南海东沙东北部甲烷缺氧氧化作用的生物标志化合物及其碳同位素组成

于晓果; 韩喜球; 李宏亮; 金肖兵; 龚建明; ErwinSUESS; 黄永样; 吴能友; 苏新

南海东沙东北部甲烷缺氧氧化作用的生物标志化合物及其碳同位素组成

1.
国家海洋局第二海洋研究所国家海洋局海底科学重点实验室, 浙江杭州 310012
2.
中国地质调查局青岛海洋地质研究所, 山东青岛 266071
3.
Leibniz-Institute for Marine Sciences, Kiel, Germany, 24148;German Marine Research Consortium, 10117
4.
广州海洋地质调查局, 广州 510760
5.
中国地质大学, 海洋学院, 北京 100083

基金项目: 南海东沙海域贫/缺氧甲烷氧化作用的分子化石与氮同位素特征及成因机制研究(40576059);冷泉碳酸盐岩记录:甲烷的源与汇及其对全球气候变化的影响研究(40476050);国家重点基础研究发展规划项目(2007CB411704)

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出版历程
- 收稿日期: 2007-03-25
- 修回日期: 2007-07-12

Biomarkers and carbon isotope composition of anaerobic oxidation of methane in sediments and carbonates of northeastern part of Dongsha, South China Sea

1.
KLSG, Second Institute of Oceanography of the State Oceanic Administration, Hangzhou 310012, China
2.
Qingdao Institute of Marine Geology of China Geology Survey, Qingdao 266071, China
3.
Leibniz-Institute for Marine Sciences, 24148 Kiel, Germany;German Marine Research Consortium, 10117 Berlin, Germany
4.
Guangzhou Marine Geology Survey, Guangzhou, Guangdong 510760, China
5.
China University of Geosciences, Beijing 100083, China

摘要

摘要: 南海东沙东北部碳酸盐岩和泥质沉积物中的生物标志化合物组合及其碳同位素组成分析表明,研究区内甲烷缺氧氧化作用(anaerobic oxidation of methane-AOM)发育.研究区内碳酸盐岩中含丰富的AOM标志化合物,2,6,11,15-四甲基十六烷(Crocetane-Cr.)、2,6,10,15,19-五甲基番茄烷(Pentamethylicosane-PMI)和2,6,10,15,19,23-六甲基二十四烷(Squalane-Sq角鲨烷)的¹³C亏损强烈(δ¹³C值介于-74.2‰~-119.0‰PDB之间),表明碳酸盐岩形成于AOM,同时反映该研究区曾发生过强烈、持续的富CH₄流体释放活动.柱状泥质沉积物中,AOM生物标志化合物在硫酸岩-甲烷过渡带(SMI-Sulfate-Methane Interface)边界附近相对丰度高,SMI之上样品中含量低,或未检出,表明现代环境在SMI附近有大量嗜甲烷微生物生长,使得深部上升的甲烷被大量消耗,很少有甲烷逸出海底.AOM生物标志化合物可用来指示SMI边界.不同站位、不同岩性AOM生物标志化合物组成(包括碳同位素组成)的差异反映了嗜甲烷古细菌组成的不同.
- 甲烷缺氧氧化作用 /
- 天然气水合物 /
- 生物标志化合物 /
- 碳同位素组成 /
- 冷泉碳酸盐岩
Abstract: Sediments and aut higenic carbonates from the Dongsha region of the South China Sea show abundant AOM-related biomarkers(C₂₀ Crocetane,C₂₅ Pentamet hylicosane,C₃₀ Squalane) with highly depleted δ¹³C(δ¹³C=-74.2‰ to -119.0‰ PDB) signatures.These data identify the authigenic carbonates as micro bially-mediated methane-derived precipitates.Furthermore,the distribution of AOM-biomarkers in sediments indicates that the modern AOM-process occurs around 600cm below seafloor,coincident with the sulfate-methane-interface(SMI).Above the SMI,the content of AOM-related biomarkers is either very low or undet ectable.This implies that abundant methane consuming microbes thrieve just at the SMI and that methane becomes largely exhausted by methanotrophy before it reaches the seafloor.It is suggested that AOM-biomar kers serve as indicat or of SMI.We conclude that vigorous met hane-rich fluid expulsion has occurred at the seaflo or when the carbonates formed,while the fluidactivity within the sediment is rather weak.
- anaerobic oxidation of methane /
- gas hydrate /
- biomarker /
- isotope composition /
- cold vent carbonate

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