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Stable Carbon and Oxygen Isotopes of Pedogenic Carbonates in Ustic Vertisols: Implications for Paleoenvironmental Change[J]. HUANG Cheng-Min1,2, WANG Cheng-Shan2 and TANG Ya1 1 Department of Environmental Science and Technology, Sichuan University, Chengdu 610065 (China). 2 Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059 (China).Pedosphere. 2005(04)