坦桑尼亚马拉省Majimoto金矿区成矿地质特征及找矿远景浅析  

Metallogenic geological characteristics and ore prospecting of Majimoto Gold Deposit in Mara,Tanzania

作　　者：张耀[1] 罗镔烽 公斌[1] 王星明[1] ZHANG Yao LUO Binfeng GONG Bin WANG Xingming(No. 117 Geological Team, Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Guiy- ang 550018, China)

机构地区：[1]贵州省地质矿产勘查开发局117地质大队,贵州贵阳550018

出　　处：《贵州科学》2017年第4期56-61,共6页Guizhou Science

摘　　要：坦桑尼亚维多利亚湖绿岩带是世界上有名的金矿带,带内分布有较多大型金矿床,Majimoto金矿区就位于维多利亚湖东部含金绿岩带内。对该金矿区成矿地质特征进行了分析,显示其矿床类型为断裂蚀变带石英脉型金矿,矿体主要集中在矿区中、东部,受北东东向、北西西向和近南北向断裂控制,矿石类型以石英脉型和蚀变岩型金矿石为主,容矿岩石为尼安萨群镁铁质、长英质火山岩,而围岩的硅化、黄(磁黄)铁矿化、断裂蚀变带内不规则黄铁矿和石英的出现等则是该金矿区明显的找矿标志。Lake Victoria Greenstone Belt in Tanzania is one of the world＇s most famous gold belts with many large gold deposits in the area,including Majimoto Gold Deposit.We analyzed the metallogenic geological characteristics of Majimoto Gold Deposit,and discovered that the deposit was the structural altered-rock quartz vein type. The ore bodies concentrated in the middle and east area of the deposit,being controlled by NEE,NWW and SN trending fracture zones.The dominant ores were quartz veins and altered-rocks,and the ore-bearing rocks were mafic and felsic volcanic rocks of Nyanzian group.The silicification,（ magnetic） oyritization of the surrounding rock,and the emergence of irregular pyrite and quartz in fracture-alteration zones are obvious prospecting criteria in the deposit.

关 键 词：坦桑尼亚 维多利亚湖含金绿岩带 Majimoto金矿区 地质特征 找矿标志 

分 类 号：P618.51[天文地球—矿床学]