Geophysical Investigation of Environmental and Engineering Features Using Aeromagnetic Data of Ogoja and Environs Southeastern Nigeria
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Abstract
This study investigates the environmental and engineering implications of linear geologic features in Ogoja and its surroundings using interpreted aeromagnetic data. The regional and residual fields of the aeromagnetic data for the research region were separated using polynomials fitting techniques for first to fourth order. To trace and find the contact linear geologic structures within the study area, high resolution filters such as horizontal derivative (HD), first vertical derivative (FVD), and second vertical derivative (SVD) were used in Edge enhancement filtering for best fit residual anomaly. The depth to anomalous magnetic sources was estimated using the conventional Euler deconvolution approach. According to the findings, the research area is distinguished by near-surface lineaments that occur at maximum depths of 2000 m. Major trends could be seen in the NE-SW direction of the extracted lineaments from FVD and SVD, whereas minor trends aligned in the NW-SE direction. It is impossible to overstate the likelihood that some of the engineering and environmental issues in the research region, such as road failures, house cracks, and gully erosions, may be related to these near-surface geological phenomena
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Benkhelil, J., (1987). Cretaceous deformation, magmatism and metamorphism in the lower Benue trough, Nigeria. Geological Journal, 22, 467¬¬¬¬¬¬¬¬¬¬–493. https//doi.org/10.1002/gj.3350220629
Cratchley, C.R., Louis, P. and Ajakaiye, D.E., (1984). Geophysical and Geological Evidence for the Benue Chad Basin Cretaceous Rift Valley System and Its Tectonic Implications. Journal of Africa Earth Sciences, 2, 141–150.
Ekwok, S.E., Akpan, A.E., Achadu, O.I.M., and Eze, O.E., (2021). Structural and lithological interpretation of aero-geophysical data in parts of the lower Benue Trough and Obudu Plateau, southeast Nigeria. Advances in Space Research Journal, 68, 2841–2854.
Ekwok, S.E., Akpan, A.E., Ebong, E.D., and Eze, O.E., (2021). Assessment of depth to magnetic sources using high resolution aeromagnetic data of some parts of the Lower Benue Trough and adjoining areas, Southeast Nigeria. Advances in Space Research Journal, 67, 2104–2119.
Ekwok, S.E., Akpan, A.E., and Ebong, E.D., (2021). Assessment of crustal structures by gravity and magnetic methods in the Calabar Flank and adjoining areas of Southeastern Nigeria - A case study. Arabian Journal of Geosciences, 14, 308
Ekwok, S.E., Achadu, O.I.M., Akpan, A.E., Eldosouky, A.M., Ufuafuonye, C.H., Abdelrahman, K., and Gómez-Ortiz, D., (2022). Depth estimation of sedimentary sections and basement rocks in the Bornu basin, northeast Nigeria using high-resolution. Minerals, 12, 285.
Ekwok, S.E., Akpan, A.E., and Kudamnya, E.A., (2019). Exploratory mapping of structures controlling mineralization in Southeast Nigeria using high resolution airborne magnetic data. Journal of Africa Earth Sciences, 162, 103700.
Ekwok, S.E., Eldosouky, A.M.; Ben, U.C., Alzahrani, H., Abdelrahman, K., Achadu, O.I.M., Pham, L.T., Akpan, A.E., and Gómez-Ortiz, D. (2022). Application of high-precision filters on airborne magnetic data: a case study of the Ogoja region, southeast Nigeria. Minerals, 12, 1227.
Ekwueme, B. N., (1994). Structural features of Obudu Plateau, Bamenda Massif, Eastern Nigeria: preliminary interpretation. Journal Mining and Geology 30(1), 45–59
Ekweme, B. N., (1987). Structural orientation and precambrian deformational episode of Uwet area, Oban Massif, S. E. Nigeria. Precambrian Research, 34, 269–289
Eldosouky, A.M., Pham, L.T., and Henaish, (2022). A High precision structural mapping using edge filters of potential field and remote sensing data: A case study from Wadi Umm Ghalqa area, south eastern desert, Egypt. Egyptian Journal of Remote Sensing and Space Science, 25, 501–513
Grant, N. K., (1978). Structural distinction between metasedimentary cover and underlying basement in 600 M.Y. old Pan-African domain. Geology Society of America Bulletin. 89, 50-58.
Grauch, V.J.S, (1987). A new variable-magnetization terrain correction method for aeromagnetic data. Geophysics 52, 94–107.
Gupta, V.K., (1983). A Least Squares Approach to Depth Determination from Gravity Data. Geophysics 48: 357-360.
Mccurry, P., (1971). Pan-African Orogeny in Northern Nigeria. Geology Society of America Bulletin, 82, 3251–3262.
Mccurry, P., (1971). Plate tectonics and the Pan-African orogeny in Nigeria. Nature 229, 154-155
Murthy, I.V.R., and Krisshnamacharyulu, S.K.G., (1990). A Fortran 77 Programme to fit a polynomial of any order to potential field anomalies. Journal of Association of Exploration Geophysicists 11: 99-105.
Nganje, T.N., Hursthouse, A.S., Edet, A. Stirling, D. & Adamu, C. I., (2017). Hydrochemistry of surface water and groundwater in the shale bedrock, Cross River Basin and Niger Delta Region, Nigeria. Appl Water Sci 7, 961–985. https://doi.org/10.1007/s13201-015-0308-9
Nguimbous-Kouoh, J.J., Ngos, I.I.S., Mbarga, T.N., and Manguelle-Dicoum. E., (2017). Use of the polynomial separation and the gravity spectral analysis to estimate the depth of the northern Logone Birni sedimentary basin, Cameroon. International Journal of Geosciences 8: 14–42.
Nguimbous-Kouoh, J.J., (2010). Structure gravimétrique du basin sédimentaire de Goulfey-Tourba Tchad-Cameroun. Thèse de Doctorat/PhD de l’Université de Yaoundé I, Yaoundé, 100 p.
Oha, I.A., Onuoha, K.M., Nwegbu, A.N. and Abba, A.U., (2016). Interpretation of high resolution aeromagnetic data over southern Benue Trough, southeastern Nigeria. Journal of Earth System Science, 125, 369–385.
Pal, S.K., and Majumdar, T.J., (2015). Geological appraisal over the Singhbhum-Orissa craton, India using GOCE, EIGEN6-C2 and in situ gravity data. International Journal of Applied Earth Observation and Geoinformation, 11, 155–166
Rahaman, M. A., (1976). Progressive polyphase metamorphism in pelitic schists around Aiyetoro, Oyo state, Nigeria. Journal of Mining and Geology, 13, 33–44.
Reeves, C., Reford, S., and Millingan, P., (1997). Airborne geophysics: old methods, new images. In: Gubins, A. (Ed.). In the Proceedings of the Fourth Decennial International Conference on Mineral Exploration, Australia, pp. 13–30
Setyawan A., Yudianto H., Nishijima J. and Hakim S., (2015). Horizontal gradient analysis for gravity and magnetic data beneath Gedongsongo geothermal manifestations, Ungaran, Indonesia. In the Proceedings of the 2015 World Geothermal Congress, Melbourne, Australia, pp. 19–25
Schull, T.J., (1988). Rift basins of interior Sudan: Petroleum exploration and discovery. Bulletin of American Association of Petroleum Geologists, 72, 1128–1142.
Schuster, M., Duringer, P., Ghienne, J.F., Vignaud, P., Mackaye, H.T., Beauvilain, A., and Brunet, M., (2003). Discovery of coastal conglomerates around the Hadjer el Khamis Inselbergs, Western Chad, Central Africa: A new evidence for lake Mega-Chad episodes. Earth Surface Processes and Landforms, 28, 1059–1069.
Schuster, M., Roquin, C., Duringer, P., Brunet, M., Caugy, M., Fontugne, M., Macaye, H.T., Vignaud, P. and Ghienne, J.F., (2005). Holocene Lake Mega-Chad Palaeoshore lines from Space. Quaternary Science Reviews, 24, 1821-1827 https://doi.org/10.1016/j.quascirev.2005.02.001.