Idodake Pyroclastic Rocks

Synonym: Idodakesancho Explosion Breccia, Hinangoya Scoria Fall Deposit

Type locality: Crater margin of Mount Ido, Aomori city, Aomori prefecture
Post-caldera volcanoes
Volcanic rocks
Pleistocene

Lithofacies: Olivine-bearing quartz augite hypersthene andesite
Lithofacies: Breccia, Tuff breccia

Mode of eruption: Phreatic
Thickness: 10 m or less
Thickness (A unit): 20 - 50 cm
Lower limit: Conformity? (Idodake Lava)

Kita-Hakkoda volcanoes
[ Upper ]
~~~~~~~~~~~~~~
Odake Lava / Odake Pyroclastic Rocks
~~~~~~~~~~~~~~
Idodake Lava / Idodake Pyroclastic Rocks
'''''''/,,,,,,
Akakuradake Lava / Akakuradake Pyroclastic Rocks
~~~~~~~~~~~~~~
Kodake Lava
~~~~~~~~~~~~~~
Iodake Lava
~~~~~~~~~~~~~~
Sennintai Lava and Pyroclastic Rocks
~~~~~~~~~~~~~~
Tamoyachidake Lava
~~~~~~~~~~~~~~
Takadaotake Lava and Pyroclastic Rocks
~~~~~~~~~~~~~~
Hinadake Lava and Pyroclastic Rocks
~~~~~~~~~~~~~~
Tashirotai Lacustrine Formation
~~~~~~~~~~~~~~
[ Lower ]

Hakkoda caldera
[ Upper ]
~~~~~~~~~~~~~~
Kita-Hakkoda volcanoes
~~~~~~~~~~~~~~
Minami-Hakkoda volcanoes
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Mount Ido, Aomori city, Aomori pref.

Takarada and Muraoka (2004) Geology of the Hakkoda San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 86p. (in Japanese with English abstract 4p.)