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Kojima et al. 2001

Kojima, T., Okada, M., Ohira, H., Tokieda, K., Komuro, H. and Amano, K. (2001). Paleomagnetism and fission-track ages of Oki-Dogo Island in Southwest Japan. Earth Planets and Space 53(1): 45-54.

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+ or -1.3 and 20.0+ or -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 degrees. The Oki Trachyte-Rhyolite has the same average geomagnetic direction as the present day value. These results show that a clockwise rotation of 40+ or -15 degrees of the Oki-Dogo Island occurred between 17 and 6.8 Ma which is similar to the main land of southwest Japan.

BACKGROUND DATA FILES

	Abstract

	Table 1
	Table 2
	Table 3
	Table 3b

	Fission-Track Dating
	Paleomagnetism

Keywords
Asia, Cenozoic, Far East, fission tracks, geochronology, Honshu, igneous rocks, Japan, Kori Formation, lower Miocene, magnetization, Miocene, natural remanent magnetization, Neogene, Oki Islands, Oki-Dogo Island, paleomagnetism, pyroclastics, remanent magnetization, Shimane Japan, southwestern Japan, Tertiary, Tokibariyama Formation, tuff, volcanic rocks, 05A Igneous and metamorphic petrology, 03 Geochronology

Journal
Earth Planets and Space