Fluid characteristics and metallogenic age of Aktamu gold deposit,Xinjiang,China
Xinjiang Aktamu gold deposit is located in the western part of the Junggar Basin in Xinjiang,which is the southwest edge of the Hatu Mountain gold mineralization belt.The study of the geological characteristics,fluid and the age of mineralization in this area will help to understand the genesis and formation mechanism of the deposit in this area.In the study area,the Taskuala rock body is a high-potassium alkaline granite,and the zircon U-Pb age is(314.9±1.5)Ma.The granite intruded in the Late Carboniferous,and the mineralization is slightly later than magmatic activity.The inclusions in the quartz at the main-mineralization stage of the Aktamu gold mine are liquid-rich two-phase inclusions(Type I),gas-rich two-phase inclusions(Type Ⅱ),and CO2-containing three-phase inclusions(Type Ⅲ),with liquid-rich two-phase inclusions predominating.The mineralized fluids are characterized by low to medium temperatures(main peaks are concentrated in the range of 185-325℃,with an aver-age of 256℃)and low salinity(0.18%-12.87%,with an average of 5.21%).Hydrogen-oxygen isotope studies sug-gest that the fluids involved in mineralization are mainly mixed fluids of deep origin.The above research work indicates that the Aktamu gold deposit is a medium to low-temperature hydrothermal gold deposit,and the study of its characteristics can provide a theoretical basis for the subsequent geological exploration work and expand the results of the mineral search.
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