飛騨山脈・白馬岳東麓，北股入流域で新たに得られた未固結堆積物の14C年代

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タイトル別名
  • New Radiocarbon Ages from Unconsolidated Deposits in the Kitamatairi River Basin, the Eastern Mount Shirouma-dake, Central Japan
  • ヒダ サンミャク シロウマダケ トウロク キタマタイリ リュウイキ デ アラタニ エラレタ ミコケツ タイセキブツ ノ 14C ネンダイ

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 The Kitamatairi River basin has been considered to be a type-location of Pleistocene multiple glaciations of the northern Hida Mountains, central Japan. However, recent geomorphological studies performed in the adjacent area have clarified that the landforms and unconsolidated deposits both of which have been believed to be of glacial origin (i.e., moraines and tills) were deformed or actually formed by landslides. This suggests that both morphogenetic and chronologic reappraisals of landforms and deposits are also necessary in the Kitamatairi River basin. Hence, we measured new radiocarbon ages of unconsolidated deposits in the Kitamatairi River basin (replications for 7 samples from 2 sites and new measurements for 9 samples from 7 sites). All replications showed significant older ages (>20 ky) than previously reported ages. New ages range from late Holocene to late Pleistocene, or before. The chronological concept for landform development in the Kitamatairi River basin should be revised.

収録刊行物

  • 地学雑誌

    地学雑誌 117 (3), 650-660, 2008

    公益社団法人 東京地学協会

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