The effect of methane seeps on the bacterial tetraether lipid distributions at the Okinawa Trough

The effect of methane seeps on the bacterial tetraether lipid distributions at the Okinawa Trough
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甲烷渗漏对冲绳海槽细菌四醚脂质分布的影响

DOI:
10.1016/j.marchem.2020.103845
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发表时间:
2020-09
期刊:
影响因子:
3
通讯作者:
Xiaotong Peng
Xiaotong Peng
中科院分区:
地球科学2区
文献类型:
--
作者:
Zhe-Xuan Zhang;Jiwei Li;Zhiyan Chen;Zhilei Sun;Huan Yang;Meiyan Fu;Xiaotong Peng

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支链甘油二烷基甘油四醚(brGDGT)可以在湖泊的甲烷氧化/缺氧条件下原位生产。然而,广泛分布的海底甲烷渗漏中的动态甲烷氧化活动对全球大陆边缘 brGDGT 分布的影响仍然是个谜。在本研究中,我们基于对从冲绳海槽(OT)北段收集的自生碳酸盐中四醚脂质分布的分析,首次报道了冷泉环境中原位产生的brGDGT的出现。东海自生碳酸盐岩中isoGDGTs与brGDGTs的丰度比(Ri/b)(0.94~2.25)远低于邻近的正常海洋沉积物(>10)和悬浮颗粒物(>60)。自生碳酸盐中如此显着较高的细菌分支 GDGT 比率表明,除了陆地和/或水柱输入之外,其还有其他来源。具体而言,brGDGT (Ia)、brGDGT (IIa) 和 brGDGT (IIa’) 似乎形成原位冷渗,并受到甲烷通量的显着影响,如沿着管道横断面的 GDGT 丰度分数、网络分析以及甲烷指数 (MI) 和 brGDGT 之间的相关性所示。我们的研究强调,海底甲烷渗漏的分布可能会影响海洋中细菌四醚脂质的分布,这将阻碍基于 brGDGT 的代理在海洋环境中的陆源有机碳追踪和古气候重建中的普遍应用。
The branched glycerol dialkyl glycerol tetraethers (brGDGTs) can be producedin situunder methanotrophic/hypoxic conditions in lakes. However, the effect of dynamic methanotrophic activities in the widely-distributed seafloor methane seeps on brGDGTs distributions in global continent margins remains enigmatic. In this study, we firstly report the occurrence ofin situproduced brGDGTs in cold seep environments, based on the analysis of tetraether lipid distributions in the authigenic carbonates collected from the northern section of the Okinawa Trough (OT). The abundance ratio of isoGDGTs to brGDGTs (Ri/b) was much lower in the authigenic carbonates (0.94 to 2.25) than in the adjacent normal marine sediments (>10) and suspended particulate matter (>60) in the East China Sea (ECS). Such significant higher bacterial branched GDGTs ratios in the authigenic carbonates indicate its additional sources besides terrestrial and/or water column inputs. Specifically, the brGDGT (Ia), brGDGT (IIa) and brGDGT (IIa’) appear to formin situin cold seeps, and are influenced by the methane flux significantly as indicated by the fractional abundances of GDGTs along the transect of pipes, network analysis, and correlations between Methane Index (MI) and brGDGTs. Our study highlights that the distributions of seafloor methane seeps could impact the bacterial tetraether lipid distributions in ocean, which would hamper the universal application of brGDGT-based proxies for terrigenous organic carbon tracing and paleoclimate reconstruction in marine environments.
东海沉积物中的甘油二烷基甘油四醚特征及其对海洋和大陆气候和环境记录的意义
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