安西县寒山剪切带构造蚀变岩型金矿床地质特征  

GEOLOGICAL CHARACTERISTICS OF TECTONOALTERED ROCK-TYPE GOLD DEPOSIT OCCURED IN HANSHAN SHEAR ZONE IN ANXI COUNTY

作　　者：杨兴吉 

机构地区：[1]甘肃地勘局酒泉地质矿产调查队

出　　处：《甘肃地质学报》1999年第1期42-48,共7页Acta Geologica Gansu

摘　　要：寒山金矿床是甘肃地勘局酒泉地质矿产调查队于１９９５年检查１∶２０万重砂异常时发现的，是北祁连山地区新发现的一个大型韧脆性剪切带型构造蚀变岩型金矿床。成矿主岩为奥陶系安山质、英安质岩石。矿化蚀变以强硅化、绢云母化为特征。成矿作用分为热液期和表生期，热液期包括绢云母—石英阶段、黄铁矿—金矿化阶段、石英—多金属金矿化阶段、石英—碳酸盐化（方解石）４个成矿阶段。Hanshan gold deposit was found during 1∶200,000 scale placer prospecting in 1995.It is a newly found large-scale tectonoaltered rock type gold deposit occured in ductile-brittle shear zone in Northern Qilian mountain area.Ore-forming rocks are Ordovician andesitic and dacitic rocks.Mineralization-related alteration mainly are intensive silication and sericitization.Mineralizing process consists of hydrothermal stage and supergene stage.Hydrothermal stage is subdivided into four substages such as sericite-quartz,pyrite-gold mineralization,quartz-polymetalmineralization and quartz-carbonation(calcite);and supergene stage is a stage during which sulphide is oxidized into sulfate and oxide.

关 键 词：剪切带 构造蚀变岩型 北祁连山 金矿床 地质特征 

分 类 号：P618.510.2[天文地球—矿床学] P542.2[天文地球—地质学]