Changing provenance of late Cenozoic sediments in the Jianghan Basin  

作　　者：Lei Shao Shengyuan Yuan Chang'an Li Chunguo Kang Wenjing Zhu Yindi Liu Jietao Wang 

机构地区：[1]Wuhan Center of Geological Survey, China Geological Survey [2]Faculty of Earth Sciences, China University of Geosciences [3]College of Urban Planning & Environment Science, Xuchang University [4]State Key Laboratory of Biogeology and Environmental Geology [5]Institute of Geophysics & Geomatics, China University of Geosciences [6]Hubei Institute of Geological Sciences

出　　处：《Geoscience Frontiers》2015年第4期605-615,共11页地学前缘（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grants Nos.40971008 and 40771213);the Open Research Program of State Key Laboratory of Loess and Quaternary Geology(Grant No.SKLLQG0908)

摘　　要：The Yangtze River is one of the most important components of the East Asia river system. In this study, sediments in the Jianghan Basin, middle Yangtze River, were selected for trace element and rare earth element （REE） measurements, in order to decipher information on the change of sediment provenance and evolution of the Yangtze River. According to the elemental variations, the late Cenozoic sediments of the Jianghan Basin could be divided into four parts. During 2.68-2,28 Ma and 1.25-0 Ma, proveJ nance of the sediments was consistent, whereas sediments were derived from variable sources during 2.28-1.25 Ma. Comparison of the elemental compositions between the Pliocene and Quaternary sediments revealed a change in sediment source from a more felsic source area to a more basic source area around the Pliocene--Quaternary boundary. Input from the Emeishan LIP should account for this provenance change, Based on the provenance analysis of sediments in the Jianghan Basin, we infer that the Yangtze River developed into a large river with its drainage basin extended to the Emeishan LIP no later than the Pliocene-Quaternary boundary.The Yangtze River is one of the most important components of the East Asia river system. In this study, sediments in the Jianghan Basin, middle Yangtze River, were selected for trace element and rare earth element （REE） measurements, in order to decipher information on the change of sediment provenance and evolution of the Yangtze River. According to the elemental variations, the late Cenozoic sediments of the Jianghan Basin could be divided into four parts. During 2.68-2,28 Ma and 1.25-0 Ma, proveJ nance of the sediments was consistent, whereas sediments were derived from variable sources during 2.28-1.25 Ma. Comparison of the elemental compositions between the Pliocene and Quaternary sediments revealed a change in sediment source from a more felsic source area to a more basic source area around the Pliocene--Quaternary boundary. Input from the Emeishan LIP should account for this provenance change, Based on the provenance analysis of sediments in the Jianghan Basin, we infer that the Yangtze River developed into a large river with its drainage basin extended to the Emeishan LIP no later than the Pliocene-Quaternary boundary.

关 键 词：Yangtze River Jianghan Basin Trace element REE Provenance 

分 类 号：P534.6[天文地球—古生物学与地层学]