Journal of african earth sciences 1983 vol.
Younger granite of nigeria.
Sufficient information is now available to indicate that the province includes some of the finest examples of granitic ring complexes in the world.
Sedimentary basins the cretaceous to recent basins in nigeria include.
The younger granite complexes in nigeria are found mainly on the jos plateau forming a distinc tive group of intrusive and volcanic rocks that are bounded by ring dykes or ring faults.
2 000 000 geological map of nigeria or on pl.
They are dominated by granites and are emplaced in pan african basement rocks on swells bordering sedimentary basins.
More than 50 complexes occur in nigeria obaje 2009.
Careful examination of the younger granite complexes of this province as seen on the 1.
Rare earth patterns of k feldspar separated from granitic rock of younger granites of nigeria.
3 and 4 k feldspars from has tingsite biotite granite and porphyry.
They occur in a zone 200 km wide and 1 600 km long extending from northern niger to south central nigeria.
The younger granite ring complexes of west africa extend from air to cameroun and range in age from palaeozoic to tertiary.
The nigeria basement complex have been conformed to comprise of three major rock units of which are.
Journal of african earth sciences 1983 vol.
The ring dikes tend to be highly mineralized and enriched in niobium and tin.
Large sedimentary basins formed in southern nigeria divided by the okitipupa ridge.
2 1 form part of a wider province of alkaline anorogenic magmatism.
1 shows also that these four planes of weakness appear to have exercised a significant control in the emplacement of the younger granites.
1 and 2 k feldspars from fayalite hedenbergite granite and porphyry.
The younger granites the mesozoic younger granite ring complexes of nigeria form part of a wider province of alkaline anorogenic magmatism extending from northern niger republic to south central nigeria.
The younger granites are primarily alkali feldspar granites although the ring complexes also include rhyolite gabbro and syenite.
From this description of rocks units and also the younger granite intrusion.
Migmatite gneiss migmatite gneiss the schist belt and older granite and younger granite complexes and all of these are seen in different location of the studied area.
5 and 6 k feldspars from barren biotite granite 7 8 and 9 k feldspars from stanniferrous biotite granite.
The cycle of igneous activity was initiated by a volcanic phase during which large volumes of rhyolitic lavas were extruded.
The mesozoic younger granite ring complexes of nigeria fig.
This memoir presents a summary of recent studies on the nigerian younger granite complexes.
