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《Geochimica》 2004-03
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Distribution and its dissolution of carbonate in seafloor surface sediment in the western South China Sea

LI Xue jie1,2, CHEN Fang3, LIU Jian3, HUANG Xue hua3 (1. Institute of Development for Marine Geoscience, Guangzhou Marine Geological Survey, Guangzhou 510760, China; 2. Laboratory of Marine Geology, Tongji University, Shanghai 200092, China; 3. Marine Geological Analysis Center, Guangzhou Marine Geological Survey, Guangzhou 510760, China)  
As an important composition of marine sediment, carbonate makes up more than 70% in sea floor sediment in the South China Sea. It would be muchvaluable to research for the distribution of carbonate in recent marine. Base on large numbers of sampling at sea floor in the western South China Sea, the contents of carbonate are highest in the upper continental slope in total, especially higher in northern and mid southern, but lower in middle part and southeastern. It is suggested that the contents of carbonate in the shelf and the slopeare controlled by the terrigenous material supply and are close relationship with the extent of shelf and the gradient of slope. They are lower in the steeper upper slope outside the narrow continental shelf, with abundant supply of terrigenous material, while they are higher in the flatter upper slope outside the wide continental shelf, with less supply of terrigenous material. The contents of carbonate are highest in the area of water depth between 400 m to 600 m. The average content in the area with water depth of 500 m to 600 m is as high as 44.37%. The dissolution of carbonate intensified after water depth of 1 300 m, as thecontents decreased distinctly. It is suggested by polynomial fits between the contents and water depths that no distinguished carbonate lysocline depth (CLD) in the western South China in which the dissolution increased abruptly. But it issuggested that 3 500 m should be a CCrD of the sea area, but not CCD, for an inflexion appears at 3 500 m in which the contents of carbonate are about 8% in average and changed from decreasing to steadily as the water depth increasing.
【Fund】: 国家重点基础研究发展规划资助项目(G2000078501)
【CateGory Index】: P594
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