易门铜厂矿区铜矿矿化类型及找矿思路

发布时间：2018-03-23 06:36

本文选题：矿化类型　切入点：矿床成因　出处：《昆明理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：易门铜厂矿区地处扬子陆块西南缘康滇地轴南段的南北向易门断裂与绿汁江断裂夹持的地块中,矿床产于中元古代易门断陷盆地内。铜厂矿床及其周围的一系列铜矿床(点),构成我国著名的铜矿成矿区之一—易门铜矿带。铜厂矿床是易门铜矿带中的Cu品位较低的大型矿床,也是易门铜矿带东矿带中的一个代表性矿床。本文通过详细的矿床地质调查研究,在查明矿区铜矿(化)体的相互穿切关系及其时空分布关系的基础上,对不同类型矿石样品开展系统的C、O、S、Pb同位素地球化学分析测试研究。结果表明：矿区存在两种不同的铜矿化类型,其中,沉积-成岩型(铜厂式)铜矿,层控特征明显,主要产于落雪组二段白云岩中,主要矿石矿物为斑铜矿,具“同生”矿床地质特征；热液脉状型(大尖山式)铜矿穿层明显,形成于晋宁-澄江运动的造山期,可见于因民组,落雪组,鹅头厂组中,主要由黄铜矿—方解石(重晶石)脉组成,部分地段为黄铜矿—石英脉,具“后生”矿床特征；同位素组成指示,铜厂式层状铜矿体的成矿物质源自矿区含矿层及附近碳酸盐地层,属典型的沉积-成岩成因;大尖山式脉状矿成矿流体与幔源或深部岩浆活动有关,为壳-幔混合流体,成矿流体为中低温、中低盐度的热液；矿床形成的压力与深度都较小,为低压环境下的浅成矿,属典型的岩浆热液成因。本文指出,易门铜厂矿床为沉积-成岩+深源热液叠加成因的多因复成矿床,建立了该矿床的成矿模式。在空间上,两种矿化类型组成不同的矿化组合类型区,沉积-成岩型矿化区主要分布在15线以南区段及16-15线西部层状矿体延深区。热液脉状矿化区主要分布于大尖山-铜厂30号勘探线区段及小马山矿段。沉积-成岩型矿化与热液脉状矿化显著叠加组合区主要位于30-15号勘探线。三种矿化组合类型区成矿特征和矿体产出特点完全不同。根据成矿规律的认识,本文提出“层状矿-层脉叠加矿-脉状矿三位一体”的找矿新思路,并按矿化组合类型区的不同,针对性地提出综合找矿工程部署的总体原则,作为实现“贫中找富”的目标基本思路。
[Abstract]:The Yimen Tongchang mining area is located in the block of the southern section of the Kangdian axis in the southwestern margin of the Yangtze block, which is gripped by the north-south Yimen fault and the Luzhujiang fault. The deposit occurs in the middle Proterozoic Yimen fault basin. The Tongchang deposit and a series of copper deposits around it form one of the famous copper ore deposits in China, the Yimen copper ore belt. Tongchang deposit is the copper grade in the Yimen copper ore belt. Lower large deposits, It is also a representative deposit in the east ore belt of Yimen Copper Mine Belt. Based on the detailed geological investigation and study of ore deposit, the interpenetrating shear relation of copper ore body and its spatial and temporal distribution are investigated in this paper. The isotopic geochemical analysis and study of different types of ore samples have been carried out systematically. The results show that there are two different types of copper deposits in the ore area, among which the sedimentary diagenetic type (Tongchang type) copper deposit has obvious stratabound characteristics. Mainly occurring in the dolomite of the second member of the Luoxue formation, the main ore mineral is the placenta copper deposit, which has the geological characteristics of the "syngenic" deposit, and the hydrothermal vein type (Daganshan type) copper deposit is obvious in the ore-forming period of the Jinning Chengjiang movement, which can be seen in the Yinmin formation. The Luoxue formation and the Yetouchang formation are mainly composed of chalcopyrite calcite (barite) veins, some of which are chalcopyrite quartz veins with the characteristics of "epigenetic" deposits, indicating isotopic composition, The ore-forming material of the Tongchang type layered copper deposit originates from the ore-bearing strata of the ore area and the carbonate strata nearby, and belongs to the typical sedimental-diagenetic genesis, and the ore-forming fluid of the Dadianshan type vein type is related to the mantle-derived or deep magmatic activity and belongs to the crust-mantle mixed fluid. The ore-forming fluid is hydrothermal with medium and low temperature and low salinity, and the formation pressure and depth of the deposit are small, which is a typical magmatic hydrothermal origin in the low pressure environment. The Yimen Tongchang deposit is a sedimentary diagenetic deep-source hydrothermal superimposed polygenetic complex deposit. The metallogenic model of the deposit has been established. In space, the two types of mineralization consist of different mineralization assemblage types. The sedimental-diagenetic mineralization area is mainly distributed in the south section of Line 15 and the extended area of stratiform orebody in the west of Line 16-15. The hydrothermal vein mineralization area is mainly distributed in the section of exploration line 30 of Dajianshan-Tongchang Mine and the Xiaomashan Mine. Type type mineralization and hydrothermal vein mineralization are mainly located in the prospecting line No. 30-15. The metallogenic characteristics and orebody production characteristics of the three types of mineralized assemblages are completely different. In this paper, a new idea of "stratified ore-vein superposition ore-vein ore-vein ore trinity" is put forward, and the general principles of comprehensive prospecting engineering deployment are put forward according to the different types of mineralization assemblages. As the basic idea of realizing the goal of "looking for the rich among the poor".
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.41

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