Shobusawa
Hama, Kawazu city, Kamo county, Shizuoka pref., Japan
Occurrence
Low temperature hydrothermal Au-Ag depsit in andesitic to basaltic tuff breccia of the upper part of the early Pliocene (4.0 Ma) Shirahama Group. Andesite and basalt of the upper Shirahama Group are tholeiitic, and have been subjected to propylitization alteration. The Shirahama Group unconformably overlies the Miocene Yugashima Group. Ages of sediments were determined by microfossils and K-Ar radiometric dating.
Reported Minerals
Mineral Assemblages
- Quartz(Gangue) - Gold
- Quartz - Pyrite
Localities
- Shobusawa (Izu Peninsula)
- Seikoshi Mine (Izu Peninsula)
- Toi Mine (Izu Peninsula)
- Tensho Mine (Izu Peninsula)
- Takatama Mine (Gold/Silver deposit)
- Nishizawa Mine (silver sulfides)
- Nebasawa Mine (Gold/Silver deposit)
- Hishikari Mine (Kyusyu Island)