Hydrothermally altered granitoids in the Batouri district host gold mineralization. Gold and associated metals occur as disseminated, stockwork and veins. The granitoids range from quartz-alkali granitoids sensu stricto to diorite with various types of wallrock alterations including K-feldspar alteration, sericitization, silicification, and sulphidation/ferruginization. Most gold-bearing samples are extensively brecciated. Gold mineralization is accompanied with sericitization, silicification, and sulphidation/ferruginization alterations. Gold concentrations reach a high of 103.7 ppm. The granitic rocks are sub-alkaline. They show enrichment in the LREE, a negative Eu anomaly and a depletion in the HREE reflecting the breakdown and mobility of the initial plagioclase feldspar bearing HREE during fluid-rock interaction. On multielement variation diagrams, spikes at K, Ba, Pb, and Th are depicted resulting from selective enrichment during alteration. Mass gains/losses during alteration calculated using the immobile element method indicate, amongst others, gains in SiO 2 (silicification), K 2 O (K-feldspar alteration), SO 3 and Fe 2 O 3 (sulphidation/ferruginization) with losses in Na 2 O linked to sericitization. The samples show Pd and Pt as high as 2 ppm. Gold mineralization is associated with wallrock alteration zones with elevated contents of As-Ba-Cu-Pb-Rb-Sr-Zn and Zr due to the neominerals developed during hydrothermal alteration. Au-Ag-Zn defines a potential pathfinder element cluster in the Batouri district.

The Kambélé auriferous pluton in south-eastern Cameroon is within the Central African Fold Belt (CAFB). New zircon LA-ICP-MS U-Pb ages, REEs patterns, zircon Ce 4+ / Ce 3+ ratios, and Ti-in-zircon thermometry, have been used to decipher the timing of mineralisation, redox conditions and emplacement temperature of the pluton. Cathodoluminescence images of 12 representative zircon grains from the Kambélé pluton reveal two types of zircon grains: type 1 grains are characterized by dark cores, serrated margins and poorly defined zonation; type 2 grains are euhedral to subhedral, elongated, with core to rim zonation and with darker rims indicative of a pristine magmatic source. The zircon grains are depleted in light rare earth elements. Chondrite-normalised REE patterns show undefined Ce anomalies and negative Eu anomalies indicating moderately oxidised to reduced conditions. Zircon U-Pb age of the granitoid is constrained to Neoproterozoic with a mean age of 589±36 Ma indicating gold mineralisation during the Pan African orogeny. Crystallization temperatures range from 525-1033°C with a mean temperature of ~712°C, concomitant with granitoid emplacement temperatures within the Adamawa Yadé Domain of the CAFB.

The garnet amphibolites, from the Akom II area in the Archaean Congo Craton, were examined to determine the geochemical affinity and tectonic environment. The study uses mineral assemblages and whole-rock geochemistry to identify the geochemical affinity and tectonic setting of the amphibolites associated with monzogabbro and pyroxenites. The studied rocks of Akom II are garnet amphibolites. Mineralogically, the rocks contain hornblende + plagioclase + garnet ± quartz ± epidote ± apatite ± opaque, indicating that they could have been formed from a basic igneous protolith. The geochemical signature indicates that the rocks are tholeiitic in nature. They are similar to the metamorphosed equivalents of ocean island basalts (OIB), with characteristics typical of Volcanic Arc-Basalt (VAB). The geotectonic diagrams confirm the tholeiitic nature of these amphibolites. High field strength elements ratios (Nb/Ta) range from 14-16, which corresponds to Volcanic Arc Basalt (VAB). The primitive mantle normalized patterns of these rocks show negative anomalies in Ta and Ti suggesting a geotectonic signature characteristic of a subduction zone, consequently suggesting the existence of a suture zone in the study area.