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    Volume 34 Issue 1
    Jan.  2009
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    Article Navigation >  Earth Science  > 2009  >  34(1): 56-74
    TANG Gong-jian, WANG Qiang, ZHAO Zhen-hua, Derek A·Wyman, CHEN Hai-hong, JIA Xiao-hui, JIANG Zi-qi, 2009. Geochronology and Geochemistry of the Ore-Bearing Porphyries in the Baogutu Area (Western Junggar): Petrogenesis and Their Implications for Tectonics and Cu-Au Mineralization. Earth Science, 34(1): 56-74.
    Citation: TANG Gong-jian, WANG Qiang, ZHAO Zhen-hua, Derek A·Wyman, CHEN Hai-hong, JIA Xiao-hui, JIANG Zi-qi, 2009. Geochronology and Geochemistry of the Ore-Bearing Porphyries in the Baogutu Area (Western Junggar): Petrogenesis and Their Implications for Tectonics and Cu-Au Mineralization. Earth Science, 34(1): 56-74.
    shu

    Geochronology and Geochemistry of the Ore-Bearing Porphyries in the Baogutu Area (Western Junggar): Petrogenesis and Their Implications for Tectonics and Cu-Au Mineralization

    • 1.

      Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

    • 2.

      Graduate School of Chinese Academy of Sciences, Beijing 100049, China

    • 3.

      School of Geosciences, Division of Geology and Geophysics, University of Sydney, NSW2006, Australia

    • 4.

      State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

    • Received Date: 2008-10-30
    • Publish Date: 2009-01-25
      Abstract
    • The small porphyry plutons or dikes in the Baogutu area, western Junggar, have attracted wide attentions owing to the close association between them and Cu-Au mineralization.This paper presents new LA-ICP-MS zircon U-Pb age and geochemical data of ore-bearing porphyries in the Baogutu area.The quartz diorite porphyry bodies Ⅱ and Ⅴ and diorite porphyry body Ⅲ have crystallization ages of 314.9±1.7Ma, 309.9±1.9Ma, and 313.9±2.6Ma, respectively, suggesting they were generated in Late Carboniferous.They are characterized by high Na2O/K2O and high Sr values but low Y and Yb contents, and negligible Eu anomalies, similar to adakites.In addition, some samples have high MgO (3.93%-4.78%) and Mg# (47-74) values, similar to high-Mg andesite.Taking into account the data of regional geology and magmatic rocks, we suggest that (1) The Baogutu intrusive rocks were possibly formed in an island-arc setting linking to ocean ridge suduction in Late Carboniferous, the adakitic magmas have likely formed by partial melting of the leading edge of the subducted ridge, and high-Mg diorites possibly originated from the interaction between adakitic melts and mantle peridotite; (2) The Baogutu Cu-Au mineralization might occur above a slab window during ocean ridge suduction, and the interaction between high oxygen fugacity slab melt and mantle peridotite caused the decomposition of metal sulfides and the Cu and Au mineralization.

       

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