摘要
刚果(金)东北部基伍地区产出有众多与G4期(1020-970Ma)S型花岗岩活动有关的稀有金属(钨、锡、铌、钽)矿,比西(Bisie)锡矿是典型矿床之一,该矿床为石英脉型锡矿,含锡石英脉(群)产出于N-S向延展的脆—韧性剪切带中,赋矿围岩为绿泥石化角闪片岩。矿石矿物以锡石为主,脉石矿物以石英、白云母为主,成矿阶段分为锡石-石英脉阶段和多金属硫化物阶段。矿床围岩蚀变可分为硅化、云英岩化、电气石化、绿泥石化等,云英岩化与锡成矿关系密切。比西锡矿的形成与G4期岩浆分馏作用有关,分馏作用促使Sn在熔体—热液体系中富集,该体系沿已存在的构造空间运移,锡石在氧化、中性和中低盐度的流体状态下沉淀。比西矿床赋矿围岩由蚀变角闪片岩组成,其抗风化性较强而多呈正地形,具有较好的地貌—岩性指示意义。矿区植被覆盖严重,通过航空磁法和土壤地球化学勘查对目标区进行地质构造解析,有较好的勘查效果。
There are many rare metal (tungsten,tin,niobium,tantalum) deposits related to the G4 (1020-970Ma) S-type granite in the Kivu region,the northeastern of the DR Congo.The Bisie tin deposit is a cassiterite-quartz vein-type deposit located in the N-S extending brittle-ductile shear zone,and the wall rock is chloritized amphibole schist.The tin minerals are cassiterite,and the gangue minerals are mainly quartz and muscovite.The mineralization stage is divided into cassiterite-quartz vein stage and polymetallic-sulfide stage.Silicification,greisenitzation,tourmalinization,and chloritization are the most common alterations,and greisenitzation is closely related to tin mineralization.The formation of Bisie tin ore is related to the magmatic fractionation in G4 granitic stage,which promotes the enrichment of Sn in the melt-hydrothermal system,which migrates along the existing tectonic fractures.Cassiterite were deposited in oxidized,neutral and low to medium salinity fluid.The wall rock of the Bisie deposit is altered amphibole schist,which has strong weathering resistance and is mostly positive topography,which has good geomorphological-lithological indications.Due to the disadvantages of lush vegetation,the geological structure and module of the concession area were surveyed by aerial magnetic survey and soil geochemical survey.
作者
王武名
盛涛
董少波
张法武
孙宁
WANG Wu-ming;SHENG Tao;DONG Shao-bo;ZHANG Fa-wu;SUN Ning(East China Mineral Exploration and Development Bureau for Non-ferrous Metals,Nanjing 210007,China;Zhejiang Huayou Cobalt Company Limited,Tongxiang 314500,China;China national Geological and Mining Corporation,Beijing,100029,China;Kunming Prospecting Design Institute Of China Nonferrous Metals Industry Co.Ltd,Kunming 650051,China;Sinotech Minerals Exploration Co.Ltd,Beijing 100012,China)
出处
《世界有色金属》
2022年第13期142-144,共3页
World Nonferrous Metals
关键词
刚果(金)
基巴拉带
比西锡矿
地质特征
勘查指示
DR Congo
Kibara Belt
Bisie Deposit
Geology Characteristics
Exploration Implication
作者简介
王武名,男,生于1977年,汉族,江西广昌人,地质学博士,高级工程师,主要从事矿产勘查及矿业咨询工作。
