Morphology of Parts of the Middle Benue Trough of Nigeria from Spectral Analysis of Aeromagnetic Data (Akiri Sheet 232 and Lafia Sheet 231)

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Date

2013-11-16

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Department of Geology and Mining, Nasarawa State University Keffi

Abstract

Structural interpretation of aeromagnetic data and Landsat imagery over the Middle Benue Trough was carried out to determine the depth to basement, delineate the basement morphology and relief, and the structural features within the basin. The aeromagnetic and Landsat data were subjected to various image and data enhancement and transformation routines. Results of the study revealed lineaments with trend directions in the N-S, NE-SW, NWSE and E-W directions, with the NE-SW trends been dominant. The depths to basement within the trough were established to be at 1.8, 0.3 and 0.8km, as shown from the spectral analysis plot. The Source Parameter Imaging (SPI) plot generated showed the centralsouth/ eastern portion of the study area as being deeper in contrast to the western-south-west portion. The basement morphology of the trough was interpreted as having parallel sets of micro-basins which could be considered as grabens and horsts in agreement with the general features interpreted by early workers

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Keywords

Morphology, Middle Benue Trough, Spectral Analysis, Source Parameter Imaging.

Citation

[1] Anderson-Mayes, A.(1997). Harnessing Spatial Analysis with GIS to Improve Interpretation Airborne Geophysical Data. Paper Presented at GeoComputation, 26th-29th August 1997. [2] Ajakaiye, D.E. & Ajayi, C.O.(1986). Structures deducted from gravity data in the Middle Benue, Nigeria. Journal of African Earth Sciences, Vol. 5, No. 4, pp 359 – 369. [3] Benkhelil,J.(1987). The evolution of the cretaceous Benue Trough, Nigeria. Journal of African Earth Sciences, Vol.8,251-282.3 [4] Burke,K.C.,Dessaurage, T.F.J.and Whitman, A.J.(,1971).Geological History of the Benue Valley and Adjacent Areas. African Geology,University of Ibadan press, Ibadan. [5] Cratchley, C.B. and Jones, G.P. (1965) .An interpretation of the geology and gravity anomalies of the Benue Valley, Nigeria. Overseas Geological Survey.Geophysics. Paper, No. 1, pp 1 – 26. [6] Geosoft Oasis Montaj, Arc GIS,Suffer8.0; Ilwis, Arcview 9.3. [7] Nigerian Geological Survey Agency (NGSA), 2010. [8] Nur, M.A, Onuoha, K.M, Ofoegbu, C.O (1994). Spectral Analysis of Aeromagnetic Data over the Benue Trough. Journal Mining and Geology, Vol. 30,. 2, pp 211-217. [9] Nwachukwu, S.O.( 1972). The Tectonic Evolution of the Southern portion of the Benue, Nigeria.Geological Magazine, NO.pp411-419. [10] Offodile, M.E. (1976). The Geology of the Middle Benue, Nigeria. Ph.D. Thesis. University of Uppsala, Sweden. 166p.

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https://keffi.nsuk.edu.ng/handle/20.500.14448/5647

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