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Home  >  Transactions of NAMP VOL.12

22. INVESTIGATION OF LIMESTONE DEPOSIT AT OJIRAMI MIXED SECONDARY SCHOOL, OJIRAMI, AKOKO EDO LOCAL GOVERNMENT AREA, EDO STATE USING ELECTRICAL RESISTIVITY IMAGING METHOD by Airen O.J., Iwere O.F. and Iyere P.S. Volume 12, (July – Sept., 2020 Issue)
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INVESTIGATION OF LIMESTONE DEPOSIT AT OJIRAMI MIXED SECONDARY SCHOOL, OJIRAMI, AKOKO EDO LOCAL GOVERNMENT AREA, EDO STATE USING ELECTRICAL RESISTIVITY IMAGING METHOD
Airen O.J., Iwere O.F. and Iyere P.S.
Department of Physics, Faculty of Physical Sciences, University of Benin, Benin City, Nigeria
Abstract
Geophysical investigation was carried out at Ojirami Mixed Secondary School, Ojirami, Edo State. This was done with a view to target an essential mineral like limestone. Electrical Resistivity Tomography (ERT) method was used for this survey.
Preliminary investigation was done in the location at Ojirami, Akoko Edo Local Government Area, Edo State by carrying out reconnaissance survey to ascertain the extent of outcrop of this very important mineral. A series of 2D apparent resistivity data were then acquired by using Wenner-Alpha electrode configuration. Electrode separation of (a) = 10m, 20m, 30m, 40m, 50m, 60m for each profile line was obtained. The total length of investigation was taken as 200m. The 2D data sets were inverted separately using RES2DINV software producing 2D model for each line. The total depth attained for the four profile lines was 39.6m.
The minerals that fall within the resistivity range 86.4-2609 Ωm observed from the models are, Clay, Clayey Sand, Limestone and Sandstone. The resistivity obtained for profile 1 was 113.7-372 Ωm at a depth of 18.85-30.9 m indicative of limestone. The resistivity obtained for profile 2 was 111-386 Ωm at a depth of 0-21.9 m indicative of limestone. The resistivity obtained for profile 3 was 118-393 Ωmat a depth of 0-24.9m indicative of limestone.  The resistivity obtained for profile 4 was 118.9-429Ωm at a depth of 0-32 m indicative of limestone. It is observed that limestone is the predominant mineral in Ojirami and its environs from both its presence in substantial amount as outcrop and even deep to the earth subsurface.
Keywords: Tomography, limestone, resistivity, wenner configuration, outcrop.
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