Rock magnetic properties of the Gardar Drift sedimentary sequence, Site IODP U1314, North Atlantic: Implications for bottom current change through the mid-Pleistocene

T. Kanamatsu, M. Ohno, G. Acton, H. Evans, Y. Guyodo

研究成果: ジャーナルへの寄稿学術誌査読

8 被引用数 (Scopus)

抄録

The sediment obtained at Integrated Ocean Drilling Program (IODP) Site U1314 on the Gardar Drift in the eastern flank of the Reykjanes Ridge was analyzed using rock magnetic techniques to study the depositional environment through the mid-Pleistocene climate transition. The study area is under the influence of Iceland-Scotland Overflow Water (ISOW). Consequently, the sedimentary record represents directly ISOW behavior over time. A change in the depositional environment was documented as magnetic property changes that are the result of changes in concentration and grain size of magnetic minerals, both of which decrease upward from around 0.9 Ma. Because these shifts are accompanied by a change in magnetic fabrics, which is interpreted as a change in bottom current directions from E-W to NNE-SSW, it is considered that the sedimentation pattern inferred from magnetic records at the site was modified by a change in the bottom current through the middle Pleistocene.

本文言語英語
ページ(範囲)31-39
ページ数9
ジャーナルMarine Geology
265
1-2
DOI
出版ステータス出版済み - 9月 1 2009

!!!All Science Journal Classification (ASJC) codes

  • 海洋学
  • 地質学
  • 地球化学および岩石学

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