Shigaraki Granite

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Shigaraki Granite Collaborative Research Group for the Granites around Lake Biwa, 1982

Plutonic rocks
Late Cretaceus (72.6 - 68.4 Ma, K-Ar)
Contemporaneous heterotopic facies: Yagyu Granite, Kabuto Granodiorite
Intruded by: Tanakami Granite

Lithofacies: Biotite granite, Hornblende-bearing biotite granite, Hornblende-bearing biotite granodiorite
Lithofacies (Minor): Quartz diorite, Tonalite

Distribution (East - West): ca. 10 km
Distribution (South - North): ca. 10 km
Upper limit: Abut unconformity (Nakasato Gravels and Clays Member, Makiyama Member, Maki Member)

Younger Ryoke Granitoids (Koka, Shiga pref.)
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Shigraki 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: Shigaraki town, Koka city, Shiga pref.; Ayama, Iga city, Mie pref.

Wakita et al. (2013) Geology of the Kyoto-Tonambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 124p. (in Japanese with English abstract 3p.)
Nakano et al. (2003) Geology of the Minakuchi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 83p. (in Japanese with English abstract 3p.)