Neoarchæan crustal evolution in the Congo Craton: evidence from K rich granitoids of the Ntem Complex, southern Cameroon

R. Tchameni (1, 2) , K. Mezger (3, 4) , N. E. Nsifa (2) , André Pouclet (1)

1 ISTO - Institut des Sciences de la Terre d'Orléans
2 UN-FS - Département des Sciences de la Terre [Univ Ngaoundéré]
3 MPIC - Max-Planck-Institut für Chemie
4 Institut für Mineralogie, Zentrallabor für Geochronologie

The Neoarchæan (2.6 Gal K rich granitoids of the Ebolowa area (Ntem Complex, Congo Craton) in southern Cameroon form small massifs trending north-northwest-south-southeast to north-south and contain xenoliths of the surrounding tonalite-trondhjemite-granodiorite (TTG) series and of the greenstone belt country rocks. The granitoids range in modal composition from granodiorite to granite and leucogranite. The rocks display high SiO2 (69–76.5%), Na2O+K2O (5.5–9.1 %) and K2O/Na2O (0.5–1.9). They are metaluminous to slightly peraluminous (0.9

Domains: Mineralogy

R. Tchameni, K. Mezger, N. E. Nsifa, André Pouclet. Neoarchæan crustal evolution in the Congo Craton: evidence from K rich granitoids of the Ntem Complex, southern Cameroon. Journal of African Earth Sciences, 2000, 30, pp.133-147. ⟨10.1016/S0899-5362(00)00012-9⟩. ⟨hal-00115212⟩