Ishibaiyama
Motodo, Kasama city, Ibaraki pref., Japan
Occurrence
Dolomite skarn deposit in Wagakunisan Metamorphic Rocks formed by contact metamorphism of the intrusion of Inada Granite into Kasama Unit, a member of Jurassic accretionary complex of Ashio Belt. Approximately 1 km apart from Inada Granite, the heat source.
Outcrop of dolomite skarn in Wagakunisan Metamorphic Rocks. The gray basement is recrystallized dolomite. White crusts on the surface is sepiolite. The surface of this outcrop is along the sepiolite vein. Sepiolite veins were formed by low temperature hydrothermal activity along fissures at the late stage of skarn formation.
Reported Minerals
- Calcite
- Dolomite
- Wollastonite
- Diopside
- Tremolite
- Forsterite
- Serpentine
- Sepiolite
- Phlogopite
- Spinel
- Clinohumite
- Dravite
Mineral Assemblages
- Calcite - Dolomite - Sepiolite
- Calcite - Wollastonite - Quartz
- Dolomite - Diopside - Tremolite
- Dolomite - Forsterite - Serpentine - Clinohumite
- Hornfels(Host) - Dravite
Localities
- Kasuga Mine (Dolomite skarn)
- Hotokezaki (Dolomite skarn)
- Ishibaiyama (Dolomite skarn)
- Mount Hiiragi (Dolomite skarn)
Related Occurrences
- Skarn (I-type, Magnetite-series)
- Skarn (S-type, Ilmenite-series)
- Skarn (Sanidinite facies)
- Dolomite Skarn