Zircon U-Pb and reassessed zircon fission track ages of Miocene Mizunami and Iwamura Groups in the southeastern part of Gifu Prefecture, central Japan

Here U-Pb and reassessed fission track (FT) ages are presented for samples from the Miocene Mizunami and Iwamura groups in the southeastern Gifu Prefecture, central Japan. The U-Pb ages of three tuff samples coincide with the reassessed FT ages within the error range. These new U-Pb and reassessed F...

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Bibliographic Details
Published inThe Journal of the Geological Society of Japan Vol. 124; no. 2; pp. 141 - 150
Main Authors Sasao, Eiji, Danhara, Tohru, Iwano, Hideki, Hirata, Takafumi
Format Journal Article
LanguageEnglish
Japanese
Published The Geological Society of Japan 15.02.2018
Subjects
Gifu Prefecture
Iwamura Group
Miocene
Mizunami Group
U-Pb age
zircon
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Summary:Here U-Pb and reassessed fission track (FT) ages are presented for samples from the Miocene Mizunami and Iwamura groups in the southeastern Gifu Prefecture, central Japan. The U-Pb ages of three tuff samples coincide with the reassessed FT ages within the error range. These new U-Pb and reassessed FT ages are consistent with those reported in previous microfossil and paleomagnetic studies, which indicate the following depositional history: The Hongo and Akeyo formations of the Mizunami Group were deposited at ~19-18 Ma and ca. 18 Ma, respectively, and the lower part of the Toyama Formation of the Iwamura Group was deposited ca. 18 Ma.
ISSN:0016-7630
1349-9963
DOI:10.5575/geosoc.2017.0067