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    中国百强科技报刊

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    中国高校百佳科技期刊

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    Volume 45 Issue 6
    Jun.  2020
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    Article Contents
    Xu Chang, Wang Yuejun, Qian Xin, Zhang Yuzhi, Yu Xiaoqing, 2020. Geochronological and Geochemical Characteristics of Early Silurian S-Type Granitic Gneiss in Takengon Area of Northern Sumatra and Its Tectonic Implications. Earth Science, 45(6): 2077-2090. doi: 10.3799/dqkx.2020.030
    Citation: Xu Chang, Wang Yuejun, Qian Xin, Zhang Yuzhi, Yu Xiaoqing, 2020. Geochronological and Geochemical Characteristics of Early Silurian S-Type Granitic Gneiss in Takengon Area of Northern Sumatra and Its Tectonic Implications. Earth Science, 45(6): 2077-2090. doi: 10.3799/dqkx.2020.030

    Geochronological and Geochemical Characteristics of Early Silurian S-Type Granitic Gneiss in Takengon Area of Northern Sumatra and Its Tectonic Implications

    doi: 10.3799/dqkx.2020.030
    • Received Date: 2019-12-21
    • Publish Date: 2020-06-15
    • Sumatra Island is located in the southwestern margin of the Sundaland, and is divided into East/West Sumatra by the Medial Sumatran Zone. While East Sumatran basement affinity and tectonic evolution are not well defined. The Early Paleozoic granitic gneisses have been identified from the East Sumatra Terrane, with providing zircon U-Pb age, in-situ Hf isotopic and geochemical results. Geochronological result yields a 206Pb/238U mean age of 442 ±5 Ma (MSWD = 1.03), representing the crystalline age. Zircon εHf (t) values range from -1.3 to -7.8. The whole-rock geochemical characteristics show that our samples are characterized by high SiO2 (69.97%-74.30%) and Al2O3 (13.90%-15.93%), but poor in TiO2 (0.48%-0.61%), MgO (0.54%-0.93%) and CaO (0.11%-0.25%). These samples have high A/CNK (2.58-3.06) and CIPW-normalized corundum (10.0%-11.4%), similar to those of the S-type granite. They have obvious fractionation between LREEs and HREEs. These samples are characterized by enrichment in LILEs (Rb, Th, U) and depletion in HFSEs (Nb, Ta, Ti). The geochemical results indicate that the Takengon granitic gneisses are originated from the partial melting of the meta-sediments during the evolution of the Prototethyan Ocean. This study confirms the existing of Early Silurian basement rocks in the East Sumatra Terrane, which were related to the Prototethyan evolution.

       

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