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本文是对海绿石用于作钾氩法绝对年龄测定的初步尝试。一方面,从方法上对海绿石的分选,海绿石中放射性成因氩的测量进行了研究;另一方面,探讨了陆源杂质的存在对所得年龄值的影响,测绘了海绿石的氩析出曲线,测定了两个景儿峪组的海绿石样品的绝对年龄。由实验结果得知:(1)、海绿石样品中大量年老的长石质陆源杂质的存在会使所得年龄值异常偏高。(2)、海绿石在真空加热过程中,200℃以前大约有10.2%的Ar析出,600℃全部Ar析完。(3)、两样品实测年龄值,一个为9.60—9.87亿年,一个为5.25—5.27亿年。作者对比了前人的资料,在文中对实验结果进行了讨论。基于这一工作在国内还刚开始,许多问题还有待进一步探讨。
This article is a preliminary attempt to determine the absolute age of glauconite by potassium-argon method. On the one hand, from the method of sorting the glauconite, the radioactive genesis of argon in glauconite was studied; on the other hand, the influence of terrigenous impurities on the age value was discussed, Argon precipitation curves were used to determine the absolute age of the samples of glauconite from two Jing’eryu formations. The experimental results show that: (1) The presence of a large number of aged feldspar terrigenous impurities in the samples of glauconite will result in abnormally high age values. (2) In the process of vacuum heating, glauberite is precipitated by about 10.2% Ar before 200 ° C, and all the Ar contents are completed at 600 ° C. (3) The measured values of two samples, one is 9.60-9.87 billion years, one is 5.25-527 million years. The author compares the data of the predecessors, and discusses the experimental results in this paper. Based on this work has just begun in the country, many issues have yet to be further explored.