[ Top ] [ Japanese ]

Unazuki Metamorphic Rocks Hiroi, 1974

Invalid synonym: Unazuki zone, Eboshiyama Group

• Type locality: Unazuki, Kurobe city, Toyama prefecture
• Collision type metamorphism by the subduction of Yangtze plate under Sino-Korea plate
• Intermediate metamorphic rocks
• Protolith: Rift sediments
• Deposition: Late Carboniferous (Brachiopods)
• Metamorphism: Early Triassic (250 Ma; 240 - 212 Ma, K-Ar; 496, 248 Ma, Rb-Sr)
• Correlation: Sugorokudani Crystalline Schist?
• Intruded by: Unazuki Granite, Otodani Gabbro, Funakawa Granite, Yatazodani Quartz Diorite

• Metamorphic facies: Chloritoid zone, Staurolite-Biotite zone, Kyanite-Biotite zone, Sillimanite zone
• Lithofacies (Protolith): Continental shelf limestone, Basalt, Rhyolite
• Lithofacies: Mafic schist, Felsic schist, Calcareous schist
• Lithofacies (Upper): Interbedded mafic schist and psammitic-pelitic schist
• Lithofacies (Middle): Quartz-feldspar schist
• Lithofacies (Lower): Pelitic schist
• Lithofacies (Bottom): Crystalline limestone

• Upper limit: Thrust fault (Hida Gneiss)

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

• Distribution: Uchiyama - Ototani - Unagawa dam - Mount Eboshiyama - Mount Oitsurushiyama - Kurimushi, Unazuki, Kurobe city, Toyama pref.; Itoshiro, Gujo city, Gifu pref.; Fujikura valley, Kamiono, Ono city, Fukui pref.; Nishiamada, Fukui city, Fukui pref.
• Fossils (Limestone): Brachiopods (Plicatiferina borealica), Bryozoans
• Fossils (Limestone, Foraminifera): Bradyina sp., Climacammina cf. antiqua, Tetrataxis sp.

• Takeuchi et al. (2017) Geology of the Tomari District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 121p. (in Japanese with English abstract 4p.)
• Tazawa (2010) Jour. Geol. Soc. Japan, vol.116, no.1, pp.51-54 DOI
• Kunugiza et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.83-101 DOI
• Umeda et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.11, pp.587-590 DOI
• Harayama et al. (1991) Geology of the Yarigatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 190p. (in Japanese with English abstract 8p.)