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The molecular assemblace features of n-alkanes in modern sediments from the South China Sea and their significance

YANG Dan,YAO Long-kui,WANG Fang-guo,ZHANG Hong,YE Xin-rong(Second Institute of Oceanography,SOA,Laboratory of Marine Ecosystem and Biogeochemistry,SOA,Hangzhou 310012,China)  
The n-alkanes in sediments from the north of the South China Sea is in range of nC_(15)~nC_(33),two modes that the first with low carbon range for nC_(19)~nC_(22) and the second with high carbon range for nC_(27),odd carbon-number preference in the range above nC_(24) OEP being 2.13,nC_(23)~-/nC_(24)~+ being 1.53 in the average.The nalkanes in sediments from the south of the South China Sea is in range of nC_(15)~nC_(33),two modes that the first with low carbon range for nC_(19)~nC_(23) and the second with high carbon range for nC_(27) or nC_(29),OEP being 1.58,nC_(23)~-/nC_(24)~+ being 2.15 in the average.The research indicated that the quantity of the contribution of the terrigenous origin compared with oceanic biology is the key determined the composition index of the n-alkanes in the sediments from the South China Sea.In this paper,the molecular assemblace features of n-alkanes in sediments,which gone through modern sedimentary process,from the South China Sea are compared with the n-alkanes from the sea areas of Yellow Sea,Bohai Sea and Donghai Sea.The research show that the material source effect of the molecular assemblace features from the Bohai Sea to the South China Sea.Some organic substances in the coascal muds lose or are enriched more or less wing to the climatic change,showing the climatic effect of the molecular assemblace features.
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