Volume 43 Issue 8
Aug.  2018
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Zou Jieqiong, Yu Hongxia, Wang Baodi, Huang Feng, Zeng Yunchuan, Huang Wenlong, Wen Yaqian, Zhang Zhao, Fan Zichen, Tan Rongyu, 2018. Petrogenesis and Geological Implications of Early Jurassic Granodiorites in Renqinze Area, Central Part of Southern Lhasa Subterrane. Earth Science, 43(8): 2795-2810. doi: 10.3799/dqkx.2018.589
Citation: Zou Jieqiong, Yu Hongxia, Wang Baodi, Huang Feng, Zeng Yunchuan, Huang Wenlong, Wen Yaqian, Zhang Zhao, Fan Zichen, Tan Rongyu, 2018. Petrogenesis and Geological Implications of Early Jurassic Granodiorites in Renqinze Area, Central Part of Southern Lhasa Subterrane. Earth Science, 43(8): 2795-2810. doi: 10.3799/dqkx.2018.589
shu

Petrogenesis and Geological Implications of Early Jurassic Granodiorites in Renqinze Area, Central Part of Southern Lhasa Subterrane

doi: 10.3799/dqkx.2018.589
  • 1.

    State Key Laboratory of Isotope Geochemistry of Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049, China

  • 3.

    School of Earth Science, Guilin University of Technology, Guilin 541004, China

  • 4.

    Chengdu Center of China Geological Survey, Chengdu 610081, China

  • 5.

    School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China

  • Received Date: 2018-04-09
  • Publish Date: 2018-08-15
    Abstract
  • The opening and subduction time of the Neo-Tethys ocean in the southern part of the Lhasa block on the Qinghai-Tibet Plateau ramains controversial.The widely developed Mesozoic granitoids in the southern Lhasa subterrane of Tibetan Plateau, are essential samples to explore the prolonged evolution of subduction process of the Neo-Tethys before collision between the Asia and India continents.Here, we present detailed zircon U-Pb dating, trace element and Hf isotope, whole-rock major and trace elements, and Sr-Nd isotope data for the granodiorites from the Renqinze area, central part of southern Lhasa subterrane.The granodiorites were crystallized at ca.180 Ma, which belongs to Early Jurassic.They are characterized by relatively high SiO2 (62.77%-64.18%) contents and low K2O/Na2O (0.29-0.60) and A/CNK values (0.90-0.98).These geochemical characteristics are similar to Ⅰ-type calc-alkaline rocks.Renqinze granodiorites are enriched in LILEs (e.g. Ba and U) and depleted in HFSEs (e.g. Nb and Ta), showing the geochemical affinity of arc-related magmatism.The granodiorites fall into the range of partial melts of meta-basaltic rocks due to their high CaO, low total alkaline and Al2O3 contents.The accordant results of Ti-in-zircon and whole-rock zircon saturation temperature suggest that the Renqinze granitoid rocks were derived from the lower continental crust.Moreover, the granodiorites show low (87Sr/86Sr)i(0.703 671-0.703 794), high εNd(t)(5.41-5.66) and zircon εHf(t)(12.6-14.8) values, indicating they were likely generated from partial melting of a juvenile mafic lower crust.The Renqinze granitodiorites represent the products of subduction of the Neo-Tethys ocean.The timing for the opening of the Neo-Tethys is at least before Late Triassic.

     

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