Scientific publications
H. L. Ekoro Nkoungou
Jorelle Larissa Méli’i
Daniel Hervé Gouet
V. Oyoa
Eliézer Manguelle Dicoum
Geosciences
The both influence of the Oceanic crust and the pan-African belt on the northern limit of the Congo Craton, made up of the Ntem, Lower Nyong and Ayina units, remains partially described. To do this, the magnetotelluric method which were used for good modeling the southern limit of this Craton, was also deployed through 22 stations distributed over its 3 units. The data process by cascade decimation with a dimensional analysis by the phase of this tensor, allowed to detect a major network of regional faults defining the course of Ntem rivers, highlight the violence of tectonic activity during Eburnean erosion in the Ntem unit, through the undulations of the gneiss-granite. Ripples were also observed in the lower Nyong unit in the geoelectric section, however the dimensional analysis could not confirm them as well as the observation of the resistivity curves according to the two modes, thus showing an anomaly attributable to the mobile zone adjacent to the lower Nyong unit. The depth of the upper limit of the Craton materialized by the granite shield was recorded at 3 km in the unit of the lower Nyong, 3.5 km in the unit of Ayina and 1.5 km in the unit of Ntem, moreover, no major fault has been highlighted in the Ayina and lower Nyong units while a network of major faults defining the course of the Ntem river has been highlighted. These different results have led us to the conclusion of the predominance of the activity of the pan african Mobile belt on the northern limit of the Congo Craton.
