Author(s)

Benjamin Ntiéche^1,2*, M. Ram Mohan¹, Amidou Moundi², Mahomed Aziz Mounjouohou²

¹CSIR-National Geophysical Research Institute, Hyderabad, India.
²Department of Earth Sciences, University of Yaounde 1, Yaounde, Cameroon.

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.

Magba, Granitoids, Metaluminous, Syn-Collision

Ntiéche, B. , Mohan, M. , Moundi, A. and Mounjouohou, M. (2016) Petrogenesis and Geochemical Characterization of the Granitoids of the Magba Shear Zone West Cameroon Central Africa. Open Journal of Geology, 6, 812-839. doi: 10.4236/ojg.2016.68063.