江西桃山罗布里南部地区三维地质建模与成矿预测

三维地质建模技术是中国"玻璃地球"战略的支撑技术之一, 对推动国家资源的可持续发展具有重要的现实意义。基于3Dmine建模平台和前人研究成果, 以钻孔、勘探线剖面等资料为依据, 初步建立了桃山罗布里南部地区的地质数据库和三维地质模型。基于Visualstat地质统计模块, 分析样品点文件, 确定长轴、次轴与短轴参数, 寻求实验半变异函数, 再通过验证与模拟确定变异函数。最后, 利用克里格法对空块模型赋值, 建立了基于三维建模的罗布里南部地区三维预测体系, 探讨了"立方体预测模型"找矿方法的可行性, 初步把建模区变量类型划分为矿体赋存岩体变量、碎裂蚀变带变量和铀克里格品位估值变量, 并且分别对这3类主要变量进行立方体单元的划分与提取。最终用数理统计的方法计算, 圈定了找矿靶区位置, 预测成矿概率为65.60%。

Three dimensional geological modeling and metallogenic prediction in the south of Luobuli,Taoshan, Jiangxi Province

The 3D geological modeling technology is one of the supporting technologies of the Glass Earth in Chinese strategy, which has important practical significance to promote the sustainable development of national resources. Based on the 3Dmine modeling platform and previous research results, the geological database and three-dimensional geological model of the south of Luobuli in Taoshan are preliminarily established based on the data of drilling and exploration line profile. Based on the geostatistics module of visualstat, the parameters of major axis, minor axis and short axis are determined by analyzing the sample point file, and the semi variogram of experiment is sought, and then the variation function is determined through verification and simulation. Finally, the Kriging method is used to evaluate the empty block model, and the three-dimensional prediction system based on three-dimensional modeling is established in the south of Luobuli. The feasibility of the "cube prediction model" prospecting method is discussed. The variable types in the modeling area are preliminarily divided into three types: ore body occurrence variable, fracture alteration zone variable and uranium Kriging grade estimation variable. The variables are used to partition and extract the cube elements. Finally, the location of prospecting target area is delineated by mathematical statistics method, and the predicted metallogenic probability is 65.60%.