J4 ›› 2011, Vol. 41 ›› Issue (5): 1407-1422.

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40Ar-39Ar Dating and Lead Isotopes of Liubagou Gold Deposit, Inner Mongolia

ZHANG Yong-mei1, GU Xue-xiang1, CHENG Wen-bin1, DONG Shu-yi1|2, HUANG Zhi-quan3, LI Fu-liang3, YANG Wei-long3   

  1. 1．State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Beijing100083, China;
    2．College of Earth Sciences, Chengdu University of Technology, Chengdu610059, China;
    3．No. 2 Gold Geological Party of Chinese Armed Police Force, Huhhot010010|China
  • Received:2011-05-19 Online:2011-09-26 Published:2011-09-26

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Abstract:

Located in the northern margin of North China craton, the Liubagou gold deposit of Inner Mongolia is a large ore deposit characterized by widespread K-feldsparthization. The authors  apply the 40Ar-39Ar isotopic dating of K-feldspar to define the mineralization age, and give a detailed study on the Pb isotopes of ore. In the density map of 40Ar-39Ar age, the peak region of 260-360 Ma is accordant with the main emplacement ages of the intrusions (220-350 Ma). Combining with the published isotopic geochronology data of adjacent region, the 40Ar-39Ar plateau age of （217.9±3.1） Ma indicates that the Liubagou gold deposit formed in the Early Indosinian. The upper intersection point age of lead is 224 Ma, it may represent the main magmatic hydrothermal mineralization ages and serve a test for the reliability of the 40Ar-39Ar dating. Consequently, the Hercynian-Indosinian magmatism was favorable to the widely distributed alkali metasomatism and gold pre-enrichment. The latest magmatic activity of Indosinian (about 220 Ma) induced the magmatic hydrothermal mineralization directly. The age of source region is 2.5 Ga by calculation of Pb isotopic data, indicating that the ore-forming materials primarily came from the strata of the Archean Wulashan Group.

Key words: 40Ar-39Ar geochronology, lead isotope, Liubagou gold deposit, Inner Mongolia

CLC Number: 

  • P597
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