低硫化物浅成热液金矿床地球物理特征及勘探方法  

Geophysical Characters of Low SulphidationEpithermal Au Deposits and Exploration Methods

作　　者：白大明[1] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037

出　　处：《内蒙古地质》2000年第2期51-55,共5页Geology of Inner Mongolia

摘　　要：低硫化物浅成热液金矿床是全世界许多矿业公司的勘探对象。它们往往产在一组石英脉中并以此为中心形成蚀变包壳 ,成矿温度 15 0℃2 5 0℃。矿化作用及有关蚀变使主岩中的磁铁矿被破坏产生退磁作用 ,并形成诸如冰长石、伊利石、明矾石等含钾矿物。蚀变带分布面积有时达数平方公里 ,可利用高分辨率航空磁测及放射性测量探测到。一些典型的低硫化物浅成热液矿床具有独特的地球物理特征 ,且这些特征与成矿后覆盖层及矿化带的侵蚀程度有关 ,因此综合地球物理方法是勘查此类矿床(特别是隐伏半隐伏矿床 )Low sulphidation epithermal Au deposits are commonly hosted by quartz vein systems that were formed at temperatures in the range of 150°250℃ giving rise to major alteration halos Gold mineralization is closely associated with the destruction and redistribution of magnetite in the host rocks and the formation of various Kbearing minerals such as adularia, illite and alunite These alteration halos can often cover an area of at least several square kilometers and have thecharacters to be detected during reconnaissance geological surveys utilizing high resolution aeromagnetic and airborne radiometric sensors

关 键 词：低硫化物浅成热液金矿床 热液蚀变 高分辨率航空磁测 航空放射性测量 重力异常 

分 类 号：P618.51[天文地球—矿床学]