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Nakaazumayama volcano

• Volcanic rocks
• Volcanic cone
• middle Pleistocene (0.35 - 0.25 Ma, K-Ar)

• Lithofacies: Orthopyroxene clinopyroxene andesite
• Lithofacies (Minor): Quartz-bearing orthopyroxene clinopyroxene andesite
• Lithofacies: Lava (3 flow units)

• Source (3 craters): Mount Nakaazuma, Tsugumori
• Thickness (A unit): 20 - 40 m
• Upper limit: Unconformity (Higashiazumayama volcano)
• Lower limit: Unconformity (Nakadaiten-Higashidaiten volcano)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Nakatsugawa river - Okuragawa river - Lake Akimoto, Inawashiro city, Yama county, Fukushima pref.

• Furukawa et al. (2018) Geology of the Azuma Yama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 74p. (in Japanese with English abstract 3p.)
• Hasegawa et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.33-48 DOI