广东韶关某地找矿的多种地球物理方法综合应用  

The comprehensive application of several geophysical methods in mineral exploration in Guangdong,Shaoguan

作　　者：薛融晖[1,2] 王光杰[1] 底青云[1] 李帝铨[3] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学院研究生院,北京100049 [3]中南大学信息物理工程学院,长沙410083

出　　处：《地球物理学进展》2011年第4期1364-1371,共8页Progress in Geophysics

基　　金：中国科学院知识创新工程重大项目(KZCX1-YW-15-4)资助

摘　　要：综合地球物理方法可以发挥各种勘探方法的优势,补充单一方法的不足,并且对于单一方法无法解释的异常给出新的理论支持.依据地质资料,位于广东省韶关始兴良源矿区成矿母岩主要为黑云母花岗岩,以及黑云母花岗岩蚀变后形成的白云母花岗岩或云英岩化花岗岩.母岩在电性上均体现为高电阻率;另一方面,高电阻率的花岗岩一般具有低磁性的特征,而围岩里,中高电阻率的硅化破碎带的高磁性会比较突出,这些特征都可以在勘探中体现出来.因此,在该地区进行了激电法(IP),地面高精度磁测以及CSAMT野外实际测量,并根据得到的处理结果给出了测区范围内综合方法的实测研究.激发极化法圈定了三个极化率高值异常带,走向均和测线大角度相交,并和出露的矿脉位置相吻合.其中两个也体现为高磁异常带.处理结果圈定了研究区域内三处异常区.并且对于不同的地球物理方法,得到的结果是吻合的.结合本区的已有地质资料,这种吻合是可信的.从而给出的地质意义解释比较可靠.The integral application of geophysical methods could complement the flaw of the single method without damaging its advantages. It is on the leading place in Geophysical domain and presents new theoretical support to phenomena which can＇t be explained by single geophysical method. This article shows the surveying study of integral methods using survey result of CSAMT, IP and Magnetic Method on some place mid-north in Guangdong. CSAMT is the abbreviation of Controlled-source Audio Magnetotelluric, which is a geophysical method that mainly in mineral and groundwater exploration. While in CSAMT, the use of human controlled source could wonderfully reduce errors and suppress noise. Generally, it could find anomalous bodies buried in less than about 2 km deep and different geoelectric structure. IP and Magnetic Method are all useful geophysical techniques in mineral and ground structure exploration. As a result, integrally we use these three methods to reach the aim that makes the conclusion more reliable. Basing on successfully field work, in different methods we draw anomalous body or structure on the curve or the contour. It proves that the abnormities got by three means in different areas tallying with each other. This tally is reliable combining with the known geological material. Therefore, the explanation about the geological signification is reliable too.

关 键 词：综合地球物理 激发极化法 磁法测量 可控源音频大地电磁法 

分 类 号：P631[天文地球—地质矿产勘探]