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SHRIMP zircon U-Pb dating from K-bentonite in the top of Ordovician of Wangjiawan Section,Yichang,Hubei,China[J]. HU YanHua1,4, ZHOU JiBin1, SONG Biao2, LI Wei1 & SUN WeiDong1,3 1 Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sci-ences, Guangzhou 510640, China;2 Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;3 School of Earth and Space Science, University of Science and