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Kotozawa Igneous Rocks Nagamori et al., 2010

Invalid synonym: Himekawa Metamorphic Rocks

• Type locality: Kotozawa, Oyachi, Itoigawa city, Niigata prefecture
• Volcanic rocks
• Blocks in Mushikawa Formation surrounded by faults.
• Devonian (416 Ma, U-Pb; 165? Ma, K-Ar)
• Intruded by: Andesite dykes

• Metamorphic facies: Greenschist
• Lithofacies: Gabbro, Dolerite, Basalt

• Distribution: a few m x 100 m - 200 m x 500 m

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Kotozawa, Oyachi - river mouth of Omigawa river, Itoigawa city, Niigata pref.

• Nagamori et al. (2018) Geology of the Itoigawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 75p. (in Japanese with English abstract 3p.)
• Nagamori et al. (2010) Geology of the Kotaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 130p. (in Japanese with English abstract 4p.)
• Takeuchi et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.123-142 DOI