Scientific publications
Emmanuel Njonfang
Benoît Joseph Mbassa* (Corresponding author)
Zénon Itiga
Moïse Bessong
Pauline Wonkwenmendam Nguet
Ntepe Nfomou
Michel Grégoire
Other affiliations: Observatoire Midi-Pyrénées · Géosciences Environnement Toulouse
Mathieu Benoît
Other affiliations: Observatoire Midi-Pyrénées · Géosciences Environnement Toulouse
Stéphanie Duchêne
Other affiliations: Observatoire Midi-Pyrénées · Géosciences Environnement Toulouse
Comptes Rendus Géoscience
The Mbengwi plutonics consist of intermediate to felsic granitoids forming a continuous magmatic series from monzonite to granite and mafic intrusions. Their mineralogical composition consists of quartz, plagioclases, K-feldspars, biotite, muscovite, and amphibole. The accessory phase includes opaque minerals + titanite ± apatite ± zircon, while secondary minerals are pyrite, phengite, chlorite, epidote, and rarely calcite. These plutonics are assigned high–K calc–alkaline to shoshonitic series, metaluminous to weakly peraluminous and mostly belong to an I–type suite (A/CNK = 0.63–1.2). They are typically post–collisional, with a subduction signature probably being inherited from their protoliths emplaced during the subduction phase. The Sr and Nd isotopic data evidence that these plutonics result from melting of the lower continental crust with variable contribution of the oceanic crust. Their geochemical features are similar to those of western Cameroon granitoids related to the Pan–African D 1 event in Cameroon.
