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Proceedings of the International Academy of Ecology and Environmental Sciences, 2012, 2(3): 177-192
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Article

Geochemical characteristics of the basin-type granitoids in the Winneba Area of Ghana

E.S.Nyarko 1, D. K. Aseidu2, S.Osea3, S.Dampare3, N.Zakaria1, J.Hanson1, J.Osei1, S.Enti-Brown1, D.Tulasi1
1Nuclear Chemistry and Environmental Research Centre, National Nuclear Research Institute, Ghana Atomic Energy Commission, P. O. Box LG80, Legon, Accra, Ghana
2Department of Earth Science, University of Ghana, Legon, P.O.Box LG80, Legon, Accra, Ghana
3Department of Nuclear Sciences and Applications, Graduate School of Nuclear and Allied Sciences. P.O. Box AEI, Atomic Campus, Accra, Ghana

Received 15 December 2011;Accepted 22 January 2012;Published online 1 September 2012
IAEES

Abstract
Representative rocks of the metasediment suite granitoids (basin-type granitoids) were selected from the Winneba area in the Central part of Ghana for geochemical analyses. The rocks contained plagioclase, Kfeldspar, amphibole, Biotite and titanite as the main mineral phase. The CIPW normative mineral shows that the rocks are granodiorite, monzogranite, and quartz -monzonite. The geochemical classification of the basintype granitoids based upon the Fe-Number, the modified alkali-lime index and the aluminium saturation index, defined the rocks as ferroan, alkali-calcic to calc-alkali and peraluminous respectively. The rocks also showed a calc-alkaline affinity. The aluminous character by the molar ratio Al/ (Na+ K+ Ca/2) show I-type characteristics of the rocks which is a characteristic of basin type granitoids in Ghana. The major element composition of the whole rock and Biotite mineral revealed that the basin- type granitoids are from metagreywackes, and or metabasaltic to metatonalitic and calc-alkaline to peraluminous source.

Keywords granitoid;rock;soil geochemical;characteristic;Ghana.


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