Browsing by Author "Adekeye, Jacob Ishola Dele"

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    Geochemical Assessments of Owa-Kajola Marble, Southwestern Nigeria.
    (2020) Adedoyin, Adeonipekun Dele; Ojo, Olusola Johnson; Adekeye, Jacob Ishola Dele; Alebiosu, Mercy Titilayo
    Extensive deposit of dominantly calcitic marble occurs around Owa-Kajola, Sheet 224 (Osi) NW, south-western Nigeria. Geological field mapping on scale 1:10,000 showed that the marble is intercalated with variably migmatized gneisses, pelitic to semi-pelitic schists, amphibolite, and quartzite, all of which are intruded by late- to post- Pan African granite and pegmatites. Geochemical investigations of the marble were done with a view to ascertaining its industrial applications for national development. Results show that the marble, for which there is no published work, is white, with well-interlocked sub-hedral to euhedral crystals, and medium- to coarse-grained. The physical properties also indicate that it can be used in the production of scouring soap, glass, tooth paste, rubber, polished stones, and lime. The relatively low MgO content against CaO, Slica-Alumina Ratio, Silica Modulus, and the Total Alkali content make the deposit adequate for cement production. The combined high CaO and the low P (<0.1%) and S (<0.5%) make the deposit applicable in the steel industry but the low dolomite content may disqualify it for being used as refractory lining in metallurgical engineering. The amounts of the components of marble such as CaO, MgO, SiO2, P2O5, Fe2O3, Na2O and K2O are within the tolerable limits for the production of Portland Cement while the low levels of P(0-0.1), Pb (<5ppm), U (<0.4ppm) and other deleterious elements make such an industrial venture environmentalfriendly.
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    Geological and Geochemical Assessment of Stream Sediments of Ejuku Area.
    (2016) Alebiosu, Mercy Titilayo; Adekeye, Jacob Ishola Dele; Adedoyin, Adeniopekun Dele
    Geological and Geochemical assessments of Ejuku area, North-Central, Nigeria, was carried out with the aim of identifying the mineralization potential as well as delineating mineralized zones in the area. The geological investigation revealed that the area is underlain by porphyritic granite, medium-coarse granite, granitic and banded gneisses, amphibolite, quartzite and mica schist. Twenty five representative stream sediment samples were digested in aqua regia solution and analyzed by ICP-MS method for trace and rare earth elemental concentrations. The analysis of the stream sediment samples, revealed the following range of concentration for each element: Fe (0.59-4.97%), Mn (60-1273 ppm), Ce (19.3-608 ppm), La (2.5-307.5 ppm), Ba (8.5-149.8 ppm), Cr (9.0-125.2 ppm), V (3-121 ppm), Cu (6.78-40.10 ppm), Pb (2.18-30.19 ppm), Zn (3.7-44.0), Ag (2-24ppb), Ni (2.9-13.6 ppm), Co (0.9-18.6 ppm), U(0.57-11.18 ppm), Th (3.0-76.5 ppm), Rb (5.7-46.9 ppm), Au (0.2-0.9 ppb), Y (0.81-27.79 ppm) and Li (1.2-17.2 ppm). The correlation coefficient for the selected elements show very strong correlation between Pb, Co, Fe, Ba and Mn as well as between Th, La, Rb, Ce, Zn and Y. The isograde plots show that most elements have their peaks in the western and northeastern part of the study area. The study therefore revealed that the area is rich in manganese, iron, K-feldspar and mica which are hosted, possibly, by schist and amphibolites.