DYKE AND ROCK LACATIONS IN NASSARAWA STATE


This location is also located along Akwanga –Lafia road but it is directly opposite to location I. the outcrop of this location is an outcrop of dyke of younger granite known as quartz feldspar porphry in a ground with age Jurassic, it has ring structure and concentric structures. The outermost parts form the ring dyke, which controls
the intrusion of younger granite complex.

        The basement contacts have been conformed to intrude i.e. between the sedimentary basin and the basement complex which means that more Ferro magnesium minerals are at the centre. The younger granite which is the ring dyke is younger than the basement and it cut across it (Basement complex).

        The grains are arranged at random and they are rich in casscarite or asstalcrite and it contains 10% of ore.
        The main minerals observed there are as follows.
Felsic (quartz, feldspar but quartz is very dominant)
Mafic – biotite is sparsely distributed

        The texture of the rhyolytic dyke is porphritric and it is medium to coarse grain.
        The trends of the vein are;
        N321o - N140o, N21o - N207o
        N02o – 182 SE
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