Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (3): 706-718.doi: 10.13278/j.cnki.jjuese.201703106

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Ore-Forming Fluid Characteristics of the Jinman Vein-Type Copper Deposits in the Western Lanping Basin and Its Metallogenic Significance

Zhang Jinrang1,2, Wen Hanjie2, Zou Zhichao3   

  1. 1. Chengdu Center, China Geological Survey, Chengdu 610081, China;
    2. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
    3. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
  • Received:2016-11-26 Online:2017-05-26 Published:2017-05-26
  • Supported by:
    Supported by National Natural Science Foundation for Young Scientists of China (41403038,41403036) and Geological Survey Projects of China Geological Survey (121201010000150016)

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Abstract: A large number of sediment-hosted vein-type copper deposits controlled by a thrust-nappe system have been discovered in the west part of the Lanping basin, among which, the Jinman deposit is the largest in tonnage scale and with the highest Cu grade. The mineralization process of this deposit can be divided into three stages, including the early stage (pre-ore quartz-ankerite vein stage), the major stage (massive polymetallic sulphide-quartz vein stage), and the late stage (carbonate-quartz stage). The detailed studies of fluid inclusions distinguishes three types of fluid inclusions dominated by aqueous water in both pre-ore and syn-ore quartz from the Jinman deposit, including aqueous water, CO2-bearing, and pure CO2 inclusions. There is no obvoius difference between pre-ore and syn-ore quartz in terms of the type of fluid inclusions and microthermometric parameters of their CO2-bearing inclusions. The homogenization temperatures of CO2-bearing inclusions in both pre-ore and syn-ore quartz vary from 217 to 334 ℃(peak at 240~320 ℃), with corresponding salinities ranging from 1% to 4%. The homogenization temperatures of aqueous inclusions in both pre-ore and syn-ore quartz vary from 143 ℃ to 239 ℃(peak at 160~230 ℃), much lower than those of CO2-bearing inclusions. However, the salinities of aqueous inclusions show significant difference between pre-ore (3.1%~18.0%) and syn-ore quartz (4.1%~22.8%). Quartz-calcite vein in the late mineralizing stage only have aqueous inclusions, with homogenization temperature of 120~185 ℃, and salinities of 1.4%~9.3%. The fluid inclusion characteristics, together with other evidence, indicate that (1) there are two fluid systems responsible for Cu mineralization in the Jinman deposit one is deep crustal fluids, characterized by high CO2 content and relatively low salinities, and the other is basin brine, characterized by relatively high salinities and low temperatures. (2)The fluid mixing, without boiling or phase separation, might be the major precipitation mechanism.

Key words: ore-forming fluid, sediment-hosted vein-type copper deposits, Jinman vein-type copper deposit, Lanping basin

CLC Number: 

  • P618.41
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