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Okuyama Tonalite (Matsuda, 1976) Hattori et al., 1983

Invalid synonym: Okuyama Granodiorite

• Plutonic rocks
• late Eocene - early Oligocene
• Intruded by: Porphyrite dikes, Rhyolite dikes
• Intruded in: Takahata Granite

• Lithofacies: Biotite hornblende tonalite

• Distribution (East - West): 2 km
• Distribution (South - North): 1.5 km

• Distribution: Okuyama - Takahata - Hamahara, Misato city, Ochi county, Shimane pref.

• Hattori et al. (1983) Geology of the Sambesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 168p. (in Japanese with English abstract 7p.)