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    Volume 32 Issue 1
    Jan.  2007
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    Article Navigation >  Earth Science  > 2007  >  32(1): 22-28
    MA Li-yan, NIU Zhi-jun, BAI Yun-shan, DUAN Qi-fa, WANG Jian-xiong, 2007. Sr, Nd and Pb Isotopic Geochemistry of Permian Volcanic Rocks fromSouthern Qinghai and Their Geological Significance. Earth Science, 32(1): 22-28.
    Citation: MA Li-yan, NIU Zhi-jun, BAI Yun-shan, DUAN Qi-fa, WANG Jian-xiong, 2007. Sr, Nd and Pb Isotopic Geochemistry of Permian Volcanic Rocks fromSouthern Qinghai and Their Geological Significance. Earth Science, 32(1): 22-28.
    shu

    Sr, Nd and Pb Isotopic Geochemistry of Permian Volcanic Rocks fromSouthern Qinghai and Their Geological Significance

    • Institute of Geology and Mineral Resources, Yichang 443003, China

    • Received Date: 2006-03-11
    • Publish Date: 2007-01-25
      Abstract
    • Isotopic ratios of Sr, Nd and Pb were analyzed for the Permian volcanic rocks in the Zhiduo and Zaduo areas of southern Qinghai which is located at the Qamdo block. The analytical results of the sample rocks are as follows: ISr = 0.703 33 -0.704 17, εNd(t) =4.1-5.5, 206Pb/204Pb=17.547-17.986, 207Pb/204Pb=15.476-15.584, 208Pb/204Pb= 37.778-37.976. Combined with lithological and geochemical research findings, the above results indicate that the volcanic rock is of OIB type and came into formation in the stretching rift tectonic environment. It falls into the Late Palaeozoic rift system of the Qinghai-Tibet Plateau and its adjacent areas. The primitive magma might have originated from the deplected asthenosphere and the continental breakup is related to the activity of mantle plume. With the V1 and V2 of the lead isotopic ratios ranging from 31.39 to 46.78, 22.38 to 42.45 respectively, the lead isotope of the rock samples can be labeled the Yangtze lead isotopes, which indicates that the Qamdo block belonged to Tethyan realm during Late Palaeozoic and was a part of the Pan-Cathaysian continental group or Yangtze Plate.

       

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    • 致谢: 本文是在青藏高原野外区域地质调查的材料基础上完成的, 特此向参加野外工作的宜昌地质矿产研究所区调队全体同仁和后勤人员表示感谢.在成文过程中得到了李华芹研究员、李志昌研究员和路远发研究员的悉心指导和审阅, 在此表示衷心谢意.
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