Rare earth element geochemistry in the inner shelf of the East China Sea and its implication to sediment provenances  

作　　者：徐方建 李安春 李铁刚 胥可辉 陈世悦 邱隆伟 操应长 

机构地区：[1]Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences [2]School of Geosciences, China University of Petroleum [3]Key Laboratory of Shandong Province for Reservoir Geology, China University of Petroleum [4]Department of Marine Science, Coastal Carolina University

出　　处：《Journal of Rare Earths》2011年第7期702-709,共8页稀土学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (40776030);Natural Science Foundation of Shandong Province (ZR2010DL009);Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences (MGE2010KG02);Fundamental Research Funds for the Central Universities (10CX04004A);the Doctoral Fund of China University of Petroleum (Y0901036)

摘　　要：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 AMS14C 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 μm, and the values of ΣREE were 152.8-227.9 μg/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.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 AMS14C 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 μm, and the values of ΣREE were 152.8-227.9 μg/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.

关 键 词：last deglaciation inner shelf of the East China Sea grain size sediment provenance rare earth elements 

分 类 号：P736.41[天文地球—海洋地质]