[ Top ] [ Japanese ]
Tamagawa Welded Tuff
Invalid name. Re-defined to lower Kurasawayama Welded Tuff and upper Bunamoribokujo Welded Tuff. (Sudo, 2012)
Invalid synonym: Tamagawa Dacites, Shibukuro Welded Tuff, Kashinai Formation, a part of Shinmachi Dacite, Shibutami Welded Tuff, Nishine Welded Tuff, Hashiba Formation
- Volcanic rocks
- Upper: Pleistocene (1.5 - 0.7 Ma, K-Ar)
- Upper: Pleistocene (2.5 - 1.2 Ma, K-Ar)
- Pleistocene (2.5 - 0.7 Ma, K-Ar)
- Correlation: Shibutami Tephra, Tmg-R4 Tephra
- Lithofacies (Upper): Dacitic welded tuff
- Lithofacies (Lower): Rhyolitic welded tuff
- Source: confluence of Tamagawa river and Shibukuro creek, Senboku city, Akita pref.
- Upper limit: Unconformity (Takinosawa 6 Lava, Oshiromori Lava, Yasemori Lava, Kensomori Lava, Obukadake Lava, Kamotayamagairinzan Lava, Lower Onagane Lava, Komonomori Agglomerate, Sumikawa Lava, Matsukawa Andesite, 1162.3m-yama Lava, Ainaizawa Formation)
- Lower limit: Unconformity (Old-Tamagawa Welded Tuff, Yamatsuda Formation, Masuzawa Formation, Koshitomaezawa Formation, Kitamatagawa Formation)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Morioka city, Iwate pref.; Appi creek, Ninohe city, Iwate pref.; Origashima creek, Kazuno city, Akita pref.; Kitamata creek, Akita city, Akita pref.
- Nakaya et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.7, pp.457-473 DOI
- Suto and Ishii (1987) Geology of the Shizukuishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 142p. (in Japanese with English abstract 5p.)
- Kawano and Uemura (1964) Hachimantai, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 36p. (in Japanese with English abstract 8p.)
- Ozawa and Sumi (1958) Tazawako, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 23p. (in Japanese with English abstract 4p.)
- Ozawa and Sumi (1957) Moriyoshiyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 42p. (in Japanese with English abstract 5p.)