Examples of pegmatite

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A gabbroic pegmatite is developed in the centre of the intrusion along its entire exposed 5 km strike length.
Where the pegmatites and alteration zones are cut, they show brittle offset.
There are, however, no field observations that indicate replacement of pre-existing gabbro cumulates by pegmatite in the macrodyke.
A trend towards more extensive plagioclase zonation is observed above the central gabbroic pegmatite.
They are more iron-rich in the central gabbroic pegmatite where there is a tendency for the grains to be less zoned.
The mineralogy of these pegmatites is similar to that of the central gabbroic pegmatite.
However, they also refer to it as an intrusion 'largely devoid of internal structure' in which 'layering, mineral fabric, xenoliths and pegmatites are uncommon'.
The pegmatites appear undeformed, and no significant differences exist between the two samples.
The sense of deflection (fanning) of foliation at the pegmatite contacts may be predicted in stereographic projection (e).
Conspicuous pink mylonitized pegmatites are intensively brecciated along such crush zones.
We therefore suggest that the analysed part of the gabbroic pegmatite represents a 'cumulate' from which an incompatible trace element-enriched melt has escaped.
The pegmatite could therefore represent interstitial melt mobilized from gabbroic cumulates that later accumulated and crystallized at its present stratigraphic location.
Mobilized interstitial liquids were arrested at a specific level in the intrusion and crystallized to form the central gabbroic pegmatite.
The weak deformation in the pegmatites has no asymmetry and is geometrically unrelated to the mylonites and the gneisses.

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