K-Feldspathization
Chemical Process (Alteration) - Open system under ground (Alkaline metasomatism)
Synonym
Potash feldspathizaiton
Index Minerals
K-feldspar
Required Geological Setting
Occurrence
Metasomatic zone formed by alkaline hydrothermal fluid produced at the late stage of differentiation of I-type Granitic magma.
Change of mineral assemblages
- [ Extinct ] Quartz, Biotite, Hornblende
- [ Appear ] Orthoclase, Microcline
Mineral Assemblages
- [ Felsic Rocks ] Orthoclase, Microcline, Albite
Localities
- Yabuhara mine (K-feldspar)
- Mizanori mine (K-feldspar)
Related Occurrences
- Laumontite-Albite zone (Zeolite z., Propylite z.)
- Wairakite-Albite zone (Zeolite zone)