Presentation Information
[R6P-03]Zircon U-Pb ages of the plutonic rocks in the eastern part of the Abukuma Mountains
*Masumi Mikoshiba1, Yutaka Takahashi1, Kazuya Kubo1, Tohru Danhara2, Hideki Iwano2, Takafumi Hirata3 (1. AIST, 2. Kyoto Fission-Track Co. Ltd., 3. Univ. Tokyo Sci.)
Keywords:
Plutonic rocks,Abukuma Belt,Kitakami Belt,U-Pb age,zircon
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U-Pb age dating of zircon for the plutonic rocks in the eastern part of the Abukuma Mountains was carried out. Zircon U-Pb ages of granitic rocks in the Abukuma Belt are 112 Ma and 104 Ma (medium-grained hornblende-biotite granodiorite), 109 Ma (medium-grained pink biotite granite), and 112 Ma (medium to fine-grained biotite granite). As for the granitic rocks in the Kitakami Belt, zircon U-Pb ages are 118 Ma (Kunimiyama Granodiorite) and 112 Ma (Hochijoishiyama Granite).
U-Pb age dating of zircon for the plutonic rocks in the eastern part of the Abukuma Mountains was carried out. Zircon U-Pb ages of granitic rocks in the Abukuma Belt are 112 Ma and 104 Ma (medium-grained hornblende-biotite granodiorite), 109 Ma (medium-grained pink biotite granite), and 112 Ma (medium to fine-grained biotite granite). As for the granitic rocks in the Kitakami Belt, zircon U-Pb ages are 118 Ma (Kunimiyama Granodiorite) and 112 Ma (Hochijoishiyama Granite).