Aeromagnetic Anomalies and Tectonic Trends in and Around the Southern Part of Sokoto Basin, NW, Nigeria, using the Enhancement Filtering Techniques
DOI:
https://doi.org/10.56532/mjsat.v4i3.261Keywords:
Aeromagnetic anomalies, Tectonic trends, Digital filtering tools, Metalliferous minerals, Sokoto BasinAbstract
The Taloka formation Sokoto Basin, Nigeria, was studied in an effort to discover and map the structural features favourable for metalliferous mineral deposits. High-resolution aeromagnetic data was subjected to structural analysis in order to map and highlight structural lineaments and their trends, as well as the depth of magnetic source bodies. Several digital filtering approaches were used to analyze, process, and interpret the data, including total gradient, total horizontal derivative of tilt of angle derivative (THDR_TDR), source parameter imaging (SPI), and spectral depth analysis. The RTE method was employed to prevent the North-South signal from predominating the results because the area was within the low latitude zones. The eastern Gundumi formation (Marafaro, Rujin Tsamia, Kwanawa, Dande, and Rikaka), the northeastern Taloka formation (Dutsen Bature, Bange, and Kumazo), and the western Taloka formation (Bejiji, Bagu, Danjiru, Baranzaki, and Awakala) are all found to have low amplitude magnetic anomalies. The research area exhibits magnetic anomalies with strong amplitudes (0.078 nT/m), which are consistent with the total gradient (AS) approach and might be caused by ferromagnetic minerals like iron stone. The aforementioned filters were also used to outline the lineaments (such as faults, fractures, or shear zones) believed to be associated with alteration zones, which are essential in locating the mineralized zones. The lineaments typically trend in the E-W, NW-SE, and NE-SW directions. Utilizing the SPI techniques, the depth of occurrence of the causative bodies was found to be below 250.3 m. The crustal magnetic field values were utilized to generate the two-dimensional Fourier transforms, from which the radial spectrum was recovered. The depth values were calculated using the slopes of the sixteen sections' spectrum energy against frequency graph. According to the findings, the study area's deeper depth lies between 1.10 and 1.69 km, while its shallower depth lies between 0.39 and 0.90 km. The study finds that alteration zones may harbour minerals and that the thickness of the sedimentary layer may not be sufficiently buoyant to support the build-up of hydrocarbons but will enhance the possibility of other mineralization.
References
C. A. Kogbe, “Geology of southeastern portion of the Iullemmeden Basin (Sokoto Basin)”, Bull. Dept. Geology, Ahmadu Bello University, Zaria, Nigeria. Vol.2, pp. 42-64, 1979.
N. G. Obaje, “Geology and Mineral Resources of Nigeria” [Online]. Available from: http://www.springerlink.com/index/10.1007/978-3-540-92685-6. 2009.
P. Kearey, M. Brooks, and I, Hill. “An Introduction to Geophysical Exploration”, 3rd edn, Oxford: Blackwell Publishing, USA: Iowa state university press.
GETECH “Advanced Processing and Interpretation of Gravity and Magnetic Data, UK., 2007.
A. Adamu, O. K. Likkason, A. S. Maigari, S. Ali, and E. A. Agada, “Subsurface Investigation of Geological Structures from Magnetic Method in Parts of Kangiwa Gwandu Formation, NW Nigeria”, Six International Conference on Engineering Geophysics, (ICEG) Virtual, 25-28 October, 2021, United Arab Emirate University, Al-Ain, Abu-Dhabi, DOI: 10.1190/iceg2021-085.1. Pp. 336-341.
W. Lowrie, “Fundamentals of Geophysics” (Second ed.). Newyork: Cambridge University Press. www.cambridge.org/isbn/9780521859028. pp.43–73, 2007.
C. A. Kogbe, “Cretaceous and Tertiary of the Iullemmeden Basin in Nigeria (West Africa)”, Cretaceous Research Vol. 2, pp. 129 – 186, 1981.
J. D. Fairhead, “Advances in Gravity and Magnetic Processing and Interpretation”, (EAGE Publications), 2015.
O. K.. Likkason, G. P. Singh, and N. K. Samaila, “A study of the Middle Benue Trough (Nigeria). Based on Geological Application and Analysis of Spectra of Aeromagnetic Data-in Energy sources part, Recovery Utiliztion and Environmental Effects”, Doi: 10.1080/15567036.2010.514588, 2013.
W. M. Telford, L. P. Geldert, R. E. Sheriff, D. A. Keys, “Applied Geophysics, Cambridge University Press, Cambridge, London, Sydney, Pp. 323-342, 1976.
O. K. Likkason, “Exploring and Using the Magnetic Methods – in Advanced Geosciences and Remote Sensing”, Intechopen, https://dx.doi.org/10.5772/57163. 2014.
W. J. Hinze, R. R. B. Von Frese, and A. H. Saad, “Gravity and magnetic exploration: Principles, practices, and applications”, 2010.
R. J. Blakely, “Potential Theory in Gravity and Magnetic Applications”, Cambridge University Press, Cambridge, UK., pp.461, 1996.
Geosoft Inc. “Defining and applying filters and inverse FFT in MAGMAP”. Www.Geosoft.Com., pp.1–27, 2015.
M. N. Nabighian, “The Analytic Signal of Two-Dimentional Magnetic Bodies with Polygonal Cross-section: Its Properties and Use for automated Anomaly Interpretation. Geophysics. Vol. 37, 1972.
M. Mushayandebvu, P. van Drielz, A. Reid, and J. Fairhead. “Magnetic source parameters of two-dimensional structures using extended Euler deconvolution”, Geophysics, Vol. 66, 814-823, 2001.
P. S. Naidu, and M. P. Mathew, “Digital analysis of aeromagnetic maps: detection of a fault”, J. Applied Geophysics Vol. 38, pp. 169-179, 1998.
G. K. Anudu, R. A. Stephenson, and D. I. M. Macdonald, “Using high-resolution aeromagnetic data to recognise and map intra-sedimentary volcanic rocks and geological structures across the Cretaceous middle Benue Trough, Nigeria. Journal of African Earth Sciences. Vol. 99, pp.625–636, 2014.
I N. MacLeod, K. Jones, and T. F. Dai, “3-D analytic signal in the interpretation of total magnetic field data at low magnetic latitudes”, Exploration Geophysics. Vol. 24, pp. 679– 688, 1993.
W. R. Roest, and M. Pilkington, “Identifying remanent magnetization effects in magnetic data”, Geophysics. Vol. 58, pp.653–659, 1991.
J. D. Fairhead, and C. S. Okereke, “A regional gravity study of the West African rift system in Nigeria and Cameroon and its tectonic interpretation”, Tectonophysics, Vol. 143, pp. 141–159, 1988.
J. D. Fairhead, A. Salem, L. Cascone, M. Hammill, S. Masterton, and E. Samson, “New developments of the magnetic tilt-depth method to improve structural mapping of sedimentary basins”, Geophysical Prospecting. Vol. 59, pp.1072–1086, 2011.
Geosoft Program (Oasis Montaj), “Geosoft Mapping and Application System Inc”, Suit 500, Richmond St. West Toronto, ON Canada N5SIV6, 2007.
A. Salem, S. Williams, J. D. Fairhead, D. Ravat, R. Smith, “Tilt-depth method: A simple depth estimation method using first-order magnetic derivatives”, The Leading Edge, Vol. 26, pp. 1502–1505. https://doi.org/10.1190/1.2821934. 2007.
S. A. Saada, “Edge Detectionand Depth Estimation from Magnetic Data of Wadi Arab, Eastern Desert-Egypt”, IOSR Journal of Applied Geology and Geophysics Vol.3, pp.2321–990, 2015.
J. B. Thurston, and R. S. Smith, “Automatic conversion of magnetic data to depth, dip, and susceptibility contrast using the SPI (TM) method”, Geophysics. Vol. 62, pp. 807, 1997.
A. Salem, R. Blakely, C. Green, D. Fairhead, and D. Ravat, “Estimation of depth to top of magnetic sources using the local-wavenumber approach in an area of shallow Moho and Curie depth — The Red Sea. Interpretation”. Vol. 2, pp.1–8. 2014.
Y. Li, Y. Yang, and T. Liu, “Derivative-based techniques for geological contact mapping from gravity data”. Journal of Earth Science. Vol. 21, pp. 358–364, 2010.
O. B. Nwosu, “Determination of Magnetic Basement Depth Over Parts of Middle Benue Trough By Source Parameter Imaging (SPI) Technique Using HRAM,” Vol. 3, pp. 262–271, March, 2014.
A. Spector, and F. S. Grant, “Statistical models for interpreting aeromagnetic data,” Geophysics. Vol, pp.293–302, June, 1970.
R. T. Shuey, D. K. Schellinger, A. C. Tripp, and L. B. Ali, “ Curie depth determination from aeromagnetic spectra,” Geophysical Journal of the Royal Astronomical Society. Vol. 50, pp.75–101. March, 1977.
L. I. Nwankwo, and A. T. Shehu, “Evaluation of Curie-point depths, geothermal gradients and near-surface heat flow from high-resolution aeromagnetic (HRAM) data of the entire Sokoto Basin, Nigeria,” Journal of Volcanology and Geothermal Research vol. 17, pp 45-62, September 2015. doi: 10.1016/j.jvolgeores.
H. Zhang, Y. R. Marangoni, X. Hu, and R. Zuo, “A new reduction to the pole method at low latitudes via a nonlinear thresholding,” Journal of Applied Geophysics. 111, pp.220–227, April 2014.
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