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Middle tonalite

• Plutonic rocks
• Oligocene (37 Ma, U-Pb)
• Intruded in: Upper Hidaka Metamorphic Rocks of greenschist facies and amphibolite facies

• Lithofacies: Biotite tonalite, Muscovite-Biotite tonalite, Cordierite-muscovite-biotite tonalite
• Lithofacies (Minor): Hornblende-biotite tonalite

------ Transitional, ~~~~~~ Intrusive, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: central Hokkaido

• Takahashi et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.6, pp.399-411 DOI