摘要
塞拉利昂位于非洲大陆西北部的西非克拉通内,地层较简单,绝大部分属古老的花岗岩地层,太古宙基底占80%以上,盖层占20%左右;地质构造相对较简单,无大的构造带,仅在局部形成次级构造带。塞拉利昂成矿地质条件优越,主要矿产有金刚石、金、铁等。塞拉利昂金矿床主要分布在太古代及早元古代地层和晚元古代地层中,产出于绿岩带内。塞拉利昂的砂金矿主要分布在中部的苏拉山地区、坎格瑞山地区,东部的尼密尼山地区的科马洪(Komahun)一带,北部的卡马奎地区。且在垂向上具有一定的分层现象,由地表向下具有富集趋势。原生金矿主要分布在塞拉利昂中部的苏拉(Sula)山、坎格瑞(Kangari)山及东部的尼密尼(Nimini)山地区。
Sierra Leone is located in the West African craton in the northwest of the African continent.The strata are relatively simple,most of them belong to ancient granite strata.The Archean basement accounts for more than 80%and the caprock accounts for about 20%.The geological structure is relatively simple,there is no large structural belt,and only secondary structural belt is formed locally.The metallogenic geological conditions of Sierra Leone are superior,and the main minerals are diamond,gold,iron,etc.The gold deposits in Sierra Leone are mainly distributed in Archean Early Proterozoic strata and late Proterozoic strata,occurring in greenstone belts.The placer gold deposits in Sierra Leone are mainly distributed in the Sula mountain area and the kangre mountain area in the central part,the komahun area in the nimini mountain area in the East,and the kamaqui area in the north.There is a certain stratification phenomenon in the vertical direction,and there is a enrichment trend from the surface down.The primary gold deposits are mainly distributed in Sula mountain,kangari mountain in central Sierra Leone and nimini mountain area in the east of Sierra Leone.
作者
游文兵
邵拥军
YOU Wen-bing;SHAO Yong-jun(School of geoscience information and physics,Central South University,Changsha 410083,China;Sinotech Minerals Exploration Co.,Ltd,Beijing 100101,China)
出处
《世界有色金属》
2020年第21期107-108,共2页
World Nonferrous Metals
关键词
塞拉利昂
金矿
分布规律
地质特征
Sierra Leone
gold deposit
distribution law
geological characteristics
