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Integration of in situ measurement of radiometric signatures and aeroradiometric data in geologic mapping of parts of southern Benue Trough and Anambra Basin

  • Martina Onyinye EzeEmail author
  • L. I. Mamah
  • A. I. Oha
Original Paper
  • 38 Downloads

Abstract

Based on the color differences due to radioelement variations of the formations/rocks within the study area, five lithologic units were delineated using the ternary image technique. The units are named classes 1, 2, 3, 4, and 5. The radiometric signature of some of the outstanding anomalies interpreted using Airborne radiometric data in parts of the southern Benue Trough and Anambra Basin was measured at 15 locations in situ. Each value in this report represents an average of multiple readings in the field. The igneous rocks are in the form of cobbles, boulders, diorite, and granodiorite that follow the normal trend for radioelement content that is increased in radioelement content with increasing silica (sio2) content; the biotite-rich granitic rock in the area has a higher radioelement content than other igneous rocks. The granitic rocks at location 10 and 11 and shale at location 14 have the highest radioelements content. The felsic rocks (biotite granite and coarse porphyritic granite) at locations 10 and 11 have higher potassium percentage (1.5% and 3.7%), this is because of the presence of potassium in primary rock forming minerals such as K-feldspars in the rock. There is no trace of potassium mineral concentration on pyroclastic rocks in the area. Abakaliki consolidated shale contains an average value of 2.40% K, 4.80 ppm uranium, and 20.1 ppm thorium. The metamorphic rocks from the area (gneissic rocks) recorded low radioelement values, and this suggests that metamorphism affected the radioelement content.

Keywords

Radiometric In situ Gamma-ray Benue Trough 

References

  1. Allix P, Popoff M (1983) The lower cretaceous of the northeastern parts of the Benue trough (Nigeria) an example of the close relationship between tectonics and sedimentation. Bull. Centres Rech. Explor-Prod. Elf-Aquitaine 7:349–359Google Scholar
  2. Alstair TM, Thomas LH, Paul LY, David CW, Sanderson and Alan JC (2014) Gamma-ray spectrometry in Geothermal exploration: a State-of-Art Techniques. Energies 7:4757–4780CrossRefGoogle Scholar
  3. Amajor LC (1987) Geological appraisal of groundwater exploitations in the eastern Niger Delta. In: Ofoegbu CO (ed) Groundwater and mineral resources of Nigeria. Friedr vieweg and Sohn, Braunschweig/weisbaden, pp 85–100Google Scholar
  4. Benkehelil J (1982) Benue trough and Benue chain. Geol Mag 119:155–168CrossRefGoogle Scholar
  5. Benkehelil J (1986) Structure et evolution geodynamique du basin intracontinental de la Benoue (Nigeria). Unpubli. Thesis, Nice et Elf Nigeria SNEAP (p), v. 2 231pGoogle Scholar
  6. Benkehelil (1989) The origin and evolution of the cretaceous Benue trough (Nigeria). J Afr Earth Sci 8:251–282CrossRefGoogle Scholar
  7. Benkehelil J, Robineau B (1983) Is the Benue trough a rift? Bull Centres Rech Explor-Prod Elf-Aquitaine 7:315–321Google Scholar
  8. Burke KC, Dasauvagie TFI, Whitman AJ (1970) Geologic history of Benue valley and adjacent areas. In: Dasauvagie T.F.I and Whitman, A.J. (eds). Africa Geology. University press, Ibandan, Nigeria. 187–206Google Scholar
  9. Dickson BL, Scott KM (1997) Interpretation of aerial gamma ray surveys adding the geochemical factors. AGSO J Aust Geol Geophys 17:187–200Google Scholar
  10. Dobrin MB, Savit CH (1988) Introduction to geophysical prospecting. Mcgraw-Hill Book CompanyGoogle Scholar
  11. Eze MO, Mamah LI, Onuba L (2017) Geological and structural interpretation of possible mineralization zones of part of Anambra basin and southern Benue trough using airborne geophysical data. Int J Research in Engineering and Applied sciences (IJREAS) issues 5(7):70–80Google Scholar
  12. Fertl (1983) Gamma-ray spectral logging: a new evaluation frontier. World oil:79–91Google Scholar
  13. Fitton JG (1983) Active versus passive continental rifting: evidence from the West Africa rift system. In Mogan, P. And baker, B.H., (Eds.), processes of continental rifting. Tectonophysics 94:473–481CrossRefGoogle Scholar
  14. Fortin R, Hovgaad J, Bates M (2017) Airborne gamma-ray spectrometry in 2017: solid ground for new development. In: “Proceedings of exploration 17: sixth decennial international conference on mineral exploration” edited by V. Tschirhart and M.D. Thomas, vol 2017, pp 129–138Google Scholar
  15. Genik GJ (1992) Regional framework, structural and petroleum aspects of rift basins in Niger, Chad and the Central African Republic (CAR). Tectonophysics 213:169–185CrossRefGoogle Scholar
  16. Grant NK (1971) South Atlantic. Benue Trough and Gulf of Guinea Cretaceous triple junction Bull Geol Soc Am 82:2295–2298Google Scholar
  17. Guiraud M (1990) Tecono-sedimentary framework of the early cretaceous continental Bima formation (upper Benue trough, NE Nigeria). J Afr Earth Sci 10:341–353CrossRefGoogle Scholar
  18. Guiraud M, Binks RM, Fairhead JD, Wilson M (1992) Chronology and geodynamic setting of cretaceous-Cenomanian rifting in west and Central Africa. Tectonophysics 213:227–234CrossRefGoogle Scholar
  19. Gunn PJ (1997) Enhancement and presentation of airborne geophysical data. AGSO J Aust Geol Geophys 17:63–76Google Scholar
  20. Haris JR (1989) Clustering of gamma ray spectrometer data using a computer image analysis system. In Statistical Applications in the Earth sciences, edited by edited by Atterberg and Bonham-Carter, Geological Survey of Canada 89–9Google Scholar
  21. Hongrui Z, Pengfei JIA, Zhang X, Zhigang W (2017) The application of airborne geophysics data for rapid regional geologic mapping in northwestern Angola. Sains Malaysiana 46:2109–2118CrossRefGoogle Scholar
  22. Hoque M (1977) Petrographic differential of tectonically controlled cretaceous sedimentary cycles, southern Nigeria. Jour Sed Geol 17:235–245CrossRefGoogle Scholar
  23. Hoque M, Nwajide CS (1985) Application of Markov chain and entropy analysis to lithologic successions: an example from the cretaceous of the Benue trough (Nigeria). Geol Rundsch 74:165–172CrossRefGoogle Scholar
  24. IAEA (2003) Guidelines for radioelements mapping using gamma ray spectrometry data ISBN 1011–4289Google Scholar
  25. Jaques AL, Wellman P, Whitaker A, Wyborn D (1997) High-resolution geophysics in modern geological mapping. AGSO J Aust Geol Geophys 17(2):159–173Google Scholar
  26. Killeen PG (1979) Gamma ray spectrometric methods in uranium exploration –application and interpretation. In IAEA (2003) Guidelines for radioelements mapping using gamma ray spectrometry data ISBN 1011–4289Google Scholar
  27. Killeen PG, Mwenifumbo CJ, Ford KL (2015) Tools and techniques: radiometric method in G. Scubert, ed Treatise on Geophysics 447–524Google Scholar
  28. Koon RD, Helmke PA, Ml J (1980) Association of trace elements with iron oxides during rock weathering. Soil science society of America, journal 44, 155-159.In Wilford JR Bierwirth PN, Craig MA (1997) application of airborne gamma-ray spectrometry in soil/regolith mapping and applied geomorphology. AGSO J Aust Geol Geophys 17:201–216Google Scholar
  29. Malcolm JP (1981) Tools and Techniques in radiometric exploration. Gech. ETI: How to Build Gold & Treasure Detectors, 1981 Murray/Modern Magazines, reproduce for personal use onlyGoogle Scholar
  30. Mascle J, Marhino M, Wanesson J (1986) The structure of the Guinea continental margin: implication for the connection between the central and the South Atlantic oceans. Geol Rundsch 75:57–70CrossRefGoogle Scholar
  31. Maurin JC, Benkehelil J, Robineau B (1986) Fault rocks of the Kaltungo lineament, northeastern Nigeria and their relationship with Benue trough tectonics. J Geol Soc Lond 143:587–599CrossRefGoogle Scholar
  32. Meyers JB, Worrall L, Lane R, Bell B (2001) Exploring through cover – the integrated interpretation of high resolution aeromagnetic, airborne electromagnetic and ground gravity data from the Grant’s patch area, eastern Goldfields Province, Archaean Yilgarn craton. Part C: combining geophysical methods for a holistic exploration model. Explor Geophys 32:198–202CrossRefGoogle Scholar
  33. Millingan PR, Gunn PJ 1997 Enhancements and presentation of airborne geophysical data. ASGO Journal of Australian Geology and Geophysics, 17 (2):31-38. In Adelene M, Silva Augustoc SP, Anne M, Roberto AV, Hengren, X (2003) Application of airborne geophysical data to mineral exploration in the uneven eexposed terrains of the Rio das Velhas Greenstone Belt. Revista Brasileira de Geoei ncias, 33Google Scholar
  34. Murat RC (1972) Stratigraphy and Paleography of the Cretaceous lower Tertiary in southern Nigeria. In: Dessauvagie TFJ, Whiteman A (eds) African Geology. UI Press, Ibandan, pp 635–641Google Scholar
  35. Nwachukwu CO (1972) The tectonic evolution of the southern portion of the Benue trough. Geol Mag 9:411–449CrossRefGoogle Scholar
  36. Nwajide CS (2013) Geology of Nigeria’s sedimentary basins. CSS Bookshops limited Lagos NigeriaGoogle Scholar
  37. Ofoegbu CO (1985) Interpretation of aeromagnetic anomalies profile across the Benue trough of Nigeria. J Afr Earth Sci 3:293–296Google Scholar
  38. Okengwu KO, Onwualu-John JN (2016) Petrography and major element geochemistry of Pyroclastics in Afikpo: tectonic implications. Journal of Environmental Science, Toxicology and Food Technology (IOSR-JESTFT) e-ISSN: 2319–2402, p-ISSN: 2319–2399.10, Issue 8 Ver. I 49–52Google Scholar
  39. Olade MA (1975) Evolution of Nigeria’s Benue trough (Aulacogen); a tectonic model. Geol Mag 122:575–583CrossRefGoogle Scholar
  40. Olade MA (1976) On the genesis of lead/zinc deposits in Nigeria’s Benue rift (Aulacogen): a reinterpretation. J Min Geol 13:120–127Google Scholar
  41. Oshin IO, Rahaman MA (1986) Uranium favourability study in Nigeria. J. Of Afri. Earth Sci., 5 2: 167-175. In Oguleye PO, Okujeni (1993) the geology and geochemistry of zona uranium occurrence, upper Benue trough; NE Nigeria. J. Mining and geology 40: 2Google Scholar
  42. Petters SW (1978) Maastrichian–Paleocene foraminifera from NW Nigeria and their paleogeography. Acta Paleontol Pol 23:131–150Google Scholar
  43. Reeves C (2005) Aeromagnetic surveys; principles, practice and interpretation Geosoft. Farrington. J. L (1952). A preliminary description of the Nigerian Lead-zinc field. Econ Geol 47:483–608Google Scholar
  44. Shives RB, Charbonneau B, Ford KL (1997) The detection of potassic alteration by gamma-ray spectrometry-recognition of alteration related to mineralization. In: Gunins AG (ed) Proceedings of exploration 97: Fourth Decennial International conference on ineral exploration, p 741–752Google Scholar
  45. Silva AM, Augustoc SP, Anne M, Roberto AV, Hengren X (2003) Application of airborne geophysical data to mineral exploration in the uneven exposed terrains of the Rio das Velhas Greenstone Belt. Rev Bras Geoei ncias 33Google Scholar
  46. Wilford JR, Bierwirth PN, Craig MA (1997) Application of airborne gamma-ray spectrometry in soil/regolith mapping and applied geomorphology. AGSO J Aust Geol Geophys 17:201–216Google Scholar

Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.University of Agriculture UmudikeUmuahiaNigeria
  2. 2.University of NigeriaNsukkaNigeria

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