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Irahara Granodiorite

Invalid synonym: Irawara Granodiorite

• Type locality: Fukuoka prefecture
• Plutonic rocks
• Early Cretaceous (98.1, 97.0 Ma, Rb-Sr; 103.1 Ma, U-Pb)
• Intruded by: Yusubaru Granite
• Intruded in: Tagawa Metamorphic Rocks

• Lithofacies (Hornblende porphyritic facies): Hornblende biotite tonalite, Granodiorite (Megacryst of hornblende)
• Lithofacies (Main facies): Hornblende biotite tonalite, Biotite granite

• Distribution: Northeastern part of Soeda Granodiorite
• Upper limit: Unconformity (Kitasakamoto Formation)

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

• Distribution: Asakura region, Fukuoka pref.

• Yuhara et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.6, pp.405-420 DOI