20世纪末激光显微探针定年把K-Ar年代学推向了新的里程碑  

The Laser Microprobe Dating Drives K-Ar Geochronology into A New Milestone at the End of 20th Century

作　　者：穆治国[1] 高永军[1] 

机构地区：[1]北京大学地质学系,北京100871

出　　处：《北京大学学报（自然科学版）》2001年第1期136-142,共7页Acta Scientiarum Naturalium Universitatis Pekinensis

摘　　要：已有 50年历史的K Ar定年法 ,由于过剩Ar和Ar丢失的普遍发现 ,使其最广泛的应用面临着严重挑战。在 2 0世纪的最后几年 ,以激光显微探针4 0 Ar/ 39Ar定年方法的完善和精度的提高为标志 ,把K Ar年代学研究推向了一个新高度。微区微量高精度高分辨定年 ,把定年时限扩展到人类历史范畴 ,精细的分析技术拓宽了年代学的应用范围 。K\|Ar age dating method is facing a serious challenge to its application due to that both Ar loss and Ar excess are widespread found even though it has been undergoing 50 years.In the latest few years of the 20th century,studies on K\|Ar geochronology have been pushing on a new step as a sign of method perfected and precision enhanced.High precision and high resolution 40 Ar/ 39 Ar dating,can use in both micro\|area and a single grain,extends dating limit into the historical realm.Applied range of K\|Ar geochronology is getting bigger and bigger due to fine analytical techniques while solved geological problems are getting wider and wider.

关 键 词：激光显微探针定年 K-AR年代学 20世纪末 地质年代学 放射衰变体系 定年时限 

分 类 号：P533[天文地球—古生物学与地层学]