Tatamiishi Lava

[ Top ] [ Japanese ]

Tatamiishi Lava Takahashi and Nishiki, 2006

Volcanic rocks
early Pleistocene (1.14 Ma, K-Ar)

Lithofacies: Olivine-bearing hypersthene augite andesite, Dacite
Lithofacies: Lava (a flow unit)

Eruptive volume: 1.4 km³
Thickness (A unit): 0 - 100 m or thicker
Upper limit: Conformity (Asadagiri Sands and Mud), Unconformity (Amazakai Pyroclastic Flow Deposit)

Kasuga Volcanic Rocks
[ Upper ]
--------------
Okawaratoge Pyroclastics
--------------
Karasawa Lavas
--------------
Nagato Lavas
--------------
Manitazawa Lava
--------------
Mochizuki Volcaniclastics
--------------
Tatamiishi Lava
--------------
[ Lower ]

Tokin-no-iwa volcanic body
[ Upper ]
--------------
Kasuga Volcanic Rocks
--------------
[ Lower ]

Yabashira volcanoes
[ Upper ]
--------------
Kengamine volcanic body
--------------
Byobuiwa volcanic body
--------------
Yabashirayama volcanic body
--------------
Ryugamine volcanic body
--------------
Tokin-no-iwa volcanic body
--------------
[ Lower ]

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

Distribution: Tatamiishi, Saku city, Nagano pref.; 800 - 1,100 m above sea level, Hacchoji river, Oyachi - Asadagiri, Saku city, Nagano pref.; Ashida river, Nakao, Tateshina city, Kitasaku county, Nagano pref.

Nishiki and Takahashi (2012) Jour. Geol. Soc. Japan, vol.118, no.8, pp.499-515 DOI
Kawachi and Aramaki (1979) Geology of the Komoro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 2p.)