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本文通过实例，介绍了吉南玄武岩覆盖区水化学异常查证的化探工作方法。综合研究已有地质条件，认为吉南沿江村、马鹿沟水化学异常地区成矿地质条件有利。结合微景观特点，在沿江异常区２ｋｍ２范围内应用汞气测量圈出区内断裂构造带展布方向。岩石剖面、土壤测量显示出构造经历过热液矿化活动，矿化体埋藏较深。根据土壤测量结果优选出验证靶区。钻探验证结果在地表６２０ｍ以下发现了近３０ｍ厚的Ａｕ矿化体，Ａｕ含量最高１．５ｇ／ｔ。马鹿沟水化学异常区使用水系沉积物测量进行异常追踪，迅速缩小了找矿“靶区”。使用重矿物测量在“靶区”内进一步追踪发现了Ａｕ矿化源。在此基础上经大比例尺土壤测量辅以岩石剖面测量，圈出了一个有望找到火山岩型浅成热液金矿床的成矿远景区。
In this paper, an example is given to introduce the geochemical exploration work method of hydrochemical anomaly verification in the basalt area of Ji Nan. Comprehensive study of the existing geological conditions, that Ji’an along the village, Malu gully chemical abnormalities in the favorable geological conditions. Combined with the characteristics of micro-landscape, mercury gas was used to measure the distribution of fault zone in the zone within 2km2 of the anomaly area along the Yangtze River. Rock profiles, soil measurements show that the structure experienced hydrothermal mineralization activities, mineralization body buried deep. According to soil measurement results to verify the target area. The result of drilling verification shows Au mineralized body nearly 30m thick below surface 620m with the highest Au content of 1.5g / t. The marsh water chemical anomaly area used anomalous water sediment measurements to track down the prospecting area quickly. Au mineralization was discovered by further tracking of heavy mineral measurements in the “target zone.” On this basis, a large-scale soil survey supplemented by lithospheric cross-section surveys has drawn a prospect of prospecting for the ore-forming prospect of the volcanic epithermal gold deposits.