The rare earth element geochemistry of surface sediments in four transects in the South China Sea and its geological significance
Liu, Fangwen1; Miao, Li1; Cai, Guanqiang1; Yan, Wen1; miaoli@scsio.ac.cn
2015
发表期刊ENVIRONMENTAL EARTH SCIENCES
卷号74期号:3页码:2511-2522
摘要Seventy-five samples of surface sediment were collected from four transects in the South China Sea (SCS) for analyses of rare earth element (REE) geochemistry. Total REE abundance (Sigma REE) in the SCS varies from 45 to 195 ppm (average 128 ppm), lower than that of the upper continental crust. The spatial distribution of REE is strongly dependent upon the geographical location and depositional environment. Low Sigma REE concentrations are observed on the continental slope (e.g., Xisha and Nansha islands), while high Sigma REE concentrations are present in the deep basin. Sediments on the slope are also characterized by lower LREE/HREE, (La/Yb)(N), Eu/Eu*, and Ce/Ce* ratios relative to deep-basin sediments. There is a positive correlation between Al2O3 and Sigma REE, and a negative correlation between CaO and Sigma REE. Conversely, the relatively insignificant Fe-Mn oxide accumulation in the SCS suggests that manganese nodules do not make a significant contribution to the bulk REE composition of sediments. Therefore, the sediment REE geochemistry is mainly controlled by terrigenous and biogenic sources. Biogenic carbonate has a diluting effect on Sigma REE concentrations, but a significant influence on LREE/HREE, Ce/Ce*, and (La/Yb) N values is found only in sediments with especially high biogenic carbonate levels. The REE geochemistry of SCS surface sediments indicates that their source is mainly post-Archean felsic rocks. In the eastern sub-basin, the relatively low LREE/HREE ratios and high Eu/Eu* values of the sediments indicate that significant terrigenous materials are derived from young volcanic rocks (e.g., rocks in the Luzon arc).
部门归属LMB
关键词Rare Earth Elements Geochemistry South China Sea Sediment
学科领域Environmental Sciences & Ecology ; Geology ; Water Resources
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/14797
专题中科院海洋生物资源可持续利用重点实验室
通讯作者miaoli@scsio.ac.cn
作者单位1.[Liu, Fangwen
2.Miao, Li
3.Yan, Wen] South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
4.[Liu, Fangwen] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.[Cai, Guanqiang] Guangzhou Marine Geol Survey, MLR Key Lab Marine Mineral Resources, Guangzhou 510760, Guangdong, Peoples R China
6.[Liu, Fangwen] MEP, Nanjing Inst Environm Sci, Nanjing 210042, Jiangsu, Peoples R China
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Liu, Fangwen,Miao, Li,Cai, Guanqiang,et al. The rare earth element geochemistry of surface sediments in four transects in the South China Sea and its geological significance[J]. ENVIRONMENTAL EARTH SCIENCES,2015,74(3):2511-2522.
APA Liu, Fangwen,Miao, Li,Cai, Guanqiang,Yan, Wen,&miaoli@scsio.ac.cn.(2015).The rare earth element geochemistry of surface sediments in four transects in the South China Sea and its geological significance.ENVIRONMENTAL EARTH SCIENCES,74(3),2511-2522.
MLA Liu, Fangwen,et al."The rare earth element geochemistry of surface sediments in four transects in the South China Sea and its geological significance".ENVIRONMENTAL EARTH SCIENCES 74.3(2015):2511-2522.
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