Yonegamori Dacite

[ Top ] [ Japanese ]

Yonegamori Dacite (Usuda et al., 1979) Tsuchiya and Yoshikawa, 1994

Invalid synonym: Yonegamori Dacite Member

Type locality: Yonegamori, Kyowa, Daisen city, Akita prefecture
Volcanic rocks
Lava dome
late Miocene (8.7 - 7.0 Ma)

Sedimentary facies: Lava dome, Intrusive rocks
Lithofacies: Pyroxene dacite, Hornblende dacite, Pyroxene andesite lava
Lithofacies (Marginal): Pyroclastic rocks, Hyaloclastite

Distribution (Diameter): 1 - 2 km
Upper limit: Unconformity (Tentokuji Formation)

Funakawa Formation (Kariwano , Akita pref.)
[ Upper ]
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Osanai Tuff Member / Yonegamori Dacite
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[ Lower ]

Oga peninsula, Akita pref.
[ Upper ]
~~~~~~~~~~~~~~
Shibikawa Formation
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Wakimoto Formation
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Kitaura Formation
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Nishimizuguchi Formation
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Minamihirasawa Formation
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Funakawa Formation
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[ Lower ]

Oga peninsula - Dewa hills, Akita pref.
[ Upper ]
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Sasaoka Formation
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Tentokuji Formation
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Funakawa Formation
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[ Lower ]

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

Distribution: Yonegamori - Chojamori - Hatayama, Kyowa, Daisen city, Akita pref.

Tsuchiya and Yoshikawa (1994) Geology of the Kariwano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 72p. (in Japanese with English abstract 4p.)