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Methane seepage in the Shenhu area of the northern South China Sea: constraints from carbonate chimneys
Guan, Hongxiang1; Zhang, Mei1; Mao, Shengyi1; Wu, Nengyou2; Lu, Hongfeng3; Chen, Duofu4
2016-06-01
发表期刊GEO-MARINE LETTERS
卷号36期号:3页码:175-186
摘要Two authigenic carbonate chimneys were recovered from the Shenhu area in the northern South China Sea at approximately 400 m water depth. The chimneys' mineralogy, isotopic composition, and lipid biomarkers were studied to examine the biogeochemical process that induced the formation of the chimneys. The two chimneys are composed mostly of dolomite, whereas the internal conduits and semi-consolidated surrounding sediments are dominated by aragonite and calcite. The specific biomarker patterns (distribution of lipids and their depleted delta C-13 values) indicate the low occurrence of methanotrophic archaea ANME-1 responsible for the chimneys' formation via anaerobic oxidation of methane. A significant input of bacteria/planktonic algae and cyanobacteria to the carbon pool during the precipitation of the carbonate chimneys is suggested by the high contributions of short-chain n-alkanes (69% of total hydrocarbons) and long-chain n-alcohols (on average 56% of total alcohols). The oxygen isotopic compositions of the carbonate mixtures vary from 3.1aEuro degrees to 4.4aEuro degrees in the dolomite-rich chimneys, and from 2.1aEuro degrees to 2.5aEuro degrees in the internal conduits, which indicates that they were precipitated from seawater-derived pore waters during a long period covering the last glacial and interglacial cycles. In addition, the mixture of methane and bottom seawater dissolved inorganic carbon could be the carbon sources of the carbonate chimneys.
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
DOI10.1007/s00367-016-0438-6
研究领域[WOS]Geology ; Oceanography
关键词[WOS]GULF-OF-MEXICO ; EASTERN MEDITERRANEAN SEA ; FRESH-WATER ENVIRONMENTS ; ANOXIC MARINE-SEDIMENTS ; AUTHIGENIC CARBONATES ; ANAEROBIC OXIDATION ; COLD-SEEP ; MICROBIAL COMMUNITIES ; CONTINENTAL-SLOPE ; LIPID BIOMARKER
收录类别SCI
语种英语
WOS类目Geosciences, Multidisciplinary ; Oceanography
WOS记录号WOS:000376258800002
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.giec.ac.cn/handle/344007/11443
专题中国科学院广州能源研究所
作者单位1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China
2.Qingdao Inst Marine Geol, Minist Land & Resources, Key Lab Gas Hydrate, Qingdao 266071, Peoples R China
3.Guangzhou Marine Geol Survey, Guangzhou 510760, Guangdong, Peoples R China
4.Shanghai Ocean Univ, Coll Marine Sci, Hadal Sci & Technol Res Ctr, Shanghai 201306, Peoples R China
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Guan, Hongxiang,Zhang, Mei,Mao, Shengyi,et al. Methane seepage in the Shenhu area of the northern South China Sea: constraints from carbonate chimneys[J]. GEO-MARINE LETTERS,2016,36(3):175-186.
APA Guan, Hongxiang,Zhang, Mei,Mao, Shengyi,Wu, Nengyou,Lu, Hongfeng,&Chen, Duofu.(2016).Methane seepage in the Shenhu area of the northern South China Sea: constraints from carbonate chimneys.GEO-MARINE LETTERS,36(3),175-186.
MLA Guan, Hongxiang,et al."Methane seepage in the Shenhu area of the northern South China Sea: constraints from carbonate chimneys".GEO-MARINE LETTERS 36.3(2016):175-186.
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