Omigawa Unit

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Omigawa Unit

High P/T metamorphic rocks
Metamorphism: early Carboniferous - early Permian (380 - 262 Ma, K-Ar)

Metamorphic facies: Greenschist, Epidote-Amphibolite
Metamorphic facies: Chlorite zone, Garnet zone, Biotite zone
Lithofacies: Mafic schist
Lithofacies (Minor): Pelitic schist

Renge Metamorphic Rocks (Omi, Niigata pref.)
[ Upper ]
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Omigawa Unit
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Yunotani Eclogite Unit
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[ Lower ]

Renge Belt (Hida Marginal Belt)
/--/--/--/--/-
Oeyama Ophiolite
/--/--/--/--/-
Renge Metamorphic Rocks
/--/--/--/--/-

Renge Belt (Chugoku mountains)
/--/--/--/--/-
Oeyama Ophiolite
/--/--/--/--/-
Renge Metamorphic Rocks
/--/--/--/--/-

Sangun Metamorphic Belt
[ Young ]
/--/--/--/--/-
Renge Belt
/--/--/--/--/-
Suo Belt
/--/--/--/--/-
[ Old ]

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

Distribution: Kanayamadani valley - Yunotani valley, Itoigawa city, Niigata pref.

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.)