基于MRAS证据权重法的红旗岭—漂河川地区金成矿预测

    Metallogenic prediction of gold deposits in Hongqiling-Piaohechuan area based on MRAS evidence weight method

    • 摘要: 红旗岭—漂河川地区位于兴蒙造山带东段南缘,成矿地质条件有利,区内矿产资源丰富。在收集、整理区域地质资料的基础上,总结了该地区的金成矿规律并建立岩浆热液型金矿找矿模型。基于矿产资源评价系统(MRAS)证据权重法,采用0.75 km×0.75 km规格的网格单元进行成矿预测。提取并构建了变质岩系、中酸性侵入岩、断裂附近1.5 km缓冲区、大面积正磁场、水系沉积物地球化学异常(Ag、As、Au等)共13个证据因子,通过对各证据因子进行先验概率计算、权重值统计、独立性检验及后验概率计算,圈定金矿A类找矿远景区1个、B类找矿远景区5个、C类找矿远景区1个,综合认为蛇岭沟—寒上找矿远景区成矿地质条件较好,具有一定找矿潜力,是区内寻找岩浆热液型金矿的重点区域。研究成果可为区内金矿找矿工作提供参考。

       

      Abstract: Hongqiling-Piaohechuan area is located in the southern margin of the eastern Xingmeng orogenic belt. The metallogenic geological condition in this area is profitable and the mineral resources are abundant. The metallogenic regularity of gold deposits was summarized and the prospecting model was established on the basis of couecting and sorting out regional geological data. A total of 13 evidentiary factors were extracted and constructed, including metamorphic rock series, intermediate-acidic intrusive rocks, 1.5 km buffer zone around the faults, large scale positive magnetic fields, and geochemical anomalies (Ag, As, Au, etc.) in stream sediments. A grid cell of 0.75 km×0.75 km was used to conduct mineral prospect prediction on the basis of MRAS evidence weight method. A A-level mineral prospecting potential area, five B-level mineal prospecting potential areas and a C-level mineral prospecting potential area were delineated after the process of the prior probability calculation, weight value statistical analysis, independence test and the posterior probability calculation of the evidence factors. It was considered that the geological conditions of Shelinggou-Hanshang gold prospecting area were well, which had good prospecting potential, and was the key area for magmatic hydrothermal type gold deposits. The research achievements could provide references for gold deposits exploration within the region.

       

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