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同位素地质年龄标准样的建立,是一项重要的基础工作,它在检查和比较各种实验流程,衡量各种定年方法的可信度,标定同位素稀释剂等方面,都是必不可少的。从1977年初开始,我国同位素地质标准样小组着手建立K-Ar法标准样。为了外检,笔者曾将ZBH-25黑云母、ZBJ角闪石带到澳大利亚国立大学地球科学院进行测定。这两个样品的K-Ar稀释法年龄、~(40)Ar/~(39)Ar坪年龄及~(40)Ar/~(39)Ar等时年龄的一致性表明,这些矿物结晶以后,未受过热的挠动,也不存在过剩氩,是作标准样的理想样品。本文还介绍样品中放射成因~(40)Ar的析出特征,并指出~(40)Ar可能有两种存在状态,它们各具不同的晶格能。
The establishment of isotopic geological age standards is an important basic work that is essential for examining and comparing various experimental processes, for measuring the confidence of various dating methods, and for calibrating isotopic diluents. Since early 1977, our country’s isotope geological standards group set about establishing K-Ar standard samples. For inspection, I had ZBH-25 biotite, ZBJ amphibole brought to the Australian National University Institute of Earth Sciences for determination. The K-Ar dilution ages, the ~ (40) Ar / ~ (39) Ar plate ages and the isochron age of ~ (40) Ar / ~ (39) Ar for these two samples indicate that after these minerals crystallized, Not overheating of the flexible, there is no excess argon, is the ideal sample for the standard sample. This paper also introduces the precipitation characteristics of radiogenic ~ (40) Ar in the sample and points out that there may be two existing states of ~ (40) Ar, each with different lattice energies.