大冶铁矿田铁山矿区三维地质体建模及深部成矿预测

Three-dimensional geologic modeling and deep ore body prospecting of Tieshan iron deposit of Daye iron ore district

利用三维地质体建模软件Minexplorer建立了湖北大冶铁矿田铁山矿区矽卡岩矿体的三维地质模型,并对其进行了深部成矿预测。通过收集钻孔数据,建立地质数据库,生成三维钻孔;通过剖面定义、单工程矿体圈定、剖面编辑、曲面连接、封装成体建立矿体三维模型,获得铁山矿区三维地形-地质模型。该模型显示,铁山矿体呈NWW向展布,应沿该方向部署找矿;黑云母辉石闪长岩呈S形接触的转折部位是成矿的有利位置。矿体与航磁异常复合关系表明,5号矿体下方存在巨大找矿潜力,狮子山-尖山是下一步找矿勘探的重点方向。2号矿体与地层复合关系表明,铁矿体主要赋存于闪长岩上方和大理岩下方,因此,沿闪长岩和大理岩往下延伸可以寻找铁矿体。2号矿体主成矿元素Fe含量具有随深度增加而逐渐降低的变化趋势,显示矿化强度由浅部到深部逐渐减弱的变化特点,暗示2号矿体在-700 m深部以下的找矿潜力较小。三维控矿构造界面的凹兜部位和平缓部位是找矿的有利位置。

This paper builds the three dimensional model of skarn ore body of the Tieshan iron deposit and forecasts the deep ore body of the deposit by Minexplorer software which is a three dimensional model building software. It builds the geological database using many drill data and demonstrates those drill holes in three dimensional view. After the process of profile definition, delineation of ore body in a single drill hole, edition of profiles, connection of surfaces, encapsulation of surfaces, it builds the model of those ore bodies in three dimensions. Three dimensional terrain-geological model of the Tieshan iron deposit shows that the NWW trending of the Tieshan iron ore body prospecting along NWW direction. The turning points of S shaped contact of biotite py- roxene diorite are favourable metallogenic position. The composite relationship between the ore body and aero- magnetic anomaly shows that ore prospecting potential is huge under No. 5 ore body, the Shizishan-Jianshan is the next step prospecting direction. The complex relationship between No. 2 ore body and stratum shows that iron ore bodies mainly occur above diorite and occur below marble, therefore the diorite and marble extending downwards can look for iron ore bodies. The iron elements of No. 2 ore body decrease with depth increase, shows mineralization intensity from shallow to deep weakened gradually, suggesting that - 700 m depth below No. 2 ore body is a smaller potential prospects. The concavity and gentle part of three dimensional ore controlling structure interface is prospecting advantageous position.