摘要
条山中型富铁矿床赋存于豫西南东秦岭二郎坪群地层内。矿区主要构造形迹为轴向NW-SE的条山背斜,褶皱内层间滑脱面的张性空间控制了区内主要矿体的定位。矿区由2个矿带组成:A矿带位于背斜NE翼,以块状磁铁矿矿石为主;B矿带位于背斜轴部偏NE翼,以条带状磁铁矿矿石为主。根据B矿带近矿围岩中的锆石和A矿带磁铁矿矿石中的磷灰石、锆石LA-ICP-MS U-Pb同位素测年结果分析及区域对比,推测成矿物质应主要源于下古生界二郎坪群,后期区域变质作用、混合岩化作用对富铁矿体的形成起着重要的改造富集作用。矿区各类岩(矿)石磁性差异大,地表矿体出露范围与正磁异常范围吻合较好,高精度磁测数据2.5D反演结果基本能够反映矿体延伸。根据矿区地质、地球物理特征及矿床形成过程的综合分析构建了矿区综合找矿模型。后期钻探工程见矿效果良好,表明构建的找矿模型对区内同类型矿床的找矿勘查工作具有重要参考意义。
The Tiaoshan medium-sized rich iron deposit is located in the Erlangping group of East Qinling,southwestern Henan Province.The main structural features of the Tiaoshan mining area is the NW-SE-trending Tiaoshan anticline,and the interlayer detachment surface tension space of the fold control of the positioning of the orebodies.There are two ore belts in the mining area.Ore belt A is located in the NE wing of the fold,mainly in massive magnetite ore.Ore belt B is located in the anticline’s axis partial NE wing,mainly in banded magnetite ore.In this paper,based on the analysis of LA-ICP-MS U-Pb isotopic dating of ziron from B ore belt’s near-ore rock and apatite and ziron from A ore belt’s magnetite ore and regional comparison,the authors consider that the metallogenic materials of Tiaoshan ore deposit were possibly derived from the construction of the early Paleozoic Erlangping group,and later regional metamorphism and magmatization played an important role in the transformation and concentration of these materials.Magnetic susceptibility of the main rock and ore in Tiaoshan mining area vary from each other,and orebodies exposed range of surface is in good agreement with the positive magnetic anomalies range.The result of high-precision magnetic measurement data 2.5D inversion can basically reflect orebodies extension.According to a comprehensive analysis of the geological and geophysical characteristics of the mining area and the process of mineralization,the authors constructed the comprehensive prospecting model.The result of drilling verification later shows a good prospecting effect.So the comprehensive prospecting model has important reference significance for the prospecting work of the Tiaoshan iron deposit and the same type of deposit in the region.
出处
《地质科技情报》
CAS
CSCD
北大核心
2013年第2期62-70,共9页
Geological Science and Technology Information
基金
河南省国土资源厅项目"河南省主要成矿区带深部找矿研究"(2010-61-3)
关键词
矽卡岩
二郎坪群
东秦岭
磁法
河南
skarn
Erlangping Group
east Qinling
magnetic method
Henan Province
