The geological formations of P425 consist largely of sedimentary rocks represented by carbonate and sandstone formations as well as metamorphic ones by shales as well as magmatic intrusions represented by dolerites and covered by some recent alluvium. The regional tectonics that have affected this sector to promote the deformations of these rocks by giving brittle, linear and planar microstructures that attest to the compressive phases that this terrain has experienced, confirmed even in the study of the stresses by WIN TENSOR. The preferred orientation of the stratification planes is NW-ESE (N100°-110°E) and those of the planar elements NW-SE (N120°-140°E) and NW-SSE (N140°-160°E) would justify the existence of a vast contemporary regional folding due to the intrusion of magmatic formations in the region. For linear elements; the statistical study made from the measurements taken showed a single preferential direction NW-ESE (N100°-110°E). The structural analysis of the conjugated fractures encountered in our field of study shows that these joints are largely the result of a compression resulting from the stresses σ2 whose value of the direction is N29 ° E / 8 ° SE.

This article is a contribution to the geochemical characterization of carbonate rocks of the bushimay supergroup in the Lukelenge area. The samples were analyzed by the atomic absorption spectroscopy method and the results are presented in the form of curves and tables. The interpretation makes it possible to specify the usefulness of these rocks in civil engineering works. We present the results of a study that first addresses the cartographic aspect of the geological formations in this sector as well as new geochemical analysis data concerning the major elements. The geological map of the study area will also be presented. The cartographic study of the Lukelenge sector has made it possible to identify three lithological facies which are limestone, dolomitic limestones, dolerite and arkosic sandstones. The geochemical study based on major elements revealed the following average contents: CaO: 46.42%, MgO: 2.51%; Al2O3: 2.20%; SiO2: 8.85% and Fe2O3: 1.05%. This shows qualitatively the importance of the use of these rocks in cement but also in civil engineering works.