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

Article Contents

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.

Citation:

PDF( 1986 KB)

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

FullText(HTML)

References(28)

References

宋海斌,耿建华,WANG How king,等.南海北部东沙海域天然气水合物的初步研究[J].地球物理学报,2001,44(5):668-694.

张光学,黄永样,祝有海,等.南海天然气水合物的成矿远景[J].海洋地质与第四纪地质,2002,22(1):75287.

姚伯初.南海北部陆缘天然气水合物初探[J].海洋地质与第四纪地质,1998,18(4):171-181.

姚伯初.南海的天然气水合物矿藏[J].热带海洋学报,2001,20(2):20-281.

姚伯初.南海天然气水合物的形成和分布[J].海洋地质与第四纪地质.2005,25(2):81-90.

王宏斌,张光学,扬木壮,等.南海陆坡天然气水合物成藏的构造环境[J].海洋地质与第四纪地质,2003,23(1):81-86.

于兴河,张志杰.南海北部陆坡区新近系沉积体系特征与天然气水合物分布的关系[J].中国地质,2005,32(3):470-476.

苏新,陈芳,于兴河,等.南海陆坡中新世以来沉积物特性与气体水合物分布初探[J].现代地质,2005,19(1):1-13.

吴必豪,张光学,祝有海,等.中国近海天然气水合物的研究进展[J].地学前缘,2003,10(1):177-189.

蒋少涌,杨涛.薛紫晨,等.南海北部海区海底沉积物中孔隙水的Cl和SO₄^2-浓度异常特征及其对天然气水合物的指示意义[J].现代地质,2005,19(1):45-54.

孙春岩,王宏愈,牛滨华,等.西沙海槽研究区天然气水合物地球化学勘探[J].地球科学,2004,29(2):135-140.

SUESS E.RV SONNE Cruise Report SO 177,Sino——German Cooperative Project,South China Sea Continental Margin:Geological Methane Budget and Environmental Effects of Methane Emissions and Gashydrates.IFM——GEOMAR Reports,2005.http://store.pangaea.de/documentation/Reports/SO177.pdf

REEBURGH W S."Soft spots"in the global methane budget[C]//LIDSTROM M E,TABITA F R.Microbial Growth on C₁ Compounds.Dordrecht:Kluwer Academic Publishers,1996:334-342.

BOETIUS A,RAVENSCHLAG K,SCHUBERT C J,et al.A marine microbial consortium apparently mediating anaerobic oxidation of methane[J],Nature,2000,407:623-626.

ORPHAN V J,HOUSE C H,HINRICHS K-U,et al.Methane——consuming archaea revealed by directly coupled isotopic and phylogenetic analysis[J].Science,2001,293(7):484-487

HINRICHS K-U,HAYES J M,SYLVA S P,et al.Methane-consuming archaebacteria in marine sediments[J].Nature,1999,398:802-805.

PANCOST R D,SINNINGHE DAMSTE J S.Carbon isotopic compositions of prokaryotic lipids as tracers of carbon cycling in diverse settings[J].Chemical Geology,2003,195(1):29-58.

ELVERT M,SUESS E,GREINERT J,et al.Archaea mediating anaerobic methane oxidation in deep-sea sediments at cold seeps of the eastern Aleutian subduction zone[J].Org Geochem,2000,31:1175-1187.

ELVERT M,SUESS E,WHIT1CAR M J.Anaerobic methane oxidation associated with marine gas hydrates:superlight C——isotopes from saturated and unsaturated C₂₀ and C₂₅irregular isoprenoids[J].Naturwissenschaften,1999,86:295-30.

PECKMANN J,THIEL V.Carbon cycling at ancient methane-seeps[J].Chemical Geology,2004,205 (3):443-467.

陈多福,黄永样,冯东,等.南海北部冷泉碳酸盐岩和石化微生物细菌及地质意义[J].矿物岩石地球化学通报,2005,24(3):185-189.

于晓果,李家彪.陈建芳,等.南海东沙海域表层沉积物碳、氧稳定同位素与分布生物标志化合物组合特征及缺氧甲烷氧化作用标志[C]//郑玉龙.海底科学战略研讨会论文集.北京:海洋出版社,2005:148-154.

HAN X Q,SUESS E,HUANG Y Y,et al.Shipboard scientists of Leg SO——177,2005.Jiulong methane reef:first direct evidence of methane seepage in the South China Sea[J].Geophysical Research Abstracts,European Geosciences Union,2005,7:04055.

HAN,X Q,SUESS E,HUANG Y Y,et al.Jiulong Methane Reef:Microbial mediation of seep——carbonates in the South China Sea[J].Marine Geology,2008,249:243-256.

HINRICHS K-U,SUMMONS R E,ORPHAN V,et al.Molecular and isotopic analysis of anaerobic methane——oxidizing communities in marine sediments[J].Org Geochem,2000,31:1685-1701.

FREEMAN K H,WAKEHAM S G,HAYES J M.Predictive isotopic biogeochemistry:hydrocarbons from anoxie marine basins[J].Organic Geochemistry,1994,21:629-644.

PECKMANN J,REIMER A,LUTH U,et al.Methane-derived carbonates and authigenic pyrite from the northwestern Blake Sea[J].Marine Geology,2001,177:129-150.

PANCOST R D,ZHANG C L,TAVACOLI J,et al.Lipid biomarkers preserved in hydrate——associated authigenic carbonate rocks of the Gulf of Mexico[J].Palaeogeography,Palaeoclimatology,Palaeoecology,2005,227:48-66.

Relative Articles

Supplements(0)

Cited By

Proportional views