| 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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| 作者姓名： | XIA Bin LI Jianfeng XU Lifeng WANG Ran YANG Zhiqing |
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| 作者单位： | 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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| 基金项目： | supported by the National Natural Science Foundation of China(Grant 40534019); the Major Direction Program of Innovation Engineering of CAS(Grant KZCX2-SW-117-5) |
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| 摘 要： | 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 Na_2O+K_2O,rare earth element patterns,trace elemental spider diag...
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| 关 键 词： | 山国 上口 白象 |
| 收稿时间： | 1/1/2011 12:00:00 AM |
| 修稿时间： | 2011/3/30 0:00:00 |
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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| Authors: | XIA Bin LI Jianfeng XU Lifeng WANG Ran and YANG Zhiqing |
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| Institution: | XIA Bin~1,LI Jianfeng~(2,*),XU Lifeng~3,WANG Ran~4 and YANG Zhiqing~5 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,... |
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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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| Keywords: | ophiolite tectonic evolution U-Pb dating Yarlung Tsangpo |
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