Kogigawa Granite

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Kogigawa Granite Itihara et al., 1986

Type locality: Kogigawa river, Hata, Kaizuka city, Osaka prefecture
Plutonic rocks
Possibly a volcano-plutonic complex with Sennan Rhyolites
Late Cretaceus (65.7 Ma, FT; 97.8, 72.9 Ma, K-Ar)
Correlation: Takijiri Adamellite
Intruded by: Diorite porphyry
Intruded in: W₂ Unit, W₃ Unit, Biotite granodiorite porphyry

Lithofacies: Biotite granite
Lithofacies (Minor): Hornblende biotite granodiorite

Distribution (South - North): ca. 0.3 - 1 km
Upper limit: Unconformity (Izumi Group, Osawa Conglomerate, Osaka Group)

Younger Ryoke Granitoids (Kishiwada, Osaka pref.)
[ Young ]
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Kogigawa Granite
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[ Old ]

Ryoke Belt
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Ryoke Metamorphic Rocks
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Younger Ryoke Granitoids
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Older Ryoke Granitoids
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------ Transitional, ~~~~~~ Intrusive, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Kogigawa river, Hata, Kaizuka city, Osaka pref.; Bessho, Sennann city, Osaka pref.; Chichioni town, Izumi city, Osaka pref.; Osawa town, Kishiwada city, Osaka pref.; Moyama, Izumisano city, Osaka pref.

Itihara et al. (1986) Geology of the Kishiwada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)