The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
A fission-track age from the Katsurane Facies in the Tentokuji Formation at Hanekawa, Akita. Northeast Japan
Takeshi Nakajima, Tohru Danhara, Hideki Iwano, Tohru Yamashita
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Keywords: Akita
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2003 Volume 109 Issue 4 Pages 252-255

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Abstract
Fission-track dating was carried out on zircon crystals in a pumice obtained from a tuffbed in the Katsurane Facies in the Tentokuji Formation at Hanekawa, Akita City. As a result, the first reliable radiometric age of 4.4±0.6 Ma (2σ) was obtained for the tuffbed. The result supports the correlation between the Katsurane Fades distributed on surface outcrops and that distributed in offshore sub-surface wells.
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