Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (1): 91-104.doi: 10.13278/j.cnki.jjuese.201601109

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Infrared Micro-Thermometry of Fluid Inclusions in Sphalerite and Geological Significance of Huize Super-Large Zn-Pb-(Ge-Ag) Deposit, Yunnan Province

Han Runsheng1, Li Bo1, Ni Pei2, Qiu Wenlong1, Wang Xudong2, Wang Tiangang2   

  1. 1. Faculty of Land and Resource Engineering, Kunming University of Science and Technology/Southwest Institute of Geological Survey, Geological Survey Centre for Nonferrous Metals Resources, Kunming 650093, China;
    2. State Key Laboratory for Mineral Deposit Research/Institute of Geo-Fluids/School of Earch Science and Engineering, Nanjing University, Nanjing 210093, China
  • Received:2014-05-12 Online:2016-01-26 Published:2016-01-26
  • 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), and Projects of YMLab and Innovation Team of Yunnan Province (2010) and KMUST(2008)

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Abstract:

Infrared micro-thermometry technique is efficient to study fluid inclusions in opaque-translucent minerals by connecting the infrared microscopy with cooling-heating table. The sphalerite-hosted fluid inclusions in Huize super-large Zn-Pb-(Ag-Ge) deposit have been studied by this technique. There are six types of sphalerite-hosted fluid inclusions, including pure gaseous inclusions(V), pure liquid inclusions(L), gas-aqueous inclusions with aqueous-rich(L+V), gas-aqueous inclusions with rich gas(L+V), three-phase inclusions containing a daughter(L+V+S), and LCO2+LH2O+VCO2 three-phase inclusions. Two types of gas-aqueous fluid inclusions with rich liquid and pure liquid(L) can be only seen in calcite. The homogenous temperature of sphalerite-hosted fluid inclusions ranges from 100 to 364℃, in which two distinct temperature sectors are 150-221℃ and 320-364℃, with the average capture temperature 232℃. The salinity of sphalerite-hosted fluid inclusions has three distinct sectors of 1.1%-5.0%, 5.0%-11.0%,and 12.0%-18.0%. The homogenous temperatures of sphalerite-hosted fluid inclusions of different mineralization stages reflect the evolution of the ore-forming fluids in the whole process; while the calcite-hosted fluid inclusions indicate the middle and late mineralization stages of the ore-forming fluids. Comparing with the paragenetic gangue mineral, the homogenous temperatures of fluid inclusions in sphalerite are higher, which indicates that sphalerite-hosed fluid inclusions carry more information of ore-forming fluids. From early to late mineralization stages, ore-forming fluids might have experienced the evolution of medium-high temperature and medium salinity →medium-low temperature and medium salinity →medium-low temperature and medium-low salinity. The capture temperature of fluid inclusions reflects that ore-forming fluids of early stage occurred in medium-high temperature. The features further confirm that different from the typical MVT Zn-Pb deposit, Huize deposit is not a low-temperature deposit. The infrared micro-thermometry technique has provided an ideal method to study the p-T-x conditions of ore-forming fluids and the genesis of Zn-Pb deposits in the northeast Yunnan Province.

Key words: fluid inclusions in sphalerite, infrared micro-thermometry, genesis of HZT-type deposit, Huize super-large Ge-rich zinc-lead deposit, northeastern Yunnan deposit concentration district

CLC Number: 

  • P618.4

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