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    裴先治, 孙仁奇, 丁仨平, 刘会彬, 李佐臣, 刘战庆, 孟勇. 陇东地区阎家店闪长岩LA-ICP-MS锆石U-Pb测年及其地质意义[J]. 中国地质, 2007, 34(1): 8-16.
    引用本文: 裴先治, 孙仁奇, 丁仨平, 刘会彬, 李佐臣, 刘战庆, 孟勇. 陇东地区阎家店闪长岩LA-ICP-MS锆石U-Pb测年及其地质意义[J]. 中国地质, 2007, 34(1): 8-16.
    PEI Xian-zhi, SUN Ren-qi, DING Sa-ping, LIU Hui-bin, LI Zuo-chen, LIU Zhan-qing, MENG Yong. LA-ICP-MS zircon U-Pb dating of the Yanjiadian diorite in the eastern Qilian Mountains and its geological significance[J]. GEOLOGY IN CHINA, 2007, 34(1): 8-16.
    Citation: PEI Xian-zhi, SUN Ren-qi, DING Sa-ping, LIU Hui-bin, LI Zuo-chen, LIU Zhan-qing, MENG Yong. LA-ICP-MS zircon U-Pb dating of the Yanjiadian diorite in the eastern Qilian Mountains and its geological significance[J]. GEOLOGY IN CHINA, 2007, 34(1): 8-16.

    陇东地区阎家店闪长岩LA-ICP-MS锆石U-Pb测年及其地质意义

    LA-ICP-MS zircon U-Pb dating of the Yanjiadian diorite in the eastern Qilian Mountains and its geological significance

    • 摘要: 提要:祁连造山带东段的陇山杂岩中出露有较多的加里东期和印支期岩浆侵入岩类,但缺乏精确的年代学资料。对该区阎家店闪长岩体的LA-ICP-MS锆石U-Pb测年结果确定:闪长岩体形成的同位素地质年代为(440.2±0.92)Ma(MSWD=1.13),表明闪长岩体所代表的岛弧杂岩系形成于晚奥陶世。区域地质及构造演化研究表明,该区曾在中晚奥陶世发生以红土堡蛇绿岩为代表的洋壳向北的俯冲作用,并产生中晚奥陶世陈家河群岛弧型火山-沉积岩系和晚奥陶世以阎家店闪长岩体为代表的岛弧岩浆杂岩带。

       

      Abstract: Abstract:Plentiful Caledonian and Indosinian intrusive rocks outcrop in the Longshan complex in the eastern Qilian Mountains, but accurate chronological data are lacking. LA-ICP-MS zircon U-Pb dating of the Yanjiadian diorite in the Zhangjiachuan-Qingshui area of the eastern Qilian Mountains indicates that the isotopic age of the diorite is 440.2±0.92 Ma(MSWD=1.13),which suggests that the island-arc complex represented by the Yanjiadian diorite formed in the Late Ordovician. Studies of regional geology and tectonic evolution indicate that in this area there occurred northward subduction of oceanic crust represented by the Hongtubao ophiolite during the Middle-Late Ordovician and island-arc magmatic complex zones represented by island-arc type volcanic-sedimentary series of the Middle-Late Chenjiahe Group and the Late Ordovician Yanjiadian diorite body.

       

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