瀬戸内海沿岸域の湿原堆積物から得られた最終氷期の地磁気永年変化

• 峯本 須美代

  神戸大学大学院自然科学研究科 現:伊丹市立伊丹高校

• 兵頭 政幸

  神戸大学内海域機能教育研究センター・理学部地球惑星学科

• 成瀬 敏郎

  兵庫教育大学社会系

書誌事項

タイトル別名

• A Geomagnetic Secular Variation Record for the Last Glacial Period, Reconstructed from Coastal Bog Sediments on the Inland Sea of Japan.
• Geomagnetic Secular Variation Record for the Last Glacial Period Reconstructed from Coastal Bog Sediments on the Inland Sea of Japan

抄録

A paleomagnetic secular variation record of geomagnetic field direction for the time span from 25 to 16ka was obtained from oriented bog sediment samples in a coastal area of the eastern Inland Sea, Japan. The plot of this secular variation record, combined with Holocene secular variation data, shows that a long-term westerly declination feature began after 16ka and ended at 7.5ka. This feature lasted more than 4, 000 years and less than 8, 500 years. The declinations at 25-16ka are dominated by easterly values, and no westerly declination was observed in the time span of 24-19.5ka. The inclinations at 25-16ka are characterized by slightly shallow values with small amplitude changes, compared to those in the Holocene. Prior to 18ka a large clockwise looping was dominant in the motion of the geomagnetic vector, while counter-clockwise rotations were dominant after it. Many features of secular variation in the last glacial period have the potential to yield good age constraints for use in paleomagnetic dating.

収録刊行物

• 第四紀研究

  第四紀研究 38 (5), 377-386, 1999

  日本第四紀学会

キーワード

• Paleomagnetism
• geomagnetic secular variation
• the last glacial period
• bog sediment

詳細情報

• CRID: 1390001206496108544
• NII論文ID: 10004721031
• NII書誌ID: AN0034136X
• DOI: 10.4116/jaqua.38.377
• ISSN: 18818129
• ISSN: 04182642
• NDL書誌ID: 4860855
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4860855
• 本文言語コード: en
• 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