日高山脈北部七ッ沼カールの融氷河流堆積物と恵庭a火山灰

• 澤柿 教伸

  北海道大学大学院地球環境科学研究院

• 松岡 直子

  北海道大学大学院地球環境科学研究科

• 岩崎 正吾

  北見工業大学

• 平川 一臣

  北海道大学大学院地球環境科学研究院

書誌事項

タイトル別名

• Fluvioglacial Sediments and Eniwa-a Tephra in the Nanatsu-numa Cirque Area, Northern Hidaka Range, Hokkaido, Japan
• ヒダカ サンミャク ホクブ ナナ ッヌマ カール ノ ユウヒョウガリュウ タイセキブツ ト エニワ a カザンバイ

抄録

 One of the key sites of late Quaternary glaciations in the Hidaka Range is the Nanatsu-numa cirque area where glacial landforms and sediments can be correlated with the key marker tephra, En-a (17–18ka), which allow glacier extent and fluctuations around the LGM to be examined precisely. This site has been identified as a type locality for defining two stadials, Poroshiri Stadial (older) and Tottabetsu Stadial (younger), during the last glaciation in this area. We made a detailed description of the stratified sediments interpreted as glaciofluvial deposits, located immediately below the Nanatsu-numa cirque. We discovered that: (a) these deposits formed the proximal part of glacier terminus; (b) En-a is included in all layers of sediment to a depth of 15 m; and (c) several boulder layers show cyclical debris flow sedimentation facies, which were probably due to En-a covering the glacier surface causing a sudden ice melt. Consequently, all stratified sediments at this site were deposited during the younger stadial of the last glaciation in the vicinity of the glacial terminus.

収録刊行物

• 地学雑誌

  地学雑誌 121 (2), 252-268, 2012

  公益社団法人 東京地学協会

キーワード

• 日高山脈
• 第四紀後期の氷河作用
• ポロシリ亜氷期
• トッタベツ亜氷期
• 融氷河流
• はぎ取り地層標本

詳細情報

• CRID: 1390001204238472448
• NII論文ID: 10031146373
• NII書誌ID: AN00322536
• DOI: 10.5026/jgeography.121.252
• COI: 1:CAS:528:DC%2BC38Xhs1Cqt73P
• ISSN: 18840884
• ISSN: 0022135X
• NDL書誌ID: 023765309
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I023765309
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可