Rare earth elements in cold seep carbonates from the southwestern Dongsha area, northern South China Sea

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	Rare earth elements in cold seep carbonates from the southwestern Dongsha area, northern South China Sea
	Wang, SH ; Yan, W ; Chen, Z ; Zhang, N ; Chen, H
刊名	MARINE AND PETROLEUM GEOLOGY
	2014
卷号	57 页码:482-493
关键词	Rare earth element (REE) Cold seep carbonate Redox condition Northern South China sea
ISSN号	0264-8172
通讯作者	wyan@scsio.ac.cn
中文摘要	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.
学科主题	Geology
收录类别	SCI
资助信息	Knowledge Innovation Program of the Chinese Academy of Sciences [KZCX2-YW-GJ03-01]; National Natural Science Foundation of China [41276050, 41176052]
原文出处	ELSEVIER SCI LTD
WOS记录号	WOS:000342530100031
公开日期	2014-12-11
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/10598]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	Wang, SH,Yan, W,Chen, Z,et al. Rare earth elements in cold seep carbonates from the southwestern Dongsha area, northern South China Sea[J]. MARINE AND PETROLEUM GEOLOGY,2014,57:482-493.
APA	Wang, SH,Yan, W,Chen, Z,Zhang, N,&Chen, H.(2014).Rare earth elements in cold seep carbonates from the southwestern Dongsha area, northern South China Sea.MARINE AND PETROLEUM GEOLOGY,57,482-493.
MLA	Wang, SH,et al."Rare earth elements in cold seep carbonates from the southwestern Dongsha area, northern South China Sea".MARINE AND PETROLEUM GEOLOGY 57(2014):482-493.