Geochemical characteristics and geochemical significance of rare earth elements of surface sediments from four typical sections of South China Sea
LIU Fang-wen1,2, YAN Wen1, MIAO Li1
1. CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China;
2. Nanjing Institute of Environmental Sciences, MEP, Nanjing 210042, China
Abstract：Seventy-five samples of surface sediments from four representative transects in the South China Sea(SCS,18°N,10°N,6°N;113°E)were collected for the analysis of rare earth elements (REE) geochemistry.The results showed that the total REE content (∑REE) was relatively low (average 128ppm) in most sediments with high LREE/HREE ratios,low Ce/Ce*,and moderate Eu/Eu* values.The spatial distribution of REE was strongly dependent upon the geographical location and depositional environments.There is a positive correlation between Al2O3 and ∑REE,and a negative correlation between CaO and RREE.Terrigenous component and biological carbonates were the two main sources of sediment in the area.Lower Eu/Eu*,(Gd/Yb)N and the REE distribution pattern of mast samples indicated that post-Archean felsic rocks are the main source.The relatively low LREE/HREE ratios and high Eu/Eu* values of the sediments in the eastern sub-basin indicated that a few materials from young volcanic rocks (e.g.,rocks in the Luzon arc) was transferred to this area.
LIU Fang-wen,YAN Wen,MIAO Li. Geochemical characteristics and geochemical significance of rare earth elements of surface sediments from four typical sections of South China Sea[J]. Marine Environmental Science, 2017, 36(5): 726-734.
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