• John Megwara
• Solomon Abaa
• Idris Funtua

The combination of mineralogical and geochemical data of sedimentary rocks can reveal the nature of rocks and the tectonic settings of the sedimentary basin. Ironstone deposits cap plateaux around Koton Karfi requiring detailed studies. The survey area is bounded by longitudes 6°48ʹ00ʺ E to 6°52ʹ48ʺ E and latitude 8°05ʹ00ʺ N to 8°10ʹ46ʺ N covering an area of about 96.8 km2. The stratigraphic successions in the study area consist of the basal Lokoja Formation, overlain by the Patti Formation and capped by the Agbaja Formation. The basal Lokoja Formation is a sequence of matrix supported conglomerates and sandstones overlying the Pre–Cambrian Basement. 21 rock samples were collected from the study area. Geochemical analysis of the samples was carried out using x-ray fluorescence. Mineralogical analysis determined the mineral compositions and modal percentages of minerals in the samples. 20 elements and 19 oxides were revealed and they include Al2O3, SiO2, Fe2O3, P2O5, CaO, K2O, V2O5, Cr2O3, Eu2O3, NiO2, ZnO, La2O3, BaO, SrO, CuO, Nd2O3, Re2O7 and PbO. The mineralogical study shows the presence of two petrographic varieties namely the ooidal pack-ironstone and detrital mud-ironstone. The core of the ooids is made up of pseudomorphs of goethite after siderite and hematite after Itabirite.

Framboid, Goethite, Hematite, Itabirite, Magnetite

"Mineralogical and geochemical studies of ironstones around Koton karfi, part of southern Bida Basin, north central Nigeria", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 12, page no.112-134, December-2019, Available :http://www.jetir.org/papers/JETIR1912016.pdf

"Mineralogical and geochemical studies of ironstones around Koton karfi, part of southern Bida Basin, north central Nigeria", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 12, page no. pp112-134, December-2019, Available at : http://www.jetir.org/papers/JETIR1912016.pdf