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

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

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ep%26s...53...45k&link_type=abstract

Earth, Planets and Space, Volume 53, p. 45-54.

Physics

2

Scientific paper

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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