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Takidani Granodiorite Harayama, 1975

Formed in 1.4 Ma, and one of the world youngest granitoids cropped out at the surface.

• Type locality: Takidani valley - Hidarimatadani valley, Okuhidaonsengo, Takayama city, Gifu prefecture
• Plutonic rocks
• early Pleistocene (1.36 Ma, U-Pb; 1.9 - 0.8 Ma, K-Ar, Rb-Sr, FT)
• Intruded by: Suiendani Source Vent
• Intruded in: Okumarusawa Granite, Yarisawa Breccia, Togesawa Welded Tuff, Sorayama Formation, Mino Belt

• Lithofacies (Upper): Biotite granite
• Lithofacies: Hornblende biotite granodiorite

• Distribution (East - West): ca. 4 km
• Distribution (South - North): ca. 13 km
• Upper limit: Unconformity (Warudaniyama Lava, Nakao Pyroclastic Flow Deposit)

• Distribution: Takidani valley, Hidarimatadani valley - Suiendani valley - Shiradashizawa creek - Nishihosanso mountain villa, Okuhidaonsengo, Takayama city, Gifu pref.; Lake Taishoike, Azumi, Matsumoto city, Nagano pref.

• Harayama (2015) Jour. Geol. Soc. Japan, vol.121, no.10, pp.373-389, DOI
• Ito et al. (2012) Jour. Geol. Soc. Japan, vol.118, no.7, pp.449-456 DOI
• Harayama et al. (1991) Geology of the Yarigatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 190p. (in Japanese with English abstract 8p.)
• Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)