基于多元信息的证据权法在南岭钨锡多金属成矿预测中的应用

以南岭成矿带1∶50万地质数据库、物化探数据为信息源,通过数据处理、分析与推断,编制相关成果图件。以GIS为平台、地质异常理论为指导,基于多元信息成矿耦合分析与异常提取,优选找矿要素有利区间并构建了13个有效证据层,基于Morpas、Arc-wofe证据权模型开展了成矿定量预测与评价。以0.024、0.078和0.098为后验概率临界值划分了三级成矿远景区,共圈定一级远景区41个、二级远景区70个和三级远景区85个,为该区找矿工作部署及资源规划提供了参考。

Application of weights of evidence method for prediction of W-Sn polymetallic deposits based on multi-source information in Nanling metallogenic belt

According to1:500000 geological database, geophysical and geochemical exploration data in Nanling metallogenic belt, all kinds of related maps were compiled by data-processing, analyzing and interpreting. On ba-sis of the GIS platform, guided by the geological anomaly theory, all favorable ranges of prospecting factors were selected through multi-information metallogenic coupling analysis and anomalous information extraction. Finally, 13 effective evidence layers were built. Ore-forming quantitative prediction and assessment was done based on weights of evidence of Morpas and Arc-wofe model. According to the critical value of 0.024、0.078 and 0.098, 41 for prospecting,70 secondary prospect areas and 85 triple prospect areas were submited, it was significanct to plan work and plan mineral resources in the region.