<abstract xmlns="http://www.w3.org/1999/xhtml"><p> This geophysical study was carried out to determine the occurrence of phosphate nodules in the Oshoshun Formation of the Dahomey Basin, Southwestern Nigeria. The electrical resistivity method, comprising 1D vertical electrical sounding (VES; using Schlumberger array) and 2D geoelectrical imaging (using Wenner array), was used to determine the nature and depth of occurrence of the phosphate nodules. Six profile lines were established within the study area, and inverted sections were generated from the apparent resistivity data using DIPRO inversion algorithm. Five VES points were also acquired in the study area, and Win- Resist programme was used to process and interpret the field resistivity data. Four pits were dug along the profiles to verify the interpreted results. The results obtained by both techniques reveal similar geoelectric units: the top soil, clay, clayey sand and clay at different depths. These layers host pockets of phosphate nodules (78-≥651 Ωm) with varying thicknesses. The strong correlation between the lithology profiles obtained from the pits and the interpreted results of the inverted apparent resistivity sections demonstrates the efficacy of the electrical resistivity method in characterising phosphate occurrence within the formation.</p></abstract>

This geophysical study was carried out to determine the occurrence of phosphate nodules in the Oshoshun Formation of the Dahomey Basin, Southwestern Nigeria. The electrical resistivity method, comprising 1D vertical electrical sounding (VES; using Schlumberger array) and 2D geoelectrical imaging (using Wenner array), was used to determine the nature and depth of occurrence of the phosphate nodules. Six profile lines were established within the study area, and inverted sections were generated from the apparent resistivity data using DIPRO inversion algorithm. Five VES points were also acquired in the study area, and Win- Resist programme was used to process and interpret the field resistivity data. Four pits were dug along the profiles to verify the interpreted results. The results obtained by both techniques reveal similar geoelectric units: the top soil, clay, clayey sand and clay at different depths. These layers host pockets of phosphate nodules (78-≥651 Ωm) with varying thicknesses. The strong correlation between the lithology profiles obtained from the pits and the interpreted results of the inverted apparent resistivity sections demonstrates the efficacy of the electrical resistivity method in characterising phosphate occurrence within the formation.

A Resistivity Survey of Phosphate Nodules in Oshoshun, Southwestern Nigeria

Materials and Geoenvironment

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"A Resistivity Survey of Phosphate Nodules in Oshoshun, Southwestern Nigeria"}

This geophysical study was carried out to determine the occurrence of phosphate nodules in the Oshoshun Formation of the Dahomey Basin, Southwestern Nigeria....

A Resistivity Survey of Phosphate Nodules in Oshoshun, Southwestern Nigeria

Published Online: Oct 17, 2018

Page range: 103 - 114

Received: Aug 07, 2017

Accepted: Mar 09, 2018

DOI: https://doi.org/10.1515/rmzmag-2018-0006

Keywords
imaging, inversion, Oshoshun, phosphate nodules, resistivity

© 2018 Oluseun Adetola Sanuade, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

A Resistivity Survey of Phosphate Nodules in Oshoshun, Southwestern Nigeria

Published Online: Oct 17, 2018

Page range: 103 - 114

Received: Aug 07, 2017

Accepted: Mar 09, 2018

DOI: https://doi.org/10.1515/rmzmag-2018-0006

Keywordsimaging, inversion, Oshoshun, phosphate nodules, resistivity

© 2018 Oluseun Adetola Sanuade, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
imaging, inversion, Oshoshun, phosphate nodules, resistivity