阿尔金山东段多元信息找矿预测

摘要

The eastern segment of the Altun Mountain is located at the eastern part of the NEE-trending Altun tectonic belt at the northern edge of the Tibetan plateau.It is regarded as the westward extension of the Qilian metallogenic belt because of the left-lateral displacement of the Altun fault during the Cenozoic.The area has favorable geological conditions for mineralization.Based on metallogenetic and deposit features in the study area,the spectral curves of altered rocks with jarosite and limonitization are analyzed,and the related mineralization-alteration information is extracted from the enhanced thematic mapper (ETM +).In combination with the geological and geochemical data in the eastern segment of the Altun Mountain,prospecting models with different kinds of ore are established by weighting of different types of data and the GIS technology.With the guidance of prospecting models,13 potential prospective areas are delineated and evaluated,including 4 gold deposit,2 iron deposit,and 7 zinc-lead (copper) deposit prospect areas.Some of the different mineral prospect areas are verified by field investigations and the results show that the prospect areas,which are characterized by ductile-brittle deformation and mineralization,have a great ore prospecting potential.This study is significant for mineral prospecting in the eastern segment of the Altun Mountain.%阿尔金山东段处于青藏高原北缘,NEE走向阿尔金构造带的东段,为祁连山成矿带被新生代阿尔金断裂左旋走滑截切的西延部分,具有良好的成矿地质条件.该文在总结阿尔金山东段成矿规律和矿床特征的基础上,采集测试了地表黄钾铁矾和褐铁矿化蚀变岩光谱曲线,在ETM+影像上提取了相关蚀变信息,并结合分析地质、地球化学信息,根据预测矿种的差异性,运用证据权法在GIS平台上建立了不同矿种的找矿模型.依据多元信息找矿模型,共圈定和评价了金矿远景区4个,铁矿远景区2个,铅锌(铜)多金属矿远景区7个.对不同矿种部分远景区进行野外验证表明,预测区岩石多发育韧脆性变形和不同类型矿化,指示较好的找矿潜力,此次研究对阿尔金山东段地区的找矿工作具有指导意义.