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LI Wei-dong, TU Qi-jun, GAO Yong-feng, YANG Zai-feng. Zircon SHRIMP U-Pb dating of gneissic granite bodies in the Lubai Mountain of Hami, Xinjiang, and its geological significance[J]. GEOLOGY IN CHINA, 2010, 37(5): 1273-1283.
Citation: LI Wei-dong, TU Qi-jun, GAO Yong-feng, YANG Zai-feng. Zircon SHRIMP U-Pb dating of gneissic granite bodies in the Lubai Mountain of Hami, Xinjiang, and its geological significance[J]. GEOLOGY IN CHINA, 2010, 37(5): 1273-1283.
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Zircon SHRIMP U-Pb dating of gneissic granite bodies in the Lubai Mountain of Hami, Xinjiang, and its geological significance

  • 1.

    China University of Geosciences, Beijing 100083, China

  • 2.

    Xinjiang Geological Prospecting Fund Management Center, Urumqi 830000, Xinjiang, China

  • 3.

    Geological Academy of Xinjiang, Urumqi 830011, Xinjiang China

  • 4.

    No. 9 Geological Party, Xinjiang Bureau of Geological Exploration and Development for Mineral Resources, Urumqi 830011, Xinjiang, China

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  • Abstract：Some gneissic granite bodies are exposed in the Lubai Mountain of Hami area, Xinjiang. Zircons from these rocks were dated at （1453±15） Ma by SHRIMP, suggesting that their intrusion occurred in middle Proterozoic. Data of major elements and trace elements show that the gneissic granite bodies are enriched in MgO, FeOt, CaO, depleted in alkaline-earth metals and have low K2O/Na2O ratios. REE partition patterns are inclined to the right. The lithophile elements are obviously concentrated whereas Nb and Ta are depleted relative to MOR granite, suggesting characteristics of I type granite. These data provide important information for the possible geological event of the closure of South Tianshan Ocean in Proterozoic.
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