中部更新統金剛地層の堆積環境とシーケンス層序学的解析

• 奈良 正和

  千葉大学理学部地球科学教室 地質調査所資源エネルギー地質部

書誌事項

タイトル別名

• Depositional Environments and Sequence Stratigraphic Analysis of the Middle Pleistocene Kongochi Formation.
• チュウブ コウシントウ コンゴウ チソウ ノ タイセキ カンキョウ ト シーケ

抄録

Sequence stratigraphic analysis of the Middle Pleistocene Kongochi Formation (Kazusa Group) and the bottom part of the overlying Jizodo Formation (Shimosa Group) distributed in the Boso Peninsula, Japan was made, based on the recognition of the facies stacking pattern and stratigraphic discontinuity. The Kongochi Formation consists of three shallowing-upward facies successions. The lower, middle and upper successions are made up of, respectively, outer shelf to upper shoreface, inner shelf to lower shoreface, and inner shelf to salt marsh sediments. The lower succession is interpreted to be an upper segment of a depositional sequence (maximum thickness 270 m), of which lower one is the underlying outer shelf deposits of the upper part of the Kasamori Formation, and to represent highstand systems tract. The others constitute two depositional sequences whose maximum thickness are 43 m and more than 23 m, in ascending order. As the upper part of the Kazusa, and Shimosa Groups were said to be formed under the strong influence of 5th to 6th order glacio-eustatic sea-level changes, the overall upward-shallowing and thinning pattern among the sequences may reflect decreasing of accomodation spaces possibly induced by longer-term (i.e. 4th or 5th order) sea-level falling.

収録刊行物

• 地学雑誌

  地学雑誌 107 (1), 77-91, 1998

  公益社団法人 東京地学協会

キーワード

• 堆積相解析
• シーケンス層序
• 中部更新統
• 金剛地層

詳細情報

• CRID: 1390282679207505280
• NII論文ID: 10002237176
• NII論文ID: 10017458499
• NII書誌ID: AN00322536
• DOI: 10.5026/jgeography.107.77
• ISSN: 18840884
• ISSN: 0022135X
• NDL書誌ID: 4423173
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4423173
• 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