Mbassa B. J., Kamgang P., Grégoire Michel, Njonfang E., Benoit M., Itiga Z., Duchene S., Bessong M., Nguet P. W., Nfomou N. (2016). Evidence of heterogeneous crustal origin for the Pan-African Mbengwi granitoids and the associated mafic intrusions (northwestern Cameroon, central Africa). Comptes Rendus Geoscience, 348 (2), p. 116-126. ISSN 1631-0713.
Titre du document
Evidence of heterogeneous crustal origin for the Pan-African Mbengwi granitoids and the associated mafic intrusions (northwestern Cameroon, central Africa)
Année de publication
2016
Auteurs
Mbassa B. J., Kamgang P., Grégoire Michel, Njonfang E., Benoit M., Itiga Z., Duchene S., Bessong M., Nguet P. W., Nfomou N.
Source
Comptes Rendus Geoscience, 2016,
348 (2), p. 116-126 ISSN 1631-0713
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 talc-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.
Plan de classement
Géologie et formations superficielles [064]
;
Géophysique interne [066]
Description Géographique
CAMEROUN
Identifiant IRD
PAR00014564
