Ground Magnetic Profiling for Delineating Ore & Marble Deposits Within Okpella, Southern Nigeria

Authors

  • Emenike, K. Ambrose Alli University, Ekpoma, Edo State, Nigeria.
  • Aigbedion, I. Ambrose Alli University, Ekpoma, Edo State, Nigeria.
  • Akherevebhu, O. Department of Geophysics, Ambrose Alli University, Ekpoma, Edo State, Nigeria.
  • Ozegin, K. O. Ambrose Alli University, Ekpoma, Edo State, Nigeria.
  • Ataman, O. J. Ambrose Alli University, Ekpoma, Edo State, Nigeria.
  • Aigbedion, E.O. University of Port Harcourt, Nigeria.
  • Shaibu I. Federal University Gusau, Nigeria.

DOI:

https://doi.org/10.57233/ijsgs.v10i1.592

Keywords:

Mignatite gneiss-quartzite, Total magnetic intensity, Igara Schist belt, Marble, Ore

Abstract

  1. Ground magnetic profiling was deployed to delineate the occurrences of ore and marble minerals within the study area, Okpella, Edo state, Southern Nigeria. Air borne magnetic survey data (Aeromagnetic) was processed and used to identify zones with magnetic anomalies and obtain the lineament of the area. This was tied to the geological mapping data in order to determine best traverse lines. Ground Magnetic data capturing was conducted in the East-West direction, perpendicular to marble strike direction. Geological and Total magnetic intensity (TMI) maps were generated using Arc GIS and Oasis Montaj software respectively. Structural interpretation of the study area defined twenty two (22) major fault systems, dominantly in the direction, Northeast (NE) - Southwest (SW) and Northwest (NW) – Southeast (SE) as well as minor faults, fractures and folds. Geologic mapping and magnetic survey information defined three (3) geological formations namely; the migmatite gneiss – quartzite (MGQ), granite gneiss (GG), meta-volcanics with mafic intrusive rocks (MVM). Migmatite gneiss- quartzite - Tertiary age Alluvium (MGQ) is characterized with negative magnetic susceptibility ranging from -305.4 nT to -33.4 nT, indicative of destruction of magnetic minerals resulting from the increase in temperature during post orogenic activities. Granite gneiss showed intermediate magnetic susceptibility ranging from -33.5 nT to 85.5 nT, while the meta-volcanic and mafic intrusive (MVM) rock units show high magnetic susceptibility >85.5 nT. Marble deposits targets occurred within granite gneiss - meta-volcanic - mafic intrusive contacts within the study area. The interpreted alteration zones, structures and geology are path finders of marble zones in the migmatite-gneiss-schist-quartzite complex. Marble bodies thickness ranges from 1.63 – 16.2 m for shallow deposits and >16.2 for deeper deposits and an average lateral extent of 20.75 m. It is recommended that core drilling be carried out to validate the findings of the ground geophysical survey.

Author Biographies

Emenike, K., Ambrose Alli University, Ekpoma, Edo State, Nigeria.

Department of Geophysics, Ambrose Alli University,

Ekpoma, Edo State, Nigeria.

Aigbedion, I., Ambrose Alli University, Ekpoma, Edo State, Nigeria.

Department of Geophysics,

Ambrose Alli University, Ekpoma, Edo State, Nigeria.

Akherevebhu, O., Department of Geophysics, Ambrose Alli University, Ekpoma, Edo State, Nigeria.

Department of Geophysics,

Ambrose Alli University, Ekpoma, Edo State, Nigeria.

Ozegin, K. O., Ambrose Alli University, Ekpoma, Edo State, Nigeria.

Department of Geophysics, Ambrose Alli University, Ekpoma, Edo State, Nigeria.

Ataman, O. J., Ambrose Alli University, Ekpoma, Edo State, Nigeria.

Department of Geophysics, Ambrose Alli University, Ekpoma, Edo State, Nigeria.

Aigbedion, E.O., University of Port Harcourt, Nigeria.

Offshore Technology Institute, Access and Renewable Engineering, University of Port Harcourt, Nigeria.

Shaibu I., Federal University Gusau, Nigeria.

Department of Geological Sciences,

Federal University Gusau, Zamfara State, Nigeria.

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Published

2024-03-31

How to Cite

Emenike, . K., Aigbedion, I., Akherevebhu, O., Ozegin, . K. O., Ataman, O. J., Aigbedion, E., & Shaibu , . I. (2024). Ground Magnetic Profiling for Delineating Ore & Marble Deposits Within Okpella, Southern Nigeria. International Journal of Science for Global Sustainability, 10(1), 49–61. https://doi.org/10.57233/ijsgs.v10i1.592