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Biwako Ring Complex

• Plutonic rocks
• Ring complex of caldera associated with the eruption of Koto Rhyolites
• Late Cretaceous (ca. 73 - 70 Ma, K-Ar)
• Intruded in: Tamba Belt, Younger Ryoke Granitoids

• Lithofacies: Ilmenite series

• Distribution (Long diameter): 60 km
• Distribution (Short diameter): 40 km

------ Transitional, ~~~~~~ Intrusive, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Shiga pref.

• Kiji et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.107-118 DOI
• Collaborative Research Group for the Granites around Lake Biwa (2008) Jour. Geol. Soc. Japan, vol.114, no.2, pp.53-69 DOI
• Kimura et al. (2001) Geology of the Kitakomatsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 102p. (in Japanese with English abstract 5p.)
• Harayama et al. (1989) Geology of the Gozaishoyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 145p. (in Japanese with English abstract 6p.)