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Tonaru mass

Invalid synonym: Tonaru meta-gabbro mass

• High P/T metamorphic rocks (1.5 GPa, 700 - 730 degree C)
• Tectonic blocks of metamorphosed plutonic rocks originated from lower crust - upper mantle

• Metamorphic facies: Eclogite facies
• Lithofacies (Protolith): Layered gabbro
• Lithofacies: Garnet-bearing meta-gabbro
• Lithofacies (Minor): Diopside-Hornblende amphibolite

• Distribution (East - West): ca. 6 km
• Distribution (South - North): ca. 300 - 800 m
• Upper limit: Thrust fault
• Lower limit: Thrust fault

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

• Distribution: Tonaru - Hiuradanigawa river - Upper stream of Kokuryogawa 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