黑龙江省骆驼砬子金矿成矿流体分析

ANALYSIS ON THE METALLOGENIC FLUID OF THE LUOTUOLAZI GOLD DEPOSIT IN HEILONGJIANG PROVINCE

骆驼砬子金矿位于完达山印支期褶皱带南部,是黑龙江省主要的金矿成矿区（带）之一.矿区内金矿以矿脉群形式产出.金矿脉受压扭性的七里信NE向断裂控制,矿体分布于七里信断裂次级NNE向断裂系中.矿石自然类型为石英脉型,矿石中硫化物以黄铁矿、黄铜矿为主.石英流体包裹体有气液两相、含CO2三相2种类型.流体盐度低,介于4.0％～6.8％（NaCl当量）,平均6.6％.成矿温度在180～390℃之间,主要在200～270℃.成矿压力在40～240 MPa之间,集中在60～120 MPa之间.依据深度与压力之间的关系式计算成矿深度在4.9～12.8 km之间,主要在6.5～9.0 km.骆驼砬子金矿地质地球化学特征与全球造山型金矿类似,为中成造山型金矿,陆内碰撞造山是其成矿动力学背景.与同类金矿类似,该矿体向深部可能有较大的延伸,其深部仍有很大的找矿潜力.

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 compress-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.