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Nakaoku tuffite dikes

Invalid synonym: Nakaoku Formation

• Volcanic vent of Omine-Odai caldera
• Ring dike associated with Omine-Odai caldera
• Intrusive rocks
• Miocene (16.0, 13.7 Ma, FT)
• Intruded in: Wasabidani Complex, Okutamadani Complex

• Sedimentary facies: Arc-shaped pyroclastic dike
• Lithofacies: Rhyolite
• Lithofacies (ca. 8.5 m): Lapilli tuff (Tuffite)
• Lithofacies (0.3 - 2 m): Coarse tuff
• Lithofacies (ca. 15.5 m): Fine tuff

• Width: ca. 70 m
• Distribution (North to South): ca. 20 km
• Distribution (East to West): ca. 15 km
• Distribution: along boundary fault of northern margin of the caldera

• Distribution: Hibora valley, Nakaoku, Kawakami city, Yoshino county, Nara pref.

• Kitajima and Wada (2010) Jour. Geol. Soc. Japan, vol.116, no.9, pp.510-521 DOI
• Yamashita et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.7, pp.340-352 DOI
• Miura and Wada (2007) Jour. Geol. Soc. Japan, vol.113, no.7, pp.283-295 DOI