[ Top ] [ Japanese ]

Ichinomegata maar

• Type locality: Togashiohama, Oga city, Akita prefecture
• Maar volcano
• Volcanic rocks
• Pleistocene (80 - 60 ka)

• Sedimentary facies: Phreatomagmatic eruption
• Sedimentary facies: Pyroclastic surge deposit, Pyroclastic fall deposit
• Lithofacies: Calc-alkaline andesite scoria volcanic lapilli, Volcanic ash, Pumiceous volcanic lapilli
• Lithofacies (Xenolith): Lherzolite, Websterite, Orthopyroxenite, Gabbro, Amphibolite, Granite, Metamorphic rocks, Sedimentary rocks
• Lithofacies (Xenolith, Minor): Harzburgite
• Sedimentary structures: Low angle cross stratification

• Distribution (Diameter): ca. 0.8 km at the maximum
• Thickness: 8 m or thicker
• Lower limit: Unconformity (Shimoshinzan Terrace Deposit)

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

• Distribution: Togashiohama, Oga city, Akita pref.

• 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.)
• Satsukawa and Michibayashi (2009) Jour. Geol. Soc. Japan, vol.115, no.6, pp.288-291 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