xu Yunping
中科院分区:
地球科学2区
文献类型:
--
作者:
Xiao Wenjie;Wang Yasong;Liu Yongsheng;Zhang Xi;Shi Linlin;Xu Yunping

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抽象。支链甘油二烷基甘油四醚(brGDGT)是 有机碳(OC)源的有用分子指示剂, 古环境然而,它们在海洋环境中的应用 由于混合了陆地和海洋来源而变得复杂。这里我们 研究了马里亚纳海沟沉积物中的brGDGT, 没有明显的地球影响。我们的结果表明, 六甲基化6-甲基brGDGT(IIIa′)占优势(占总brGDGT的73.40± 2.39%),5-甲基brGDGT缺失,不同 从以前报道的土壤和海洋沉积物中, 5-甲基和6-甲基brGDGT。这种独特的功能,结合高 δ 13 COC(-19.82 ~0.25%)、低OC scinTN比值(6.72±0.84)、低分支和类异戊二烯四醚(BIT)指数(0.03±0.01)和高无环六-scinpentamethylated brGDGT比值(7.13±0.98)支持马里亚纳海沟沉积物中的brGDGT是 本地的而不是陆地的产品。文献编纂 数据显示,六甲基化6-甲基化的增加的丰度分数 brGDGT是大陆边缘的一种常见现象, 影响力加大。无环六溴五甲基化 brGDGT比率和brGDGT IIIa′的丰度分数提供了一种新的 方法来区分陆地和海洋来源的brGDGT。
Abstract. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are useful molecular indicators for organic carbon (OC) sources and the paleoenvironment. Their application in marine environments, however, is complicated because of a mixed terrestrial and marine source. Here, we examined brGDGTs in sediments from the Mariana Trench, the deepest ocean without significant terrestrial influence. Our result shows a strong predominance of hexamethylated 6-methyl brGDGT (IIIa′) (73.40±2.39 % of total brGDGTs) and an absence of 5-methyl brGDGTs, different from previously reported soils and marine sediments that comprised both 5-methyl and 6-methyl brGDGTs. This unique feature, combined with high δ13COC (-19.82±0.25 %), low OC∕TN ratio (6.72±0.84), low branched and isoprenoid tetraether (BIT) index (0.03±0.01), and high acyclic hexa- ∕ pentamethylated brGDGT ratio (7.13±0.98), support that brGDGTs in the Mariana Trench sediments are autochthonous rather than terrestrial products. The compiling of literature data shows that the enhanced fractional abundance of hexamethylated 6-methyl brGDGTs is a common phenomenon in continental margins when the marine influence was intensified. The cross plot of acyclic hexa- ∕ pentamethylated brGDGT ratio and fractional abundance of brGDGT IIIa′ provide a novel approach to distinguish terrestrial and marine-derived brGDGTs.
DOI: 10.1073/pnas.1909306116
发表时间: 2019-10
期刊: Proceedings of the National Academy of Sciences
影响因子: --
作者:
Z. Zeng;Xiao-Lei Liu;Kristen R Farley;Jeremy H. Wei;W. Metcalf;R. Summons;P. Welander
通讯作者: Z. Zeng;Xiao-Lei Liu;Kristen R Farley;Jeremy H. Wei;W. Metcalf;R. Summons;P. Welander
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发表时间: 2006-09-01
影响因子: 4.5
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DOI: 10.1073/pnas.1805186115
发表时间: 2018-10-23
影响因子: 11.1
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DOI: 10.1038/s41598-017-17964-0
发表时间: 2018-01-09
期刊: Scientific reports
影响因子: 4.6
作者:
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DOI: 10.1016/s0146-6380(97)00049-1
发表时间: 1997-10-01
影响因子: 3
作者:
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