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    中国百强科技报刊

    湖北出版政府奖

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    Volume 44 Issue 7
    Jul.  2019
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    Article Contents
    Song Yuhang, Xie Chaoming, Fan Jianjun, Zeng Xiaowen, Hao Yujie, Li Xiaobo, 2019. Petrogenesis of Volcanic Rocks from the Yeba Formation in Jialulang Area, Tibet and Its Constraints on the Subduction of Neo-Tethyan Oceanic Slab. Earth Science, 44(7): 2319-2338. doi: 10.3799/dqkx.2019.147
    Citation: Song Yuhang, Xie Chaoming, Fan Jianjun, Zeng Xiaowen, Hao Yujie, Li Xiaobo, 2019. Petrogenesis of Volcanic Rocks from the Yeba Formation in Jialulang Area, Tibet and Its Constraints on the Subduction of Neo-Tethyan Oceanic Slab. Earth Science, 44(7): 2319-2338. doi: 10.3799/dqkx.2019.147

    Petrogenesis of Volcanic Rocks from the Yeba Formation in Jialulang Area, Tibet and Its Constraints on the Subduction of Neo-Tethyan Oceanic Slab

    doi: 10.3799/dqkx.2019.147
    • Received Date: 2019-04-13
    • Publish Date: 2019-07-15
    • The volcanic rocks of the Yeba Formation on the Gangdese magmatic arc, Tibet are of importance for limiting the initiation of the Neo-Tethyan oceanic slab subduction. This paper reports LA-ICP-MS zircon U-Pb ages and whole-rock geochemistry compositions of the tuffs from the Yeba Formation in Jialulang area. LA-ICP-MS U-Pb isotopic dating of the tuffs obtained 206Pb/238U age weighted average values are 207.8±1.6 Ma, 204.8±1.7 Ma and 209.3±3.4 Ma, based on this analysis above and the evidence of fossil organism as well, the tuffs of the Yeba Formation were formed in the Late Triassic. The tuffs exhibit LREE and LILE (Rb, K, Th, U, Pb) enrichment and HREE and HFSE (Nb, Ta, Ti, P) depletion, depletion of Sr as well, with negative Eu anomaly. Combining with geochemical characteristics, it has been suggested a mixing source from crust and depleted mantle for the intermediate-acid rocks from the Yeba Formation. Based on the previous studies, it is indicated that the volcanic rocks of the Yeba Formation were formed in the active continental margin arc setting with the subduction of the Neo-Tethyan oceanic slab, the initiation of the subduction occurred at Late Triassic. This study provides new constraints for the ages and dynamic settings of the Yeba Formation.

       

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