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Unpublished K-Ar dates measured in the Geochronology laboratory of Yamagata University : Rocks from the Abukuma Highland in Nihonmatsu area, Fukushima Prefecture

Iwata Naoyoshi Kanno Fumiyuki Saito Kazuo 山形大学

2020.02.28

概要

This report presents K-Ar dating results for biotite separates of granites from the Abukuma Highland in Nihonmatsu area, Fukushima Prefecture, as measured at the geochronology laboratory of Yamagata University. The K-Ar dates of rocks from a batholith-like plutonic body (Gd) were 111-105 Ma. The K-Ar dates of rocks from neighboring small plutonic bodies (Gr2 and Gr3) are, respectively,102 - 99 Ma and 93 - 90 Ma. The K-Ar dating result of ca. 74 Ma from Gr4 in the Dake-Onsen area is apparently 20 - 30 m.y. younger. The spatiotemporal distribution of K-Ar dates portrays the sequence of timing by which each plutonic rock reached the biotite closure temperature during the cooling process.

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