Evidence of heterogeneous crustal origin for the Pan-African Mbengwi granitoids and the associated mafic intrusions (northwestern Cameroon, central Africa) - 04/03/16
, Pierre Kamgang b, Michel Grégoire c, Emmanuel Njonfang d, Mathieu Benoit c, Zénon Itiga a, Stéphanie Duchene c, Moïse Bessong e, Pauline Wonkwenmendam Nguet a, Ntepe Nfomou aBienvenue sur EM-consulte, la référence des professionnels de santé.
L’accès au texte intégral de cet article nécessite un abonnement.
| pages | 11 |
| Iconographies | 6 |
| Vidéos | 0 |
| Autres | 0 |
Abstract |
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 D1 event in Cameroon.
Le texte complet de cet article est disponible en PDF.Keywords : High-K calc–alkaline plutonics, Metaluminous to weakly peraluminous, Type I, Lower continental crust, Subduction signature, Cameroon
Plan
Vol 348 - N° 2
P. 116-126 - février 2016 Retour au numéro
Article précédent
- Geochemistry and zircon U–Pb geochronology of the ultramafic and mafic rocks emplaced within the anatectic series of the Variscan Pyrenees: The example of the Gavarnie–Heas dome (France)
- Mohammad A. Kilzi, Michel Grégoire, Valérie Bosse, Mathieu Benoît, Youssef Driouch, Michel de Saint Blanquat, Pierre Debat
- Geochemical and palaeoenvironmental characteristics of Missole I iron duricrusts of the Douala sub-basin (Western Cameroon)
- Gilbert François Ngon Ngon, Jacques Etame, Marie Joseph Ntamak-Nida, Cécile Olive Mbesse, Joël Simon Mbai, Élie Constantin Bayiga, Martine Gerard
Bienvenue sur EM-consulte, la référence des professionnels de santé.
L’accès au texte intégral de cet article nécessite un abonnement.
Bienvenue sur EM-consulte, la référence des professionnels de santé.
L’achat d’article à l’unité est indisponible à l’heure actuelle.
Déjà abonné à cette revue ?