河南栾川西沟铅锌银金矿床三维地质建模与深部找矿预测评价

随着矿区浅部矿的日益减少,深部找矿越来越受到重视,三维地质建模技术在成矿预测、资源定量评价等方面得到了广泛的应用。本文利用三维地质建模平台GOCAD中的三维建模技术及地质统计学等方法,基于收集测试得到的地质图、钻孔和采样点的地层、岩性、构造、品位等数据,构建了西沟铅锌银金矿区的三维地质模型,包括断裂构造模型、矿体模型及地层模型等,并且通过离散光滑插值及克里金插值等方法建立了西沟铅锌银金矿区的三维属性模型,完成了矿区3处找矿预测靶区的圈定与评价。基于地质认识及建立的矿区三维地质模型的研究认为:(1)该矿床的找矿有利标志主要为地层、构造、辉长岩以及品位指示等4个方面;(2)基于三维地质建模技术的找矿预测方法科学有效;(3)S139矿体的中部及东南部深部仍有找矿潜力。本文能够为将来的深部找矿突破提供一定的参考依据。

Three-dimensional geological modeling and deep prospectivity of the Xigou Pb-Zn-Ag-Au deposit,Henan Province

With decreasing shallow mineral ore deposits in mining zones, more attention is paid to deep prospectivity as three-dimensional geological modeling technology becomes widely used in metallogenic prediction and quantitative resource evaluation. Based on geological mapping and drilling as well as geological data on the stratigraphy, lithology, structure and grade of the sampling site, we performed 3D geological modeling and geostatistical analysis using GOCAD to construct the 3D structual, orebody and stratigraphic models of the Xigou Pb-Zn-Ag-Au deposit. On the basis of the constructed geological models, a 3D attribute model of the deposit was constructed using the discrete smooth interpolation and Kriging interpolation methods, and then three prospecting targets in the mining area were delineated and evaluated. The geological knowledge-based 3D modeling study reveals: (1) The favorable indicators for ore prospecting in the Xigou Pb-Zn-Ag-Au deposit are stratum, structure, gabbro and grade. (2) The prediction method based on 3D geological modeling is scientific and effective. (3) The mid and southeast deep areas of the S139 orebody have good mineral prospecting potentials. This paper provides a reference for future breakthroughs in deep prospecting.