基于MRAS证据权重法的陕西省凤县河口地区金矿找矿预测

Forecast of Gold Deposit Prospecting in Hekou Area,Fengxian County,Shaanxi Province Based on MRAS Weight of Evidence Method

陕西省凤县河口地区已有八卦庙特大型金矿床1处,为了进一步开展金矿找矿预测,首次基于MRAS软件的证据权重法对该区金矿进行成矿预测。在充分收集各种地质、矿产、构造、物化遥资料的基础上,系统总结该区金矿成矿规律,构建了金矿综合信息找矿预测模型,提取并构置了星红铺地层、断裂、化探异常、遥感等15个预测要素作为证据因子。采用“不规则地质单元”法,以河口地区泥盆系地层范围作为金矿预测单元范围。经后验概率计算,将预测区块划分为A、B、C 3个等级,并圈定了4个找矿靶区。

There is already one Baguamiao super-large gold deposit in Hekou area of Fengxian County,Shaanxi Province.In order to further develop gold prospecting predictions,for the first time,the gold deposits in this area are predicted based on the weight of evidence method of MRAS software.On the basis of fully collecting various geological,mineral,structural,physical and chemical remote data,systematically summarized the gold mineralization law in this area,constructed a comprehensive gold mine prospecting prediction model,extracted and constructed the Xinghongpu stratum and fault fifteen predictive factors,such as anomalies in geochemical exploration,and remote sensing,are used as evidence factors.The"irregular geological unit"method is adopted,and the range of the devonian strata in the estuary area is used as the range of the gold mine prediction unit.After calculating the posterior probability,the predicted block is divided into three levels:A,B,and C,and four prospecting target areas are delineated.