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Iratsu mass

• High P/T metamorphic rocks
• Tectonic blocks of metamorphosed plutonic rocks originated from lower crust - upper mantle, and sedimentary rocks from accretionary complexes.

• Metamorphic facies: Eclogite facies
• Lithofacies (East): Garnet-bearing meta-gabbro
• Lithofacies (East, Minor): Peridotite
• Lithofacies (West): Garnet-bearing mafic gneiss
• Lithofacies (West, Minor): Peridotite, Diopside-Hornblende amphibolite, Psammitic-pelitic gneiss, Siliceous geniss

• Distribution (East - West): ca. 7 km
• Distribution (South - North): ca. 2 km
• Upper limit: Thrust fault
• Lower limit: Thrust fault

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

• Distribution: Mount Gongenyama - Mount Ebirayama - Mount Futatsudake, 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