Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (2): 442-454.doi: 10.13278/j.cnki.jjuese.20200058

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40Ar-39Ar Geochronological Characteristics of Diabase in Lujing Area of Middle Zhuguangshan

Li Jie, Huang Hongye, Liu Zijie, Zhang Tao, Wang Qianlin, Jiang Hong'an, Zou Mingliang   

  1. Research Institute No. 230, CNNC, Changsha 430007, China
  • Received:2020-03-09 Published:2021-04-06
  • Supported by:
    Supported by the National Key R&D Program of China(2017YFC0602600) and the China National Nuclear Corporation Project (3210402)

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Abstract: The Zhuguang-Guidong area is the most important granite-related hydrothermal uranium ore deposit cluster in South China. The Mesozoic mafic dykes are widely distributed in this area, and they are closely associated with the uranium mineralization. In order to confirm the geochronological data of the mafic dykes and the uranium metallogenic time,a whole-rock 40Ar-39Ar analysis was carried out. The 40Ar-39Ar isotopic ages of the whole diabase are (171.7±1.6) Ma and (169.1±3.8) Ma, indicating that the Lujing area underwent a lithosphere extension in the Middle Jurassic (170 Ma). The results show that at least five major episodes of mafic dykes occurred at 200, 170, 140, 105, and 90 Ma, and at least six major events of uranium mineralization occurred at 195, 165, 125, 90, 75, and 55 Ma, which is consistent with the previously published geochronological data. The ore-forming hydrothermal fluid followed right after each regional basalt event (5-20 Ma),so the uranium mineralization was closely related to the regional basalt events represented by the diabase wall in time, space, and genesis. The correlation between the diabase veins and metallogenic structures and the genesis characteristics of the shallow forms of the mantle hypomagma indicate that it may provide a certain amount of volatile matter (mineralizer) for uranium mineralization and the enrichment place for ore deposits;The ore-forming hydrothermal fluid may improve the carrying capacity of uranium and promote uranium mineralization.

Key words: diabase, 40Ar-39Ar age, uranium mineralization, granite-related uranium, Lujing area

CLC Number: 

  • P588.12
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