Rare-element Pegmatite (Beryl)
Chemical Process (Liquid-phase Growth) - Closed system under ground (Melt precipitation)
Abbreviation
REL-Li
Classification
Beryl-Columbite subtype < Beryl type < Lithium subclass < (LCT family) < Rare-element class < Granitic pegmatite
Required Geological Setting
Occurrence
Pegmatites formed by fractional crystallization of S-type granite magma associated with upper Greenschist facies to Amphibolite facies in Barrovian-type middle-P metamorphism. Pegmatites are emplaced at shallow depth. Most of pegmatites are reported from active continental margin granites in compressional crustal settings such as the Pacific Ocean. Textures of host rocks are clearly cut by pegmatites, and host rocks are subjected to contact metamorphism by granites or pegmatites. Pegmatites are massive and pockets are very rare. The beryl-columbite subtype is characterized by abundant Be, Nb, and Ta.
Distribution of the beryl-columbite subtype rare-element pegmatites described in this site. Red is ilmenite-series granites corresponding to S-type granites, and blue is magnetite-series granites corresponding to I-type granites.
Mineral Assemblages (Major minerals)
Quartz, Orthoclase, Microcline, Albite, Muscovite, Almandine
Mineral Assemblages
Beryl, Columbite-(Fe), Tantalite-(Fe), (Rutile)
Localities
- Yamano-o (Garnet)
Related Occurrences
- Pegmatite (Abyssal)
- Pegmatite (Muscovite)
- Pegmatite (Muscovite-Rare element)
- Pegmatite (Rare element, Allanite)
- Pegmatite (Rare element, Euxenite)
- Pegmatite (Rare element, Gadolinite)
- Pegmatite (Rare element, Titanium)
- Pegmatite (Rare element, Beryl)
- Pegmatite (Rare element, Phosphate)
- Pegmatite (Rare element, Spodumene)
- Pegmatite (Rare element, Petalite)
- Pegmatite (Rare element, Lepidolite)
- Pegmatite (Rare element, Elbaite)
- Pegmatite (Rare element, Amblygonite)
- Pegmatite (Rare element, Albite-Spodumene)
- Pegmatite (Rare element, Albite)
- Pegmatite (Miarolitic, REE)
- Pegmatite (Miarolitic, Li)
- Pegmatite (Gabbro)