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    Volume 46 Issue 5
    May  2021
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    Article Navigation >  Earth Science  > 2021  >  46(5): 1597-1612
    Yang Xin, Tang Juxing, Yang Zongyao, Xie Fuwei, Hao Jinyue, Wu Xin, Song Zhuangzhuang, 2021. Late Cretaceous Adakite in Sinongduo Area, Tibet: Implications for Petrogenesis and Mineralization. Earth Science, 46(5): 1597-1612. doi: 10.3799/dqkx.2020.157
    Citation: Yang Xin, Tang Juxing, Yang Zongyao, Xie Fuwei, Hao Jinyue, Wu Xin, Song Zhuangzhuang, 2021. Late Cretaceous Adakite in Sinongduo Area, Tibet: Implications for Petrogenesis and Mineralization. Earth Science, 46(5): 1597-1612. doi: 10.3799/dqkx.2020.157
    shu

    Late Cretaceous Adakite in Sinongduo Area, Tibet: Implications for Petrogenesis and Mineralization

    doi: 10.3799/dqkx.2020.157
    • 1.

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

    • 2.

      MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Science, Beijing 100037, China

    • 3.

      Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China

    • 4.

      College of Earth Science, Chengdu University of Technology, Chengdu 610059, China

    • Received Date: 2020-09-02
    • Publish Date: 2021-05-15
      Abstract
    • The genesis of the Late Cretaceous adakite in the Gangdese belt, Tibet, has been debated for decades, and research on the productivity of these intrusions is limited. To provide a further understanding of this issue, it presents zircon U-Pb data, geochemical and zircon trace element data of the biotite monzogranite from Sinongduo-Jiaduobu area, Xietongmen County, Tibet. New age data indicate that the biotite monzogranite emplaced in the Late Cretaceous (83.1±1.6 Ma). These rocks are characterized by relatively high contents of SiO2 (60.21%-62.54%), MgO (2.19%-3.02%), Mg# (41.25-50.73), low contents of Y (15.9×10-6-17.8×10-6), Yb (1.46×10-6-1.73×10-6) and high Sr/Y (35.0-47.6), La/Yb (29.6-38.6) ratios, showing high-SiO2 adakitic rock affinity. These rocks belong to high-K calc-alkaline and metaluminous series (A/CNK=0.84-0.92), and enriched in LREE, LILE (large ion lithophile element) and depleted in HREE, HFSE (high field strength element), such as Nb and Ta. The zircon trace element data show high V/Sc, Ce/Ce*, 10 000×(Eu/Eu*), and moderate Eu/Eu* ratios. By comparing with typical adakitic rocks from the Gangdese belt, it is proposed that these rocks with high oxygen fugacity were derived from the partial melting of subducted Neo-Tethyan slab, and have good potential for Cu-Au mineralization.

       

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