Main Article Content
Natural gamma-ray spectrometry data of Sheet 145 of the Nigeria Geological map series in Basement rock of North Central Nigeria were used in this work to map-out radioelement distribution, delineate hydrothermal alteration zones and identify hosting rocks for the radioelement. Radioelement maps, ratio maps, and ternary maps were produced superimposed on the geology map of the study area using Oasis Montaj and ArcGIS software. The spatial distribution and occurrence of Potassium (K), Thorium (Th) and Uranium (U), were determined using the radioelement maps of Potassium (K in %), equivalent Thorium (eTh in ppm) and equivalent Uranium (eU in ppm). The hydrothermal alteration zones were delineated using the percentage potassium (% K) - equivalent Thorium (eTh) ratio (K/eTh) map. Zones of high concentrations on the map was delineated as the alterration zones. The ternary map for (K, eTh and eU) were generated to delineate areas of different radioelement concentration. Different colors on the ternary map correspond closely with different rock types when compared with the geological map.
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Abd El Nabi, S.H (2013). Role of γ-ray spectrometry in detecting potassic alteration associated with Um Ba’anib granitic gneiss and metasediments, G. Meatiq area, Central Eastern Desert, Egypt. Arab. J. Geosci. 6, 1249–1261.
Airo, M. (2005). Regional interpretation of aero geophysical data: extracting compositional and structural features. Geological Survey of Finland, Special Paper, 39, 176–197.
Billings, S., Minty, B.R., Newsam, G.N., (2003). Deconvolution and spatial resolution of airborne gamma-ray surveys. Geophysics 68, 1257-1266.
Darnley, A. G., and Ford, K.L(1989). Regional airborne gamma-ray survey: A review; in “Proceedings of Exploration 87: Third Decennial International Conference on Geophysical and Geochemical Exploration for Minerals and Ground Water”, Geological. Survey. Of Canada, Special, pp. 960.
Dickson B.L and Scott K.M (1997). Interpretation of aerial gamma-ray surveys-adding the geochemical factors. AGSO Journal of Australian Geology and Geophysics.17(2):187–200.
Grasty, R.L., Shives, R.B.K., (1997). Applications of gamma ray spectrometry to mineral exploration and geological mapping, Workshop presented at Exploration 97: Fourth Decennial Conference on Mineral Exploration.
Hoover D.B and Pierce A.A (1990). Annotated bibliography of gamma-ray methods applied to gold exploration; U.S. Geol. Surv. Open File. 90-203.
Kearey P, Brooks M, Hill I (2002). An introduction to geophysical Exploration third Edition. TJ international. pp. 2-160
Milson, J.(1989). Field geophysics open university press, Milton Keynes.
Minty, B.R.S (1997). Fundamentals of airborne gamma-ray spectrometry AGSO Journal of Australian Geology and Geophysics, 17(2), 39-50
Portnov A.M (1987). Specialization of rocks towards potassium and thorium in relation to mineralization; International Geology Review. 29:326-344.
Shives, R.B.K.; Charbonneau, B.W. Ford, K.L (2000).The detection of potassic alteration by gamma-ray spectrometry—recognition of alteration related to mineralization. Geophysics. 65, 2001–2011.
Silva A.M, McCafferty A.E, Pires A.C.B (1999). A new approach to map host rock for gold exploration in the Rio Das Velhas Greenstone Belt, Quadrilátero Ferrífero, Minas Gerais, Brazil. Proceedings of the 6th International Congress of the Brazilian Geophysical Society, CD.
Tawey M.D, Adetona A.A, Alhassan U.D, Rafiu A.A, SalakoK.A and Udensi E.E (2021). Aeroradiometric Data Assessment of Hydrothermal Alteration Zones in Parts of North Central Nigeria. Asian Journal of Geological Research, AJOGER, 4(2): 1-16
Urquhart, W.E.S, (1988). Airborne gamma-ray spectrometry surveys, Paper presented at the 55th Annual Meeting of SEG, Anaheim, October, 1988
Wilford JR (1995). Airborne gamma-ray spectrometry as a tool for assessing relative landscape activity and weathering development of regolith, including soils. AGSO Research Newsletter 22, 12-14.