三陸沖海底コアＫＨ９４‐３，ＬＭ‐８の後期更新世テフラ層序

• 青木 かおり

  北海道大学大学院地球環境科学研究科

• 新井 房夫

書誌事項

タイトル別名

• Late Quaternary Tephrostratigraphy of Marine Core KH94-3, LM-8 off Sanriku, Japan.
• サンリクオキ カイテイ コア KH94 3 LM 8 ノ コウキ コウシン セイ テフラソウ ジョ

抄録

A piston core (KH94-3, LM-8) was collected from the continental slope off the Sanriku district, east coast of northeast Japan. This core contains 14 tephra layers, the lowest of which is Aso-4. Identification of these tephras, based on the chemical compositions of the volcanic glass and the reflective indices of glass shards and minerals, indicate that there are widespread tephra from distal volcanoes in the Kyushu, Chugoku, and Hokkaido areas, as well as from the several volcanoes in the Tohoku district adjacent to the Sanriku.<br>There are some drift pumices (diameters are about 3-5mm) which accompanied two tephra layers in the LM-8 core- the Shikotsu-Daiichi and Towada-Hachinohe tephras. This is the first finding of drift pumice in the Shikotsu-Daiichi tephra.<br>The oxygen isotopic curve of the core LM-8 is so similar to the standard oxygen isotopic curve in the open ocean that the eruption ages of each of 14 tephras can be determined by the oxygen isotopic stratigraphy. We compared these ages with the calendar years converted from ¹⁴C ages on land of 4 tephra layers-Towada-Chyuseri, Towada-Hachinohe, Towada-Ofudo, and Shikotsu-Daiichi. There was close agreements between oxygen isotopic ages and converted ¹⁴C ages.

収録刊行物

• 第四紀研究

  第四紀研究 39 (2), 107-120, 2000

  日本第四紀学会

キーワード

• テフラ層序
• 海底コア
• 酸素同位体比層序
• 十和田火山
• 暦年代

詳細情報

• CRID: 1390282681473689088
• NII論文ID: 10004720130
• NII書誌ID: AN0034136X
• DOI: 10.4116/jaqua.39.107
• ISSN: 18818129
• ISSN: 04182642
• ISSN: http://id.crossref.org/issn/04182642
• NDL書誌ID: 5333550
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5333550
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可