【摘要】 通过对不同阶段流体包裹体岩相学、显微测温学和包裹体激光拉曼光谱等的分析,研究其成矿流体性质和演化,并探讨矿床成因类型,结果表明:流体包裹体主要为气液两相包裹体,另有少量含CO2三相和纯CO2包裹体。包裹体气相成分主要为N2,CH4,CO2和H2O。主成矿期流体包裹体的均一温度介于156℃~365℃(平均267℃),流体盐度介于5.4%~6.3%(平均5.9%),流体密度为0.82 g/cm3~0.87 g/cm3(平均0.86 g/cm3);成矿晚期辉锑矿阶段流体包裹体的均一温度介于164℃~224℃(平均182℃),流体盐度介于7.2%~8.3%(平均7.7%),流体密度为0.93 g/cm3~0.96 g/cm3(平均0.95g/cm3);成矿后期石英大脉阶段流体包裹体的均一温度介于129℃~253℃(平均184℃),流体盐度介于5.4%~11.2%(平均7.6%),流体密度为0.88 g/cm3~0.98 g/cm3(平均0.95 g/cm3)。从主成矿期、成矿晚期到成矿后期,流体包裹体均一温度降低、盐度增加、密度增大,表明随着流体的演化,变质流体逐渐减少,而地层建造水增加。主成矿期流体压力介于62 MPa~73 MPa(平均65 MPa),对应的成矿深度为6.3 km~6.9 km(平均6.5 km)。砂宝斯金矿床的地质-地球化学特征与世界造山型金矿类似,应属造山型,其形成于蒙古-中朝板块与西伯利亚板块之间的陆-陆碰撞造山环境。更多还原

【Abstract】 The host rock of the Shabaosi gold deposit was mainly composed of sandstone and siltstone of the Ershierzhan Formation,Middle Jurassic,and the ore bodies occurred in the SN-trending brittle fault zone.Based on the study of the fluid inclusion,micro-thermometry and Laser Raman Spectrographic analyses,which came from the major mineralization phase,stibnite-forming phase and post-mineralization phase,respectively,the characteristics of ore-forming fluid,fluid evolution and the origin of the Shabaosi gold deposit,were discussed and systematically studied.The results showed that these inclusions consisted of mainly 2 phases of gas and liquid,with minor 3 phases of inclusions of gas,liquid and CO2 as well as pure CO2.Analysis showed that the compositions of liquid in the inclusions were N2,CH4,CO2 and H2O.The homogenization temperature,salinity and density of fluid inclusions for the major mineralization phase,ranged from 156 ℃ to 365 ℃(average 267 ℃),5.4% to 6.3%(average 5.9%),and 0.82 g/cm3 to 0.87 g/cm3(average 0.86 g/cm3),respectively.The homogenization temperature,salinity and density of fluid inclusions for the stibnite-forming phase of late mineralization,ranged from 164 ℃ to 224 ℃(average 182 ℃), 7.2% to 8.3%(average 7.7%),and 0.93 g/cm3 to 0.96 g/cm3(average 0.95 g/cm3),respectively.The homogenization temperature,salinity and density of fluid inclusions for the post-mineralization phase,ranged from 129 ℃ to 253 ℃(average 184 ℃,5.4% to 11.2%(average 7.6%),and 0.88 g/cm3 to 0.98 g/cm3(average 0.95 g/cm3),respectively.From the major mineralization to late mineralization,the homogenization temperature of fluid inclusions decreased,the salinity of fluid and the density of fluid increased,indicating that the ore-forming fluid of early phase was dominated by metamorphic fluid,and the fluids of late and post-mineralization stage was stratum formation water.The ore-forming pressure of major mineralization phase is 62 MPa~73 MPa with average of 65 MPa,corresponding to depth ranging from 6.3 km to 6.9 km(average 6.5 km).The geological and geochemical features of the Shabaosi gold deposit were similar to those of orogenic gold deposits in the world,and could be assigned to the orogenic type.The formation of deposit may be related to Mesozoic collisional orogeny between the Siberia and Mongolia-Sinokorea continents.更多还原