Nyukasa Unit

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Nyukasa Unit

Invalid synonym: Nyukasayama Group

Accretionary complex
Deposition: Middle - Late Jurassic

Sedimentary facies: Marine
Metamorphic facies: Pumpellyite-Actinolite
Lithofacies: Mudstone, Mudstone mélange
Exotic blocks (Crusts): Meta-basaltic rocks (Basalt lava, Pillow lava, Dolerite, Volcaniclastic rocks), Chert, Limestone
Lithofacies (Minor): Gabbro, Ultramafic rocks

Thickness: ca. 500 - 2,000 m or thicker
Distribution (Width): ca. 1.5 - 4 km

Southern Chichibu Belt (Takato, Nagano pref.)
[ Upper ]
/--/--/--/--/-
Kamanashi Unit
/--/--/--/--/-
Hodokubo Unit
/--/--/--/--/-
Higashitani Unit
/--/--/--/--/-
Nyukasa Unit
/--/--/--/--/-
[ Lower ]

Chichibu Belt
[ Upper ]
/--/--/--/--/-
Kurosegawa Belt
/--/--/--/--/-
Northern Chichibu Belt
/--/--/--/--/-
Southern Chichibu Belt
/--/--/--/--/-
[ Lower ]

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

Distribution: Mount Nyukasayama, Ina city - Fujimi city, Suwa county, Nagano pref.; Oguro river, Ina city, Nagano pref.

Makimoto et al. (1996) Geology of the Takato District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 6p.)