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学科主题: Geology
题名: Rare earth elements in cold seep carbonates from the southwestern Dongsha area, northern South China Sea
作者: Wang, SH ; Yan, W ; Chen, Z ; Zhang, N ; Chen, H
通讯作者: wyan@scsio.ac.cn
关键词: Rare earth element (REE) ; Cold seep carbonate ; Redox condition ; Northern South China sea
刊名: MARINE AND PETROLEUM GEOLOGY
发表日期: 2014
卷: 57, 页:482-493
收录类别: sci
部门归属: [Wang, Shuhong ; Yan, Wen ; Chen, Zhong ; Zhang, Nan ; Chen, Han] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Wang, Shuhong ; Yan, Wen ; Chen, Zhong] Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Guangdong, Peoples R China ; [Zhang, Nan ; Chen, Han] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
项目归属: 海洋地质
资助者: Knowledge Innovation Program of the Chinese Academy of Sciences [KZCX2-YW-GJ03-01]; National Natural Science Foundation of China [41276050, 41176052]
摘要: The circulation of methane-rich fluids at cold seeps often leads to the precipitation of seep carbonates close to the seafloor along continental margins, which can be used as records of past fluid seepage. Rare earth element (REE) concentrations in seep carbonates have been used to trace fluid sources and provide information on associated biogeochemical processes at cold seeps. The REE concentrations of a series of carbonates collected from cold seeps in the southwestern Dongsha area of the northern South China Sea are analyzed in this study. The total REE contents (Sigma REE) of the seep carbonates analyzed show a wide variation from 17 ppm to 523 ppm with an average Sigma REE value of 54 ppm, which are higher than the carbonates from other cold seep areas. A positive correlation between Fe-Mn content and Sigma REE was observed. These results suggest that the seep carbonates of this study were primarily controlled by the methane-derived fluid from which they precipitated. The Fe-rich dolomite and siderite, which are the main components of the carbonates, are responsible for the enrichment of the REE. A slight positive Ce anomaly observed in the shale-normalized REE patterns of the studied seep carbonates suggests that they formed in anoxic conditions, and the correlations between Ce/Ce* and La-N/Sm-N, Ce/Ce* and Dy-N/Sm-N, Ce/Ce* and Sigma REE further reveal that the REE characteristics of most seep carbonate samples preserve the original redox conditions in which they precipitated and late diagenesis has had little effect on the REE. However, the REE characteristics of sub-samples DS2-2B, DS1-6A and DS1-7A are very different from those of the other sub-samples, indicating a greater impact of late diagenesis and post-oxidation favored REE enrichment. (C) 2014 Elsevier Ltd. All rights reserved.
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WOS记录号: WOS:000342530100031
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10598
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Wang, SH; Yan, W; Chen, Z; Zhang, N; Chen, H.Rare earth elements in cold seep carbonates from the southwestern Dongsha area, northern South China Sea,MARINE AND PETROLEUM GEOLOGY,2014,57():482-493
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