The outcrop is along Akwanga-Keffi
road (Nassarawa State) about 28km away from Akwanga round about. The outcrop composes of bolders
of quartz, micas and it shows evidence of pegmatite. Others are pure granite
gneiss that has be metamorphosed.
A
diorite mineral is found here which is
associated with migmatite and it compose mainly of intermediate minerals
(mafic)
example plagioclase, biotite, horneblend, muscovite and they are dark
coloured with the grain size of medium to fine.
The
structures identified are joints,(Horizontal and vertical joints) quartzio –
feldspathic veins, weak foliation and quartz veins. The measurement take at
this location are;
Thickness
of quartzio-feldspathic vein
(1) 0.5cm
– 1cm
Thickness of quartz vein – 2cm
Trend of vein
N05o – N85o,
N75o – N257o, N28 – N206o
Strike
N05o –
N205o, N103o – N285o
Dip amount 26o
Dip direction 299 NW
Trend of vertical joint
N70
– N250
Horizontal joint N99o –
M280o
The co-ordinates of the location are;
The G. P.S Reading
Latitude: 080 51' 72"N
Longitude:
08o 11'89" E
Elevation: 433m