赞比亚铜带省谦比希铜矿床东南矿区钼矿化特征  

Characteristics of molybdenum mineralization in the southeast orebody of Chambishi copper deposit in Copperbelt Province of Zambia

作　　者：方科 胡乔帆 李明君 邓贵安 覃鹏 黄学强 FANG Ke;HU Qiaofan;LI Mingjun;DENG Gui'an;QIN Peng;HUANG Xueqiang(China Nonferrous Metals(Guilin)Geology and Mining Co.,Ltd.,Guilin 541004,Guangxi,China)

机构地区：[1]中国有色桂林矿产地质研究院有限公司,广西桂林541004

出　　处：《矿产与地质》2019年第6期987-994,共8页Mineral Resources and Geology

基　　金：广西自然科学基金项目(任务书编号:2017GXNSFBA198203)资助。

摘　　要：赞比亚谦比希铜矿床为典型砂页岩沉积-变质型铜矿床。近年生产探矿过程,发现局部含有钼矿化叠加,为该地区的深入找矿与扩大远景提供了新的方向。通过对东南矿区钼矿化进行系统的地质调查,显示其矿化特征:东南矿区钼矿化位于基底隆起部位下罗恩亚群内,呈脉体切穿并交代新元古界加丹加超群的下罗安亚群底部石英岩、长石石英砂岩或充填于矿化板岩(LOS)内滑动虚脱部位。根据其分布切穿关系,矿区出现的脉可分四组,除A组脉形成的剪切带中未见有矿化,其余三组脉体中均出现有钼矿化。脉体厚度为0.1~1.5m,钼矿化范围较局限,连续性不好。矿石结构主要为自形-半自形、他形粒状、鳞片状结构。矿石构造呈细脉状或浸染状,局部形成稠密浸染状、菊花状或团块状。矿石矿物主要为辉钼矿和斑铜矿,次为黄铜矿、黄铁矿。脉石矿物主要为石英、硬石膏、方解石、钾长石。围岩蚀变表现为硅化、云英岩化、硬石膏化、碳酸岩化、钾化、绢云母化、绿泥石化。通过与该区域附近层状铜矿化及同类型矿床对比研究,认为谦比希东南矿区脉状钼矿化,应为后期热液叠加改造成因。卢弗里安构造-热事件的晚期,受造山运动影响,早期结晶基底及加丹加超群内成矿元素重新活化-迁移-富集,形成热液脉型叠加于早期层状铜矿之上,该矿化过程具有多阶段性。Chambishi copper deposit in Zambia is a typical sand-shale sedimentary-metamorphic copper deposit.In recent years,molybdenum mineralization superposition has been found in the prospecting process,which provides a new direction for the further prospecting and expanding mineral perstective in the area.Through systematic geological survey in the southeast mining area,the mineralization characteristics are listed as follows.The molybdenum mineralization in the southeast mining area which belongs to Lower Roan Formation of Neoproterozoic Katangan Supergroup is located at a uplift of the basement,and appears as veins cutting through and replacing quartz rock,feldspar quartz sandstone or filling in the sliding collapse of mineralized slate(LOS).According to the distribution and cutting relationship,the veins in the mining area can be divided into four groups.Except for the absence of Mo mineralization of a group of veins in the shear bands,Mo mineralization occurs in the other three groups of veins.The thickness of veins varies from 0.1 to 1.5 m.The range of molybdenum mineralization is limited,and the continuity is not good.The main textures of molybdenum ores include automorphic-hypidiomorphic,allotriomorphic granular and pelitic textures.The ore structures are veined or disseminated structures,locally there are dense disseminated,chrysanthemum or nodular structures.The ore minerals are mainly molybdenite and porphyrite,and the secondary minerals are chalcopyrite and pyrite.Gangue minerals are mainly quartz,anhydrite,calcite and potash feldspar.The alteration types of surrounding rock are characterized by silicification,greisenization,anhydritization,carbonatization,potassiumization,sericitization,and chloritization.Through the comparative study with the stratified copper mineralization and the deposits of same type in the vicinity of this area,it is considered that the molybdenum mineralization in the southeast orebody area of Chambishi Mine should be the later hydrothermal superposition transformation type genesis.A

关 键 词：谦比希铜矿床 钼矿化 地质特征 赞比亚 

分 类 号：P618.41[天文地球—矿床学]