Katsuma Quartz Diorite

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Katsuma Quartz Diorite Hashimoto, 1957

Invalid synonym: Osafuji Quartz Diorite

Plutonic rocks
Late Cretaceus (121 - 57.8 Ma, Rb-Sr; 125, 100 Ma, �W��R��; 70.6, 62,8 Ma, K-Ar)
Intruded by: Dolerite dikes

Lithofacies: Hornblende biotite quartz diorite, Tonalite

Distribution (Length): 23 km
Distribution (Width): 0.5 - 2 km

Younger Ryoke Granitoids (Takato, Nagano pref.)
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Katsuma Quartz Diorite
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Takato Granite
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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: Nagafuji - Mizukami - Mount Tsukikura, Takato town, Ina city, Nagano pref.; Nakasokura, Komagane 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.)
Kawachi et al. (1983) Geology of the Ichinose District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)