[ Top ] [ Japanese ]

Nakashichiban Unit

• High P/T metamorphic rocks
• Deposition: Late Cretaceous
• Metamorphism: Late Cretaceous (77 Ma, Ar-Ar)
• Correlation: Oboke Unit

• Metamorphic facies: Pumpellyite-Actinolite (Peak temperature: 300 degree C)
• Lithofacies: Psammitic schist, Pelitic schist

• Thickness: 400 m or thicker
• Upper limit: Thrust fault
• Lower limit: Thrust fault

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

• Distribution: Nakashichiban, Niihama city, Ehime pref.

• Aoya et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.7, pp.491-514 DOI
• Aoya et al. (2013) Geology of the Niihama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 181p. (in Japanese with English abstract 3p.)