TITLE:
Petrogenesis and Geochemical Characterization of the Granitoids of the Magba Shear Zone West Cameroon Central Africa
AUTHORS:
Benjamin Ntiéche, M. Ram Mohan, Amidou Moundi, Mahomed Aziz Mounjouohou
KEYWORDS:
Magba, Granitoids, Metaluminous, Syn-Collision
JOURNAL NAME:
Open Journal of Geology,
Vol.6 No.8,
August
18,
2016
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.