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Gongen mass

• High P/T metamorphic rocks
• Metamorphism: Late Cretaceous (120 - 110 Ma, U-Pb)
• Tectonic blocks of sedimentary rocks originated from accretionary complexes.

• Metamorphic facies: Eclogite facies
• Lithofacies (Protolith): Interbedded pelitic rocks and basic clastic rocks.
• Lithofacies: Quartz eclogite, Psammitic-Pelitic gneiss

• Distribution: 100 x 800 m²
• Upper limit: Thrust fault
• Lower limit: Thrust fault

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

• Distribution: Gongen valley, Niihama city, Ehime pref.

• 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.)
• Sakurai and Takasu (2009) Jour. Geol. Soc. Japan, vol.115, no.3, pp.101-121 DOI