WANG Xinlu, AWANG Danzeng, ZHAI Jie, SUOLANG Dandun, NI Jinhai, DENG Jiabao, JIANG Mengran, YI Jiyao. Detrital zircon U-Pb age of the Duoni Formation sandstone in Dongcuo area, Tibet, and its geological significance[J]. Geological Bulletin of China, 2019, 38(5): 733-741.
    Citation: WANG Xinlu, AWANG Danzeng, ZHAI Jie, SUOLANG Dandun, NI Jinhai, DENG Jiabao, JIANG Mengran, YI Jiyao. Detrital zircon U-Pb age of the Duoni Formation sandstone in Dongcuo area, Tibet, and its geological significance[J]. Geological Bulletin of China, 2019, 38(5): 733-741.

    Detrital zircon U-Pb age of the Duoni Formation sandstone in Dongcuo area, Tibet, and its geological significance

    • In this paper, the authors conducted some researches on U-Pb geochronology of detrital zircon of the Duoni Formation in Dongcuo area, Tibet. The grain diameter of detrital zircon is 50~180μm. The Th/U ratio is high. The Th/U ratio of 51 zircon samples is greater than 0.4, with the typical value being 0.64. So the magmatic zircon is dominant. The distribution of U-Pb age of zircon is 3261Ma, 2739~2335Ma, 1880~1750Ma, 1006~657Ma, 577~510Ma, 456~409Ma and 252~202Ma. The oldest detrital zircon age is 3261Ma. The provenance of the sediments contained residues of the earth's crust in Archean.The U-Pb age of zircon corresponds to the tectonic event of Qiangtang. So the provenance of Lower Cretaceous Formation in Dongcuo area should be Qiangtang block.
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