Akimotoko Pyroclastic Flow Deposit

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Akimotoko Pyroclastic Flow Deposit

Type locality: Fukushima prefecture
Tephra
Kijigoya caldera fill sediments
late Miocene (10.0, 9.8 Ma, FT)
Interfingered (Kijigoya Formation)

Sedimentary facies: Pyroclastic flow deposit
Lithofacies: Orthopyroxene clinopyroxene dacite
Lithofacies: Pumice lapilli tuff, Tuff breccia

Lower limit: Unconformity (Tsuchiyutoge Formation)

Kijigoya Formation
[ Upper ]
~~~~~~~~~~~~~~
Post-caldera stage intrusive rocks
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Akimotoko Pyroclastic Flow Deposit / Debris avalanche deposit
~~~~~~~~~~~~~~
[ Lower ]

Kijigoya caldera
[ Upper ]
~~~~~~~~~~~~~~
Kijigoya Formation
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[ Lower ]

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

Distribution: Aizu region, 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.)