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Chuzenji-type Acidic Rocks Yanai, 1972

Invalid synonym: Chuzenji Quartz Porphyry

• Plutonic rocks
• Late Cretaceous - Eocene (K-Ar, Ar-Ar)
• Intruded in: Kobugahara Granodiorite, Ashio Belt

• Lithofacies: Welded tuff, Rhyolite, Granite, Quartz monzonite

• Distribution: Noromata - Mikouchi river - Fukazawa creek, Ashio town, Nikko city, Tochigi pref.

• Ito et al. (2022) Geology of the Kiryu and Ashikaga District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
• Yoshikawa et al. (2010) Geology of the Utsunomiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 6p.)
• Kawata and Ozawa (1955) Ashio, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 7p.)