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    Volume 48 Issue 10
    Oct.  2023
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    Lu Lu, Qian Cheng, Zhao Zhen, 2023. Petrogenesis of Hekanzi Alkaline Complex in Lingyuan, West Liaoning. Earth Science, 48(10): 3671-3688. doi: 10.3799/dqkx.2021.168
    Citation: Lu Lu, Qian Cheng, Zhao Zhen, 2023. Petrogenesis of Hekanzi Alkaline Complex in Lingyuan, West Liaoning. Earth Science, 48(10): 3671-3688. doi: 10.3799/dqkx.2021.168

    Petrogenesis of Hekanzi Alkaline Complex in Lingyuan, West Liaoning

    doi: 10.3799/dqkx.2021.168
    • Received Date: 2021-07-16
      Available Online: 2023-10-31
    • Publish Date: 2023-10-25
    • The Hekanzi alkaline complex in Lingyuan, West Liaoning, is one important Early Mesozoic alkaline complex on the northern margin of the North China craton. In this paper, the Hekanzi alkaline complex was studied in detail by zircon U-Pb geochronology, major and trace elemental compositions and Sr-Nd-Hf isotopic compositions. The zircons from the granite porphyry and pyroxene syenite yielded U-Pb data of 227.7±1.5 Ma and 225.8±1.2 Ma, respectively. These results show that the rocks formed in the Late Triassic. Geochemical results show that the granite porphyries belong to perauminous rocks and shoshonite series. The pyroxene syenites belong to metaluminous rocks and high K shoshonite series. They both have similar right-leaning chondrite-normalized distribution curves and show obviously positive Eu anomalies. The Sr-Nd isotopic results show that εNd(t) values of the granite porphyries vary from -6.9 to -5.5, and εNd(t) values of the pyroxene syenites vary from -5.4 to -4.7. The zircon εHf(t) values of the granite porphyries range from -4.32 to -1.65. The zircon εHf(t) values of the pyroxene syenites are negative (εHf(t)=-1.01 to -0.01). These geochemical signatures, along with Sr-Nd-Hf isotopic compositions, reveal that the alkaline complex was derived from the partial melting of enriched lithospheric mantle which contained phlogopite, horblende and garnet. Combined with the previous research, it is suggested that the formation of the Hekanzi alkaline complex from Lingyuan, West Liaoning, is related to the closure of paleo-Asian Ocean, and the Early Mesozoic alkali-rich magmatism is the result of as the nospheric upwelling, following the thinning of mantle lithosphere.

       

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