新疆青河顿巴斯套金矿区异常信息提取的方法研究

摘要

异常提取是地球化学勘查中的重要环节，对圈定成矿有利地段，指导找矿非常重要。以新疆青河顿巴斯套金矿区1∶1万土壤地球化学数据为研究对象，分别用传统方法、含量－面积分形方法和滑动平均法对 Au、Ag、As、Sb、Cu、Pb、Zn 7种元素进行了异常圈定，结合地质资料对比发现：传统的方法圈出的异常范围较小，只在主矿体上出现异常；含量－面积法圈出的异常范围大，更能体现出地球化学的“弱小”异常；滑动平均法与区内已知的矿（化）体吻合最好，异常分布合理，亦可突出“弱小”异常。滑动平均法在矿区中北地段圈出的高强度异常，浓度分带明显，野外调查发现异常位于浅变质粉砂岩中，褐铁矿化比较发育，显示较好的找矿信息。%Information retrieval of anomalies as one of the key links in geochemical exploration is very important to the delineation of favorable ore-forming sections and prospecting guidance.The paper takes 1∶10 000 soil geochemi-cal survey data in Dunbasitao Gold District in Qinghe County,Xinjiang,as the research subject,delineates 7 elements, namely Au,Ag,As,Sb,Cu,Pb,Zn by conventional method,content-area fractal dimension method and slide average method,and combined with geological data,finds:conventional method gets limited delineation of anomaly,focusing on major orebodies;content-area method renders larger delineation of anomaly,better exhibiting subtle geochemical a-nomalies;slide average method best matches known regional mineralized bodies,with reasonable distribution of anom-alies and acceptable display of subtleties.The strong anomalies delineated at the north section of the mining district by slide average method are distinct in concentration zonation.Outdoor investigation finds that anomalies often occur in epimetamorphic siltstone and ferritization develops,indicating favorable prospecting conditions.