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Paleomagnetism and fission-track ages of Oki-Dogo Island in Southwest Japan

Earth, Planets and Space volume 53, pages 45–54 (2001)Cite this article

Abstract

Zircon fission-track (F.T.) ages and paleomagnetic directions were measured on the Neogene series of the Oki-Dogo Island. The results of F.T. dating on the the Tokibariyama Formation show ages of 23.7 ± 1.3 and 20.0 ± 2.3 Ma, indicating the early Early Miocene. Paleomagnetic measurements of the Tokibariyama, Kori Formations (24–17 Ma) and the Oki Trachyte-Rhyolite (6.8 Ma) were done to reveal the movement of Oki-Dogo Island during the Japan Sea opening. The Tokibariyama and Kori Formations show an average declination of 39.9°. The Oki Trachyte-Rhyolite has the same average geomagnetic direction as the present day value. These results show that a clockwise rotation of 40° ± 15° of the Oki-Dogo Island occurred between 17 and 6.8 Ma which is similar to the main land of southwest Japan.

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Authors and Affiliations

  1. Department of Environmental Sciences, Ibaraki University, Mito, 310-8512, Japan

    Takeshi Kojima, Makoto Okada & Kazuo Amano

  2. Department of Geoscience, Shimane University, Matsue, 610-8504, Japan

    Hiroto Ohira, Katsuyasu Tokieda & Hiroaki Komuro

Authors
  1. Takeshi Kojima
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  2. Makoto Okada
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  3. Hiroto Ohira
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  4. Katsuyasu Tokieda
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  5. Hiroaki Komuro
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  6. Kazuo Amano
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Correspondence to Takeshi Kojima.

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Kojima, T., Okada, M., Ohira, H. et al. Paleomagnetism and fission-track ages of Oki-Dogo Island in Southwest Japan. Earth Planet Sp 53, 45–54 (2001). https://doi.org/10.1186/BF03352361

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  • DOI: https://doi.org/10.1186/BF03352361

Keywords

  • Mudstone
  • Late Miocene
  • Clockwise Rotation
  • Natural Remanent Magnetization
  • Isothermal Remanent Magnetization