Occurrence state of gold and characteristics of fluid inclusions in Jinying Gold Deposit,Baishan City,southeast Jilin Province
Jinying Gold Deposit is situated on the eastern section of the northern margin of China-Korea quasi-platform.It lies on the depression side of the contact interface between Tieling-Jingyu uplift and Taizihe-Hunjiang depression fold fault bundle.Through field investigation,mineralogical analysis,electron probe,and fluid inclusion testing,it has been determined that the deposit's mineral composition is uncomplicated and consists of siliceous struc-tural breccia-type ore.The gold mineral species include native gold,silver-bearing native gold,and electrum,with quartz being the primary host for gold which occurs mainly as fissure gold,followed by intergranular and encased gold.The inclusions within quartz consist primarily of gas-liquid two-phase fluids,which take on a predominantly oval,diamond and irregular form.Ore formation occurs at temperatures ranging from 139.6 ℃ to 253.1 ℃,with salinity levels between 1.74％and 4.65％,densities ranging from 0.79 g/cm3 to 0.94 g/cm3,pressures between 33.6 MPa and 65.6 MPa,and depths of formation spanning from 1.2 km to 2.4 km;these characteristics classify the fluid as medium-low tempera-ture,low salinity,and low density.
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