Rare-element Pegmatite (Titanium)
Chemical Process (Liquid-phase Growth) - Closed system under ground (Melt precipitation)
Abbreviation
REL-REE
Classification
Titanium type < REE subclass < (NYF family) < Rare-element class < Granitic pegmatite
Required Geological Setting
Occurrence
Pegmatites formed by fractional crystallization of I-type granite magma. Pegmatites are associated with Granodiorite emplaced at shallow depth. Most of pegmatites are reported from passive continental margin granites in extentional crustal settings such as the Atlantic Ocean. Textures of host rocks are clearly cut by pegmatites, and host rocks are subjected to contact metamorphism by granites or pegmatites. Pegmatites may have pockets. Pegmatites are composed of quartz, feldspar, mica, and very minor titanium oxide minerals. The Titanium type is not an accepted category but these pegmatites do not fit to any other categories.
Distribution of the titanium-type 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, Microcline, Adularia, Muscovite
Mineral Assemblages
Rutile, Brookite, Anatase
Localities
- Otome Mine (W deposit)
- Hirasawa Mine (Adularia)
- Mount Kinsho (Granodiolite)
- Senno creek (Granodiolite)
- Sakeishi (Granodiolite)
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)