K-Ar ages of the Kannabe Volcano Group and the adjacent basaltic monogenetic volcanoes, east San-in district

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  • 山陰東部,神鍋火山群及び近傍の玄武岩質単成火山のK-Ar年代
  • サンイン トウブ カンナベ カザングン オヨビ キンボウ ノ ゲンブガンシツ

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Abstract

K-Ar ages of 21 Quaternary basaltic rocks from the Kannabe Volcano Group and adjacent monogenetic volcanoes in the east San-in district were determined. In the Kannabe Volcano Group, the oldest ages, 0.7Ma, were gotten from the Nishiki Volcano. There was a long rest (about 0.5 Ma) of the volcanic activity after the eruption of the Nishiki Volcano. After that, from 0.22 Ma to recent, 6 volcanoes, if including adjacent volcanoes, 9 volcanoes, erupted intermittently. The east San-in district is the most active district of the basaltic volcanism in the San-in and Chugoku area, southwest Japan, in the present day.

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