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Microgranite dykes
Here there are a number of dykes
(.<1m). They are planar and well differentiated from the surrounding
rock (with a sharp contact).The dyke material is a light coloured
fine grained igneous rock and is therefore different from those
at locations 1 and 2. which are coarse
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| This
dyke extends all the way from the road up the top of the side of
the gorge |
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| .Rounding
the corner towards the location of the dykes. The first of them
is to the left of the person in the bright yellow top |
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The Composition of the rock in
the dykes
Aplite (a textural term) is usually
said to have the texture of granular sugar. The rock of these dykes
is a little coarser than this but is probably still within range
and the small grain size is associated with rapid cooling. As is
usual for aplite the texture is equigranular with fairly well formed
crystals. Aplite is said to usually occur only in veins up to 20
cm and these are up to 1m. The composition of the material in these
dykes is very low in dark coloured minerals and there is almost
no biotite, (see Location 1) |
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