ミランコビッチ・サイクルに伴う環境変動に対する海生貝類の応答様式

• 北村 晃寿

  静岡大学理学部地球科学教室

書誌事項

タイトル別名

• Responses of marine molluscs to environmental changes caused by Milankovitch cycle
• ミランコビッチ サイクル ニ トモナウ カンキョウ ヘンドウ ニ タイスル カ

抄録

The middle part of the early Pleistocene Omma Formation (1.5-1.0Ma) is composed of eleven depositional sequences caused by glacio-eustatic sea-level changes associated with Milankovitch cycles (41, 000-year orbital obliquity). Each depositional sequence contains inner shelf sediments of transgressive and high-stand systems tracts. Within each depositional sequence the molluscan fauna changes from cold-water associations to warm-water associations, followed again by cold-water associations. On the basis of detailed stratigraphic distributions of molluscs and planktonic foraminifers, the following events can be recognized during the warming interval from a glacial stage to an interglacial stage : 1. initiation of inflow of the warm Tsushima Current into the Japan Sea, 2. local extinction of cold-water molluscs, 3. absence of both cold-and warm-water molluscs, 4. successful migration of warm-water molluscs. The absence of both elements may have been caused by high seasonal fluctuations of water temperature associated with the unstable inflow of the Tsushima Current.

収録刊行物

• 化石

  化石 63 (0), 40-48, 1997

  日本古生物学会

詳細情報

• CRID: 1390282679410756736
• NII論文ID: 110002704253
• NII論文ID: 10003621710
• NII書誌ID: AN00041606
• DOI: 10.14825/kaseki.63.0_40
• ISSN: 24242632
• ISSN: 00229202
• NDL書誌ID: 4381714
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4381714
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可