History of Azuma Volcano based on K–Ar age determinations.

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  • Matsumoto Akikazu
    AIST, Geological Survey of Japan, Research Institute of Earthquake and Volcano Geology
  • Nakano Shun
    AIST, Geological Survey of Japan, Research Institute of Earthquake and Volcano Geology
  • Furukawa Ryuta
    AIST, Geological Survey of Japan, Research Institute of Earthquake and Volcano Geology
  • Yamamoto Takahiro
    AIST, Geological Survey of Japan, Research Institute of Earthquake and Volcano Geology

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  • K–Ar 年代に基づく吾妻火山の形成史
  • K-Ar ネンダイ ニ モトズク アズマ カザン ノ ケイセイシ

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Abstract

<p>Azuma Volcano, located in Yamagata and Fukushima prefectures, is a large composite Quaternary volcano group. K–Ar ages by the isotope dilution method were determined for 38 lava samples. The volcano consists mainly of lava flows which have mostly similar petrographic characteristics. According to the determined age data, the volcanic edifice was divided into 12 units including Holocene Jododaira Volcano. The volcanic activity of Azuma Volcano began at ca. 1200 ka from the east and migrated to the west, and at ca. 700 ka, reversely migrated to the east. The latest activity is occurring at Jododaira Volcano. There is no long dormancy during the activity of Azuma Volcano from ca. 1200 ka to the present.</p>

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