Japan Geoscience Union Meeting 2014

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Oral

Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG61_2AM1] Petrology, Mineralogy and Resource Geology

Fri. May 2, 2014 9:00 AM - 10:45 AM 311 (3F)

Convener:*Toshiaki Tsunogae(Faculty of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba), Koichiro Fujinaga(Department of Systems Innovation, School of Engineering, University of Tokyo), Akira Miyake(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Nobutaka Tsuchiya(Department of Geology, Faculty of Education, Iwate University), Chair:Toshiaki Tsunogae(Faculty of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba), Nobutaka Tsuchiya(Department of Geology, Faculty of Education, Iwate University)

9:15 AM - 9:30 AM

[SCG61-02] Petrology and zircon geochronology of the Hikami Granitic Rocks in south Kitakami Mountains,Japan

*Jun SASAKI1, Nobutaka TSUCHIYA1, Tatsuro ADACHI2, Nobuhiko NAKANO2, Yasuhito OSANAI2, Yoshiko ADACHI3 (1.IwateUniversity, 2.KyushuUniversity, 3.NiigataUniversity)

Keywords:HikamiGranites, zircon, U-Pb age, Petrochemistry

The Hikami Granites,pre-Cretaceous older granitic complex of the South Kitakami Terrane,has long been controversial on their age of intrusion. Since unconformable relationship between the granites and the Silurian formation was shown by Murata et al.(1974). However CHIME age determinatin for the grainites (Adachi et al.,1994),indicates Silrian to Permian age.We examined the zircon U-Pb ages of 13 samples from the Hikami Granitic Rocks, and solidification age of around 450Ma were obtained. Bulk rock chemical compositions of the Hikami granites were compared with Paleozoic granitic rocks in Japan. Petrochemical similarity between Hikami Granitic Rocks and the granitic rocks in the Kurosegawa Belt is consistent with the correlation between the South Kitakmi and Kurosegawa Belts.