[ Top ] [ Japanese ]

Koboke Unit

Synonym: Koboke Formation

• High P/T metamorphic rocks
• Protolith: Northern Shimanto Belt
• Deposition: Late Cretaceous (76 - 74 Ma, U-Pb)
• Metamorphism: Paleocene (65 - 62 Ma, K-Ar)

• Metamorphic facies: Chlorite
• Lithofacies: Psammitic schst
• Lithofacies (Minor): Pelitic schist, Siliceous schist, Conglomeratic schsit

• Upper limit: Oboke Fault
• Lower limit: Thrust fault

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

• Distribution: Oboke valley - Iyagawa river - Minawa, Miyoshi city, Tokushima pref.

• Noda et al. (2021) Geology of the Ikeda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 150p. (in Japanese with English abstract 5p.)
• Otoh et al. (2010) Jour. Geol. Soc. Japan, vol.119, No.2, pp.333-346 DOI
• Okamoto et al. (2009) Jour. Geol. Soc. Japan, vol.115, Supplement, pp.37-49 DOI
• Aoki et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.5, pp.171-183 DOI