模糊证据权方法在纳米比亚白岗岩型铀矿预测中的应用

纳米比亚埃龙戈地区位于达马拉构造带中部, 是全球重要的铀成矿带, 但纳米比亚第四系覆盖较重, 严重影响了铀矿找矿效果。为摸清纳米比亚铀资源现状, 开展铀资源潜力评价工作, 充分利用和深度挖掘现有资料, 圈定了预测靶区, 为中国矿业企业在海外投资提供支撑。在对纳米比亚埃龙戈地区白岗岩型铀矿床控矿因素系统总结的基础上, 建立了综合信息找矿模型; 在GeoDAS GIS平台上, 利用非线性理论、奇异性理论及分形滤波技术, 实现了对该区隐伏构造、航放铀异常等弱缓信息的提取; 基于模糊证据权方法开展综合信息矿产预测, 圈定铀找矿远景区7个。通过模型检验, 验证了本次预测工作的有效性。认为Ⅰ级远景区内第四系覆盖区还存在巨大的找矿潜力, Ⅱ级远景区也具有较好的成矿条件, 但工作程度较低, 有望实现找矿突破。

Application of fuzzy weights of evidence method in metallogenic prediction for alaskite-type uranium deposits in Namibia

The Erongo area of Namibia, located in the central of Damara tectonic belt, is an important uranium metallogenic belt in the world. However, the Quaternary coverage in Namibia is heavy, which seriously affects the prospecting effect of uranium deposits. In order to find out the status of uranium resources in Namibia, we have carried out the uranium resources potential evaluation, which has made full use of and deeply excavate the existing data, delineated the prediction target area, and provided support for Chinese mining enterprises to invest overseas. Based on the systematic summary of the ore-controlling factors of the alaskite-type uranium deposits in the Erongo area of Namibia, a comprehensive information prospecting model is established. On the GeoDAS GIS platform, nonlinear theory, singularity theory and fractal filtering technology are used to extract weak and slow information such as hidden structure and aero-released uranium anomaly in this area. Based on the fuzzy evidence weight method, the comprehensive information mineral prediction is carried out, and 7 uranium prospecting areas are delineated. The validity of this prediction is verified by model test. The paper holds that there is still huge prospecting potential in the Quaternary coverage area of the Grade Ⅰ prospect area, and the grade Ⅱ prospect area also has good ore-forming conditions, which is expected to achieve a breakthrough in prospecting because of the low working degree.