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The Significances of and Advances in the Study of Sediment Sources in the South China Sea

CAI Guan-qiang1,PENG Xue-chao1,ZHANG Yu-lan2(1.Guangzhou Marine Geological Survey,Guangzhou 510760,China;2.State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China)  
The South China Sea(SCS) is a typical marginal sea,in which the sediments recorded important information about paleooceanography,East Asian monsoon and regional tectonic evolution.The study on sediment sources in the SCS can not only offer a further understanding of sedimentary processes in the marginal sea,but also provide with theoretical evidences for reconstructing the paleooceanography in the SCS and further studying the evolution of East Asian monsoon.The sources of the sediments in the SCS are complicated and controlled by many factors.The sediments in the northern SCS are mainly derived from the northern landmass,where the rivers entering the sea include the Pearl River,the Red River and the rivers in Taiwan Island.The Changjiang River and the Luzon Island Arc located on the east may also supply important material to the northeastern and eastern parts of the SCS.In the southern SCS the sediments are mainly derived from the Indo-China landmass in the west and the Malaya Peninsula and the Kalimantan Island in the south.In the deep basins located in the east and center of the SCS the contents of authigenic minerals and volcanic detritus are found to increase distinctly in the sediments.It has been revealed that the circulations and climatic conditions in the SCS play an important role in controlling the transportation and diffusion of land-sourced materials in the SCS.The tectonic activities and sea-level changes also exerted important influence to the evolution of the sediment sources in the SCS.However,in order to estimate effectively the contributions of different material sources to the SCS and to simulate the transportation and accumulation occuring after all end-member detritus entering into the SCS,it is necessary to extract and recognize the source indicators that hided in the mojor size fractions of the sediments and then to make a comprehensive analysis of sediment sources.
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