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Fluid inclusion study of the Huangshaping polymetallic deposit, Hunan Province, South China TEXT SIZE: A A A

Huangshaping W-Mo-Pb-Zn polymetallic deposit is located in southeastern Hunan Province, South China. The mineralizations are associated with granite porphyry and quartz porphyry. Tungsten-molybdenum ore bodies occur as disseminated ore in skarn between quartz porphyry and carbonate rocks, while lead-zinc sulfide ores occur as veins outward the skarn, or within carbonate country rocks. The mineralization process can be generally divided into two stages. Skarn stage is associated with W-Mo mineralization and sulfide stage is associated with Pb-Zn mineralization. The fluid inclusions in garnet and actinolite are characterized by coexisting brine and vapor-rich fluid inclusions, indicating an immiscible condition. Using the homogenization temperatures (528 degrees C to >600 degrees C) and salinity of brine (40% similar to 45. 5% NaCleqv), trapping pressure can be estimated to be 600 similar to 800bars, equivalent to a depth of 2. 2 similar to 3. 2km. Tungsten mineralization from later skarn stage was formed under boiling condition, characterized by fluid inclusion with high temperature (400 similar to 460 degrees C), high salinity (40% similar to 45% NaCleqv). The pressure is estimated to be 200 similar to 400 bar, equivalent to a depth of 0. 7 1. 5km. At the sulfide stage, vapor-rich, liquid-rich and CO2-rich inclusions from quartz are coexisting in molybdenite-bearing quartz vein, indicating boiling at narrow range of temperatures from 300 similar to 340 degrees C and wide range of salinity from 5. 86% similar to 16. 24% NaCleqv. The fluid inclusions in fluorite associated with Zn-Pb mineralization are almost liquid-rich fluid, indicating fluid boiling is not obvious. During Zn-Pb mineralization stage, the ore-forming temperature drops to 240 similar to 160 degrees C and salinity shows a wide range from 0. 88% to 16. 58% NaCleqv, indicating the characteristic of low-medium temperature and low salinity of ore-forming fluid. We concluded that the W-Mo-Pb-Zn mineralization in Huangshaping deposit is related to the cooling and boiling of fluids from early high-temperature, high salinity to late low-temperature, low salinity.

Publication name

 ACTA PETROLOGICA SINICA Volume: 29 Issue: 12 Pages: 4232-4244 Published: 2013

Author(s)

 Huang Cheng; Li XiaoFeng; Wang LiFa; Liu FengPing

Corresponding author  

 HUANG Cheng
 hc2008_china@aliyun.com
 1. Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China
 2. Univ Chinese Acad Sci, Beijing 100049, Peoples R China

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