The Magba Shear Zone is made up of granites, migmatites, orthogneiss, metagabbro, mafic dyke and mylonites with coarse grained texture, porphyroblastic, granoblastic, cataclastic and mylonitic texture respectively. Structural features and kinematic indicators testify the syntectonic emplacement of Magba granitoids and also provide detailed information on the relative timing of deformation as follows: (1) D1 of tangential movement immediately followed by (2) the D2 phase which is heterogeneous simple shear in dextral transpressive context with a NW-SE direction (3) D3 tectonic phase is marked by sinistral transpressive tectonic and superposed folding with a NE-SW kinematic direction. Combined ductile NE-SW shear movements and NW-SE compressional movements defined a transpressional tectonic regime during the D3 deformation (4) A brittle stage D4 is controlled by transcurrent tectonics and responsible for the emplacement of faults, and joints. The Magba granites would have intruded along sub-vertical mid-crustal feeder channels and were emplaced as a sheet or sheets along the shear zone during the early stage of the C3 shearing, followed by gabbro and mafic dyke at the late stage. Strike-slip dilatancy pumping under transpressive tectonic is suggested as a possible mechanism for the emplacement of the Magba granites.

Mount Cameroon is a Plio-Quaternary volcanic massif, without a central crater, made up ofmore than 140 pyroclastic cones. It is one of the active volcanoes of the Cameroon Line. Mount Cameroon magmatic inclusions are found in microdroplets trapped in the early minerals (olivines) from the pyroclastic products. The analysis of these magmatic inclusions allowed us to find primitive liquids compared to lavas. Major elements study of the magmatic inclusions, trapped in the most magnesian olivines (Mg#84-86) of Mount Cameroon revealed "primitive" liquids of basanite and alkaline basalt type with variable composition compared to the much more uniform basalts of the magmatic series of Mount Cameroon. The study of these trapped liquids shows that:  (i)- the original primitive lavas did not undergo the process of evolution by FC, but rather underwent fundamentally (or exclusively) the process of partial melting; (ii) the emitted lavas, evolved essentially by FC; (iii) the variations in the trace element contents of the primitive liquids directly reflect a variation in the rate of partial melting of a homogeneous mantelic source. The very high La/Yb ratios of the Mount Cameroon inclusions (> 20) characterize a garnet lherzolite source. Spectra of the magmatic inclusions show a negative anomaly or depletion in K, Rb and Ba as those of HIMU. The "primitive" liquids and lavas of Mount Cameroon represent a co-genetic sequence formed by varying degrees of partial melting of a source considered as homogeneous.

Magba granitoids are made up of granites, orthogneiss, migmatites, metagabbro, mafic dykes and mylonites with respectively porphyritic, porphyroblastic, grano-lepido-porphyroblastic, and cataclastic texture. Mafic dykes and metagabbro occur as intrusives into the mylonitic and granitic rocks. Magba rocks were subjected to whole rock geochemistry analyses and results show that those rocks have the chemical composition of gabbro, monzodiorite, monzonite syenite, quartzmonzonite, granodiorite and diorite. The rocks are metaluminous, display high-K, calc-alkaline to shoshonitic affinities and plot on the field of volcanic arc granites and are formed by differentiation of I-type magma. They are largely situated within the syn-collision to within plate fields, show a subduction-to collision-related magmatism, and suggest their emplacement during the syn-to post-collisional phase of the Pan-African orogeny.

The rise in industrialization and infrastructural development is increasing leading to a constant need for construction materials; however, some of these materials continue to pose a problem to the concerned environments. There is a need to search for materials that will reduce environmental degradation and ensure sustainability. Natural pozzolanic materials possess certain characteristics such that their use in mortar and cement production could reduce the emission of carbon dioxide (CO2) due to the transformation of limestone (CaCO3) into lime for production of Portland cements. Colossal deposits of volcanic pozzolan outcrop in the Njimbouot II locality and the characterization of those materials is vital in deciphering their suitability in cement production as a construction material for sustainable development. Grinding is the only treatment performed on pozzolans in order to increase their specific surface area and reactivity. The rate of substitution of cement with pozzolan in the samples varied from 0%, 10%, and 15% to 25%. Mechanical tests were carried out after 7, 28 and 90 days on mortar specimens (4 × 4 × 16 cm3). Results revealed the presence of amorphous phases. The activity index obtained was approximately 75% and the lapilli and volcanic ash in this area are classified as pozzolans (classification ASTM C618). Regardless of the rate of substitution, the mechanical proprieties of mortars are observed to increase with age. The compressive strength values changed from 33.72 to 52.5 MPa while the flexural strength evolved from 5.62 to 8.29 MPa revealing that the Njimbouot II Pozzolan are advantageous in the manufacture of ecological cements.