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    中国百强科技报刊

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    Volume 45 Issue 8
    Aug.  2020
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    Cui Xiaozhuang, Ren Guangming, Sun Zhiming, Wang Peng, Liu Shilei, Deng Qi, Ren Fei, Pang Weihua, 2020. Multiple Tectonothermal Events Recorded in the Early Precambrian Cuoke Complex in the Southwestern Yangtze Block, South China. Earth Science, 45(8): 3054-3069. doi: 10.3799/dqkx.2020.199
    Citation: Cui Xiaozhuang, Ren Guangming, Sun Zhiming, Wang Peng, Liu Shilei, Deng Qi, Ren Fei, Pang Weihua, 2020. Multiple Tectonothermal Events Recorded in the Early Precambrian Cuoke Complex in the Southwestern Yangtze Block, South China. Earth Science, 45(8): 3054-3069. doi: 10.3799/dqkx.2020.199

    Multiple Tectonothermal Events Recorded in the Early Precambrian Cuoke Complex in the Southwestern Yangtze Block, South China

    doi: 10.3799/dqkx.2020.199
    • Received Date: 2020-06-09
    • Publish Date: 2020-08-15
    • The Cuoke Complex, a newly identified Early Precambrian basement complex in central Yunnan, bears key information for the early evolution of the Yangtze Block. Here, we present zircon U-Pb geochronological and Hf isotopic data of four representative samples collected from this complex. Magmatic zircons of one trondjemitic gneiss sample yield a crystallization age of 2 845±33 Ma, with positive εHf(t) values of 1.7-4.6 and relatively young depleted mantle two stage (TDM2) model ages of 2.97-3.12 Ga, suggestive of the derivation from remelting of juvenile crust. Meta-monzogranite and gneissic granite yield ages of 2 401±15 Ma and 2 320±16 Ma respectively. They show negative zircon εHf(t) values of -6.2 to -0.8 and older TDM2 model ages of 2.90-3.11 Ga, indicating that they were formed by remelting of ancient crustal materials. Metamorphic-origin zircons of one plagioclase-biotite cataclasite sample give an age of 1 948±16 Ma. Together with available metamorphic age data, it is revealed that one episode of regional metamorphism occurred at 1.96-1.95 Ga. Our new dataset confirms the existence of Archean basement rocks in the Cuoke Complex. Moreover, multiple magmatic and metamorphic events related to the assembly of the Nuna supercontinent extensively took place in the southwestern Yangtze Block, South China.

       

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