Younger Granite Of Nigeria

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.

Younger granite of nigeria.

Vii of the society s memoir no. Journal of african earth sciences 1983 vol. This memoir presents a summary of recent studies on the nigerian younger granite complexes. Rare earth patterns of k feldspar separated from granitic rock of younger granites of nigeria.

They occur in a zone 200 km wide and 1 600 km long extending from northern niger to south central nigeria. Careful examination of the younger granite complexes of this province as seen on the 1. Other occur rences approximate a north south belt towards the middle benue in the south where the ages are younger and towards niger republic in the north. 1 shows also that these four planes of weakness appear to have exercised a significant control in the emplacement of the younger granites.

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. Bibliography on the younger granite ring complexes and tin mineralization in west africa with emphasis of nigeria. 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. They are dominated by granites and are emplaced in pan african basement rocks on swells bordering sedimentary basins.

Journal of african earth sciences 1983 vol. 3 and 4 k feldspars from has tingsite biotite granite and porphyry. Sedimentary basins the cretaceous to recent basins in nigeria include. 1 and 2 k feldspars from fayalite hedenbergite granite and porphyry.

From this description of rocks units and also the younger granite intrusion. The ring dikes tend to be highly mineralized and enriched in niobium and tin. 5 and 6 k feldspars from barren biotite granite 7 8 and 9 k feldspars from stanniferrous biotite granite. 2 1 form part of a wider province of alkaline anorogenic magmatism.

The cycle of igneous activity was initiated by a volcanic phase during which large volumes of rhyolitic lavas were extruded. The younger granites are primarily alkali feldspar granites although the ring complexes also include rhyolite gabbro and syenite. 2 000 000 geological map of nigeria or on pl. The mesozoic younger granite ring complexes of nigeria fig.

Sufficient information is now available to indicate that the province includes some of the finest examples of granitic ring complexes in the world. More than 50 complexes occur in nigeria obaje 2009.