槍・穂高連峰に分布する最低位ターミナルモレーンの形成年代

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タイトル別名
  • Chronological Significance of the Late Pleistocene Marker Tephra on the Lowest Terminal Moraine in the Yari-Hotaka Range, Nothern Japanese Alps
  • 槍・穂高連峰に分布する最低位ターミナルモレーンの形成年代(短報)
  • ヤリ ホタカ レンポウ ニ ブンプスル サイ テイイ ターミナル モレーン ノ

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抄録

The Yokoo, Ninomata, and Ichinomata moraines, which are located in the Yari-Hotaka Range, Northern Japanese Alps, constitute the lowest moraine systems of the Yokoo glacial age (the Ichinomata stage) which has been considered the greatest glacial advance in the Yari-Hotaka Range (Iozawa, 1962, 1972, 1979; Ito, 1982a, b; Ito and Vorndran, 1983). The recent trenching of the surface deposits of these moraines revealed the occurrence of the marker tephra, the Omachi-E pumice (Tateyama volcano), in the volcanic ash layer directly covering the uppermost till of the Ichinomata moraine. The total thickness of the volcanic ash layer overlying the till is 120cm, and the horizon of the Omachi-E pumice is about 115cm below the ground surface. The marker tephra was identified by the examination of petrographic properties, such as heavy mineral composition and refractive indices of glass, orthopyroxene, and hornblende. According to the inferred age of the Omachi-E pumice (Machida and Arai, 1979; Machida, 1980), the age of the greatest glacial advance in the Yokoo glacial (the Ichinomata stage) is estimated to be a little older than 60, 000 y. B. P.

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