摘要
铜、金为东北非重要的矿产资源,成矿潜力巨大,其成矿过程与东非造山带努比亚地盾的演化历史密切相关。矿床类型以造山型矿床和火山块状硫化物(VMS)型矿床为主,斑岩型铜金矿床较少。其中,造山型以金矿床为主,主要赋存于韧-脆性剪切带的石英脉中,集中分布于埃及东部沙漠区、苏丹东北部、厄立特里亚西北-埃塞俄比亚北部、埃塞俄比亚西部地盾区及埃塞俄比亚南部地盾区5个区域;VMS型以铜金矿床为主,主要发育于新元古代火山岩中,集中分布于埃及东部沙漠区、苏丹东北部及厄立特里亚西北-埃塞俄比亚北部3个区域,VMS型矿床的氧化带具有较高的品位和较大的资源量。在总结东北非区域地质背景、构造演化和铜金矿床资源分布特征的基础上,系统地分析了东北非典型铜金矿床地质特征及赋存形式,以期为国内企业、事业单位在东北非开展铜、金勘查与开发等提供基础地质支撑。
Copper-gold deposits are the main types of mineral resources in Northeast Africa with great metallogenic potentials,and their metallogenic processes are closely related to the evolution history of Nubian Shield in the east African orogenic belt.Orogenic gold deposits and volcanogenic massive sulfides(VMS)copper-gold deposits are two main genetic types,while the porphyry copper-gold deposits are rare.Orogenic deposits,mainly gold in mineralization,are mostly related to the quartz veins in ductile-brittle shear structure,and they are distributed in 5 different regions.However,VMS deposits,mainly copper and gold in mineralization,are primarily related to the Neoproterozoic volcanic rocks,and they are distributed in 3 different regions.The oxide zone of VMS deposits exhibits copper-gold resources with relatively high tenor and large tonnage.Combined with regional geology,tectonic evolution and distribution characteristics of copper-gold resources in Northeast Africa,the geological characteristics and occurring states of copper-gold deposits are analyzed,which would provide critical clues for the copper-gold exploration or mining development in Northeast Africa for domestic mining enterprises and institutions.
作者
李福林
向文帅
王成刚
曾国平
吴发富
刘江涛
王建雄
李勇
LI Fulin;XIANG Wenshuai;WANG Chenggang;ZENG Guoping;WU Fafu;LIU Jiangtao;WANG Jianxiong;LI Yong(Wuhan Center,China Geological Survey(Central South China Innovation Center for Geosciences),Wuhan 430205,Hubei,China)
出处
《地质通报》
CAS
CSCD
北大核心
2022年第1期119-128,共10页
Geological Bulletin of China
基金
中国地质调查局项目《北部非洲大型铜金资源基地评价》(编号:DD20190443)
中国商务部对外援助项目《援摩洛哥十幅地球化学填图项目》(编号:〔2021〕28)、《援利比里亚矿产资源调查技术合作项目》(编号:〔2015〕20)。
关键词
造山型金矿床
VMS型铜金矿床
资源分布
矿产勘查工程
东北非
orogenic gold deposit
VMS copper-gold deposit
distribution of mineral resources
mineral exploration engineering
Northeast Africa
