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Morphology of Parts of the Middle Benue Trough of Nigeria from Spectral Analysis of Aeromagnetic Data (Akiri Sheet 232 and Lafia Sheet 231)
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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[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.
[11] Offodile, M.E. (1984). The Geology and Tectonics of Awe Brine Field.Journal of Earth Sciences.Vol. 2, No 3 pp 189 – 203.
[12] Offodile, M.E. (2012). Searching for Petroleum within the Middle Benue Trough of Nigeria. Paper Presented at PDTF Chair at University of Jos, Nigeria, on the 14th of April, 2012.
[13] Olade, M.A.(1975). Evolution of Nigeria’s Benue Trough (Aulocogen); Atectonic model/ Geol.Mag. 112, pp575-578
[14] Okereke, C.N., Onu, N.N., Ibe, K.K., Selemo, A.O.I., Opara,A.I., Ikoro, D.O., Ibeneme, S.I. &Oha, I.A (2012).Analysis Of Landsat and Aeromagnetic Data For Mapping Of Linear Structures: A Case Study Of Yola Area, Upper Benue Trough, Nigeria.International Journal of Engineering Research Applications, Vol. 2, Issue 3, May-Jun 2012, pp.1968-1977.
[15] Onyedim, G.C, Alagoa, K.D, Adedokun, I.O, Aderogba, A.A, Ovuru, C, (2009).Mapping High- Basement Faults in the Middle Benue Trough, Nigeria from Gravity Inversion Surface.Earth Sciences Research Journal, vol.13 no.2 Bogotá July/Dec. 2009.
[16] Onyewuchi, R. A, Opara, A.I, Ahiarakwem, C.A, Oko, F.U. (2012).Geological Interpretations Inferred from Airborne Magnetic and Landsat Data: Case Study Nkalagu Area, South eastern Nigeria. International Journal of Science and Technology. Volume 2 No.4, April 2012

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