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藏东类乌齐地区花岗质片麻岩锆石Cameca U-Pb定年及其地质意义

文章导航 > 地质通报 > 2010 > 29(8): 1123-1128

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曾庆高1, 2,王保弟2, 3,强巴扎西2,尼玛次仁2,4, 李 虎2. 藏东类乌齐地区花岗质片麻岩锆石Cameca U-Pb定年及其地质意义[J]. 地质通报, 2010, 29(8): 1123-1128.
引用本文: 曾庆高1, 2,王保弟2, 3,强巴扎西2,尼玛次仁2,4, 李 虎2. 藏东类乌齐地区花岗质片麻岩锆石Cameca U-Pb定年及其地质意义[J]. 地质通报, 2010, 29(8): 1123-1128.
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ZENG Qing-gao1,2, WANG Bao-di2,3, QIANGBA Zha-xi2, NIMA Ci-ren2,4, LI Hu2. Zircon Cameca U-Pb dating of granitoid gneisses in the Leiwuqi area of the eastern Tibet, China and its geological implication[J]. Geological Bulletin of China, 2010, 29(8): 1123-1128.
Citation: ZENG Qing-gao1,2, WANG Bao-di2,3, QIANGBA Zha-xi2, NIMA Ci-ren2,4, LI Hu2. Zircon Cameca U-Pb dating of granitoid gneisses in the Leiwuqi area of the eastern Tibet, China and its geological implication[J]. Geological Bulletin of China, 2010, 29(8): 1123-1128.
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藏东类乌齐地区花岗质片麻岩锆石Cameca U-Pb定年及其地质意义

  • 1. 中国科学院广州地球化学研究所,广东 广州 510640; 2. 西藏地勘局区域地质调查大队,西藏 拉萨 851400;3.中国地质调查局成都地质矿产研究所,四川 成都 610081; 4. 中国地质大学,湖北 武汉 430000

Zircon Cameca U-Pb dating of granitoid gneisses in the Leiwuqi area of the eastern Tibet, China and its geological implication

  • 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China;2. Regional Geological Survey Party, Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa 851400, Tibet, China;3. Chengdu Institute of Geology and Mineral Resources,China Geological Survey, Chengdu 610081, Sichuan,China;4. China University of Geosciences, wuhan 430000, Hubei, China

    摘要
  • 西藏东部类乌齐一带吉塘岩群中新识别出一套花岗质片麻岩。花岗质片麻岩中锆石Th/U 比值较高(Th/U>0.49)，阴极发光图像显示锆石内部韵律环带明显，具典型岩浆锆石成因的特征。Cameca锆石U-Pb同位素加权平均年龄为282.1Ma±0.9 Ma，表明花岗岩岩体形成于早二叠世，暗示澜沧江结合带在早二叠世存在岩浆增生事件。
    The granitic gneiss was identified from the Jitang Group in the Leiwuqi area, eastern Tibet. All zircons from the granitic gneiss have shown regular oscillatory magmatic zoning and high Th/U ratios (>0.49), being consistent with those of magmatic zircons. So we quoted 206Pb/238U ages to indicate crystallization age of the granitic magma. Analysis of Cameca zircon U-Pb isotope yielded a weighted mean 206Pb/238U age of 282.1±0.9Ma. The age of granitic gneiss implies that this magmatism event was triggered by the southwest subduction of the Lancangjiang suture in early Permian. In another word, magmatic growth in Lancangjiang suture had been taken place during early Permian.
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刊出日期:  2010-08-15

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