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Articles by T.R. Ajayi
Total Records ( 2 ) for T.R. Ajayi
  F.M. Adebiyi , F.S. Olise , O.K. Owoade , I.B. Obioh , T.R. Ajayi , H.B. Olaniyi and O.I. Asubiojo
  Ethylenediamine Tetra-acetic Acid (EDTA) extractable metals were determined in soils of bituminous sands occurrence area of Agbabu in southwestern Nigeria using Total reflection x-ray Fluorescence (TXRF) technique. Soil samples were collected at two different depths (0-50 and 50-100 cm) along a transverse line cutting across the main road in the study area. Fourteen metals; K, Ca, Ti, Mn, Fe, Ni, Cu, Zn, Rb, Sr, Ce, Eu, Au, Pb and Co were detected in all. However, Co, Pb and Ni were not detected in samples from 0-50 cm depths and Pb and Rb in some samples from 50-100 cm depths. The concentration, mean, range, standard deviation and correlation coefficients were calculated for the detected metals. Moderate correlations were found to exist between K, Ti, Ni, Zn, Rb and Sr; very high correlations between Ca, Cu Pb and Au in 0-50 cm depth samples. In the 50-100 cm depth samples, moderate correlations were observed between Ca, Cu and Zn; between Fe, Ti, Co and Ni. Pb was found to be highly correlated to Ca, Ti, Ni and Sr. This study provides a pre-exploration baseline data in the region and the need for the extension of such a baseline analysis to other environmental sensitive media-water resources, crops and local air quality in the region is emphasized.
  T.R. Ajayi , A.A. Oyawale , F.Y. Islander , O.I. Asubiojo , D.E. Klein and A.I. Adediran
  Geochemical data of two borehole samples that penetrated Oshosun formation in Oja-Odan area located in the western part of the Dahomey basin of SW Nigeria were studied. A total of twenty-nine elements, comprising three major, twenty trace and six rare earth elements were considered with the objective of determining the distribution pattern, source rocks and the environment of deposition of the sediments. The results showed that the mean concentrations for Fe, Na and K are 3.725, 0.073 and 0.683 wt.%, respectively. The relatively high Fe content is attributed to accumulation of goethite in the phosphatic shales of the formation. The absolute REE concentrations are in the order of clay>grey shale>black shale. On the average, the patterns indicate that the sediments were derived from granite and grey gneiss of nearby basement rocks but their accumulation was strongly controlled by mechanical and chemical processes of sedimentation. Trace element data on Cr and Co shows that the sediments of Oshosun formation are argillaceous and were deposited in a shallow oxygen poor environment consistent with the model of structural framework of a series of horst and grabens of the Dahomey basin.
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