K-Ar dating of volcanic rocks younger than 10 ka . toward understanding of eruptive history in Quaternary volcanoes

我们试图将Cassignol-Gillot （CG）方法引入山形大学的K-Ar测年设施，以测定日本东北部较年轻的火山岩。为此，我们安装了质谱仪的气体萃取线；为气体膨胀增加可变体积。我们确认了CG法的样品选择和制备步骤。选取合适的岩样进行CG方法在Nasu-Chausudake火山和Iwaki火山的有效性测试。用CG法测定K-Ar年龄将有助于确定第四纪火山的喷发历史。

We are tried to introduce the Cassignol-Gillot (CG) method to K-Ar dating facility in the Yamagata University, in order to date younger volcanic rocks in northeastern Japan. To achieve this, we installed the gas extraction line of the mass spectrometer; adding a variable volume for gas expansion. We confirm the procedures of sample selection and preparation for CG method. We selected suitable rock samples to test effectiveness of the CG method from Nasu-Chausudake Volcano and Iwaki Volcano to applying the CG method. K-Ar dating with CG method will be able to contribute establishing eruptive history in Quaternary volcanoes.