Statistical Studies of Soil Geochemical Data from Gbongan-Odeyinka Area, Southwestern Nigeria

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In order to follow up some geochemical anomalies discovered in a regional stream sediment survey in parts of southwestern Nigeria, a medium density geochemical soil survey was carried out in Gbongan-Odeyinka area of Osun State, southwestern Nigeria. As a result, soil geochemical data on 13 elements (Ag, As, Au, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Sn, and Zn) obtained from 186 samples from the study area were subjected to statistical analysis involving frequency distribution, Pearson correlation and R-mode varimax rotated factor analysis techniques. The frequency distribution plots revealed that all the elements investigated except Ag and Fe, which display approximately normal distribution, are positively skewed with Au and Zn being the strongest. The Pearson correlation study and factor analysis enabled separation of the 13 elements into the following three factors or metal associations: 1) Pb-Co-Ni-Fe-Cr- As-Mn-Cu; 2) Sn-Ag-Au-Cd; and 3) Zn-Cd, which are interpreted to reflect the influence of both environmental and mineralization factors on the soil of the study area. Of the three associations only the Sn-Ag-Au-Cd is considered related to metallic mineralization in the study area based on the existing knowledge of Au and Sn mineralization in the adjacent Ife-Ilesa area.

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