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Rare-element Pegmatite (Titanium)

Chemical Process (Liquid-phase Growth) - Closed system under ground (Melt precipitation)




Titanium type < REE subclass < (NYF family) < Rare-element class < Granitic pegmatite

Required Geological Setting

Plutonic rocks


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.

Rare-element Pegmatite (Titanium)

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

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