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青藏高原北部巴颜喀拉山群英安质沉凝灰岩LA-ICP-MS锆石U-Pb年龄

文章导航 > 地质通报 > 2015 > 34(05): 809-814

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张耀玲1,2, 胡道功2, 吴珍汉3, 郝 爽4, 刘嘉麒5. 青藏高原北部巴颜喀拉山群英安质沉凝灰岩LA-ICP-MS锆石U-Pb年龄[J]. 地质通报, 2015, 34(05): 809-814.
引用本文: 张耀玲1,2, 胡道功2, 吴珍汉3, 郝 爽4, 刘嘉麒5. 青藏高原北部巴颜喀拉山群英安质沉凝灰岩LA-ICP-MS锆石U-Pb年龄[J]. 地质通报, 2015, 34(05): 809-814.
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ZHANG Yaoling1,2, HU Daogong1, WU Zhenhan2, HAO Shuang4, LIU Jiaqi5. LA-ICP-MS zircon U-Pb ages for dacitic tuffite from Bayan Har Group, northern Tibetan Plateau[J]. Geological Bulletin of China, 2015, 34(05): 809-814.
Citation: ZHANG Yaoling1,2, HU Daogong1, WU Zhenhan2, HAO Shuang4, LIU Jiaqi5. LA-ICP-MS zircon U-Pb ages for dacitic tuffite from Bayan Har Group, northern Tibetan Plateau[J]. Geological Bulletin of China, 2015, 34(05): 809-814.
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青藏高原北部巴颜喀拉山群英安质沉凝灰岩LA-ICP-MS锆石U-Pb年龄

  • 1.中国地质大学(北京)地球科学与资源学院,北京 100083;2.中国地质科学院地质力学研究所,北京100081;3.中国地质科学院,北京 100037;4.天津地质矿产研究所,天津 300170;5.中国科学院地质与地球物理研究所,北京100029

LA-ICP-MS zircon U-Pb ages for dacitic tuffite from Bayan Har Group, northern Tibetan Plateau

  • 1. College of Earth Science and Resources, China University of Geoscience, Beijing 100083, China;2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;3. Chinese Academy of Geological Sciences, Beijing 100037, China;4. Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China;5. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

    摘要
  • 应用激光烧蚀多接收器电感耦合等离子体质谱仪（LA-ICP-MS）方法，对青藏高原北部卡巴纽尔多湖西牙扎康塞一带巴颜喀拉山群碎屑岩系英安质沉凝灰岩夹层中的锆石进行了U-Pb同位素测定。研究结果表明，除1个继承锆石206Pb/238U年龄为419±3Ma外，其余20个岩浆锆石的206Pb/238U年龄变化于242~254Ma之间，其中7个测点的206Pb/238U年龄加权平均值为244±2Ma（MSWD=1.3），代表了火山岩的喷发年龄，说明该地区巴颜喀拉山群形成于中三叠世早期，而非传统认为的晚三叠世。该套地层时代的确定，为进一步研究巴颜喀拉山群的物质组成与形成时代提供了新的证据。
    Using laser ablation multiple collector inductively coupled plasma mass spectrometry （LA-ICP-MS）method, the authors determined U-Pb isotopes of the zircon from the dacitic tuffite interlayer of Bayan Har Group pyroclastic rock system of Yazhakangsai area in west Kabaniuerdo Lake of northern Tibetan Plateau. Except for one inherited zircon whose 206Pb/238U age is 419±3Ma, the 206Pb/238U ages of 20 magmatic zircons vary from 242Ma to 254Ma, with the average 206Pb/238U age calculated from 7 samples being 244±2Ma（MSWD=1.3）, which suggests that the formation of Bayanhar Group in this region took place in early Middle Triassic rather than in Late Triassic as considered by previous researchers. The determination of the stratigraphic age provides new evidence for further study of composition and formation age of Bayan Har Group.
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刊出日期:  2015-05-15

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