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
中科院分区:
文献类型:
--
作者:
Xiao Wenjie;Wang Yasong;Liu Yongsheng;Zhang Xi;Shi Linlin;Xu Yunping
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.
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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
影响因子:
4.5
作者:
Herfort, Lydie;Schouten, Stefan;Damste, Jaap S. Sinninghe
通讯作者:
Damste, Jaap S. Sinninghe
DOI:
10.1073/pnas.1805186115
发表时间:
2018-10-23
影响因子:
11.1
作者:
Weber Y;Sinninghe Damsté JS;Zopfi J;De Jonge C;Gilli A;Schubert CJ;Lepori F;Lehmann MF;Niemann H
通讯作者:
Niemann H
影响因子:
4.6
作者:
Wang M;Zong Y;Zheng Z;Man M;Hu J;Tian L
通讯作者:
Tian L
影响因子:
3
作者:
Meyers, PA
通讯作者:
Meyers, PA