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

Abstract : 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
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Submitted on : Monday, November 20, 2006 - 4:11:31 PM
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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, Elsevier, 2000, 30, pp.133-147. ⟨10.1016/S0899-5362(00)00012-9⟩. ⟨hal-00115212⟩

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