ANALYSIS ON THE METALLOGENIC FIUID OF THE LUOTUOLAZI GOLD DEPOSTT IN HEIL ONGJIANG PROVINCE

The Luotuolazi gold deposit, located in the south of the Indosinian Wandashan fold belt, forms one of the significant gold metallogenic regions in Heilongjiang Province. The ores, classified as quartz vein type, occur in vein groups, controlled by the NE-trending Qilixin com press-shearing fault. The sulfides in the ores are dominated by pyrite and chalcopyrite. The quartz fluid inclusions are in gas-liquid two-phase and CO₂-bearing three-phase. The salinity of the fluid is low, from 4.0% to 6.8% (NaCl eq), averagely 6.6%. The ore-forming temperature is between 180 and 289℃, mainly in 200-270℃. The metallogenic pressure ranges from 40 to 240 MPa. concentrated in 60-120 MPa. The depth is then calculated to be 4.9-12.8 km. mainly 6.5-9.0 km. The Luotuolazi gold deposit is geochemically similar to the orogenic type, assigned to mesothermal orogenic gold deposit, with the dynamic background of intracontinental collision orogeny. The orebody is most likely extends to the deep, with a great exploration potential.