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    Volume 49 Issue 8
    Aug.  2024
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    Zhang Weifeng, Deng Xin, Zhang Liguo, Wang Jing, Xie Guogang, Jin Xinbiao, 2024. Early Permian Post-Collisional Extension and Crust-Mantle Magmatism in the Central Tianshan Block, Eastern Tianshan: Constraints from the Study of Porphyritic Monzodiorite. Earth Science, 49(8): 2697-2713. doi: 10.3799/dqkx.2023.064
    Citation: Zhang Weifeng, Deng Xin, Zhang Liguo, Wang Jing, Xie Guogang, Jin Xinbiao, 2024. Early Permian Post-Collisional Extension and Crust-Mantle Magmatism in the Central Tianshan Block, Eastern Tianshan: Constraints from the Study of Porphyritic Monzodiorite. Earth Science, 49(8): 2697-2713. doi: 10.3799/dqkx.2023.064

    Early Permian Post-Collisional Extension and Crust-Mantle Magmatism in the Central Tianshan Block, Eastern Tianshan: Constraints from the Study of Porphyritic Monzodiorite

    doi: 10.3799/dqkx.2023.064
    • Received Date: 2023-01-08
      Available Online: 2024-08-27
    • Publish Date: 2024-08-25
    • As a typical case of the Permian magmatism in the Eastern Tianshan, the porphyritic monzodiorite exposed in the southern margin of the Central Tianshan block. Zircon U-Pb dating on the monzodiorite yields an age of 281.3±1.5 Ma. The monzodiorite shows high-K calc-alkaline and metaluminous affinities, with Na2O+K2O and A/CNK values ranging 5.88‒6.62 wt.% and 0.66‒0.73, respectively. They are characterized by high Fe2O3/FeO ratios (0.66~0.73), and present the assemblage of titanite+quartz+magnetite in the groundmass, suggesting that the monzodiorite formed under a high oxygen fugacity condition. The monzodiorite enriched in LILEs (i.e. Rb, K and Ba), but depleted in HFSEs (i.e. Nb, Ta and Ti) and HREE. In addition, all the study samples have negative εNd(t) (-2.72 to -3.07), high initial 87Sr/86Sr (0.706 46 to 0.706 54) values, and negative zircon εHf(t) (-3.7 to -0.8) values, as well as intermediate Nb/U (10.3 to 10.9) values. These geochemical features indicating that the magmas originated from spinel-garnet lherzolite that metasomatized by subduction-related fluids, and mixed with minor crustal components. Integrating the petrogenesis and other geological evidences, we proposed that the magmatisms in the Central Tianshan block were generated in post-collision extensional setting of slab breakoff during the Early Permian.

       

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