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YIN Jiyuan, CHEN Wen, XIAO Wenjiao, ZHANG Bin, CAI Keda, SUN Jingbo, ZHANG Yan, YANG Jing, YANG Li, LIU Xinyu, SHEN Ze. 2015: LA-ICP-MS zircon U-Pb age and geochemistry of the dark dykes in Central Tianshan Block. Geological Bulletin of China, 34(8): 1470-1481. DOI: 10.12097/gbc.20150807
Citation: YIN Jiyuan, CHEN Wen, XIAO Wenjiao, ZHANG Bin, CAI Keda, SUN Jingbo, ZHANG Yan, YANG Jing, YANG Li, LIU Xinyu, SHEN Ze. 2015: LA-ICP-MS zircon U-Pb age and geochemistry of the dark dykes in Central Tianshan Block. Geological Bulletin of China, 34(8): 1470-1481. DOI: 10.12097/gbc.20150807
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LA-ICP-MS zircon U-Pb age and geochemistry of the dark dykes in Central Tianshan Block

  • Laboratory of Isotope Thermochronology, State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;3. Xinjiang Research Center for Mineral Resources, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China

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  • The NNW-trending dark dykes widely occur in Central Tianshan Mountains. The LA-ICP-MS zircon U-Pb dating of dark dyke yielded a weighted mean 206Pb/238U age of 304.8±1.5Ma, suggesting that they were generated in Late Carboniferous. The dark dykes are characterized by low Mg, Cr and Ni values. These samples are enriched in LILEs (e.g., Rb，Ba，Th) and depleted in HFSEs (e.g., Nb, Ta, Ti). The dark dykes were likely generated by interaction of mantle wedge with fluids derived from dehydration of the subducting slab. The closure of the Junggar Ocean probably terminated after Late Carboniferous.
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