飯豊・朝日山地稜線部にみられる完新世中期のテフラとその山地斜面編年上の意義について
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概要
- 論文の詳細を見る
Two fine vitric tephra layers of middle Holocene age are recognized in peaty surface soil on Mt. Tide. The lower one is identified as the Kikai-Akahoya ash (K-Ah, about 6, 300y.B.P.) on the basis of type, refractive index, and major element chemical composition of volcanic glass shards and <SUP>14</SUP>C age. The upper one is called the Azuma ash (Az) and has some similarities to Towada-Chuseri ash (To-Cu, about 5, 400y.B.P.), although further inspection is necessary.<BR>Az can be seen at many localities on the Tide and Asahi Mountains. These tephras, especially Az, would be useful in chronological study of slope formation in these areas.
- 社団法人 東京地学協会の論文