Iimoriyama Lava

[ Top ] [ Japanese ]

Iimoriyama Lava (Saito, 1955)

Invalid synonym: Iimoriyama parasitic cone

Type locality: western flank of Mount Iimoriyama, Yamanouchi city, Shimoakai county, Nagano prefecture
Volcanic rocks
Lava dome, source of Kosha Pumice Flow Deposit
Pleistocene (0.25 Ma, K-Ar)

Lithofacies: Orthopyroxene clinopyroxene hornblende andesite lava

Distribution (Major axis): 1,000 m
Distribution (Minor axis): 700 m
Thickness: 260 m or thicker

Kosha volcano
[ Upper ]
+__+__+__+__+_
Iimoriyama Lava
~~~~~~~~~~~~~~
Kosha Pumice Flow Deposit
~~~~~~~~~~~~~~
Mitsugoyama Lava
~~~~~~~~~~~~~~
Kosha Lithic Pyroclastic Flow Deposit
~~~~~~~~~~~~~~
Koshashukazantai Lava
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Mount Iimoriyama, Yamanouchi city, Shimoakai county, Nagano pref.

Akahane et al. (1992) Geology of the Nakano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 106p. (in Japanese with English abstract 4p.)