eng Science and Education Publishing Journal of Geosciences and Geomatics 2373-6704 2020-03-03 8 1 15 24 10.12691/jgg-8-1-3 JGG2020813 article Robinson Tchatchueng tchatchuengrobinson@yahoo.com 1 Habib Dadjo Djamo 2 Timol¨¦on Ngnotu¨¦ 2 Evine Laure Tanko Njiosseu 2 Mamadou Traor¨¦ 3 Cyriel Moudioh 4 Herv¨¦ Wabo 5 C¨¦dric Djeutchou 5 Jean Paul Nzenti 5 Department of Earth Sciences, University of Dschang, P.O. Box 67 Dschang, Cameroon Institute for Geological and Mining Research, P.O. Box 4110 Yaounde-Cameroon University of ?ukurova, Department of Geological Engineering, Sar??am, Adana, Turkey Department of Earth Sciences, University of Yaound¨¦ I, P.O. Box 812 Yaound¨¦ Department of Geology University of Johannesburg-South Africa, P.O. Box: 524 Auckland Park 2006 Gauteng APK Campus The Endengue iron formations (IFs) belong to the Archaen Ntem greenstones belt at the NW edge of Congo craton and comprise magnetite-bearing gneiss associated with biotite-pyroxene gneiss and intruded by biotite granite and charnockite. The studied IFs are fine-grained; weak foliated rocks, composed of quartz-pyroxene-magnetite-plagioclase mineral assemblages, suggesting high-grade metamorphism. Whole-rock geochemical composition reveals that iron and silica are the main chemical components of the studied IFs with an average TFe2O3 + SiO2 of 93.06 wt-%, suggesting the purity of the chemical precipitation. In addition, the high average Si/Al (38.69); Fe/Ti (766.83) and Fe/Al (56.36) ratios and the Fe/Ti vs Al/(Al+Fe+Mn) plot suggest that the major components (> 80%) of the Endengue IFs are predominantly hydrothermal in origin. However, the slightly high Al2O3+TiO2 content (average of 2.14 wt-%) suggested a detrital input during their deposition. The studied IF samples with an average Total Fe content of 39.40 wt-%, low gangue (34.68 wt-% SiO2 and 1.05 wt-% Al2O3) and deleterious (P2O5: 0.07 wt-%) elements contents, correspond to accepted commercial low grade siliceous ore by global standards. The Edengue IFs shared chemical similarities with other Precambrian IFs worldwide. http://pubs.sciepub.com/jgg/8/1/3/jgg-8-1-3.pdf iron formation chemical precipitation hydrothermal origin low grade siliceous ore Ntem complex southern Cameroon