Abstract
Magba granitoids are made up of granites, orthogneiss, migmatites, metagabbro, mafic dykes and mylonites with respectively porphyritic, porphyroblastic, grano-lepido-porphyroblastic, and cataclastic texture. Mafic dykes and metagabbro occur as intrusives into the mylonitic and granitic rocks. Magba rocks were subjected to whole rock geochemistry analyses and results show that those rocks have the chemical composition of gabbro, monzodiorite, monzonite syenite, quartz-monzonite, granodiorite and diorite. The rocks are metaluminous, display high-K, calc-alkaline to shoshonitic affinities and plot on the field of volcanic arc granites and are formed by differentiation of I-type magma. They are largely situated within the syn-collision to within plate fields, show a subduction—to collision-related magmatism, and suggest their emplacement during the syn—to post-collisional phase of the Pan-African orogeny.
Highlights
Magba area is situated at the junction of the Cameroon Central Shear Zone (CCSZ), the Adamawa Fault (AF) and the Tibati-Banyo Fault (TBF) in Cameroon (Figure 1)
The distribution and disposition of the different litho units of the Magba area are shown in the geological map (Figures 3(a)-(c))
The main results show that Magba zone is made up of granites, orthogneiss, migmatites, metagabbro, mafic dykes and mylonites with porphyritic texture for granites, porphyroblastic to grano-lepido-porphyroblastic texture for orthogneiss, and migmatites, cataclastic texture for mafic dykes and ocelar mylonitic to cataclastic texture for mylonites
Summary
Magba area is situated at the junction of the Cameroon Central Shear Zone (CCSZ), the Adamawa Fault (AF) and the Tibati-Banyo Fault (TBF) in Cameroon (Figure 1). B. Ntiéche et al orogeny of Central Africa; the tectonic significance of widespread Pan-African structures at a regional scale is a matter of debate [1] [2]. The divergent views include the operation of transpressive tectonics during the Pan-African orogeny in the central Cameroon. The disposition of Magba area at the junction of shear zones is very important in understanding the CCSZ kinematic, and the emplacement conditions of these rocks. The current understanding on the petrography, geochemistry and tectonic evolution of the Magba area is very limited To fill this gap we are presenting detailed petrography and geochemistry for Magba granitoids to provide much insight in understanding the nature of these rocks, and their conditions of emplacement
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