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    Volume 44 Issue 7
    Jul.  2019
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    Article Navigation >  Earth Science  > 2019  >  44(7): 2490-2504
    Wang Meng, Pei Xianzhi, Liu Chengjun, Zhang Yongming, Li Zuochen, Li Ruibao, Pei Lei, Chen Youxin, Chen Guochao, 2019. Magma Mixing of the Heimahe Pluton in the Qinghai Nanshan Tectonic Zone: Evidence from Petrology, Geochemistry and Geochronology, and Its Tectonic Implications. Earth Science, 44(7): 2490-2504. doi: 10.3799/dqkx.2018.531
    Citation: Wang Meng, Pei Xianzhi, Liu Chengjun, Zhang Yongming, Li Zuochen, Li Ruibao, Pei Lei, Chen Youxin, Chen Guochao, 2019. Magma Mixing of the Heimahe Pluton in the Qinghai Nanshan Tectonic Zone: Evidence from Petrology, Geochemistry and Geochronology, and Its Tectonic Implications. Earth Science, 44(7): 2490-2504. doi: 10.3799/dqkx.2018.531
    shu

    Magma Mixing of the Heimahe Pluton in the Qinghai Nanshan Tectonic Zone: Evidence from Petrology, Geochemistry and Geochronology, and Its Tectonic Implications

    doi: 10.3799/dqkx.2018.531
    • 1.

      Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education; Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MNR; School of Earth Science and Resources, Chang'an University, Xi'an 710054, China

    • 2.

      Faculty of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255049, China

    • 3.

      School of Civil Engineering, Nanyang Institutte of Technology, Nanyang 473000, China

    • Received Date: 2018-02-05
    • Publish Date: 2019-07-15
      Abstract
    • The Heimahe pluton is located in the Qinghai Nanshan tectonic belt, northern margin of the West Qinling orogeny. Mafic microgranular enclaves (MMEs) are widely distributed in the Heimahe pluton. However, the petrogenesis of the MMEs is an issue of debate. We present the petrology, mineral chemistry, rock geochemistry and geochronology of the granodiorite and MMEs from the pluton in this paper. The outcrop conditions, shapes, structural and mineral characters of the MMEs reflect that they were products of rapid crystallization when mafic magma injected into the intermediate-acid magma. In the binary diagram of major elements, the granodiorites and MMEs show a mixing trend between mantle- and crust-derived magmas. Besides, their total REE contents and similar REE patterns and Eu anomalies also support the magma mixing model. LA-ICPMS zircon U-Pb dating results show that the granodiorite formed at 246 Ma, and the MMEs formed at 245 Ma. The same crystallization age suggests that the MMEs were not restites or host-rock xenoliths. Combined with regional geology, we suggest that the Heimahe pluton formed by the southward subduction of the limited oceanic basin in the northern margin of the West Qinling, and the Qinghai Nanshan tectonic belt experienced the same evolutionary process with the Tianjun Nanshan belt.

       

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