Correlation of the Early Pleistocene Tugm Tephra Bed in the Niigata region and Kd18 Tephra Bed in the Boso Peninsula to the Ashino Pyroclastic Flow Deposit in the Aizu region, northeast Japan

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  • 新潟地域の月岡ゴマシオテフラ層および房総半島のKd18テフラ層と会津地域の芦野火砕流堆積物との対比
  • 新潟地域の月岡ゴマシオテフラ層・房総半島のKd18テフラ層と会津地域の芦野火砕流堆積物との対比
  • ニイガタ チイキ ノ ツキ オカ ゴマシオテフラソウ ボウソウ ハントウ ノ Kd18 テフラソウ ト アイズ チイキ ノ アシノ カサイリュウ タイセキブツ ト ノ タイヒ

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The early Pleistocene Tugm Tephra Bed in the Niigata region and the Kd18 Tephra Bed in the Boso Peninsula were correlated to the Ashino Pyroclastic Flow Deposit in the Aizu region. They contain bubble-junction type glass shards and high quartz in common. Chemical composition of glass shard and orthopyroxene (Mg#=63.6-66.0) of these tephra is also coincident. These tephras are expected to be found as marker beds in Japan.<br>

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