云南省景洪市疆锋铁矿疆锋矿段地质特征  

Jiangfeng Ore Section Geological Characteristics of the Jiangfeng Iron Deposit in Jinghong,Yunnan

作　　者：涂显刚 段伟 刘晓东 蒙光志 普天平 黄俊坤 

机构地区：[1]云南省有色地质局三〇六队,昆明650216

出　　处：《地质调查与研究》2015年第1期28-34,共7页Geological Survey and Research

基　　金：云南省景洪市龙鑫矿业有限责任公司:云南省景洪市疆锋铁矿勘探项目

摘　　要：疆锋铁矿位于云南省景洪市勐龙镇南部,矿区及周边出露大面积的元古宇大勐龙群下段地层以及勐海花岗岩体。通过对矿区进行工程勘查,疆锋矿床为一大型铁矿床。矿床分为疆锋矿段和红哨矿段。通过钻探施工,野外编录,样品分析,资料整理,并对比相邻矿山以及同类型相近时代地层矿山的研究成果,结合前人的研究理论,发现疆锋矿段的原生铁矿矿体主要赋存于大勐龙群下段第二层(Ptdm1-2)、第三层(Ptdm1-3)变质岩系透辉石矽卡岩地段。矿体产状与地层产状基本一致,呈似层状产出,岩矿鉴定结果显示矿床与火山沉积以及热液接触关系密切。笔者认为疆锋矿段是由早元古代的铁矿源层,在复杂的区域变质作用和酸性火成岩的热液交代作用下逐渐将铁质析出,并在有利地形位置富集成矿,最终形成火山-沉积变质成因的矽卡岩型铁矿床。Jiangfeng magnetite ore deposit locates in south of Menglong county in Jinghong city,Yunnan province.Strata in this ore district is mainly lower Damenglong Formation,Proterozoic,and Menghai granite body is developed.Based on the analysis of engineering dxploration,we conclude that the Jiangfeng magnetite ore body belongs to a large ore deposit.The deposit can be divided into Jiangfeng and Hongshao ore sections.This paper only discusses the Jiangfeng ore section.By means of drilling,field logging,data treatment,sample analysis and regional comparison,we discover that primary magnetite ore deposit is hosted in the metamorphic series where diopside skarn developed.The specific location is the second（Ptdm^1-2） and third（Ptdm^1-3） layer of the lower section of Daxulong Formation.The ore bodies,most stratiform-like,are basically consistent with strata.The results of rock-mineral identification show that the deposit is closely related with the volcano sedimentary and hydrothermal contact.Conclusion demonstrated that iron ore source layer in Early Proterozoic experienced complicated regional metamorphism and Hydrothermal metasomatism from acid igneous rock,and during this process iron separated out.Skarn type magnetite deposit then enriched in favorable topographic position.

关 键 词：火山-沉积变质成因 疆锋铁矿 矽卡岩型铁矿床 云南 

分 类 号：P618.31[天文地球—矿床学]