Detrital zircon U-Pb ages of Late Cenozoic sediments from the Yangtze delta:Implication for the evolution of the Yangtze River

作     者：JIA JunTao ZHENG HongBo HUANG XiangTong WU FuYuan YANG ShouYe 

作者机构：State Key Laboratory of Marine Geology Tongji University Shanghai 200092 China School of Earth Science and Engineering Nanjing University Nanjing 210093 China State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China 

出 版 物：《Chinese Science Bulletin》 (Chinese Science Bulletin)

年 卷 期：2010年第55卷第15期

页      面：1520-1528页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 40830107) IGCP-581 Project 

主　　题：长江三角洲 活动年龄 碎屑锆石 晚新生代 沉积物 演化 Pb 峨眉山大火成岩省 

摘      要：Detrital zircon grains of Late Cenozoic sediments dated back to ca.3.6 Ma from core DY03 in the Yangtze delta were dated by LA-ICP-MS,in order to investigate the sedimentary provenance and to find some clue for the evolution of the Yangtze *** of the detrital zircon U-Pb ages are distributed at 100 300 Ma,350 550 Ma,600 1000 Ma,1400 2000 Ma and 2200 2800 Ma,which correspond well with the main tectonic and magmatic events in the Yangtze *** detrital zircon age patterns show distinct difference between the 3 samples below 189.8 m and other 6 above 189.8 m.43% 55% zircons in the 3 samples below 189.8 m fall within Cretaceous,while ages from 150 to 2800 Ma are distributed with no obvious peaks,which indicate the sedimentary provenance may be limited to the lower Yangtze *** 6 samples above 189.8 m show similar age patterns,and the ages are relatively evenly distributed,indicating the sedimentary provenance broadened *** 6 samples deposited later than ca.3.2 Ma show age information from the upper Yangtze drainage (including the Emeishan large igneous province),indicating that the Three Gorges may have already been cut through by then.