激光Ar/Ar微区定年的应用及展望

⁴⁰Ar/³⁹Ar定年中，存在一些使用传统的大样逐步升温技术难以处理的难题，如变质及沉积岩样品常含有多期次矿物而难以获得理想结果，过剩Ar在样品中的分布以及来源问题一直难以有效解决，根据缓慢冷却钾长石的⁴⁰Ar/³⁹Ar年龄谱提出的热演化模型也因为Ar在矿物中扩散机制的不明确性而不断受到质疑。20世纪90年代将紫外激光（UV-laser）成功引入⁴⁰Ar/³⁹Ar年代学分析后，为解决这些难题提供了一种思路。借助激光微区

In situ laser 40Ar/39Ar dating: application and prospect

In ⁴⁰Ar/³⁹Ar dating,there are some purposes that step heating technical can not reached. Such as in dating metamorphic rocks,it is hard to pick up pure sample if several generation minerals existed,or what is the excess ⁴⁰Ar distribution and where are they come from,or how to resolve the argumentation about the MDD molding with the Ar diffusion mechanism in silicate obscurely. High spatial resolution laser ⁴⁰Ar/³⁹Ar dating technique is a unique tool to probe Ar distribution of micron size in minerals directly. Using this technique,We can see the vibration of Ar isotope in minerals directly without separated mineral,and can get the Ar distribution information in minerals which is very powerful evidence for explain the Ar diffusion mechanism. It helps us to understand tectonic process and mold our aging data more exactly. Anyway,UVLaser ⁴⁰Ar/³⁹Ar dating will be more and more important in the future.