大東海嶺群海域海盆の形成・堆積史

• 樋口 雄

  株式会社地球科学総合研究所

• 柳本 裕

  株式会社地球科学総合研究所

• 神田 慶太

  石油天然ガス・金属鉱物資源機構

書誌事項

タイトル別名

• Development and Sedimentary Process of Basins in the Daito Ridges Area
• 大東海嶺群海域海盆の形成・堆積史 : 北大東海盆,奄美三角海盆,南大東海盆の比較
• ダイトウカイレイグン カイイキカイボン ノ ケイセイ ・ タイセキシ : ホクダイ トウカイボン,アマミ サンカクカイボン,ミナミダイトウカイボン ノ ヒカク
• ―北大東海盆，奄美三角海盆，南大東海盆の比較―
• A Comparison among the Kita-Daito, Amami-Sankaku, and Minami-Daito Basins

抄録

 Some small basins have developed in the northern Philippine Sea along the northern and southern sides of the Daito Ridge (DR): the Kita-Daito Basin (KDB), Amami-Sankaku Basin (ASB) and Minami-Daito Basin (MDB). From the interpretation of multichannel reflection seismic profiles crossing these basins, their noticeable differences of geological character can be recognized. There are several E–W trending normal faults in the main part of the KDB which suggest that this basin was formed by seafloor spreading. A seismic section crossing the Oki-Daito Ridge (ODR) and DR presents a reflector, possibly indicating subduction of the slab containing the ODR. The subduction probably caused back-arc spreading of the KDB, which finally ceased upon the collision of both ridges. Based on the trace of characteristic reflectors in seismic sections and correlations with several drill holes, sediments are divided into Units I through V, ranging from Lower Eocene to Holocene. The Choju Seamounts occupy the middle part of the MDB, dividing the basin into the eastern main basin and the western small subbasin (Minami-Daito Nishi Sub Basin; MDNSB). The seismic character of Unit II (≒ Middle to Upper Eocene) is noticeably different among the ASB, the main basin of MDB, and the MDNSB, indicating different sources of sediments. The thickness of Unit II in the ASB increases towards the Kyushu-Palau Ridge (KPR), indicating that sediments were supplied by the KPR. Unit II in the main basin of MDB has no direct relationship with the KPR, and should have had another source, such as the DR or the ODR. The thickness of Unit II in the MDNSB increases towards the DR, suggesting an equivalent origin of the carbonate layer at the top of the DR.

収録刊行物

• 地学雑誌

  地学雑誌 124 (5), 829-845, 2015

  公益社団法人 東京地学協会

キーワード

• 大東海嶺
• 北大東海盆
• 南大東海盆
• 奄美三角海盆
• 九州・パラオ海嶺
• 地震探査

詳細情報

• CRID: 1390001204236630528
• NII論文ID: 130005107814
• NII書誌ID: AN00322536
• DOI: 10.5026/jgeography.124.829
• ISSN: 18840884
• ISSN: 0022135X
• NDL書誌ID: 026824832
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I026824832
• Web Site: https://www.jstage.jst.go.jp/article/jgeography/124/5/124_124.829/_pdf
• 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