Mikasayama volcano

[ Top ] [ Japanese ]

Mikasayama volcano

Invalid name: Mikasayama Lava

Type locality: Mount Mikasayama, Otaki city, Kiso county, Nagano prefecture
Volcanic rocks
Composite stratovolcano
middle Pleistocene (0.44 - 0.42 Ma)

Lithofacies: Olivine-bearing hornblende augite hypersthene andesite lava

Source: west-northwest of Mount Mikasayama
Thickness: 10 - 150 m
Lower limit: Unconformity (Tobu volcano group, Tsuchiurazawa volcano)

Older Ontake Volcanic Rocks
[ Upper ]
~~~~~~~~~~~~~~
Mikasayama volcano
~~~~~~~~~~~~~~
Kamidawarayama volcano
~~~~~~~~~~~~~~
Tsuchiurazawa volcano
~~~~~~~~~~~~~~
Tobu volcano group
~~~~~~~~~~~~~~
[ Lower ]

Ontake volcano
[ Upper ]
~~~~~~~~~~~~~~
Younger Ontake Volcanic Rocks
~~~~~~~~~~~~~~
Older Ontake Volcanic Rocks
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Mount Mikasayama - Mount Komikasayama - Mizoguchigawa river - Suzugasawa river, Otaki city, Kiso county, Nagano pref.

Takeuchi et al. (1998) Geology of the Kiso-Fukushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 4p.)
Yamada and Kobayashi (1988) Geology of the Ontakesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 9p.)