Yadoriki
Yadoriki, Matsuda city, Ashigara-Kami county, Kanagawa pref., Japan
Occurrence
Prehnite-Pumpellyite facies metamorphic rocks
Basaltic to dacitic tuff of the early Miocene (17 Ma) Togatake Subgroup, the bottom member of Tanzawa Group, subjected to Prehnite-Pumpellyite facies metamorphism by the Tanzawa tonalite in the late Miocene (7 Ma). The Tanzawa Group is considered as the accreted Izu island arc. The Tanzawa tonalite is I-type (Magnetite-series). Approximately 6 km apart from tonalite, the heat source. Ages of sedimentary rocks were determined by microfossils, tonalite by radiometric dating.
Outcrop of dacitic tuff of the Togatake Subgroup subjected to Prehnite-Pumpellyite facies metamorphism. The grayish-green outcrop is composed of metamorphosed tuff. The grayish-green color is due to pumpellyite. Albite and quartz spots are also observed.
Reported Minerals
- Scolecite
- Pumpellyite
Mineral Assemblages
- Scolecite - Albite - Epidote
- Pumpellyite - Albite
Localities
- Onna-Saka (Basalt)
- Hirayama (Basalt)
- Kouragahana (Pillow lava)
- Nakayashiki (Hyaloclastite)
- Iwakake (Hyaloclastite)
- Yadoriki (Tuff)
- Heguri (Sandstone, Gabbro)
- Mount Chiba (Datolite)
- Kami-Ochiai (Axinite-Datolite)
- Nyushima (Axinite-Datolite)
- Nanasawa (Celadonite)
- Oisawa (Celadonite)
- Mount Gozen (Celadonite)
Related Occurrences
- Albite-Epidote-hornfels facies
- Hornblende-hornfels facies
- Pyroxene-hornfels facies
- Sanidinite-hornfels facies