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Geochronology of Baogutu porphyry copper deposit in Western Junggar area, Xinjiang of China

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Abstract

Baogutu copper deposit in Western Junggar area is a mesoscopic porphyry deposit found in recent years. Study on its geochronology will help further understand ore genesis and regional ore-forming pattern. A series of small quartz-diorite and granodiorite stocks outcrop at Baogutu area, numbered I–X according to their size. A detailed exploration on Number V stock confirmed it as a mesoscopic scale copper deposit, and various exploration work has been carried out on other stocks with ore-forming evidence. This paper studies geochronology of Number V stock using zircon SHRIMP U-Pb and single mineral K-Ar method. Twenty-five SHRIMP ages yield two 206Pb/238U weighed mean ages of 335.6 ± 7.8 Ma and 311.4 ± 3.3 Ma respectively. The older date is considered to be inherited zircon from either surrounding rock tuff or deep granitoid batholith, whereas the younger date is the formation age of ore-bearing intrusion. K-Ar ages of ore-forming biotites, 296.0 ± 3.7 Ma and 297.3 ± 3.8 Ma, in combination with Re-Os age of molybdenite, 310 Ma, confirm the ore-forming age of 310−296 Ma. Granophyre and dioritic porphyrite dikes cut Number V stock and their K-Ar ages range from 278 to 240 Ma, which confine the lower boundary of the mineralization. The framework of Baogutu ore-forming geochronology can be established based on these data.

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Authors and Affiliations

  1. The Key Laboratory of Orogenic Belt and Crustal Evolution, MOE, Peking University, Beijing, 100871, China

    YuLin Liu & LiShuang Guo

  2. North China Institute of Science and Technology, Beijing, 101601, China

    YuDe Liu

  3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China

    HuiXia Song & Biao Song

  4. Beijing SHRIMP Center, Beijing, 100037, China

    YuLin Liu, HuiXia Song & Biao Song

  5. Institute of Geology, Xinjiang Nonferrous Geo-exploration Bureau, Urumqi, 830000, China

    Rui Zhang, FaJun Xu & YunXiao Zhang

Authors
  1. YuLin Liu
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  2. LiShuang Guo
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  3. YuDe Liu
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  4. HuiXia Song
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  5. Biao Song
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  6. Rui Zhang
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  7. FaJun Xu
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  8. YunXiao Zhang
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Corresponding author

Correspondence to YuLin Liu.

Additional information

Supported by China Geological Survey (Grant No. 1212010630603) and National Science and Technology Supporting Program (Grant No. 2006BAB07B08)

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Liu, Y., Guo, L., Liu, Y. et al. Geochronology of Baogutu porphyry copper deposit in Western Junggar area, Xinjiang of China. Sci. China Ser. D-Earth Sci. 52, 1543–1549 (2009). https://doi.org/10.1007/s11430-009-0127-7

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  • DOI: https://doi.org/10.1007/s11430-009-0127-7

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