辽宁本溪大台沟铁矿地质特征及找矿标志.docx

文章编号：1671-1947（2014）04-0343-10中图分类号：P618.31文献标识码：A辽宁本溪大台沟铁矿地质特征及找矿标志张，邵军，鲍庆中，王宏博，周永恒（沈阳地质矿产研究所/中国地质调查局沈阳地质调查中心，辽宁沈阳110034）摘要：辽宁本溪大台沟铁矿为鞍山-本溪铁矿成矿带内发现的首个位于标高-1000m以下的特大型“鞍山式”铁矿床，含矿岩系为近直立展布的鞍山群樱桃园岩组，包含其内的铁矿体为隐伏的厚板状陡倾斜矿体，矿体埋深1100～1200m，控制矿体延长2000m.矿体自上向下可划分3种自然矿石类型，分别为赤铁矿石、赤铁磁铁复合矿石及磁铁矿石.大台沟铁矿床属典型“鞍山式”铁矿床，矿物成分较简单，含铁矿物以磁铁矿和赤铁矿（镜铁矿）为主；矿石结构类型有镶嵌粒状变晶结构、鳞片粒状变晶结构、柱状粒状变晶结构等；矿石构造类型以条带状为主.铁矿石TFe品位平均为29.34%；mFe品位平均为14.63%；矿石中其他元素含量除SiO2较高外，均甚微，SiO2平均含量46.08%.笔者在阐述大台沟铁矿地质特征基础上，总结出大台沟铁矿找矿标志，对于区域内潜在的“大台沟式”（埋藏较深、存在高大磁异常）铁矿床的找寻具有一定借鉴意义.关键词：大台沟铁矿；樱桃园岩组；鞍山式铁矿；地质特征；找矿标志；辽宁省DOI:10.13686/ki.dzyzy.2014.04.007GEOLOGICALCHARACTERISTICSANDPROSPECTINGINDICATORSFORDATAIGOUIRONDEPOSITINBENXI,LIAONINGPROVINCEZHANGJing,SHAOJun,BAOQing-zhong,WANGHong-bo,ZHOUYong-heng（ShenyangInstituteofGeologyandMineralResources,Shenyang110034,China）Abstract：TheDataigouirondepositinBenxi,LiaoningProvinceisthefirstoversizeAnshan-typeirondepositexploredbelowelevationof-1000minAnshan-Benxiironoremetallogenicbelt.Theore-bearingrockseriesareYingtaoyuanFormationofAnshanGroup,withconcealedsteeplydippingtabularironorebodyinside,buriedin1100-1200mdeepwithextensionof2000mlong.Theorebodyfallsintothreenaturaloretypesfromtoptobottom,i.e.hematite,hematite-magnetitecomplexandmagnetiteores.TheDataigouirondepositisoftypicalAnshan-typewithsimplemineralcompositions,includingiron-bearingmineralsdominatedbymagnetiteandhematite（specularite）.Theironoresareinmosaic,lepidoandcolumnargranoblastictextures,withmainlybandedstructure.TheaveragegradeofTFeis29.34%,withmFeof14.63%,SiO2of46.08%andlittleotherelements.Basedonthegeologicalcharacteristics,theprospectingindicatorsofDataigouirondepositaresummarized,whichwouldprovidereferenceforprospectingpotentialirondepositswithdeepburialandsignificantmagneticanomalyintheregion.Keywords：Dataigouirondeposit;YingtaoyuanFormation;Anshan-typeirondeposit;geologicalcharacteristic;prospectingindicator;LiaoningProvince0前言辽宁省本溪市桥头镇大台沟铁矿位于鞍山-本溪铁矿成矿带的东部，周边大型铁矿密布，西侧约20km处为弓长岭铁矿，南（偏东）约10km处有南芬铁矿、徐家堡子铁矿，北约8km处为北台铁矿，东侧约