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Zircon LA-ICP-MS U-Pb dating and Sr-Nd isotope study of the Guposhan granite complex, Guangxi, China

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Abstract

Zircon U-Pb dating by the LA-ICP-MS method was applied to determining the ages of different units of the Guposhan granite complex, among which the East Guposhan unit is 160.8±1.6 Ma, the West Guposhan unit is 165.0±1.9 Ma, and the Lisong unit is 163.0±1.3 Ma in age. Much similarity in ages of the three units has thus proved that the whole Guposhan granite complex was formed in the same period of time. They were the products of large-scale granitic magmatism through crust-remelting in the first stage of the Middle Yanshanian in South China. However, the three units have differences both in petrology and in geochemistry. Besides the differences in major, trace and rare-earth elements, they are distinct in their Rb-Sr and Sm-Nd isotopic compositions. The East Guposhan unit and Lisong unit and its enclaves have a similar (87Sr/86Sr)i value of 0.7064 with an average of ɛNd(t)=−3.03, indicating that more mantle material was evolved in the magma derivation; whereas the West Guposhan unit has a higher (87Sr/86Sr)i value of 0.7173 but a lower ɛNd(t) value of −5.00, and is characterized by strong negative Eu anomalies and higher Rb/Sr ratios, suggesting that its source materials were composed of relatively old crust components and new mantle-derived components. In addition, an inherited zircon grain in the East Guposhan unit (GP-1) yielded a 206Pb/238U age of 806.4 Ma, which is similar to the ages of the Jiulin cordierite granite in northern Jiangxi and of the Yinqiao migmatic granite in Guangxi in the HZH granite zone. All this may provide new evidence for Late Proterozoic magmatism in the HZH granite zone.

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Authors and Affiliations

  1. State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing, 210093, China

    Gu Shengyan, Hua Renmin & Qi Huawen

  2. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China

    Qi Huawen

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  1. Gu Shengyan
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  2. Hua Renmin
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  3. Qi Huawen
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Correspondence to Hua Renmin.

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Gu, S., Hua, R. & Qi, H. Zircon LA-ICP-MS U-Pb dating and Sr-Nd isotope study of the Guposhan granite complex, Guangxi, China. Chin. J. of Geochem. 26, 290–300 (2007). https://doi.org/10.1007/s11631-007-0290-5

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  • DOI: https://doi.org/10.1007/s11631-007-0290-5

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