Sedimentary features of the Yangtze River-derived along-shelf clinoform deposit in the East China Sea |
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| Institution: | 1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;2. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;3. Department of Geological Sciences, University of Florida, Gainesville, FL 32611, USA;4. Department of Earth and Environmental Sciences, Tulane University, New Orleans, LA 70115, USA;5. The Water Institute of the Gulf, Baton Rouge, LA 70825, USA;6. Department of Geological Sciences, University of Alabama, Tuscaloosa, AL 35406, USA;7. College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;8. Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China;9. Qingdao Institute of Marine Geology, Qingdao 266071, China;1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Qingdao 266100, China;2. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;3. Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China;4. Institute of Marine Organic Geochemistry, Ocean University of China, Qingdao 266100, China;5. Department of Geological Sciences, University of Florida, Gainesville, FL 32611-2120, USA;1. Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. University of the Chinese Academy of Sciences, Beijing 100049, China;1. State Key Laboratory for Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;2. State Research Centre for Island Exploitation and Management, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;3. Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, China;4. State Key Laboratory of Marine and Environmental Science, Xiamen University, Xiamen 361005, China;5. Qingdao Institute of Marine Geology, Qingdao 266071, China;6. Open Laboratory for Coast and Ocean Environmental Geology, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China |
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| Abstract: | A predominant sigmoidal clinoform deposit extends from the Yangtze River mouth southwards 800 km along the Chinese coast. This clinoform is thickest (～40 m) between the 20 and 30 m isobaths and progressively thins offshore, reaching water depths of 60 and 90 m and distances up to 100 km offshore. Clay mineral, heavy metal, geochemical and grain-size analyses indicate that the Yangtze River is the primary source for this longshore-transported clinoform deposit. 210Pb chronologies show the highest accumulation rates (>3 cm/yr) occur immediately adjacent to the Yangtze subaqueous delta (north of 30 °N), decreasing southward alongshore and eastward offshore. The interaction of strong tides, waves, the China Coastal Current, winter storms, and offshore upwelling appear to have played important roles in trapping most Yangtze-derived sediment on the inner shelf and transporting it to the south. |
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