The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
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Fission-track ages of the Pliocene strata in the Shinjo Basin, Yamagata Prefecture
Shunji Moriya, Tohru Danhara, Hideki Iwano, Tohru Yamashita, Takeshi Nakajima, Kiyotaka Chinzei
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Keywords: fission-track dating, Pliocene strata, Shinjo Basin, Yamagata
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2008 Volume 114 Issue 1 Pages 1-15

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Abstract
Fission-track dating was carried out for 18 tuff samples from the Pliocene strata in the Shinjo Basin, Yamagata Prefecture. After examination has been made to eliminate erroneous data by contamination of reworked zircon crystals, ages of the boundaries between the Nakawatari, Sakekawa, Yamuke and Motoaikai Formations are determined to be 4.3, 3.7 and 3 Ma, respectively.
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© 2008 by The Geological Society of Japan
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