Chausu Peak of Mount Nasu
Mount Nasu, Yumoto, Nasu city, Nasu county, Tochigi pref., Japan
Synonym
Mount Chausu-Dake
Occurrence
Sulfate minerals at the fumarole in the crater associated with the early Holocene (10 ka) Chausu-Dake Lava Dome of Nasu Volcano. The Chausu-Dake Lava Dome is composed of andesite, and is associated with approximately 10 craters, the Chausu-Dake Craters. Nasu Volcano has been active since the Middle Pleistoene (0.4 Ma). The age of the lava dome was determined by radiocarbon dating.
Outcrop near a fumarole emitting water vapor in the active crater. The yellowish-brown crusts on the surface are aggregates of fine jarosite crystals. The grayish-white basement is andesite of the Chausu-Dake Lava Dome. It is considered that jarosite was deposited from cooled water vapor of the fumarole.
Reported Minerals
- Siliceous sinter
- Jarosite
- Alunite
- Crandallite?
History
- 1397: Erupted.
- 1408-1410: Erupted.
- 1846: Erupted.
- 1881: Erupted.
- 1953: Erupted.
- 1960: Erupted.
- 1963: Erupted.
Localities
- Manza-Karafuki (Sulphur)
- Iwo Jima (Sulphur)
- Owakutani valley (Sulphur)
- Mount Osore (Sulphur)
- Yugama (Sulphur melt)
- Noboribetsu-Oyunuma Pond (Spherical sulphur, Black)
- Niseko-Oyunuma Pond (Spherical sulphur, Black)
- Mount Iou-dake (Sulphur lava)
- Izu-Oshima Island (Cu minerals)
- Mount Nasu (Sulfate)