Sennintai Lava and Pyroclastic Rocks

Sennintai Lava and Pyroclastic Rocks Kudo et al., 2004

Type locality: 1,180 m above sea level between Sukayu hot spring - Mount Otake, Aomori city, Aomori prefecture
Post-caldera volcanoes
Volcanic rocks
Pleistocene (ca. 0.35 - 0.15 Ma?)

Lithofacies: Quartz-bearing olivine augite hypersthene andesite
Lithofacies (Lava): Aa lava (10 and several sheets or more)
Lithofacies (Pyroclastic rocks): Tuff breccia

Thickness: 500 m or thicker?
Thickness (A sheet): 2 - 5 m
Upper limit: Unconformity (Iodake Lava, Odake 3rd-stage Lava, Kodake 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: Sukayu hot spring - Mount Otake, Aomori city, Aomori pref.; Mount Nanashi, 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.)