Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (6): 1711-1723.doi: 10.13278/j.cnki.jjuese.201606110

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Geochemical Characteristics of Primary Halos in No. I Ore Body of Keyue Pb-Zn-Sb-Ag Polymetallic Deposit, Tibet

Cheng Wenbin1,2, Yin Li3, Chen Cuihua1,2, Song Yukun4, Li Guanqing5, Zhang Xingguo5, Xia Baoben5, Dawa Ciren5   

  1. 1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610051, China;
    2. Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Ministry of Land and Resources, Chengdu University of Technology, Chengdu 610051, China;
    3. Pujiang County Land Resources Bureau, Chengdu 611630, China;
    4. Heilongjiang Province Regional Geological Survey, Harbin 150036, China;
    5. Regional Geological Survey Team, Tibet Bureau of Geology and Exploration, Lhasa 851400, China
  • Received:2016-03-23 Online:2016-11-26 Published:2016-11-26
  • Supported by:
    Supported by Doctoral Fund of Ministry of Education of China (20125122120013), National Natural Science Foundation of China (41302066), National Natural Science Foundation of China (General Program; 41372093) and National Mineral Resources Potential Evaluation Project (1212010813025, 1212011121023)

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Abstract: The Keyue Pb-Zn-Sb-Ag polymetallic deposit is located in the Himalaya metallogic belt between the IYS and STDS. The general exploration shows that ore bodies above 4 300 m are mainly distributed in calcareous slate within thin micrite of the Ridang Formation(J1r) and strictly controlled by N-E faults. While deep extension of ore bodies are unknown. Based on the analysis of geochemical characteristics of the primary halos about the No. I ore body, the deep extension is discussed in this paper. Studies show that the frontal elements are Hg, As, Tl and the near-ore indicator elements are Pb, Zn, Sb, Ag, Au, Cd, Cu, Mn and the rear elements are Sn, In, Bi. According to the Grigorian's zoning index method and the barycenter method, the axail zoning downward follows in the sequences of In-Mn-As-Cu-Zn-Cd-Bi-Pb-Sn-Hg-Tl-Ag-Au-Sb (the Grigorian's zoning index method) and In-Mn-As-Cu-Cd-Zn-Hg-Bi-Sn-Pb-Ag-Sb-Tl-Au (the barycenter method). The change rules of the primary halos geochemical parameters are discussed, the erosion parameters models are established by the geometric averages of elements, and the ideal zoning models of the primary dispersion halos is established by comprehensive analysis. In conclusion, the speculative results can be listed as followings. Firstly, there are multiple superposition of mineralization. Secondly, there are ore bodies eroded to tail at the upper section, Thirdly, some ore bodies may extend to the depth.

Key words: geochemical characteristics of primary halos, zoning sequence, polymetallic deposit, Keyue deposit, Tibet

CLC Number: 

  • P618.4
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