Nigaki Group

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Nigaki Group

High P/T metamorphic rocks
Metamorphism: early Carboniferous - Late Jurassic
Intruded by: Myokenzan Granodiorite, Nibori Granite

Lithofacies: Mafic rocks
Lithofacies (Minor): Pelitic rocks
Lithofacies (Protolith): Greenstones
Lithofacies (Protolith, Minor): Slate, Sandstone

Thickness: 1,300 m or thicker
Distribution (East - West): ca. 7 km
Distribution (South - North): ca. 0.5 - 1.5 km

Sangun Metamorphic Rocks (Akaiwa, Okayama pref.)
[ Upper ]
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Nigaki Group
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[ Lower ]

Distribution: Nigaki - Tsuetani - Nakayama, Wake city, Waki county, Okayama pref.; Takata, Yoshinaga city, Wake county, Okayama pref.; Totsuno - Kutsuishi - Nakasejitsu, Akaiwa city, Okayama pref.; Yamatono - Sunami, Mimasaka city, Okayama pref.

Mitsuno and Omori (1965) Susai, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 59p. (in Japanese with English abstract 17p.)