Structures and Depth to Magnetic Source Assessment of Auchi Sheet 266, South-Eastern Nigeria

Main Article Content

Mam D. Tawey
Ibrahim A. Adesoji
Ismail A. Garba

Abstract

The current study was designed to provide a consistent and detailed understanding of the Structural disposition and magnetic source depth of Sheet 266, south-east Nigeria in the Auchi region by applying three source edge mapping techniques: horizontal gradient magnitude; tilt derivative and Euler deconvolution to aeromagnetic data obtained from Nigeria Geological Survey Agency Abuja (NGSA). To achieve the above objective, there was a need to correct the latitudinal effect on data obtained at low latitudes just as the present case, the total magnetic intensity (TMI) data was reduced to the pole (RTP) and regional magnetic anomalies were extracted from the RTP data to obtain the residual anomaly data using the upward continuation technique. To establish the boundaries of the magnetic sources, various source edge mapping techniques such as Analytic signal (AS), Horizontal Gradient Magnitude (HGM) and Tilt Derivative (TDR) were applied. A strong correlation between these techniques has been found, suggesting that their incorporation may contribute to delineating the structural mechanism of the study area. A comprehensive structural map based on the findings was therefore built. The key tectonic patterns in the study region are typically interpreted to predominantly ENE-WSW trend followed by WNW-ESE trend. In the study area, depth to magnetic source estimation using 3D Euler deconvolution and source parameter imaging (SPI) has also shown that the two techniques complement each other with depth estimation and general depth to magnetic source was 50 m in the basement portion of the study area and >2000 m in sedimentary portion as seen from both SPI and 3D Euler deconvolution techniques.

Keywords:
Source edge, auchi, RTP and deconvolution.

Article Details

How to Cite
Tawey, M. D., Adesoji, I. A., & Garba, I. A. (2020). Structures and Depth to Magnetic Source Assessment of Auchi Sheet 266, South-Eastern Nigeria. Asian Journal of Geological Research, 3(4), 1-15. Retrieved from https://journalajoger.com/index.php/AJOGER/article/view/30113
Section
Original Research Article

References

Black R. Precambrian of West Africa. Episodes. 1980;4:3–8.

McCurry P. Pan-African Orogeny in Northern Nigeria. Geol. Soc. Am. Bull. 1971a;82,:3251-3262

Rahaman MA. Progressive polyphase metamorphism in pelitic schists around Aiyetoro, Oyo State, Nigeria. J. Min. Geol. 1976a;13:33- 44

Grant NK. Structural distinction between the metasedimentary cover and underlying basement in 600 M.Y. old Pan-African domain. Geol. Soc. Am. Bull. 1978;89:50-58.

Ekweme BN. Structural orientation and Precambrian deformational episode of Uwet area, Oban Massif, S. E. Nigeria. Precambrian Res. 1987;34:269-289.

Ekwueme BN. Structural features of Obudu Plateau, Bamenda Massif, Eastern Nigeria: Preliminary interpretation. J. Min. Geol. 1994;30(1):45-59.

Olasehinde PI, Awojobi, MO. Geologic and geophysical evidence of a North-South fracture system, East and West of the upper Gurarariver in Central Nigeria. Water Resources Journal. 2004;15(1):33-37

Oluyide PO. Structural trends in the Nigerian basement complex. Precambrian Geology of Nigeria, Geological Survey of Nigeria. 1988;93-98.

Udoh AN. Remote sensing imageries of Nigeria, north of 70401: In: Oluyide, P.O.et. al.,(eds). Precambrian Geology. Geological Survey of Nigeria, Publ. 1988;99-102.

Wright JB. Geology and mineral resources of West Africa. George Allen and Unwin, London. 1985;187.

NGSA. Geology and Structural Lineament Map of Nigeria; 2006.

Okpoli CC, Oludeyi D. Aeromagnetic Mapping of Iwo Region of Southwestern Nigeria of Lithostructural Delineation. Pakistan Journal of Geology. DOI: https://doi.org/10.2478/pjg-2019-0008

Olomo KO, Olayanju GM, Adiat KAN, Akinlalu AA. Integrated Approach Involving Aeromagnetic And Landsat For Delineating Structures And Its Implication On Mineralisation. International Journal of Scientific and Technology Research; 2018. ISSN 2277-8616.

Ayanwola MD, Bamisaiye OA. Geological Mapping of Igbara-Oke and Owena Area South Western, Nigeria. limatol Weather Forecasting. 2018;6:243. DOI:10.4172/2332-2594.1000243

Alabi AA, Olowofela O. Estimation of Source Parameters in Ibadan, South-Western Nigeria Using Digitized Aeromagnetic Data. Journal of Natural Science, Engineering and Technology; 2015. ISSN: Print - 2277 – 0593 Online - 2315 - 7461

Jayeoba A, Odumade D. Geological and Structural Interpretation of Ado-Ekiti Southwest and its Adjoining Areas Using Aeromagnetic Data. Adapted from extended abstract prepared in conjunction with the oral presentation given at Pacific Section AAPG, SEG and SEPM Joint Technical Conference, Oxnard, California; 2015. AAPG

Sunmonu LA, Olasunkanmi NK, Alagbe OA. Aeromagnetic data interpretation for geo-structural analysis of Ibadan, Southwestern Nigeria. International Journal of Engineering Research & Technology (IJERT). 2013;2(10). ISSN: 2278-0181

Storey BC. The role of mantle plumes in continental breakup: a case history from Gondwanaland, Nature. 1995;377:301-308.

Omatsola ME, Adegoke OS. Tectonic evolution and Cretaceous stratigraphy of the Dahomey basin; Journal of Mining and Geology. 1981;18(1):130-137.

Adediran SA, Adegoke OS. Evolution of the sedimentary basins of the Gulf of Guinea- Current Research in Africa Earth Sciences, Matheis and Schandeimeier (eds); Balkema, Rotterdam. 1987;283-286

Coker SJL, Ejedawe JE. Petroleum prospects of the Benin basin, Nigeria, Nig. Jour. of Min. and Geol. 1987;34:424-439.

Whiteman AJ. Nigeria: Its Petroleum Geology, Resources and Potential, vol.1&2, Graham and Trottan, London. 1982;:394.

Rajaram M. What’s new in the interpretation of magnetic data? Geohorizons. 2009;50.

Salem A, Williams S, Fairhead JD, Smith R, Ravat DJ. Interpretation of magnetic data using tilt-angl derivatives. Geophysics. 2008;73: L1–L10.

Verduzco B, Fairhead JD, Green CM, MacKenzie C. The meter reader – new insights into magnetic derivatives for structural mapping. The Leading Edge. 2004;23:116–119.

Miller HG, Singh V. Potential field tilt – A new concept for the location of potential field sources. Journal of Applied Geophysics. 1994;32:213–217.

Roest W, Verhoef J, Pilkington M. Magnetic interpretation using 3-D analytic signal. Geophysics. 1992;57:116-125.

Hogg S. GT-Gradient tensor gridding, geologic structure, example, 2004. Available:http://www.shageophysics.com/

Phillips JD. Locating magnetic contacts; A comparison of the horizontal gradient, Analytic Signal and Local Wavenumber Methods: Society of Exploration Geophysicists, Abstracts with Programs, Calgary. 2000;402–405.

Grauch VSJ, Cordell L. Limitations of determining density or magnetic boundaries from the horizontal gradient of gravity or pseudo gravity data. Short note, Geophysics. 1987;52(1):118–121.

Reid AB, Allsop JM, Granser H, Millet AJ, Somerton IW. Magnetic interpretation in three dimensions using Euler deconvolution. Geophysics. 1990;55:80-91

Thompson DT. EULDPH: a new technique for making computer-assisted depth estimates from magnetic data. Geophysics. 1982;(47):31–37.

Salako KA. Depth to Basement Determination Using Source Parameter Imaging (SPI) of Aeromagnetic Data: An Application to Upper Benue Trough and Borno Basin, Northeast, Nigeria. Academic Research International. 2014;5(3). ISSN: 2223-9944, eISSN: 2223-9553

Thurston JB, Smith RS, Guillon JC. A multi-model method for depth estimation from magnetic data. Geophysics. 200;67(2):555–561

Thurston JB, Smith RS. Automatic conversion of magnetic data to depth, dip, and susceptibility contrast using the SPI method. Geophysics. 1997;62(3):807–813.

Thurston J, Guillon JC, Smith R. Model-independent depth estimation with the SPITM method: 69thAnnual International Meeting, SEG, Expanded Abstracts. 1999;403–406.

Lou Y, Xue D-J, Wang M. Reduction to the pole at the geomagnetic equator. Chinese Journal of Geophysics. 2010;53(6):1082-1089.

Li X. Magnetic reduction-to-the-pole at low latitudes; 2008.

Yaoguo L, Douglas WO. Stable reduction to the pole at the magnetic equator Geophysics. 2001;66(2):571–578.

Milligan PR, Gunn PJ. Enhancement and presentation of airborne geophysical data. AGSO Journal of Australian Geology and Geophysics. 1997;17(2):64–774.

Baranov V. A new method of interpretation of aeromagnetic maps: Pseudogravimetric anomalies. Geophysics. 1957;(22):259-283.

Telford WM, Geldart LP, Sherriff RE, Keys DA. Applied geophysics. Cambridge: Cambridge University Press. 1990;860.

Reynolds JM. An introduction to applied and environmental geophysics, John Wiley and Ltd. Bans Lane, Chichester. 1997;124-13.

Blakely RJ. Potential theory in gravity & magnetic applications, Cambridge University Press, Cambridge. 1995;1–437.

Phillips JD. Processing and Interpretation of Aeromagnetic Data for the Santa Cruz Basin – Patahonia Mountains Area, South-Central Arizona. US. Geological Survey Open-File Report, Arizona. 1998;02-98.

Salem A, Williams S, Fairhead JD, Smith R, Ravat DJ. Interpretation of magnetic data using tilt-angle derivatives. Geophysics. 2008;73:L1–L10.

Stavrev P, Reid A. Degrees of homogeneity of potential fields and structural indices of Euler deconvolution. Geophysics. 2007;72:L1-L12

Smith RS, Thurston JB, Dai TF, MacLeod. IN iSPI —- the improved source parameter imaging method: Geophysical Prospecting. 1998;46:141–151.

Tawey MD, Alhassan DU, Adetona AA, Salako KA, Rafiu AA, Udensi EE. Application of aeromagnetic data to assess the structures and solid mineral potentials in part of North Central Nigeria. Journal of Geography, Environment and Earth Science International. 2020;24(5):11-29. Article no.JGEESI.58030 ISSN: 2454-7352