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DETRITAL ZIRCON U-Pb AGES AND ITS PROVENANCE SIGNIFICANCE IN THE TZK3 CORE FROM THE YANGTZE RIVER DELTA

CHENG Yu;LI Xiangqian;ZHAO Zengyu;ZHANG Xiangyun;GUO Gang;The Institute of Geological Survey of Jiangsu Province;  
Based on the magnetic stratigraphy of TZK3 core, the lithology, structural structure and zircon age characteristics of sediments were studied to explore the material source of sediments and running through time limit of the Yangtze River. The paleomagnetic results show that 96.7 m, 263.3 m and 603.75 m are B/M boundary, M/G boundary and boundary in the Pliocene, respectively. The plot of U-Pb age spectra for concordant zircons shows that the U-Pb zircon ages of the TZK3 Core are divided into five groups: 100~300 Ma, 400~500 Ma, 700~850 Ma, 1800~2000 Ma, 2400~2600 Ma. The age spectrum of 3.7 Ma is relatively simple, mainly in the Cretaceous(100~150 Ma), and the materials are mainly from the volcanic basin in the middle and lower reaches of the Yangtze River. The zircon age spectrum becomes complex and there are relatively more main peaks since 3.04 Ma, indicating that the source area is wider and far-source components are involved. The appearance of zircons from the Emeishan basaltic age(251~260 Ma) in the zircon age of 3.04 Ma, indicating that the material in the upper reaches of the Yangtze River has reached the Yangtze River Delta region in this period. So the running through time limit of the Yangtze River is 3.04~3.7 Ma
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