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Journal of Geosciences and Geomatics. 2022, 10(3), 112-125
DOI: 10.12691/JGG-10-3-1
Original Research

Contribution to the Petrogenesis of Pan-Africain Granitoids from East Pitoa in the Northern Cameroon Domain of the Central Africain Fold Belt: Implications for Their Sources and Geological Setting

Cedric Roth Happi Djofna1, , Merlain Houketchang Bouyo2, Daouda Dawai3, Rigobert Tchameni1, Landry Kouedjou4, Martial Periclex Tchunte Fosso1 and Hervé Brice Fotso Kengne1

1Department of Earth Sciences, Faculty of Science, University of Ngaoundéré, P.O. Box 454, Ngaoundéré, Cameroon

2Centre for Geological and Mining Research, PO Box 333, Garoua, Cameroon

3Department of Earth Sciences, Faculty of Science, University of Maroua, P.O. Box 814, Maroua, Cameroon

4Department of Geography, Faculty Of Arts, Letters And Social Sciences, University of Ngaoundéré, P.O. Box 454, Ngaoundéré, Cameroon

Pub. Date: June 26, 2022
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Cedric Roth Happi Djofna, Merlain Houketchang Bouyo, Daouda Dawai, Rigobert Tchameni, Landry Kouedjou, Martial Periclex Tchunte Fosso and Hervé Brice Fotso Kengne. Contribution to the Petrogenesis of Pan-Africain Granitoids from East Pitoa in the Northern Cameroon Domain of the Central Africain Fold Belt: Implications for Their Sources and Geological Setting. Journal of Geosciences and Geomatics. 2022; 10(3):112-125. doi: 10.12691/JGG-10-3-1

Abstract

This article presents original geological and geochemical data on more or less deformed granitoids rocks of the Pitoa region in Domain North Cameroon. The Pitoa granitoids consist of leucocratic, gray and pink colored, fine to medium grained granites as well as quartz monzonite, containing numerous enclaves of mafic rocks, intruded in gneiss and amphibolite and cut by dykes of pegmatite, aplite and dolerite. They present porphyritic, inequigranular, granophyric and microgranophyric textures consisting essentially of quartz, K-feldspar, plagioclase, biotite and the accessory minerals are zircon, apatite, titanite and opaque minerals. The Plutonic rocks of Pitoa show the characteristics of the shoshonitic and calc-alkaline series with high-K content. They are magnesian to ferrous, luminous to slightly hyper-luminous metallic and exhibit the characteristics of type 1 granitoids. REE data and normalized chondritic plots show variable enrichment of all rocks in LREE compared to HREE with a negative europium anomaly (Eu/Eu*= 0.19 – 0.8), except for the pink granite sample DS15 which shows a positive Eu anomaly (14.6). They are distinctively depleted in Th, Nb, Ba, Sr, Ti and Ta. The data indicate that this assemblage of granitic rock did not result from the simple differentiation of a common parental magma, but show that the plutonic rocks of Pitoa arose from different crustal protoliths. Trace element and major composition are consistent with the magmatism which may have involved reworking of a composite protolith of metagrey-wackes in the upper crust and amphibolitised high -K calc-alkaline basaltic andesites in the northern domain of the Orogenic belt from Central Africa. These granitoids were set up in a tectonic context of continental subduction collision. They are emplaced in the active continental margin and fractional crystallization (FC) is a major process that controls magmatic differentiation.

Keywords

petrography, geochemistry, north cameroon domain, pan-african granitoids, geodynamics

Copyright

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