Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (3): 711-721.doi: 10.13278/j.cnki.jjuese.201603109

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Alteration Zoning and Geochemical Element Migration in Alteration Rock of Zhaotong Lead-Zinc Deposit in Northeastern Yunnan Mineralization Concentration Area

Chen Suihai1,2, Han Runsheng1, Shentu Liangyi1, Wu Peng1, Qiu Wenlong1, Wen Dexiao1   

  1. 1. Faculty of Land and Resource Engineering, Kunming University of Science and Technology/South-West Institute of Geological Survey Centre for Nonferrous Metals Resources, Kunming 650093, China;
    2. Faculty of Civil Engineering and Architecture, Kunming University of Science and Technology, Kunming 650500, China
  • Received:2015-10-07 Online:2016-05-26 Published:2016-05-26
  • Supported by:

    Supported by the National Natural Science Foundation (U1133602, 40863002, 41572060);Main Program for the Natural Science Foundation of Yunnan Province (2010CC005);Special Exploration Program for National Crisis Mines(20089943);Projects of YMLab(2010) and Innovation Team of Yunnan Province (2010) and KMUST(2008)

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Abstract:

Wall-rock alteration is one of the important ore-prospecting clues in the Zhaotong lead-zinc deposit. Based on the studies of the alteration zoning and element migration in altered rock of the No.98 profile line in the 760 m level of this deposit, we discussed the relationship between the alteration and the mineralization. There develops obvious hydrothermal alteration zonation, from the center of the ore body to outside, alteration gradually weakened. In the altered center, the pyritization is most intensive, followed by dolomitization and calcitization, and silicification is the weakest, and the pyritization is closely related to mineralization. Far away from the ore body, pyritization weakened gradually, calcitization and dolomitization increased gradually. The intensive pyritization and the intensive pyritization-calcitization-silicification coarse-grained dolomite alteration are important prospecting clues. From fine-grained dolomite zone to the intensive pyritization zone, such elements as Ge, Ag and Cd, which have a close relationship to Zn-Pb of ore-forming, migrate in as a whole. Meanwile, both iron and Pro iron elements markedly enriched accompanying by the ore-forming fluids elements, which indicates that different alteration facies were reformed by the hydrothermal fluids. The index of alteration(IA) has the positive correlation with the alteration intensity.

Key words: alteration rock zoning, element migration, Zhaotong lead-zinc deposit, northeastern Yunnan mineralition concentration area, Huize type (HZT) Pb-Zn deposit

CLC Number: 

  • P618.4

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