The fenised sandstones and syenite-fenite form aureoles around carbonatites.
2.
The Manitou Islands contain the uncommon rock types of fenite and syenite.
3.
The fenite zone is up to 1 km wide with a breccia zone adjacent to the carbonatite.
4.
It is a carbonatite-fenite complex of oval outline with a longer axis orientated approximately north-south.
5.
Advanced carbonation of felsic and mafic rocks, very rarely, creates fenite, a metasomatic alteration caused particularly by carbonatite intrusions.
6.
This alteration assemblage produces a unique rock mineralogy termed a " fenite " after its type locality, the Fen Complex in Norway.
7.
Under the name the fenites, several types of rocks are separated : fenised sandstones, syenite-fenite, syenite-fenite with nepheline, and feldspar breccias.
8.
Under the name the fenites, several types of rocks are separated : fenised sandstones, syenite-fenite, syenite-fenite with nepheline, and feldspar breccias.
9.
Fenite alteration is known, but very restricted in distribution, around high-temperature metamorphic talc-carbonates, generally in the form of a sort of aureole around ultramafics.
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