四川跑马铅锌矿萤石稀土元素地球化学特征与指示意义  

REE Geochemistry of Fluorite from Paoma Lead-Zinc Deposit in Sichuan Province,China and Its Geological Implications

作　　者：吴越[1,2] 张长青[3] 田广[2] 

机构地区：[1]长江大学地球环境与水资源学院,湖北武汉430100 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]中国地质科学院矿产资源研究所,北京100037

出　　处：《矿物学报》2013年第3期295-301,共7页Acta Mineralogica Sinica

基　　金：国家自然科学基金(批准号:40902029);中央级公益性科研院所基本科研业务费专项资金(编号:K0904);地质过程与矿产资源国家重点实验室开放课题基金项目(GPMR2011);成矿作用与资源评价重点实验室开放基金(编号:ZS1102)

摘　　要：跑马铅锌矿是我国川滇黔地区碳酸盐岩容矿的后生铅锌矿床(MVT),矿区萤石与铅锌矿紧密伴生,是主要的脉石矿物。通过对矿区两类不同类型萤石和矿石与围岩的稀土元素地球化学系统研究表明:跑马铅锌矿区成矿流体来源于封存在地层中的海水,属富卤素的氧化型盆地流体。单一的原始成矿流体持续演化在跑马铅锌矿区先后形成紫色萤石、无色萤石与金属硫化物,对应成矿流体从氧化环境向还原环境演变。原始的氧化型成矿流体通过加热富炭质地层(水/岩反应),诱发TSR作用,可能是促使金属硫化物沉淀和流体氧化还原态转变的一个重要因素。Paoma lead-zinc deposit is a carbonate-hold epigenetic deposit in Sichuan-Yunnan-Guizhou area of China.In this deposit,fluorite is the most important gangue minerals and closely associated with lead-zinc mineralization.REE element geochemical characteristics of two different types fluorite and ores were studied.We recognized that ore-forming fluids originated from the formation water were halogen-rich oxidation fluids.The continued evolution of ore-forming fluids formed purple fluorite,colorless fluorite and sulfide in succession,and corresponding ore-forming fluids changed from oxidizing into reducing environment.By heating organic-rich country rock of ore-forming fluids induced TSR reaction and could be a key factor to sulfide mineralization.

关 键 词：萤石 稀土元素地球化学 MVT型铅锌矿 四川宁南 

分 类 号：P611.1[天文地球—矿床学] P595[天文地球—地质学]