云南维西大宝山铜多金属矿床望香台矿段矿石组合特征及成矿机制  

Ore assemblage characteristics and metallogenic mechanism of Wangxiangtai ore combination of Dabaoshan copper polymetallic deposit in Weixi,Yunnan Province

作　　者：付桥林 杜蔺 勾明明 蔡国盛 黄威虎 曾凡祥 罗勇军 娄经双 巩鑫 FU Qiaolin;DU Lin;GOU Mingming;CAI Guosheng;HUANG Weihu;ZENG Fanxiang;LUO Yongjun;LOU Jingshuang;GONG Xin(Geological and Mineral Exploration Institute,Guizhou Bureau of Geological exploration for Non-ferrous Metals and Nuclear Industry,Guiyang 550005,Guizhou,China;Guizhou Research Institute of Petroleum Exploration and Development,Guiyang 550004,Guizhou,China)

机构地区：[1]贵州省有色金属和核工业地质勘查局地质矿产勘查院,贵州贵阳550005 [2]贵州省油气勘查开发工程研究院,贵州贵阳550004

出　　处：《矿产勘查》2023年第5期718-729,共12页Mineral Exploration

基　　金：贵州省地质勘查基金项目“贵州省极贫乡(镇)地质资源调查”(PYZB2017-C112)资助。

摘　　要：云南维西大宝山铜多金属矿床位于青藏高原东南缘之三江成矿带昌都-兰坪-思茅地块中。矿床由南向北划分为望香台、滑石板、青龙山及二溪沟矿段。望香台矿段位于矿床东南侧,该矿段矿石种类繁多,矿石组合类型由地表向深部分别为孔雀石+蓝铜矿+褐铁矿、辉铜矿+石英+褐铁矿、辉铜矿+白云石(铁白云石)组合,埋深深度分别为<100 m、100~200 m、>200 m。依据矿石组合类型及蚀变特征,将矿体划分为氧化矿带型(O型)、混合矿带型(M型)、原生矿带型(S型)。矿体组合样化学分析结果显示,矿石中伴生有Ag、Pb、Zn、Bi、Au、Cd、In、Re等多种有益组分,且均与Cu具有一定的相关性。分析认为大宝山铜多金属矿床望香台矿段为浅成低温热液成矿,其成矿机制为含矿热液沿断裂构造向上运移,随着温度、压力及氧逸度等环境变化,热液中成矿元素在成矿有利部位富集成矿,形成原生矿石,地表及浅部铜矿石经历了较强的氧化作用及次生富集作用。The Dabaoshan copper polymetallic deposit is located on the Changdu-Lanping-Simao Block in the Sanjiang metallogenic belt on the southeastern margin of the Qinghai-Tibet Plateau.The deposit is divided into Wangxiangtai,Huashiban,Qinglongshan and Erxigou mining sections from south to north.The Wangxiangtai ore section is located on the southeast side of the deposit,and there are many kinds of ore in the mine section.The types of ore combinations from the surface to the deep are malachite+azurite+limonite,chalcocite+quartz+limonite,chalcocite+dolomite(iron dolomite)combinations,and the buried depths are respectively less than 100 meters,between 100 meters and 200 meters,and greater than 200 meters.According to the type of ore combination and alteration characteristics,the ore bodies are divided into oxidation ore belt(O type),mixed ore belt(M type),and primary ore belt(S type).The chemical analysis results of the ore body assemblage show that Ag,Pb,Zn,Bi,Au,Cd,In,Re and other beneficial components are associated with the ore,and they all have a certain correlation with Cu.Analysis suggests that the Wangxiangtai ore section of the Dabaoshan copper polymetallic deposit is a superficial low-temperature hydrothermal mineralization.The ore-forming mechanism is roughly that the ore-bearing hydrothermal fluid rises along the fault structure.With environmental changes such as temperature,pressure,and oxygen fugacity,the ore-forming elements in the hydrothermal fluid are enriched in oreforming favorable parts to form primary ore.Surface and shallow copper ores have experienced strong oxidation and secondary enrichment.

关 键 词：铜矿石 矿石组合特征 成矿机制 大宝山望香台矿段 维西 云南 

分 类 号：P618[天文地球—矿床学]