土壤地球化学测量在陕西勉县瓦子坪铅锌多金属矿勘查中的应用

勉略阳三角区是陕西南部重要的多金属矿集区,瓦子坪测区位于勉略康构造混杂岩成矿带东段,银铅锌背景高,成矿物源丰富,地质条件有利。在全区1:2.5万土壤地球化学测量的基础上,采用多元统计方法,对Au、Ag、Cu、Pb、Zn、Co、As、W、Ni、Cr、P、Mn共12种元素进行研究,分析了地球化学特征参数、元素相关性、元素分布和单元素异常特征,总结了元素组合、富集贫化规律及其各单元元素与其地质背景的对应关系,结合区内成矿地质构造背景和已知矿点等信息,圈定了14处综合异常,优选出3个找矿靶区。通过对典型异常的查证工作,运用槽探工程进行揭露,在本区发现6条蚀变带,13条矿体,表明该方法在本地区具有良好的找矿应用价值。

Application of Soil Geochemical Survey in the Exploration of Lead-Zinc Polymetallic Ore in Waziping,Mianxian County,Shaanxi Province

The Mianlueyang triangle area is an important polymetallic ore concentration area in the south of Shaanxi Province. The Waziping survey area is located in the eastern part of the Mianluekang structural melange metallogenic belt, silver-lead-zinc has high background, rich mineral sources and favorable geological conditions. On the basis of 1:25,000 soil geochemical survey in the whole region, 12 elements of Au, Ag, Cu, Pb, Zn, Co, As, W, Ni, Cr, P and Mn were studied by means of multivariate statistical method. The geochemical characteristic parameters, element correlation, element distribution and single element anomaly characteristics were analyzed. In this paper, the law of element combination,enrichment dilution and the corresponding relationship between each element and its geological background are summarized. Combined with the information of metallogenic geological structure background and known ore spots in the area, 14 comprehensive anomalies are delineated, and three prospecting targets are optimized. Through the verification of typical anomalies, the channel exploration project is used to expose them, 6 alteration zones and 13 ore bodies are found in this area, which shows that this method has a good prospecting application value in this area.