Nashiki Debris Avalanche Deposit

Nashiki Debris Avalanche Deposit (Moriya, 1968) Takemoto, 1998

Invalid synonym: Nashiki Mudflow Deposit

Type locality: Shukumeguri - Nashiki hot spring, Kurohone town, Kiryu city, Gunma prefecture
Volcanic rocks
Mudflow hills
Pleistocene (0.24 - 0.2 Ma)

Lithofacies: Basalt, Basaltic andesite, Andesite
Lithofacies: Volcanic breccia, Tuff breccia

Thickness: 250 m
Distribution: ca. 400 km²
Volume: ca. 8 km³
Upper limit: Unconformity (Volcanic Fan 1 Deposit)
Lower limit: Abut unconformity (Mamioka Tuff)

Akagi Volcano
[ Upper ]
+__+__+__+__+_
Younger Stratovolcano
~~~~~~~~~~~~~~
Nashiki Debris Avalanche Deposit
~~~~~~~~~~~~~~
Older Stratovolcano
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Shukumeguri - Nashiki hot spring, Kurohone town, Kiryu city, Gunma pref.; Niisato, Kiryu city, Gunma pref.; Lake Asami, Kasakake town, Midori city, Gunma pref.; Isesaki city, Gunma pref.; Mount Tachibana - Mount Shiroyama, Shibukawa city, 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.)