Laterization Process Recognition along the Northern Border of the Congo Craton by Geoelectrical and Geotechnical Data

With the properties of laterites being related to nature rock from which they are derived, twenty vertical electrical surveys and boreholes for geotechnical tests, distributed in two units (plutonic green belt zones) Ntem complex located at northern limit Congo Craton, were implemented study formation process this geological structure. The inversion geoelectrical data plutonic area resulted three lateritic layers with resistivities 1090 Ω·m, 1302 1122 induration leaching indices 28.9% 72.56%. In zone, also identified 1080 943 1158 28.8% 72.55%. similarities geomechanical parameters (induration lixiviation indices) show that these soils experienced similar weathering patterns during same period, confirmed by CBR values, corresponding PF3 platforms can be used road works. However, average resistivity values different (1171.77 Ω·m 1061.16 areas) reflect observed differences bedrock alterations (3413.51 1569.32 areas), showing derived weathering. addition, permeability obtained zone ( k = 6.24 E − 05 cm/s) id="M2"> 5.82 confirm difference. reduction difference between compared highlights over a long period.