Ore-forming fluid characteristics and genesis of Jinchiling gold deposit in Jiaodong

To clarify the characteristics of ore-forming fluid of the Jinchiling gold deposit, fluid inclusion study was carried out. The results show that the inclusions consist of three types: H 2O-CO 2, CO 2 and H 2O inclusions. The compositions of cation and anion ions in liquid and gas of the inclusions are mainly respectively Na +, K +, Ca 2+, Mg 2+; SO 4 2-, Cl -, F -; H 2O, CO 2 and CH 4. The homogenization temperature, salinity and density of the fluid inclusions for the mineralization change from 120°C to 362°C, 3.2% to 9.0% and 0.34 g/m 3 to 0.94 g/m 3, respectively, which show that these inclusions belong to middle-low temperature, low salinity and low density fluid. Combined with analyses of other researches, it is found that the ore-forming fluid following water-rock reaction is the mixture of multi-source fluid during its evolution.