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Okurayama Quartz Diorite

Invalid synonym: Tokoroku type Quartz Diorite

• Plutonic rocks
• Early Cretaceous
• Intruded by: Hachijoishiyama Granite, Tamanoyu Granodiorite, Ohisagawa Granodiorite, Diorite porphyry, Biotite hornblende tonalite
• Intruded in: Biotite hornblende quartz diorite

• Lithofacies: Biotite hornblende quartz diorite

• Distribution (East-West): 6 km
• Distribution (South-North): 6 km

• Distribution: Mount Okura, Tomioka city, Futaba county, Fukushima pref.; Mount Hagitsuka - Gomaizawa, Kawauchi city, Futaba county, Fukushima pref.; Yakijiku - Sarukobu - Mount Higashiomori, Namie city, Futaba county, Fukushima pref.; Nogami river - Tamanoyu hot spring, Okuma city, Futaba county, Fukushima pref.

• Kubo et al. (2002) Geology of the Kawamae and Ide District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 136p. (in Japanese with English abstract 6p.)
• Kubo et al. (1994) Geology of the Namie and Iwaki-Tomioka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 7p.)