河南省泌阳条山铁矿床地质特征及找矿前景  

Geological Characteristics and Ore-Search Prospect of the Tiaoshan Iron Deposit in Biyang, Henan Province

作　　者：刘国范[1] 马庚杰[1] 刘勤安[1] 刘伟颉[1] 刘文忠[1] 周文波[1] 张风瑞[1] 李宁博[1] 

机构地区：[1]河南省地矿局第一地质工程院,河南驻马店463000

出　　处：《地质与勘探》2011年第2期236-243,共8页Geology and Exploration

摘　　要：条山铁、铜多金属矿床位于华北板块与扬子板块的接合部位、秦岭多金属成矿带东段桐柏-大别山成矿亚带内,区内构造线呈NWW向展布,含矿地层为二郎坪群变细碧-角斑岩系,它经历了4个喷发旋回,形成了本区多金属成矿的4个含矿层位。第一旋回的顶部为一富铁矿层,为姑山式火山熔浆型含铜锌磁铁矿层;该层位自陕西三条岭,向东经汤河、太坪镇至桐柏毛集;条山铁、铜多金属矿床分布在二郎坪群变细碧-角斑岩系与燕山期花岗岩接触部位,硅化、绿泥石化、矽卡岩化明显,往往形成富磁铁矿体;矿体呈层状、似层状,透镜状;与围岩呈渐变过渡关系,成因为火山喷流沉积-热液叠加改造富集的块状磁铁矿矿床。区域上NWW-SEE向晚元古-早古生代形成的裂谷型二郎坪蛇绿岩套是本区找矿的最佳区段。二郎坪群含铁层位及夕卡岩化是寻找铁矿的重要找矿标志,二郎坪群蛇绿岩套横贯河南省西南部,连续延伸400余千米,在豫西南寻找该类铁矿前景广阔。The Tiaoshan iron-copper polymetallic deposit is situated in the conjunction area between the North China plate and Yangtze plate,in the Tongbai-Dabieshan metallogenic sub-belt,eastern section of the Qinling polymetallic mineralization belt.Tectonic lines in this region extend in NWW direction.The ore-bearing stratum is spilite-keratophyre in the Erlangping Group.It has undergone four eruption cycles,forming four ore-bearing horizons in this area.The top of the first cycle is an iron-rich ore layer,belonging to the copper-zinc-bearing magnetite of the Gushan-volcanic lava type.It begins from Santiaoling,Shanxi Province,extending eastward by Tanghe and Taipingzhen to Maoji of Tongbai.The Tiaoshan iron deposit lies at the contact between spilite_keratophyre of the Erlangping Group and Yanshan granite,where silicifiction,chlorite and skarn are prominent,often resulting in magnetite-rich ore bodies.These ore bodies look like stratified,quasi-stratified,and lens shapes,with transition relation to surrounding rocks.Its genesis is accumulation by volcanic extrusive sedimentation and hydrothermal superposition reformation.In this region,the NWW-SEE trending rift-style Erlangping ophiolite suit of the late Proterozoic-early Paleozoic is the favorable site for ore search.Moreover,the iron-bearing bed of the Erlangping Group and skarnization are the important indicators for ore search.The Erlangping Group ophiolite suit stretches across western Henan Province for 400km or more,exhibiting a good prospect of search for such iron deposits.

关 键 词：火山喷流沉积 热液叠加改造 找矿前景 条山铁矿床 河南泌阳 

分 类 号：P619.14[天文地球—矿床学]