中期更新世広域テフラＮｇ‐１と飛騨地域に分布する高山軽石層との対比

• 田村 糸子

  東京都立大学大学院理学研究科

• 鈴木 毅彦

  東京都立大学大学院理学研究科

書誌事項

タイトル別名

• Correlation between Middle Pleistocene Widespread Tephra Ng-1 and Takayama Pumice Layer Distributed in the Hida District, Central Japan.
• チュウキ コウシン セイ コウイキ テフラ Ng 1 ト ヒダ チイキ ニ ブンプ スル タカヤマ カルイシソウ ト ノ タイヒ

抄録

Ng-1 (0.30Ma) is a widespread tephra covering the Tokai, Kinki, and Shikoku areas, and the location of its source vent is assumed to be in the Hida Mountains. However, the existence of proximal deposits of this tephra has not been confirmed around the vent. At the same time, a pumice fall deposit named the Takayama Pumice Layer (Tky) has been distributed in and around the Takayama Basin, west of the Hida Mountains. Some previous studies identified Tky as one of the Omachi A Tephra Layers (APms: 0.33-0.40Ma) derived from a volcano in the Hida Mountains. However, other studies concluded that Tky was derived from the Hakusan Volcano, about 45km west of the Takayama Basin.<br>This study clarifies that Ng-1 is correlated to Tky, not to APms, and assumes that the source is most likely to be in the Hida Mountains. The following similarities confirm the correlation between Ng-1 and Tky: mineral assemblage, refractive indices of the volcanic glass, hornblende and orthopyroxene, and the chemical composition of titanomagnetite. Moreover, the distributions of Ng-1 and Tky are limited in the southwest area of the Hida Mountains.<br>The age of Ng-1 is estimated by previous works to be 0.30Ma, which means that Tky provides a significant datum plane of 0.30Ma around the Takayama Basin.

収録刊行物

• 第四紀研究

  第四紀研究 40 (4), 295-305, 2001

  日本第四紀学会

キーワード

• 中期更新世
• 飛騨山脈
• テフラ対比
• Ng-1,
• 高山軽石層

詳細情報

• CRID: 1390282681473807232
• NII論文ID: 10007431216
• NII書誌ID: AN0034136X
• DOI: 10.4116/jaqua.40.295
• ISSN: 18818129
• ISSN: 04182642
• NDL書誌ID: 5868136
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5868136
• 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