[ Top ] [ Japanese ]

Imajo Complex (Hattori and Yoshimura, 1982) Nakae et al., 2013

Invalid synonym: Imajo Formation, Magatoji Formation

• Type locality: Imajo, Minamiechizen city, Nanjo county, Fukui prefecture
• Accretionary complex
• Deposition (Limestone): middle Permian
• Deposition (Chert): middle Triassic - Middle Jurassic
• Deposition (Siliceous mudstone): Early - Middle Jurassic
• Deposition (Mudstone): Early - Middle Jurassic (Radiolarians)
• Correlation: Samondake Unit, Oshimatadani Unit, Kuzu Complex, Unit 3
• Correlation: Sumaizuku Unit

• Sedimentary facies: Marine
• Lithofacies: Coherent facies (Chert-clastic sequence), Broken facies
• Lithofacies (Upper): Interbedded sandstone and mudstone, Mudstone
• Lithofacies (Middle): Siliceous mudstone, Mudstone
• Lithofacies (Lower): Chert, Mafic rocks

• Thickness: ca. 600 - 2,600 m
• Thickness (Upper): 1,400 m or thinner
• Thickness (Middle): ca. 1,000 - 1,600 m
• Thickness (Lower): ca. 250 - 1,000 m
• Distribution (East - West): ca. 12 km
• Distribution (South - North): ca. 500 - 1,500 m
• Upper limit: Thrust fault (Yunoo Complex)
• Lower limit: Thrust fault (Tokuyama Complex)

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

• Distribution: Imajo - Hiuchi - Sugenotani - Kuki - Seto - Kochi - Furuki - Oguradani - Seto - Akadanigawa river - Tarumigawa river - Kokuradani valley - Imogadairagawa river, Minamiechizen city, Nanjo county, Fukui pref.; Uryuno, Echizen city, Fukui pref.; Mino region, Gifu pref.
• Fossils (Fusulinids): Neoschwagerina cf. margaritae, Neoschwagerina minoensis, Yabeina cf. kotoi, Yabeina cf. ozwai

• Nakae et al. (2015) Geology of the Kanmuri Yama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 107p. (in Japanese with English abstract 3p.)
• Nakae et al. (2013) Geology of the Imajo and Takenami District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 110p. (in Japanese with English abstract 4p.)
• Sano et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.6, pp.321-340 DOI
• Yamakita and Otoh (2000) Structural Geology, vol.44, pp.5-32
• Kawai (1964) Neo, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 66p. (in Japanese with English abstract 12p.)