[ Top ] [ Japanese ]

Mizunashigawa Metamorphic Rocks Chihara and Nishida, 1968

Invalid synonym: Mizunashigawa Group

• Type locality: Mizunashi river, Minamiuonuma city, Niigata prefecture
• High P/T metamorphic rocks
• Deposition: before Permian?
• Correlation: Renge Metamorphic Rocks?
• Intruded by: Tadamigawa Younger Granites, Daikura Granite, Andesite dike

• Metamorphic facies: Greenschist
• Metamorphic facies: Contact metamorphism
• Lithofacies: Garnet biotite muscovite schist, Biotite muscovite schist, Biotite schist, Quartz schist
• Lithofacies (Protolith): Mélange facies
• Lithofacies (Protolith): Pelitic rocks
• Lithofacies (Protolith, Minor): Greenstones (Basalt, Gabbro, Mafic tuff), Ultramafic rocks, Chert, Limestone, Sandstone

• Distribution: ca. 15 x 6 km², ca. 5 x 2 km²
• Upper limit: Unconformity (Sakadoyama Sandstone and Shale Member, Hakkaisan Formation)

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

• Distribution: Udazawa river, Hirohori - Mizunashi river, Minamiuonuma city, Niigata pref.; Mount Mijogatake - Shiori toge - Lake Okutadami - Otori creek, Uonuma city, Niigata pref.

• Takahashi et al. (2004) Geology of the Suhara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 80p. (in Japanese with English abstract 4p.)
• Chihara and Komatsu (1992) Geology of the Hakkaisan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 8p.)
• Yanagisawa et al. (1985) Geology of the Tokamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 6p.)