内蒙古翁牛特旗南湾子银金矿床地质特征  

Geological characteristics of Nanwanzi silver-gold deposit in Wengniute Qi,Inner Mongolia

作　　者：刘礼广 刘福海[1,2] 李和禄 吕彧 张慧龙 王丽萱 LIU Li-guang;LIU Fu-hai;LI He-lu;LYU Yu;ZHANG Hui-long;WANG Li-xuan(Liaoning No.6 Geological Brigade Co.,Ltd.,Dalian 116200,Liaoning Province,China;Liaoning Geological Offshore Engineering Survey Institute Co.,Ltd.,Dalian 116200,Liaoning Province,China)

机构地区：[1]辽宁省第六地质大队有限责任公司,辽宁大连116200 [2]辽宁地质海上工程勘察院有限责任公司,辽宁大连116200

出　　处：《地质与资源》2025年第1期44-51,共8页Geology and Resources

基　　金：中国地质调查局项目“东北亚欧洲国际合作地质调查”(DD20221806).

摘　　要：通过对内蒙古南湾子银金矿床的野外地质调查,发现4条银金矿体,16条断层及断裂破碎带.结合室内样品测试结果和综合资料研究,从矿区地质构造、矿床相关的岩石学、矿物学等方面入手,深入研究该银金矿的矿床地质特征,探索其成因与找矿标志.南湾子银金矿主要赋存于额里图组沉凝灰角砾岩、含角砾凝灰岩及喷溢相流纹岩中,矿体主要受F1、F2、F12、F13断裂控制.矿石类型为铁锰质石英脉型,主要金属矿物为软锰矿、硬锰矿、黄铁矿、针铁矿、纤铁矿及黝铜矿.矿石结构主要为半自形—他形粒状结构.矿石构造以稀疏浸染状构造、块状构造为主.矿体呈豆荚状扁豆体、小透镜状、豆状、薄层状赋存在地层中.研究认为金和银不存在明显伴生关系,矿床成因类型属中低温热液蚀变型.含铁锰质石英脉是直接找矿标志.By field geological survey,4 silver-gold orebodies and 16 faults or fracture zones are found in the Nanwanzi silver-gold deposit in Inner Mongolia.Combined with laboratory sample testing results and comprehensive data,the geological characteristics,genesis and prospecting indicators of the silver-gold deposit are studied on the basis of geological structures of the orefield,and related petrology and mineralogy of the deposit.The Nanwanzi silver-gold deposit is occurred mainly in the tuffite breccia,breccia-bearing tuff and effusive rhyolite of Elitu Formation,and the orebody is mainly controlled by F1,F2,F12 and F13 faults.The orebody is of ferromanganic quartz vein type,with metal minerals of pyrolusite,psilomelane,pyrite,goethite,lepidocrocite and tetrahedrite.The ores are in hypidiomorphic-allotriomorphic granular texture,dominated by sparse disseminated structure and massive structure.The orebodies are in podiform lenticle,lenticular,pisolitic and thin-bedded shapes.The study shows that there is no obvious associating relationship between gold and silver.The deposit genetically belongs to meso-epithermal alteration type.The ferromanganic quartz vein is the direct prospecting indicator.

关 键 词：银金矿床 找矿标志 矿床成因 控矿因素 内蒙古 

分 类 号：P618.5[天文地球—矿床学]