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Pore-water dissolved inorganic carbon sources and cycling in the shallow sediments of the Haima cold seeps, South China Sea

文献类型：期刊论文

作者Liu, Weining3; Wu, Zijun3; Wu, Sinan3; Wei, Jiangong2; Peng, Xiaotong1; Li, Jiangtao3; Wang, Yiqing3
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2020-10-01
卷号201页码:12
关键词Dissolved inorganic carbon (DIC) Pore-water geochemistry Anaerobic oxidation of methane (AOM) Haima cold seeps
ISSN号1367-9120
DOI10.1016/j.jseaes.2020.104495
英文摘要Pore-water geochemical compositions provide the insights into seafloor cold seep activities and biogeochemical processes of methane-derived carbon in sediments. In this study, six sediment push cores were collected by manned submersible at the center and edge of the active Haima cold seeps, and a nearby background site. Pore-water compositions of the SO42-, Ca2+, Mg2+, Sr2+, NH4+, dissolved inorganic carbon (DIC), and delta C-13-DIC at each sediments core were measured. The very shallow depths of sulfate-methane transition zone (SMTZ) suggest that high methane flux and significant anaerobic oxidation of methane (AOM) activities occur in the shallow sediments. Reaction-transport modelling results show that the relative contributions of AOM and organoclastic sulfate reduction (OSR) consuming sulfate are 84.1% and 15.9% at site HM-2-6, and 94.6% and 5.4% at site HM-3-3, respectively. Furthermore, extremely low delta C-13-DIC values at the central sites HM-2-6 (-45.67 parts per thousand) and HM-3-3 (-53.87 parts per thousand) indicate an external methane-derived DIC. Based on the delta C-13 mass balance, we quantify the proportions of pore-water DIC derived from organic matter degradation and AOM as 24.7% and 65.3% at site HM-2-6, and 9.3% and 80.7% at site HM-3-3, respectively. An increase in pore-water DIC concentration leads to carbonate precipitation. Plots of Sr/Ca vs. Mg/Ca ratios reveal that the carbonate phases in sediments are dominantly high Mg-calcite in this region. Our study demonstrates that AOM can serve as a dominant biogeochemical process through incorporation of methane-derived carbon into dissolved and solid inorganic carbon phases, significantly influencing DIC cycling within the shallow sediments of the Haima cold seep area.
WOS关键词ANAEROBIC METHANE OXIDATION ; CONTINENTAL-MARGIN SEDIMENTS ; GAS HYDRATE ; AUTHIGENIC CARBONATES ; POREWATER GEOCHEMISTRY ; SULFATE REDUCTION ; TRANSITION-ZONE ; ORGANIC-MATTER ; FLUID SOURCES ; FLUXES
资助项目National key R&D Program of China[2016YFA0601100] ; National Natural Science Foundation of China[41676061] ; National Natural Science Foundation of China[41976057]
WOS研究方向Geology
语种英语
WOS记录号WOS:000568796600008
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National key R&D Program of China ; National Natural Science Foundation of China
源URL[http://ir.idsse.ac.cn/handle/183446/7948]  
专题专家咨询委员会
通讯作者Wu, Zijun
作者单位1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
2.Guangzhou Marine Geol Survey, China Gas Hydrate Engn & Technol Ctr, Guangzhou 510075, Peoples R China
3.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Weining,Wu, Zijun,Wu, Sinan,et al. Pore-water dissolved inorganic carbon sources and cycling in the shallow sediments of the Haima cold seeps, South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2020,201:12.
APA Liu, Weining.,Wu, Zijun.,Wu, Sinan.,Wei, Jiangong.,Peng, Xiaotong.,...&Wang, Yiqing.(2020).Pore-water dissolved inorganic carbon sources and cycling in the shallow sediments of the Haima cold seeps, South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,201,12.
MLA Liu, Weining,et al."Pore-water dissolved inorganic carbon sources and cycling in the shallow sediments of the Haima cold seeps, South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 201(2020):12.

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来源：深海科学与工程研究所

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