[ Top ] [ Japanese ]

Volcanic Fan 2 Deposit

• Volcanic rocks
• Pleistocene (ca. 50 ka)

• Sedimentary facies: Terrestrial
• Lithofacies: Debris flow deposit, Hyperconcentrated flood flow
• Lithofacies: Andesite, Dacite gravels, Sands
• Sedimentary structures: Parallel stratification, Graded bedding, Reversed graded bedding

• Thickness: ca. 50 m
• Lower limit: Unknown (Ogo Pumice Flow Deposit, Nagumo Pumice Flow Deposit, Volcanic Fan 1 Deposit)

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

• Distribution: Mount Akagi, Gunma pref.

• Ito et al. (2022) Geology of the Kiryu and Ashikaga District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
• Yamamoto (2016) Jour. Geol. Soc. Japan, vol.122, no.3, pp.109-126, DOI