Sensitive High Resolution Ion Micro-Probe U-Pb Zircon Geochronology and Geochemistry of Mafic Rocks from the Pulan-Xiangquanhe Ophiolite, Tibet: Constraints on the Evolution of the Neo-tethys
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  • XIA Bin

    XIA Bin

    1 School of Marine Sciences, Sun Yat-Sen University, Guangzhou 510006, China;2 State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, the Chinese Academy of Science, Guangzhou 510640, China;3 Guang Dong Noferrous Metal Engineering Investigation Design Institute, Guangzhou 510080, China;4 China Nuclear Power Design Company. Ltd (Shenzhen), Shenzhen 518031, China;5 Beijing SHRIMP Center, Chinese Academy of Geological Sciences, Beijing 100037, China
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  • LI Jianfeng

    LI Jianfeng

    1 School of Marine Sciences, Sun Yat-Sen University, Guangzhou 510006, China;2 State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, the Chinese Academy of Science, Guangzhou 510640, China;3 Guang Dong Noferrous Metal Engineering Investigation Design Institute, Guangzhou 510080, China;4 China Nuclear Power Design Company. Ltd (Shenzhen), Shenzhen 518031, China;5 Beijing SHRIMP Center, Chinese Academy of Geological Sciences, Beijing 100037, China
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  • XU Lifeng

    XU Lifeng

    1 School of Marine Sciences, Sun Yat-Sen University, Guangzhou 510006, China;2 State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, the Chinese Academy of Science, Guangzhou 510640, China;3 Guang Dong Noferrous Metal Engineering Investigation Design Institute, Guangzhou 510080, China;4 China Nuclear Power Design Company. Ltd (Shenzhen), Shenzhen 518031, China;5 Beijing SHRIMP Center, Chinese Academy of Geological Sciences, Beijing 100037, China
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  • WANG Ran

    WANG Ran

    1 School of Marine Sciences, Sun Yat-Sen University, Guangzhou 510006, China;2 State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, the Chinese Academy of Science, Guangzhou 510640, China;3 Guang Dong Noferrous Metal Engineering Investigation Design Institute, Guangzhou 510080, China;4 China Nuclear Power Design Company. Ltd (Shenzhen), Shenzhen 518031, China;5 Beijing SHRIMP Center, Chinese Academy of Geological Sciences, Beijing 100037, China
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  • YANG Zhiqing

    YANG Zhiqing

    1 School of Marine Sciences, Sun Yat-Sen University, Guangzhou 510006, China;2 State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, the Chinese Academy of Science, Guangzhou 510640, China;3 Guang Dong Noferrous Metal Engineering Investigation Design Institute, Guangzhou 510080, China;4 China Nuclear Power Design Company. Ltd (Shenzhen), Shenzhen 518031, China;5 Beijing SHRIMP Center, Chinese Academy of Geological Sciences, Beijing 100037, China
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This project was supported by the National Natural Science Foundation of China (Grant 40534019) and the Major Direction Program of Innovation Engineering of CAS (Grant KZCX2-SW-117-5).

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    Abstract:

    The Pulan-Xiangquanhe ophiolite in the western Yarlung Tsangpo suture zone of Tibet is investigated for its geochemistry, geochronology, and tectonic implications in detail. Sensitive high resolution ion micro-probe zircon U-Pb dating reveals that diabases in the ophiolite from the three locations of Xugugab, Mapam Yum Co and La’nga Co are dated at 122.3±2.5 Ma, 118.8±1.8 Ma and 120.5±1.9 Ma, respectively. These early Cretaceous mafic rocks have Na2O+K2O, rare earth element patterns, trace elemental spider diagram and other geochemical fingerprints of typical mature back-arc basin affinity. Therefore, the Pulan-Xiangquanhe ophiolite formed under a mature back-arc basin environment, which was a product of this intra-oceanic subduction system. A suprasubduction system could have existed in the southern margin of Eurasia, which involved both intra-oceanic and continent-ward subductions. Extension dominated the southern margin of the Eurasian continent during the early Cretaceous.

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XIA Bin, LI Jianfeng, XU Lifeng, WANG Ran, YANG Zhiqing.2011. Sensitive High Resolution Ion Micro-Probe U-Pb Zircon Geochronology and Geochemistry of Mafic Rocks from the Pulan-Xiangquanhe Ophiolite, Tibet: Constraints on the Evolution of the Neo-tethys[J]. Acta Geologica Sinica(),85(4):840-853

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History
  • Received:January 01,2011
  • Revised:March 30,2011
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