摘要
吉林东部(延边地区)中生代以来不同方向的断裂构造发育,火山活动强烈,岩浆侵入频繁,与中生代火山-岩浆活动有成因联系的金、铜多金属矿床多处,矿化蚀变线索多见,构成了知名度很高的五凤-小西南岔近东西向火山-岩浆期后低温热液型金、铜多金属成矿带.区内中生代火山-岩浆岩的形成是上地幔岩浆上侵的结果,同时伴有成矿作用的发生,在构造有利部位形成金、金铜或铜金多金属矿体.成矿物质来源于地幔,成矿是在酸性介质中还原条件下发生的.从远源至近源,成矿分带为Au、AgAu、Cu、AgCu、Au、Pb、ZnCu、(Mo、Au),成矿温度从低温至高温变化,硫化物从贫硫化物向富硫化物变化.
The Mesozoic continental volcanic fault basin in Eastern Jilin is tectonically located in Yanbian synclinorium of Yanbian eugeosyncline fold belt.Since Mesozoic,faults with different directions,intense volcanic activities and frequent magma intrusions have been developing in this area.Gold,copper and polymetal deposits,as well as mineralizing alterations,which are genetically related to the Mesozoic volcanic magmatic activities,are commonly seen,forming the well known E W trending Wufeng Xiaoxinancha post volcanic magmatic stage epithermal Au Cu polymetal metallogenic belt.The Mesozoic volcanic magmatic rocks in the region are the result of mantle magma intrusion,accompanied by mineralization,with Au Cu polymetal orebodies formed in favorable structural positions.The ore forming matters are derived from the mantle.The mineralization took place in acid media under a reduction condition.From far source to near source,with the mineralizing zonation of Au,Ag Au,Cu,Ag Cu,Au,Pb,Zn Cu(Mo,Au),the ore forming temperatures change from low to high;while the sulphide contents vary from poor to abundant.<P>
出处
《地质与资源》
CAS
2003年第2期72-77,共6页
Geology and Resources
基金
原地质矿产部定向科研项目(地科定98-05)部分成果.
