易门狮子山铜矿床地质特征及钴、银赋存规律研究

【作者】 姬丽娜；

【导师】 韩润生；

【作者基本信息】 昆明理工大学 ， 矿产普查与勘探， 2009， 硕士

【摘要】 狮子山铜矿床位于昆阳裂谷内的易门铜矿田的东矿带上,是典型的沉积-改造型中等规模的铜矿床。论文以狮子山矿床的典型矿体为重点研究对象,针对矿床中的矿物组合、钴、银的赋存状态及富集规律研究的薄弱环节,在系统野外工作的基础上,运用光学显微镜、扫描电镜能谱分析、物相分析、ICP-MS分析等对铜矿石开展研究,分析了矿石组成,总结了矿石结构构造和围岩蚀变特征,划分了成矿期次及矿物生成顺序,阐明成矿期矿物共生组合,揭示了钴、银的赋存状态及其富集规律。矿床中主要的赋矿地层有因民组、落雪组和鹅头厂组底部,地层岩性构造控矿明显；矿体主要呈层状、似层状、不规则脉状、透镜状等。根据矿体、产状与围岩特征,将矿体分为五种类型：板岩型矿体、碳酸盐岩型矿体、砂岩型矿体、“稀矿山式”铜铁矿体、基性岩型铜铁矿(化)体。矿床中矿石矿物主要有：黄铜矿、斑铜矿、黄铁矿,脉石矿物主要有：白云石、石英、方解石；钻、银的载体矿物主要是黄铜矿、斑铜矿、黄铁矿和辉砷钴矿。钴的赋存状态主要是独立矿物(钴黄铁矿与辉砷钴矿)和类质同像两种；银的赋存状态主要是类质同像、亚显微银和分散态,其次是自然银形式赋存于载体矿物中；在黄铜矿、黄铁矿与斑铜矿中主要呈类质同像存在。钴的富集规律是：从落雪组→因民组→鹅头厂组,钴含量依次降低；五种类型矿体中,从碳酸盐岩型矿体→“稀矿山式”铜铁矿体→砂岩型矿体→基性岩型铜铁矿化(体)→板岩型矿体,钴含量依次降低；从7中段→15中段→13中段,钴含量依次降低。银的赋存规律是：从落雪组→因民组→鹅头厂组,银含量降低；五种类型矿体中,从碳酸盐岩型矿体→“稀矿山式”铜铁矿体→砂岩型矿体→基性岩型铜铁矿化(体)→板岩型矿体,银含量降低；从7中段→13中段→15中段,银含量依次降低。在横向上,矿体中钴、银含量在13中段矿体两端高,中心低,矿体中钴、银含量在15中段矿体两端低,中心高；垂向上,矿体两端是由高变低,矿体中心是由低变高。矿石中钻、银的赋存状态决定了在当前技术条件下只有在选矿中富集、在冶炼中回收,同时为矿床经济评价、钴、银组分综合利用及合理回收提供了重要依据。更多还原

【Abstract】 Shizishan copper deposit locates in the Yimen copper ore field east metallogenic belt of the KunYang rift,it is the typical sedimentary reformation middle scale copper deposit. Typital orebody of Shizishan copper deposit is the important research object in the thesis,according to weaks links which the deposit mineral association and the occurrence state enrichment regularity of cobalt and silver, based on the system field work, it carring out the copper minerals using optical microscope,sem energy spectrum analysis,phase analysis,Icp-Ms analysis etc,and then it identified mineral species,summarized ore structure and wall rock alteration characteristics, identified of metallizing ph’aze and mineral generation sequence,illustrated every stage mineral assemblage,revealed Enrichment regularit and occurrence state of cobalt and silver.Shizishan copper deposit mainly host strata are Yin min formation,Luo xue formation,Ertouchang formation,strata lithology ore-controlling is obvious,orebody mainly are layered,atratiform-like,irregular vein etc,according to orebody,occurrence and wall rock characteristics,the orebodies are divided into five types:slate type orebody,carbonate type orebody,sand stone type orebody,dilute mine delafossite orebody,basic rock delafossite mineralized body.The ore minerals mainly are chalcopyrite,borite and pyrite,the gangue minerals mainly are dolomite,quartz and calcite. the silver and cobalt carrier minerals are minly chalcopyrite and bornite and pyrite and cobaltite in the copper deposit,the cobalt occurrence state mainly independent minerals and isomorphism,silver occurrence state mainly native silver,isomorphism,sub-micro-morphology silver and dispersed state.in chalcopyrite and pyrite and bornite,silover form of isomorphism.The enrichment regularity of cobalt:in the formation, the content decrease in Luo xue formation→Yin min formation→Er touchang formation;the content decrease in carbonate type orebody→dilute mine delafossite orebody→sand stone type orebody→alkali gabbro mineralized body→slate type orebody;the content decrease 7middle segments→15middle segments→13middle segments; The enrichment regularity of silver:the content decrease in Luo xue formation→Yin min formation→Er touchang formation, the content decrease in carbonate type orebody→dilute mine delafossite orebody→sand stone type orebody→alkali gabbro mineralized body→slate type orebody;the content decrease 7middle segments→13middle segments→15middle segments;in the transverse,cobalt and silver content high in the two ends of 13formation orebody and the low in the intermediate, cobalt and silver content low in the two ends of 15formation orebody and the high in the intermediate;in the vertical, the content decrease in the two ends of orebody, the content increase in the intermediate of orebody.The occurrence state of the cobalt and silver determined that cobalt and silver are enrichmented in the mineral processing and recoveried in the smelting in the current technical condition,and then it provide important evidence for economic evaluation of deposit,components comprehensive utilization of cobalt and silver and rational recovery.更多还原