[ Top ] [ Japanese ]
Middle Unit
- High P/T metamorphic rocks
- Protolith: Northern Shimanto Belt
- Deposition: Late Cretaceous, Campanian - Maastrichtian (78 - 65 Ma)
- Metamorphism: Late Cretaceous - late Paleogene (68.8 - 56.2 Ma, K-Ar)
- Metamorphic zones: Biotite zone, Garnet zone
- Lithofacies: Spotted pelitic schist
- Lithofacies (Minor): Spotted quartz schist, Psammitic schist, Greenschist
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ayukawa - Sanbagawa, Fujioka city, Gunma pref.
- Takagi et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.7, pp.305-324, DOI
- Otoh et al. (2010) Jour. Geol. Soc. Japan, vol.119, No.2, pp.333-346 DOI
- Arai et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.5, pp.223-241 DOI
- Okubo and Horiguchi (1969) Geology of the Mamba District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 65p. (in Japanese with English abstract 5p.)