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

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Author(s): E.S.Nyarko | D. K. Aseidu | S.Osea, et al.

Journal: Proceedings of the International Academy of Ecology and Environmental Sciences
ISSN 2220-8860

Volume: 2;
Issue: 3;
Start page: 177;
Date: 2012;
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Keywords: granitoid | rock | soil geochemical | characteristic | Ghana

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.
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