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[SGL18-P03] Zircon U-Pb ages from sedimentary rocks of the Mino Belt in Gifu and Nagano Prefectures, Central Japan
Keywords:Mino Belt, Jurassic, Zircon, U-Pb age
The Mino Belt in central Japan consists mainly of Jurassic to early Cretaceous accretionary complexes (Wakita, 1988). Owing to the establishment of microfossil stratigraphy using radiolarians, lithology and age of the Mino Belt have been clarified in detail (e.g., Wakita, 1988, Otsuka, 1988). Regional correlation of the Mino Belt with the Tamba and Ashio Belts, and Jurassic accretionary complexes in China and Russia has been discussed (e.g., Nakae, 2000). In recent years, zircon U–Pb ages in clastic rocks have been extensively studied to compare with other geological belts. However, there are still very few studies on zircon U–Pb dating in the Mino Belt, compared to other areas such as Jurassic accretionary complexes in China and Russia. In this study, zircon U–Pb ages from clastic rock samples at five sites in the Mino Belt are newly reported. This will be used as basic data for high-accuracy regional correlation of the Mino Belt with other geological belts.
Samples were collected from the equivalent formation of the Mino Balt in the Toki-Tajimi area, the Kanayama Unit in the Mino area, the Hirayu Complex in the Takayama area, and the Sawando and Misogawa Complexes in the Kiso area. Although tentative, a cluster age of 149.5±5.4 Ma was obtained from the sample in the Toki-Tajimi area, and the youngest age of 160.0±9.7 Ma was obtained from the one in the Kanayama Unit. In addition, zircon U–Pb ages from clastic rocks of the Hirayu, Sawando, and Misogawa Complexes will be reported.
This study was funded by the Ministry of Economy, Trade and Industry, Japan as part of its R&D supporting program titled “Establishment of Technology for Comprehensive Evaluation of the Long-term Geosphere Stability on Geological Disposal Project of Radioactive Waste (JPJ007597) (Fiscal Years 2023).”
This study was funded by the Ministry of Economy, Trade and Industry, Japan as part of its R&D supporting program titled “Establishment of Technology for Comprehensive Evaluation of the Long-term Geosphere Stability on Geological Disposal Project of Radioactive Waste (JPJ007597) (Fiscal Years 2023).”
[reference]
Nakae, S., 2000, Mem. Geol. Soc. Japan., 55, 73-98.
Otsuka, T., 1988, Jour. Geosci. Osaka City Univ., 31, 63-122.
Wakita, K., 1988, Bull. Geol. Surv. Japan, 39, 675-757.
Samples were collected from the equivalent formation of the Mino Balt in the Toki-Tajimi area, the Kanayama Unit in the Mino area, the Hirayu Complex in the Takayama area, and the Sawando and Misogawa Complexes in the Kiso area. Although tentative, a cluster age of 149.5±5.4 Ma was obtained from the sample in the Toki-Tajimi area, and the youngest age of 160.0±9.7 Ma was obtained from the one in the Kanayama Unit. In addition, zircon U–Pb ages from clastic rocks of the Hirayu, Sawando, and Misogawa Complexes will be reported.
This study was funded by the Ministry of Economy, Trade and Industry, Japan as part of its R&D supporting program titled “Establishment of Technology for Comprehensive Evaluation of the Long-term Geosphere Stability on Geological Disposal Project of Radioactive Waste (JPJ007597) (Fiscal Years 2023).”
This study was funded by the Ministry of Economy, Trade and Industry, Japan as part of its R&D supporting program titled “Establishment of Technology for Comprehensive Evaluation of the Long-term Geosphere Stability on Geological Disposal Project of Radioactive Waste (JPJ007597) (Fiscal Years 2023).”
[reference]
Nakae, S., 2000, Mem. Geol. Soc. Japan., 55, 73-98.
Otsuka, T., 1988, Jour. Geosci. Osaka City Univ., 31, 63-122.
Wakita, K., 1988, Bull. Geol. Surv. Japan, 39, 675-757.