Yaga
Yaga, Yamakita city, Ashigara-Kami county, Kanagawa pref., Japan
Occurrence
Phenocrysts in an andesite dike intruded in the early to Middle Pleistocene (2-0.7 Ma) Ashigara Group. The Ashigara Group is composed of sediments, andesitic lava, and andesitic pyroclasts. The Ashigara Group is considered as trough-fill sediments. Famous locality for augite since 1900's. Ages of sedimentary rocks were determined by microfossiles.
Reported Minerals
- Augite
- Bytownite
Mineral Assemblages
- Andesite (Host) - Augite
- Andesite (Host) - Bytownite
Localities
- Mount Hijiri (Lava, Augite)
- Ikenofukuro (Lava, Hornblende)
- Lake Kuttara (Lava, Basaltic)
- Usami (Lava, Xenolith)
- Sukumo river (Dike, Basaltic)
- Tonosawa (Dike, Basaltic)
- Yaga (Dike, Augite)