期刊
JOURNAL OF RARE EARTHS
卷 29, 期 7, 页码 702-709出版社
ELSEVIER
DOI: 10.1016/S1002-0721(10)60526-1
关键词
last deglaciation; inner shelf of the East China Sea; grain size; sediment provenance; rare earth elements
资金
- National Natural Science Foundation of China [40776030]
- Natural Science Foundation of Shandong Province [ZR2010DL009]
- Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences [MGE2010KG02]
- Fundamental Research Funds for the Central Universities [10CX04004A]
- China University of Petroleum [Y0901036]
Gravity core EC2005, located in the mud wedge off the Zhejiang-Fujian coast in the inner shelf of the East China Sea (ECS), was analyzed for its lithology, grain size, rare earth elements (REE) and AMS(14)C dating. Results revealed high-resolution paleoenvironmental evolution and multiple switches of sediment provenances in the inner shelf of ECS. The lithology, grain size and REE concentrations of sediments varied significantly down the core. Mean grain size ranged from 8 to 121 mu m, and the values of Sigma REE were 152.8-227.9 mu g/g. The chondrite- and shale-normalized REE patterns indicated their similarity to the terrigenous sediments in the study area. Between 17.3-12.3 ka BP the sediments in the inner shelf of ECS were mainly originated from local drainage basins. The source then gradually switched to the Yangtze River between 12.3 and 9.8 ka BP. Since about 10-9.8 ka BP, the sediments in the study area were dominantly derived from the Yangtze River. The continuous rising of sea level and formation of coastal current along the inner shelf played a key role in the switches of sediment provenances.
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