摘要
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。
With practical examples,the present paper has expounded the geochemical prospecting method for investigating and verifying hydrochemical anomalies in the basalt-covered area of southern Jilin.An integrated study of the available geological data shows that geological conditions of the Yanjiangcun and Malugou hydrochemical anomalous districts in southem Jilin are favorable for mineralization.Combined with microlandscape characteristics and applying mercury-vapor survey,the authors delineated the extension of the fault structural zone in an area of 2km2 within the Yanjiang anomalous district.Rock profile and soil survey show that the structure has experienced hydrothermal mineralization and the mineralized body is buried at a rather great depth.On the basis of soil survey,the target area for verification was selected through optimization,and then a gold mineralized body 30m in thickness was revealed by drilling below the depth of 620m,with the highest Au content being 1.5g/T.In the Malugou hydrochemical anomalous district,follow-up for anomaly was conducted by means of stream sediment survey and,as a result,the'target area'for ore prospecting was rapidly reduced. Further follow -up work in the'target area'by means of heavy mineral survey led to the discovery of gold mineralization source.On such a basis,a metallogenic prospect area in which a volcanic epithermal gold deposit is likely to be found was delineated through large-scale soil survey combined with rock survey.
出处
《物探与化探》
CAS
CSCD
1996年第6期429-437,共9页
Geophysical and Geochemical Exploration
关键词
金矿床
矿化
玄武岩
水化学异常
basalt -covered area
investigation and verification of hydrochemical anomaly
Yanjiangcun
Malugou.