The pegmatoid facies shows an equigranular microstructure with subidiomorphic crystals up to 1200 [micro]m (Fig.
The rocks of the chilled margins and the central facies are classified as tephrites, basalts, basaltic andesites and shoshonites whereas the pegmatoid facies includes the most evolved rocks: andesites and dacites (Fig.
The chilled margin and central facies display the lowest REE abundances, whereas the pegmatoid facies presents the highest ones (Table 2).
Sagtjarn Deposit - The mineralisation occurs in biotite-rich acid pegmatoid
veins, sheets and 'knots' cutting across gently northwesterly plunging, open synformal folded meta-argillite gneisses.
Such variations can be explained by the change in the petrophysical properties of rocks when passing from biotite gneiss to pegmatoid
granite at depths below 2.
A pegmatoid area within texturally and compositionally varied gabbro near the northwestern margin of the Duck Lake Pluton was sampled for dating.
5 Cranberry Head locally highly fractured and Syenogranite albitized; leucocratic; granophyric aplite veins common 6 Dude Lake Pluton local pegmatoid lenses.