Geosciences Research

Download PDF (1650.9 KB) PP. 226 - 235 Pub. Date: November 1, 2017

DOI: 10.22606/gr.2017.24002

• A.A Oghuma^*
  Department of Geological Sciences, Nnamdi Azikiwe University, P. M. B. 5025 Awka, Anambra State, Nigeria
• I.I. Obiadi
  
  Department of Geological Sciences, Nnamdi Azikiwe University, P. M. B. 5025 Awka, Anambra State, Nigeria
• C.M Obiadi
  
  Department of Geological Sciences, Nnamdi Azikiwe University, P. M. B. 5025 Awka, Anambra State, Nigeria
• C.N. Nwokeabia
  
  Department of Geological Sciences, Nnamdi Azikiwe University, P. M. B. 5025 Awka, Anambra State, Nigeria

Evaluation and structural interpretation of aeromagnetic anomalies over parts of Monguno and environs, northeastern Nigeria was carried out using 3-D Euler deconvolution to determine the presence, distribution and depth of intrusives in the area. Analysis of maps and images provided the basis for qualitative as well as quantitative interpretations of the aeromagnetic data so as to obtain information on the presence, depth and distribution of intrusives in the area. Results from the 3-D Euler deconvolution of the aeromagnetic data showed predominantly geologic sources of magnetic anomalies for horizontal cylinder and pipe, spheres, sills and dykes, in order of decreasing magnitude, having structural indices (SI) of 2, 3 and 1 respectively. To a lesser degree are sources of magnetic anomalies for contact, having SI of 0, which may be interpreted to be deep seated faults, which have significantly affected the basement rocks surface configuration. The average depth to which magnetic intrusions occur within the sedimentary formations across all SI is less than 500m. Mineralization may be prevalent in the study area as indicated by the presence of these intrusives, some of which occur at favourable depths that allow for economic extraction.

Aeromagnetic anomalies, Euler deconvolution, intrusives, Monguno and Chad Basin.

[1] Burke, K., 1976. The Chad Basin: an active intra-continental basin. Tectonophysics, vol. 36, 197–206.

[2] Genik, G.J., 1992. Regional framework, structural and petroleum aspects of rift basins in Niger, Chad and the Central African Republic. Tectonophysics, vol. 213, 169-185.

[3] Moumouni A., Obaje, N.G., Chaanda, M.S. and Goki, N.G., 2007. Geochemical evaluation of the hydrocarbon prospects in the Nigerian sector of the Chad Basin. Petroleum Science Research Progress, Nova Science Publishers, New York, 1–12.

[4] Nwankwo, C.N., Ekine, A.S. and Nwosu, L.I., 2009. Estimation of the heat flow variation in the Chad Basin Nigeria. Journal of Applied Science and Environmental Management, vol. 13 (1), 73-80.

[5] Obaje, N.G., Abaa, S.I., Najime, T. and Suh, C.E., 1999. Economic geology of Nigerian coals resources—a brief review. African Geoscience Review, vol. 6, 71–82.

[6] Okosun, E.A., 1995. Review of the geology of Borno Basin. Journal of Mining and Geology, vol. 31 (2), 113–122.

[7] Okosun, E.A., 2000. A preliminary assessment of the petroleum potentials from Southwest Chad Basin, Nigeria. Journal of Geology, vol. 2 (2), 40–50.

[8] Reid, A.B., Allsop, J.M., Granser, H., Millet, A.J., and Somerton, I.W., 1990. Magnetic interpretation in three dimensions using Euler deconvolution, Journal of Geophysics, vol. 55, 80–91.

[9] Thompson, D.T., 1982. EULDPH: a new technique for making computer-assisted depth estimates from magnetic data. Journal of Geophysics, vol. 47, 31-37.

[10] Wright, J.B., Hastings, D., Jones, W.B. and William, H. R., 1985. Geology and mineral resources of West Africa. George Allen and Erwin, London, 187 pp.