keywords: Power spectral, 2-D modelling, Conrad discontinuity and Moho discontinuity
Determination of the crustal thickness within northern Bida Basin is bounded by latitudes 8o 30ʹ N and 11o 00ʹ N and longitudes 4o 00ʹ E and 7o 00ʹ E is situated in the northern part of the Bida Basin. Empirical relation method, power spectral method and modelling were used to estimate the crustal thickness within the study area using Bouguer Gravity Data. The empirical relation method shows that the average crustal thickness ranges from 33 to 47 km, the results obtained from the power spectral method gives an average crustal thickness ranges between 29 and 47 km. Within the study area, a straight line equation (HC = 39.09 –0.142BG) was derived such that for any given Bouguer anomaly value, the crustal thickness can easily be estimated from the equation. Crustal thickness was obtained by taking an average between the results obtained from the two modelling profile. The results obtained revealed that the crustal thickness within the study area ranges from 39 to 47 km. The average crustal thickness obtained from two model profile fall within the range of average Moho depth of Nigeria (32 to 44 km) and Africa (39 km). The study area is stable tectonically since Nigeria lies within a plate (Africa) and has a considerable Moho depth range.
Donald BH, Douglas PK & David CC 1995. Geophysical methods in exploration and mineral environmental investigations. US Geological Survey, 19 – 27. Retrieved from https://pubs.ugs.gov/of/.../CHAPT3.pdf. Mariita NO 2007. Strenght and weakness of gravity and magnetics as exploration tools for geothermal energy. Geophysics, 2(12): 17-33. Megwara U & Udensi EE 2014. Structural analysis using aeromagnetic data: Case study of parts of southern Bida Basin, Nigeria and the surrounding basement rocks. J. Earth Sci. Res., 3(2): 27-42. Obaje NG, Wehner G, Scheeder G, Abubakar MB & Jauro A 2004. Hydrocarbon prospectivity of Nigeria’s Inland Basins: From the viewpoint of organic geochemistry and organic petrology. Am. Assoc. Petroleum Geologists Bull., 88: 325-353. Ojo SB & Ajakaiye DE 1989. Preliminary interpretation of gravity measurement in the middle Niger Basin area, Nigeria. In: C.A. Kogbe (Eds) Geology of Nigeria, 2nd Edition, Elizabeth Publishing Company, Lagos, pp. 347-358. Ojo OJ 2012. Sedimentary facies relationships and depositional environments of the Maastrichtian Enagi Formation, Northern Bida Basin, Nigeria. Journal of Geography and Geology, 4: 1-4. Rivero L, Pinto V & Casas A 2002. Moho depth structure of the eastern part of the Pyrenean Belt Derived from gravity data. J. Geodynamics, 33: 315–332. Sedimentary Geology, 12: 1-24. Saada DU, Erdtmann BD & Scheeder G 2013. Structural analysis using aeromagnetic data over Bida Basin, Nigeria and the surrounding basement rocks. J. Earth Sci. Res., 4(3), 27-42. Tealeb KB & Riad FN 1986. Geophysical methods in exploration and mineral environmental investigations. US Geological Survey, 21 – 27. Retrieved from https://pubs.ugs.gov/of/ Udensi EE 2000. Estimation of crustal thickness of Minna: Preliminary investigation. J. Sci., Techn. & Maths. Edu. (JOSTMED), 3(1): 10-17. Udensi EE & Osazuwa IB 2003. Spectral determination of the depths to the buried magnetic rocks under the Nupe Basin. Nig. J. Phys. (NJP), 15(1): 51 – 59.