Petrography, Sedimentology and Geochemistry of Rocks and Sediments from Three Key Localities from the South-East Region of the Yaoundé Group (Centre Region, Cameroon): Implications for Rutile Exploration

The Otele, Matomb and Nguibassal localities correspond to the SW part of Yaounde Group. Field observations, rocks stream sediments study area were examined using rock tin sections, granulometric, morphoscopic X-ray fluorescence analysis identify their distribution, nature basement, provenance useful minerals some weathering process that affect them show exploration significance of these outcomes. From it appears that, three types occur in the areas: gneisses, micaschists amphibolite, respectively with following minerals assemblage: (Fks + Bt Qz Ky Pl Msc Grt Op), (Bt Msc + Fks Op Grt) (Amp Kfs Px Op). Sedimentological analyses reveal dominance unworn grains rutile quartz kyanite suggest a short transport; while less abundant minor shiny dulls sub-rounded long transport. Sediments collected are homometric, well sorted, classified, with immature rutile due angular shapes. Silica is most important major element ranging concentration between 47.56 wt% SiO2 amphibolite 61.21 in gneiss. Stream chemistry equally showed that silica alumina are remarkable elements values 53.92 wt% 13.33 increase TiO2 between 51.77 95.03 wt%. The TiO2 percentage met global fraction rutile concentrate come from same rock, increases when linked heavy observation suggested the Ti mainly rutile. Impurities present lattice include: V, Nb, Ta, Cr CaO. Rutile was found but several source (Felsic mafic). High Nb contents (277 - 768.33 ppm) as compared (394 444.33 ppm) associated elevated ratio of LREE/HREE coupled negative Eu anomalies indicative felsic source material. Moreover, enrichment Nb at Nguibassal suggested originate mafic rocks.