模糊层次分析法在西南印度洋中脊46°~52°E多金属硫化物远景区预测中的应用  

Application of fuzzy analytic hierarchy process to mineral prospectivity mapping of polymetallic sulfide deposits in the Southwest Indian ridge between 46°to 52°E

作　　者：马瑶 赵江南[1] 廖时理 Ma Yao;Zhao Jiangnan;Liao Shili(Faculty of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China;Second Institute of Oceanography,Ministy of Natural Resources,Key Laboratory of Submarine Geosciences,Hangzhou 310012,China)

机构地区：[1]中国地质大学(武汉)资源学院,武汉430074 [2]自然资源部第二海洋研究所自然资源部海底科学重点实验室,杭州310012

出　　处：《地质科技通报》2020年第6期75-82,共8页Bulletin of Geological Science and Technology

基　　金：国家重点研发计划(2017YFC0306803,2016YFC0600509)。

摘　　要：海底多金属硫化物作为热液活动的产物,具有较好的成矿远景和开发潜力,已成为各国海洋矿产勘探的重点。模糊层次分析法将模糊数学和专家知识相结合,是一种典型的知识驱动的矿产资源定量预测方法。利用该方法对西南印度洋中脊46°~52°E研究区进行了数据处理,结合专家经验计算9个证据层的权重值,最后由伽马算子进行综合,生成最终的海底硫化物矿床远景区预测图。通过预测-面积(P-A)图分析,确定模糊层次分析法的最优γ值为0.9。用C-A分形的方法确定了不同成矿概率水平对应的阈值,在此基础上评估了方法的预测性能。结果表明,在基于模糊层次分析法的预测模型中,ROC曲线下的面积为0.887,预测的热液点和地震点占已知的90.5%,表明该方法能够有效地预测研究区的有利成矿区域,为今后的海底硫化物勘探提供依据。As a product of hydrothermal activity,seabed polymetallic sulfides have good prospects for mineralization and development potential,and it has become the focus of marine mineral exploration in various countries.Fuzzy analytic hierarchy process(FAHP),which combines fuzzy mathematics with expert knowledge,is a typical knowledge-driven quantitative prediction method for mineral resources.In this paper,the method is used to process the Polymetallic sulfide in the southwest Indian ridge.The weights of the nine evidence layers are calculated by combining expert experience.Finally,the gamma operator is used to synthesize the final prospective map.Through prediction-area(P-A)plot analysis,the optimalγfor FAHP was determined as 0.9.The threshold corresponding to different mineralization probability levels was determined by C-A fractal method,and the prediction performance of the method was evaluated.The results showed that in the prediction model based on FAHP,the area under the ROC curve was 0.887 and 90.5%of the known hydrothermal point and seismic point were predicted.Therefore,the method can effectively predict the favorable mineralization of the study area and can provide directions for future prospecting.

关 键 词：矿产资源定量预测 模糊层次分析法 多金属硫化物矿床 西南印度洋中脊 

分 类 号：P578.2[天文地球—矿物学]