材料期刊网

宋家沟金矿床位于胶莱盆地东北缘,牟平—即墨断裂带内,控矿构造为陡倾断裂和裂隙密集带,赋矿围岩为莱阳群的灰白色砾岩,共出露4个矿体. 对区内主成矿阶段石英中的流体包裹体进行了岩相学、显微测温及单个包裹体成分激光拉曼光谱分析. 研究表明,矿石中的包裹体主要有纯CO2包裹体、气液二相包裹体和含CO2三相包裹体3种类型;矿石中的包裹体普遍富含CO2 ,成矿流体为CO2 -NaCl -H2 O 体系,成矿流体具有低盐度(5.0 %~14.42 %)、低密度(0.64 ~0.96 g/cm3 )的特点. 主成矿温度集中在220~240 ℃,成矿压力范围为40~62 MPa,对应的成矿深度为5 .01~6 .34 km. 结合前人研究的流体包裹体氢氧同位素分析认为,宋家沟金矿床的成矿流体以幔源流体为主,后期有少量的岩浆流体参与. 确定其矿床成因类型为受陡倾断裂和裂隙密集带联合控制的中温热液脉型金矿床.

Songjiagou Gold Deposit is located in in Muping-Jimo faults,northeast of Jiaolai Basin.The ore-con-trolling structure is steeply inclined fracture and fissure-intensive belt,the surrounding rocks are pale conglomerates with 4 outcrop orebodies.Petrographic,microthermometric and laser Raman microspectroscopic studies on fluid inclu-sions in quartz of main mineralization stages of Songjiagou Gold Deposit are carried out .The results show that there are three types of fluid inclusions:pure CO2 single-phase fluid inclusions,aqueous two-phrase fluid inclusions and CO2 -bearing fluid inclusions.CO2 are widespread in the fluid inclusions in ores.The fluids of main mineralization stages should be a CO2 -NaCl-H2 O system; The ore-forming fluids are with low salinity (5.0 % to 14.42 %) and low density(0.64 g/cm3 to 0.96 g/cm3 ); Mineralization temperature ranges between 220 ℃ and 240 ℃,mineralization pressure ranges from 40 MPa to 62 MPa,while mineralization depth ranges from 5.01 km to 6.34 km.The paper, based on hydrogen and oxygen isotopic analysis of fluid inclusions,thinks that Songjiagou gold ore-forming fluids de-rive mainly from deep mantle fluids,and later accompanied by a small amount of magmatic fluids.The genesis of the deposit is determined as a mesothermal vein-type gold deposit controlled by steeply inclined faults and fissure-intensive belts.