[ Top ] [ Japanese ]

Hirayu Complex (Otsuka, 1986) Otsuka, 1988

Invalid synonym: Hirayu Belt, Hirayu Group, Nyukawa Olistostrome

• Type locality: Osobudani valley - Kaishodni valley - Osudani valley, Okuhidaonsengo, Takayama city, Gifu prefecture
• Accretionary complex
• Deposition (Limestone): Early - Late Permian (Fusulinids)
• Deposition (Chert): Permian - Early Jurassic
• Deposition (Siliceous mudstone): Middle Jurassic (Radiolarians)
• Accretion: Middle Jurassic
• Correlation: Funafuseyama Unit
• Intruded by: Kaishio Source Vent

• Sedimentary facies: Marine
• Lithofacies: Mélange facies
• Matrix: Mudstone, Siltstone
• Exotic blocks (Crusts, Slabs): Sandstone, Chert, Limestone, Basalt

• Distribution (Width): 4 - 8 km
• Upper limit: Thrust fault, Unconformity (Fukuji Tuff Breccia)
• Lower limit: Thrust fault

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Osobudani valley - Kaishodni valley - Osudani valley - Waridani valley - Sodegatani valley - Konabedani valley - Hirayugawa river - Mount Aboyama, Okuhidaonsengo, Takayama city, Gifu pref.; Shirahone, Azumi, Matsumoto city, Nagano pref.
• Fossils (Limestone): Fusulinids
• Fossils (Radiolarians): Eucyrtidiellum unumaense, Mirifusus cf. guadalupensis, Tricolocapsa? fusiformis, Tricolocapsa plicarum, Trillus sp.

• Yamakita and Otoh (2000) Structural Geology, vol.44, pp.5-32
• Nakano et al. (1995) Geology of the Norikuradake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 139p. (in Japanese with English abstract 4p.)
• Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)