【摘要】 针对成矿定量预测强调三维空间信息的综合研究的特殊需求,以及定性与定量、二维与三维数据综合分析难等关键问题,本文提出了一种基于三维非均质空间的加权最短距离场算法,既可反映断层破碎带在成矿元素运移过程中的通道作用,亦可回溯出目标体元到源体元的最短路径。应用该方法开展了对红透山铜矿区的三维矿体模型在地表的距离场值与土壤地球化学测量数据的关联关系分析,发现已知和预测矿体共同的距离场与化探异常有更高的匹配性,间接证明了预测矿体的可靠性。该方法一定程度上解释了由矿体导致的地表化探异常,可以为化探、遥感等地表数据与三维地质数据模型进行综合分析及关联关系的提取提供借鉴。更多还原

【Abstract】 Objectives:Quantitative prediction of mineralization requires comprehensive study on three-dimensional spatial information,and it is also confronted with the comprehensive analysis difficulties between qualitative and quantitative data,two-dimensional and three-dimensional data. Methods:A weighted shortest-distance field algorithm for the 3D heterogenetic space was developed,in which faults rupture zone can be treated as migration pathway of ore element and the shortest path can also be tracked back from any object voxel to source voxels.The algorithm was used to analysis the relation between the distance field value of the 3D ore-body model on the earth’s surface and soil geochemical survey data in Hongtoushan copper mine area,China. Results:Studies show the geochemical anomaly matches better with the joint distance filed of known and predicted ore-bodies than with the distance filed of only known bodies,which indirectly approved the reliability of predicted ore-bodies. Conclusions:This method can interpret the most of geochemical survey anomaly which caused by ore-bodies,and can serves as a model for the comprehensive analysis and the relation extraction between geochemical survey,remote sensing data and three-dimensional geological data model.更多还原