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Higashiakaishi mass

Invalid synonym: Higashiakaishi Unit, Higashiakaishi peridotite mass

• High P/T metamorphic rocks
• Solid intruded mantle material into Sanbagawa metamorphic rock
• Correlation: Kamikabuto mass, Kumogahara mass, Nishiakaishi mass, Imono mass

• Metamorphic facies: Eclogite facies
• Lithofacies (Protolith): Cumulate rock composed of garnet lherzolite
• Lithofacies (Protolith): Garnet peridotite, Garnet clinopyroxinite
• Lithofacies (Protolith, Minor): Garnet clinopyroxinite, Garnet rock, Garnet websterite, Wehrlite

• Thickness: 400 m
• Distribution (East - West): ca. 5 km
• Distribution (South - North): ca. 1.5 km
• Upper limit: Thrust fault
• Lower limit: Thrust fault

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

• Distribution: Mount Maeakaishiyama - Nikubuchidani valley - Shirinashigawa river, 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