温志刚, 王洪强, 杜尧, 刘松柏, 王嘉伟. 新疆西准噶尔业姆奇花岗岩体形成时代及其构造意义[J]. 地质通报, 2019, 38(8): 1297-1305.
    引用本文: 温志刚, 王洪强, 杜尧, 刘松柏, 王嘉伟. 新疆西准噶尔业姆奇花岗岩体形成时代及其构造意义[J]. 地质通报, 2019, 38(8): 1297-1305.
    WEN Zhigang, WANG Hongqiang, DU Yao, LIU Songbai, WANG Jiawei. The formation age and tectonic significance of Yemuqi granite in West Junggar, Xinjiang[J]. Geological Bulletin of China, 2019, 38(8): 1297-1305.
    Citation: WEN Zhigang, WANG Hongqiang, DU Yao, LIU Songbai, WANG Jiawei. The formation age and tectonic significance of Yemuqi granite in West Junggar, Xinjiang[J]. Geological Bulletin of China, 2019, 38(8): 1297-1305.

    新疆西准噶尔业姆奇花岗岩体形成时代及其构造意义

    The formation age and tectonic significance of Yemuqi granite in West Junggar, Xinjiang

    • 摘要: 对新疆西准噶尔南部地区与早古生代蛇绿岩紧密伴生的业姆奇花岗岩体岩石学、岩石地球化学、同位素年代学进行研究,认为业姆奇花岗岩为低钾(拉斑)系列,岩石地球化学特征具板内靠近岛弧区域特征。通过对二长花岗岩LA-ICP-MS锆石U-Pb测年,获得比较准确的年龄数据539.7±2.6Ma,表明其形成时代为早寒武世,该侵入岩作为西准噶尔地区最老的岩浆活动产物,代表了在诺丁尼亚统一大陆形成之后早期裂解阶段古洋盆初期的地质记录。

       

      Abstract: In this paper, the petrology, lithogeochemistry, and isotope chronology of Yemuqi granite closely associated with Early Paleozoic granite in the southern part of West Junggar, Xinjiang, were studied in detail. It is considered that the granite belongs to low potassium (tholeiitic) series. The rock geochemistry shows the characteristics of the intraplate close to island arc region. The authors obtained accurate age data of 539.7±2.6Ma by LA-ICP-MS zircon U-Pb dating of the monzonite granite. It is shown that the age of its formation was Early Cambrian. The intrusive rock is the oldest product of magmatic activity in the West Junggar area, which represents the geological record of the early stage of the splitting in the Early Paleoceanic Basin after the formation of the united continent of Nodingnia.

       

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