刚果（金）KIMPE铜钴矿床地质特征及成因探讨

发布时间：2018-05-20 04:00

本文选题：铜钴矿床 + 地质特征　；参考：《成都理工大学》2017年硕士论文

【摘要】：本文依托四川地矿局四0二地质队“刚果(金)加丹加省KIMPE铜钴矿床地质详查”项目为支撑,在深入总结与分析大量前人已有资料的基础上,对该矿床的成矿地质特征进行了详细研究。通过对与成矿密切相关的常微量元素、石英矿物包裹体、硫同位素、硅酸盐氧同位素及氢氧同位素的特征进行分析与对比,探讨了该矿床成因,取得了如下的成果和认识:(1)KIMPE铜钴矿床位于加丹加弧形成矿带上,大地构造位置处于卢菲莲(Lufilian)弧形构造带外部褶皱推覆带东部。(2)矿体主要赋存于罗安群矿山组中段(R2.2)砂质白云岩中及构造角砾岩中,少量赋存于顶底板碳质板岩裂隙中。矿区主要构造为KIMPE断裂,控制了矿床的空间定位与该条铜钴矿带分布。铜钴矿带的内部结构均由砂质白云岩、角砾岩及碳质板岩组成,围岩蚀变以硅化、白云石化与铜钴矿化关系最密切。(3)铜钴矿体的矿石矿物主要为孔雀石、水钴矿、斑铜矿、辉铜矿、黄铜矿、硫钴矿、硫铜钴矿、黄铁矿等,脉石矿物以石英、白云石、滑石、绢云母等为主。矿石以它形粒状结构、包含结构、粒状结构、交代溶蚀结构、分叉结构为主,以角砾状、浸染状、块状构造为主。矿石自然类型为以金属硫化物型为主,次为氧化型铜钴矿石,矿石工业类型属白云岩型铜钴矿石。根据成矿地质作用的先后关系,KIMPE铜钴矿床分为沉积阶段、热液改造阶段、表生富集阶段三个成矿阶段。(4)成矿作用以热液充填为主。罗安群为初始矿源层,形成于距今880Ma~750Ma年间。后期卢菲莲(Lufilian)运动期间的构造变质作用对矿床进行了热液改造,造成铜钴矿化的叠加和局部富集。当地充沛的降雨量、断层及其破碎带良好的透水性、适宜的温度以及巨大的时间跨度,使得矿床的次生氧化作用强烈。矿床成因类型属于与地层、断层关系密切的沉积-热液改造型铜钴矿床。上述成果和认识,对加丹加地区今后铜钴矿床的找矿和预测工作具有重要的指导意义,对其它地区铜钴矿的找矿与勘查工作也具有新的启迪作用。
[Abstract]:Based on the project of "detailed geological investigation of KIMPE copper and cobalt deposit in KIMPE" of Sichuan Geology and Mining Bureau, based on the deep summary and analysis of a large number of existing data, The metallogenic geological characteristics of the deposit are studied in detail. Through the analysis and comparison of the characteristics of trace elements, quartz mineral inclusions, sulfur isotopes, silicate oxygen isotopes and hydrogen and oxygen isotopes closely related to mineralization, the genesis of the deposit is discussed. The following results and understandings have been obtained: the 1 ~ (-1) KIMPE copper-cobalt deposit is located in the Katanga arc metallogenic belt. The geotectonic position is located in the eastern fold nappe belt of the Lufilian arc structural belt.) the orebody mainly occurs in the middle part of the Luan Group mine formation, in the sand dolomite and in the tectonic breccia, and in the fissure of the carbonaceous slate in the roof and floor. The main structure of the ore area is the KIMPE fault, which controls the spatial location of the deposit and the distribution of the copper and cobalt ore belt. The internal structure of copper-cobalt ore belt is composed of sandy dolomite, breccia and carbonaceous slate, and the alteration of surrounding rock is silicification. The ore minerals of dolomitization and copper-cobalt orebody are mainly malachite, water-cobalt ore and porphyry ore. Chalcopyrite, sulfur-cobalt ore, copper-cobalt ore, pyrite, etc., gangue minerals to quartz, dolomite, talc, sericite and so on. The ore is characterized by its granular structure, including structure, granular structure, metasomatic dissolution structure, bifurcation structure, breccia structure, disseminated structure and block structure. The natural ore type is mainly metal sulphide type, the second is oxidized copper-cobalt ore, and the ore industry type is dolomite copper-cobalt ore type. The KIMPE copper-cobalt deposit is divided into sedimentary stage, hydrothermal reformation stage and supergenetic enrichment stage according to the relation of ore-forming geological processes. The ore-forming process is mainly filled with hydrothermal solution. Luoan Group is an initial source bed formed during the 880Ma~750Ma period. The tectonic metamorphism during the late Lufilian movement resulted in the superposition and local enrichment of copper and cobalt mineralization. Local abundant rainfall, good permeability of fault and its broken zone, suitable temperature and huge time span make the secondary oxidation of ore deposit strong. The genetic type of the deposit belongs to the sedimentary-hydrothermal reformed copper-cobalt deposit which is closely related to strata and faults. The above results and understandings have important guiding significance for the prospecting and prediction of copper and cobalt deposits in Katanga area, and also have a new enlightening role for the prospecting and exploration of copper and cobalt deposits in other areas.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.2

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