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Shinzan Rhyolite (Fujioka, 1959) Kobayashi et al., 2008

Invalid synonyms: Shinzan Rhyolites

• Type locality: Shinzan, Kitaura, Oga city, Akita prefecture
• Volcanic rocks
• Subaqueous domes, Shallow sheets of intrusive rocks
• Eocene - Oligocene (36.7 - 23.7 Ma, Ar-Ar, K-Ar, FT)

• Sedimentary facies: Marine
• Sedimentary facies (Bottom): Turbidite originated from pyroclastic eruption
• Sedimentary facies (Minor): Vent-fill deposit
• Depth of water: 200 m or deeper
• Lithofacies: Biotite rhyolite Lava (Hyaloclastite)
• Lithofacies (Bottom): Tuffaceous conglomerate Sandstone, Biotite rhyolite lapilli tuff
• Lithofacies (Minor): Rhyolite volcanic breccia, Tuff breccia

• Source: around Mount Shinzan
• Thickness: 200 m or thicker
• Upper limit: Abut unconformity (Nomuragawa Formation), , Unconformity (Nomuragawa Tuffaceous Conglomerate, Nomuragawa Basalt)
• Lower limit: Unconformity (Butaijima Basalt, Nagasaki Dacite?)

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

• Distribution: Honzan - Shinzan - Mount Kenashi, Kitaura, Oga city, Akita pref.; Kamogawa river, Oga city, Akita pref.; Nagasaki - Kanagasaki - Toga, Oga city, Akita pref.; Nomura river, Oga city, Akita pref.; Cape Benten, Oga city, Akita pref.

• Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
• Kano et al. (2011) Geology of the Toga and Funakawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)
• Kobayashi et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.10, pp.552-562 DOI
• Sato et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.1, pp.31-46 DOI
• Ohguchi et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.17-32 DOI
• Fujimoto et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.51-74 DOI