The Northern Yatsugatake volcanoes occupy the northern part of the Yatsugatake volcanic chain, central Japan. According to the geological and the petrographical studies, the volcanic products of the Northern Yatsugatake volcanoes are grouped into the four volcanic units such as Kasuga, Nijinotaira, Fukinotaira and Tateshina
We determined K-Ar ages and whole-rock chemistry for volcanic rocks from Azumaya volcano and the surrounding area of central Japan, in order to reexamine its volcanic history. Based on our chronological and petrological study, coupled with previous geological data, we reconstructed the volcanic history of the volcano.
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