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    Volume 46 Issue 1
    Jan.  2021
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    Article Navigation >  Earth Science  > 2021  >  46(1): 59-72
    Zheng Yuwen, Chen Youliang, Peng Boyang, Hu Yang, Guo Rui, Deng Zhou, 2021. Geochemical Characteristics and Tectonic Significance of the Neoproterozoic Amphibolites from Datian Area, Panzhihua City. Earth Science, 46(1): 59-72. doi: 10.3799/dqkx.2019.279
    Citation: Zheng Yuwen, Chen Youliang, Peng Boyang, Hu Yang, Guo Rui, Deng Zhou, 2021. Geochemical Characteristics and Tectonic Significance of the Neoproterozoic Amphibolites from Datian Area, Panzhihua City. Earth Science, 46(1): 59-72. doi: 10.3799/dqkx.2019.279
    shu

    Geochemical Characteristics and Tectonic Significance of the Neoproterozoic Amphibolites from Datian Area, Panzhihua City

    doi: 10.3799/dqkx.2019.279
    • 1.

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

    • 2.

      Sichuan Key Laboratory of Applied Nuclear Techniques in Geosciences, Chengdu University of Technology, Chengdu 610059, China

    • 3.

      No. 290 Research Institute of Nuclear Industry, Shaoguan 512029, China

    • Received Date: 2019-11-14
    • Publish Date: 2021-01-15
      Abstract
    • The amphibolites are widespread in the Kangding complex in Miyi-Panzhihua area,south Sichuan. The petrological,geochemical,zircon U-Pb dating and Lu-Hf isotope characteristics from the amphibolites in the Datian area have been studied in this work. The results show that:(1) The SiO2 contents range from 47.88% to 50.05%,falling into the range of subalkaline-alkaline basalt in the discrimination diagrams of TAS and Zr/TiO2-Nb/Y; (2) The total REE contents (ΣREE) range from 121.59×10-6 to 230.43×10-6,which is characterized by LREE-rich pattern((La/Yb)N=2.73-7.52) and is similar to oceanic island basalt; (3) The primitive mantle-normalized trace elements spider diagram is similar to that of intra-plate basalt. (4) The ratios of Zr/Nb,Hf/Th indicate that they are similar to intraplate basalt,while have obvious differences with arc basalt; (5) Zircon LA-ICP-MS U-Pb dating demonstrates that the crystallization age of amphiboliteis is 816.0-833.6 Ma,which is contemporary to the large-scale Neoproterozoic mafic magmatism in the west margin of Yangtze block (860-750 Ma),the εHf(t) of zircons is -6.8~+3.8,indicating that the basalts were derived from enriched mantle and has been contaminated by crustal materials. Thus,the amphibolites may formed in the continental rift environment caused by the breakup of Rodinia supercontinent.

       

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