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

YU Xiao-guo; HAN Xi-qiu; LI Hong-liang; JIN Xiao-bin; GONG Jian-min; Erwin SUESS; HUANG Yong-yang; WU Neng-you; SU Xin

Volume 30 Issue 3

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Article Navigation > Haiyang Xuebao > 2008 > 30(3): 77-84

YU Xiao-guo, HAN Xi-qiu, LI Hong-liang, JIN Xiao-bin, GONG Jian-min, Erwin SUESS, HUANG Yong-yang, WU Neng-you, SU Xin. Biomarkers and carbon isotope composition of anaerobic oxidation of methane in sediments and carbonates of northeastern part of Dongsha, South China Sea[J]. Haiyang Xuebao, 2008, 30(3): 77-84.

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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

Received Date: 2007-03-25
Rev Recd Date: 2007-07-12

Abstract

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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References

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