| 激光显微探针~(40)Ar/~(39)Ar同位素定年 |
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| 引用本文： | 穆治国.激光显微探针~(40)Ar/~(39)Ar同位素定年[J].地学前缘,2003,10(2):301-307. |
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| 作者姓名： | 穆治国 |
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| 作者单位： | 北京大学,地球与空间科学学院,北京,100871 |
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| 摘 要： | 已有 5 0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。40 Ar/ 3 9Ar分步加热释氩法是常规K Ar定年法的发展 ,它克服了常规K Ar定年法的一些局限 ,又可以测定岩浆构造热事件。激光显微探针40 Ar/ 3 9Ar定年法是在 2 0世纪末把聚焦激光束应用在40 Ar/ 3 9Ar分步加热释氩法中而发展起来的一种定年方法。它既具有常规K Ar定年法和40Ar/ 3 9Ar分步加热释氩法的所有优越性 ,又把定年引入微观领域。特别是在 2 0世纪的最后几年 ,以激光显微探针40 Ar/ 3 9Ar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的里程碑。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 ,使之解决的地质问题更广泛和深入 ,并且开始冲击着地球科学中的某些热点和难点课题。
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| 关 键 词： | 激光显微探针定年 Ar年代学 新的里程碑 |
| 文章编号： | 1005-2321(2003)02-0301-07 |
| 修稿时间： | 2002年10月15 |
THE LASER MICROPROBE 40Ar/39Ar DATING METHOD |
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| MU Zhi,guo.THE LASER MICROPROBE 40Ar/39Ar DATING METHOD[J].Earth Science Frontiers,2003,10(2):301-307. |
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| Authors: | MU Zhi guo |
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| Abstract: | 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 used for 50 years. 40 Ar/ 39 Ar step heating dating method was developed from the conventional K Ar method. There are some advantages of 40 Ar/ 39 Ar dating over conventional K Ar dating and a geothermal event may be analyzed by 40 Ar/ 39 Ar dating. The laser microprobe 40 Ar/ 39 Ar dating ,a new dating method, was founded on the basis of the conventional 40 Ar/ 39 Ar dating method since a focused laser beam was applied in geochronology. The advantages of both conventional K Ar and 40 Ar/ 39 Ar dating methods were inherited while it made dating into the microcosmic field. Within the latest few years of the twentieth 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 be used in both micro area and a single grain, extends dating limit into the historical realm. Application range of K Ar geochronology is getting bigger and bigger due to fine analytical techniques for solving geological problems are getting wider and wider. It is a milestone in the geochronological history. A lot of "hotpot" and puzzle are being struck by the new dating method in Earth science. |
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| Keywords: | laser microprobe dating K Ar geochronology new milestone |
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