Iodake Welded Tuff

[ Top ] [ Japanese ]

Iodakekabu Welded Tuff

Volcanic rocks
Pleistocene

Lithofacies: Hypersthene augite andesite welded tuff, Welded scoria
Lithofacies (Minor): Scoriaceous agglomerate

Thickness: 3 - 15 m
Lower limit: Unconformity (Iodakejobu Lava, Iodakekabu Lava)

Iodake Volcanic Rocks
[ Upper ]
~~~~~~~~~~~~~~
Iodake Welded Tuff
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Iodakejobu Lava
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Iodakekabu Lava
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[ Lower ]

Younger period (Mount Iodake)
[ Upper ]
~~~~~~~~~~~~~~
Iodake Volcanic Rocks
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[ Lower ]

Yatsugatake volcano
[ Upper ]
+__+__+__+__+_
Younger period
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Older period
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[ Lower ]

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

Distribution: Mount Iodake, Chino city - Minamimaki city, Minamisaku county, Nagano pref.

Kawachi (1977) Geology of the Yatsugatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 92p. (in Japanese with English abstract 4p.)
Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)