利比里亚金矿成矿地质背景与资源潜力  

Geological background and resource potential of gold mineralization in Liberia

作　　者：陈冲[1] 陈开旭[1] 严永祥 张继纯 徐景银 郑国权 CHEN Chong;CHEN Kaixu;YAN Yongxiang;ZHANG Jichun;XU Jingyin;ZHENG Guoquan(Wuhan Center,China Geological Survey,Wuhan 430205,Hubei,China;Geophysical Exploration Brigade of Hubei Geological Bureau,Wuhan 430056,Hubei,China)

机构地区：[1]中国地质调查局武汉地质调查中心,湖北武汉430205 [2]湖北省地质局地球物理勘探大队,湖北武汉430056

出　　处：《地质通报》2022年第1期72-84,共13页Geological Bulletin of China

基　　金：商务部援外技术合作项目《援利比里亚矿产资源调查项目》(编号:IGGEF2015042)。

摘　　要：西非地区比里姆(Birimian)岩系经历了伊本尼(Eburnean)造山运动,成为全球金矿商业投资的主要含矿岩系之一,该岩系在利比里亚覆盖约36%国土面积。通过对西非尤其是利比里亚地质背景分析,初步建立了利比里亚区域地质构造格架,梳理出比里姆岩系中33处重要意义的岩金矿点,其分布与比里姆绿岩带、区域剪切构造带密切相关。综合全国266处金矿化点及密切相关的Au、Ag、Hg、Cu元素异常,在利比里亚划定了比-克波、杜格贝、塞斯托斯、鲍特洛-祖亚-皮菲吉、邦-托托-宁巴、杜贝、朱亚松、托迪8个金成矿带,显示出良好的成矿潜力,并对不同开发程度下矿化前景区进一步找矿方面提出了初步建议。In the West African,the Birimian series covering about 36%of Liberia underwent the complex Eburnean orogenic movement,and belongs to one of the main Au-bearing rocks on which the global gold diggers invest.Based on the analysis of the geological background in the West Africa and especially Liberia,a new division of geological units in Liberia was established,and 33 important gold occurrences in the Birimian series were sorted out.The distribution of these gold occurrences is closely related to the metamorphosed volcano-sedimentary rocks(greenstone)of Birimian series and regional shear zone.Based on the comprehensive analysis of the 266 gold mineralized occurrences and geochemical anomalies of Au,Ag,Hg and Cu,eight favorable gold metallogenic belts were delineated in Liberia,namely Bea-Kpo,Dugbe,Cestos,Bautle-Zua-Pifgi,Bong-Toto-Nimba,Dube,Juazhon and Todi.These gold metallogenic belts show a good potential for gold mineralization,and some suggestions were put forward for the prospecting of some gold prospects.

关 键 词：马恩-莱奥地盾 利比里亚 金矿 成矿地质背景 资源潜力 矿产勘查工程 

分 类 号：P618.51[天文地球—矿床学]