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.
作者
刘礼广
刘福海
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)
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).
关键词
银金矿床
找矿标志
矿床成因
控矿因素
内蒙古
silver-gold deposit
prospecting indicator
deposit genesis
ore-controlling factor
Inner Mongolia
