基于GIS的证据权重法在黑龙江省西北部金矿成矿预测中的应用

An Application of GIS-Based Weights of Evidence for Gold Prospecting in the Northwest of Heilongjiang Province

在分析了黑龙江西北部地区金矿床成矿特征的基础上,建立了区域金矿找矿模型,然后提取了各类找矿信息,并在GIS中构成了与成矿有关的地层、构造、岩浆岩、遥感、物探、化探异常等11个证据图层。用证据权重模型统计综合证据图层生成研究区成矿后验概率图。按照后验概率相对大小把预测区成矿可能性划分成三级,圈定5个Ⅰ级成矿远景区,为在黑龙江省西北部进一步找矿奠定了基础。

Based on the analysis of metallogenetic characteristics of the gold deposits in the northwest area of Heilongjiang Province, the gold prospecting model is built. Various geological anomalous information of the area is analyzed. Eleven evidence layers, relating to mineralization, such as strata, structures, magmatites, remote sensing, geophysical and geochemical anomalies, are extracted. The weight evidence method is applied to simulate the mine evaluation of the study area. Based on the posteriori probabilities, three-grade prospective subareas have been classified and five first-grade metallogenetic targets have been outlined. It provides a way of selecting target area in the process of looking for mineral resources.