Younger Granite Of Nigeria

Careful examination of the younger granite complexes of this province as seen on the 1.

Younger granite of nigeria.

Bibliography on the younger granite ring complexes and tin mineralization in west africa with emphasis of nigeria. The nigeria basement complex have been conformed to comprise of three major rock units of which are. 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.

Sedimentary basins the cretaceous to recent basins in nigeria include. 2 000 000 geological map of nigeria or on pl. Sufficient information is now available to indicate that the province includes some of the finest examples of granitic ring complexes in the world. Large sedimentary basins formed in southern nigeria divided by the okitipupa ridge.

More than 50 complexes occur in nigeria obaje 2009. 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. 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. The younger granite ring complexes of west africa extend from air to cameroun and range in age from palaeozoic to tertiary.

The younger granites are primarily alkali feldspar granites although the ring complexes also include rhyolite gabbro and syenite. Vii of the society s memoir no. 1 and 2 k feldspars from fayalite hedenbergite granite and porphyry. Rare earth patterns of k feldspar separated from granitic rock of younger granites of nigeria.

Journal of african earth sciences 1983 vol. 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. From this description of rocks units and also the younger granite intrusion.

The cycle of igneous activity was initiated by a volcanic phase during which large volumes of rhyolitic lavas were extruded. This memoir presents a summary of recent studies on the nigerian younger granite complexes. They are dominated by granites and are emplaced in pan african basement rocks on swells bordering sedimentary basins. 2 1 form part of a wider province of alkaline anorogenic magmatism.

3 and 4 k feldspars from has tingsite biotite granite and porphyry. The mesozoic younger granite ring complexes of nigeria fig.