滇西羊拉铜矿三维成矿预测及靶区优选

Three-dimensional metallogenic prediction model and prospecting target selection in Yangla copper deposit,West Yunnan Province

近年来,羊拉铜矿已探明矿产资源储量严重消耗,矿业形势严峻。为进一步探明矿区深、边部找矿有利部位,以地质勘查成果为依据,结合区域成矿背景,深入分析矿床地质特征、围岩蚀变及侵入体等,基于GIS、Geomodeller软件平台构建矿床三维数据库和地表、地层、岩体、断层和已知矿体的三维地质模型,从三维角度揭示地层单元、地质构造、蚀变信息、侵入体及地质复杂度与成矿的关联度,得出构造、岩浆岩为关键证据因子,构建了基于证据权法的找矿预测模型,圈定2处成矿有利靶区。预测结果显示,预测远景区与含矿岩体、深部侵入体及构造交汇部位具有较好的空间一致性,表明预测结果准确、可靠,矿区西部、东北部是矿区下一步找矿工作的重要区域。

In recent years,the mineral reserves proved in Yangla copper deposit have been consumed excessively,and the mining situation is very serious for the deposit.In order to further explore the favorable prospecting targets in the depth and periphery area of the mining district,the geological characteristics of copper deposit,the alteration feature of surrounding rock and intrusive rock body are systematically analyzed and summaried on the basis of geological exploration result and with the combination of regional metallogenic background.The 3D database of the copper deposit and 3D geological model of the surface,strata,rock mass,faults and known orebodies are constructed on GIS,Geomodeller software platforms.The correlation between geological unit,geological structure,alteration information,intrusive rock body,geological complexity and mineralization is analyzed in a three-dimensional view,and the structure and magmatic rock bodies are considered as the key evidence factors.A prospecting prediction model based on evidence methods is constructed,and two favorable metallogenic target areas are found out.The prediction result shows that there is a good spatial consistency between the predicted prospecting area and the ore-bearing rock mass,the deep intrusive body and the intersection place of the structures.It is indicated that the mineral prediction result is accurate and reliable.The paper has suggested that the western and northeastern areas are the important targets for the future prospecting work in the mining area.