湖南衡阳盆地第四纪沉积物对地气测量的影响

Effect of Quaternary Sediments of Hengyang Basin,Hunan on Geo-gas Prospecting

地气法是瑞典科学家K.Christiansson和L.Malmqvist在20世纪80年代初提出的,是一种很有前景的找矿方法。该方法介绍到中国后,经过地质研究人员不懈地研究,取得了很大的进步。然而由于对其形成机理和迁移过程了解的匮乏,限制了该方法的实际应用。通过对湖南衡阳盆地第四纪沉积物样品模拟地气迁移实验和透射电镜观察,查明了沉积物中吸附纳米金的矿物有纤铁矿、针铁矿、高岭石、埃洛石等。这些矿物是地气测量的主要影响因素。研究结果可应用于我国热带亚热带地区金属矿床的找矿实践。

Geogas survey,found by K. Cristiansson and L. Malmqvist in 1980＇s,is a potential mean for geochemical exploration in covered regions and has been studied since it was introduced into China. A lot of improvements have been made in China as efforts by many geochemists. However,little knowledge about its formation and lack of standard procedures limited its application in practical mineral exploration. Through the simulation experiments of geo-gas migration for the quaternary sediment samples and the TEM observation, it is identified that the minerals more easily adsorbing nano-gold are lepidocrocite, goethite, kaolinite, halloysite and so on. These minerals are the main factors that affect the migration. This research can he applied into the ore prospecting of metal deposits in the tropical or sub-tropical region of China. Keywords Geogas-carried nano-gold, Quaternary sediments, Migration, Geo-gas prospecting