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Two mica clay minerals in clay veins developed in Hiroshima granitic rock and, Takada rhyolitic rock distributed in Hiroshima Prefecture were dated by K-Ar method. The age of both minerals are 68.4 m.y. and 79.5 m.y. respectively. The ages of mica clay minerals are similar to that of the Hiroshima granitic rocks (70-91 m. y.). This result may be suggested that the mica clay minerals found in both host rocks are formed by hydrothermal solution subsequent to the post granitic activity.

K-Ar ages of mica clay minerals in clay veins found in granitic and rhyolitic rocks of Hiroshima prefecture,Japan.