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UV激光40Ar/39Ar显微探针技术能对含钾矿物进行微区分析, 测定其年龄剖面, 真实地反映Ar同位素在矿物晶体内的分布, 拓展了常规40Ar/39Ar年代学的应用领域. 本文对新疆皮山煌斑岩中金云母进行了常规40Ar/39Ar阶段升温和UV激光40Ar/39Ar微区分析对比, 结果显示金云母内Ar同位素分布均匀, 激光微区分析结果与阶段升温结果一致. 使用激光微区分析系统能准确测定矿物颗粒内的年龄剖面, 为经历复杂热历史的样品提供了一种新的40Ar/39Ar微区年代学研究方法.
The 40Ar / 39Ar microprobe technique of UV laser can micro-analyze the potassium-bearing minerals and determine the age profile of them, which can truly reflect the distribution of Ar isotopes in the mineral crystals and broaden the application fields of the conventional 40Ar / 39Ar chronology. The conventional 40Ar / 39Ar stage heating and the UV 40Ar / 39Ar microarray analysis of phlogopite in the mountainous lamprophyre of Pishan, Xinjiang are carried out. The results show that the Ar isotopic distribution in the phlogopite is uniform and the result of laser microanalysis is consistent with that of the stage heating. Using laser microanalysis system to accurately measure the age profile in mineral grains provides a new method for 40Ar / 39Ar microchronology research for samples experiencing complex thermal history.