A geophysical correlation between near-surface radioactivity and subsurface faults detected by gravity method for a region located in the western desert of Iraq

Subject Areas : Mineralogy

Wadhah Mahmood Shakir AL-Khafaji ¹ , Hayder Abdul Zahra Al-Dabbagh ²

1 - University of Baghdad, College of Science for Women, Department of Physics, Iraq
2 - Ministry of Science and Technology, Department of Geophysics, Iraq

Received: 2018-04-28 Accepted : 2018-12-27 Published : 2019-04-01

Keywords: Faulting Radioactivity, Faulting Gravimetry, W- Desert Iraq,

Abstract :

This research study deals with the processing and interpretation of the total Bouguer anomaly and the total count iso-radiation data for a region located in the western desert of Iraq. The research aims to delineate the approximate locations and the effective depth of faults and how does rocks radioactivity act nearby the faults. The graphical method adopted to separate the residual fields from regional’s, in order to be processed later by applying the horizontal gradient filter. The results displayed as maps and profile section which delineate qualitatively the approximate locations of faults and quantitatively the high radio counts and major faults effective depth within the region. The results of this study showed that the major faults within the region extend with the directions NW-SE, with effective fault depth ranges of 1.7 – 4.9 Km. High radiometric anomalies detected near or between fault locations as they detected after conducting a gravity-radiometric profile section across the region. Peaks of high radiation total counts are located over the elevated blocks which produced by faulting action. The detected faults penetrate the main groundwater aquifer in the region and this considered responsible for transporting radioactive elements to the surface over and nearby the detected fault locations to form spots of accumulated radioactive deposits.

References:

1. AL Sanawi S (1982) Introduction to Applied Geophysics, 1^st Ed., Printed by the University of Baghdad- Iraq, 144 pages.


2. Al-Atia M, Mahdi M (2005) Origin and Mode of Formation of Abu Skhair uranium deposits, middle Iraq, Iraqi Bulletin of  Geological Mining 1:15-27 (in Arabic).


3. Al-Bassam KS, Beni TJ, Ameen GF, Al-Basrawi NH, Raheem AS (2013) Environmental Geochemical and Radiometric Survey in the Vicinity of Abu Skhair Uranium Mine, Najaf, Iraq, Iraqi Bulletin Of Geology and Mining 9:131-149.


4. Al-Dabbagh HA (2005) Qualitative Interpretation of Regional Radiometric Airborne Survey for Gaara- Higher Euphrates Region (West of Iraq), Ph.D. Dissertation, University of Baghdad, College of Science, Department of Geology, 142 pp.


5. AL-Kadhimi JAM, Fattah AS (1994) Bouguer Anomalies map of Iraq, published by Iraqi GEOSURV, Baghdad /Iraq. 


6. AL-Khafaji WMS (2014) A Geophysical Study to Evaluate the Groundwater Reserve and Structural Situation of South Sinjar Anticline Region NW-Iraq, Ph.D. Dissertation, University of Baghdad, College of Science, Department of Geology, 171 pages.


7. AL-Khafaji WMS (2016) Gravity field interpretation for subsurface faults detection in a region located SW-Iraq, Iraqi Journal of Science 57:2270-2279.


8. AL-Khafaji WMS (2017) Gravity Field Interpretation for Major Fault Depth Detection in a Region Located SW- Qa’im / Iraq, Baghdad Science Journal 14:625-636. 


9. Al-Marsoumi AH (1982) Geochemical Detection of radioactive Materials Accumulation at Heet- shithatha region, Ph.D. Dissertation, University of Baghdad, College of Science, (unpublished).


10. Al-Nahab M, Hanafi A (1978) a Ground spectrometric survey at Shithatha, State Department of Geological Survey and Mining, Laboratory Report No. 929, 21 pages.


11. Araim HI, Al-Wasity JA, Al-Ani SS (1990) Hydrogeological Map of Iraq, scale 1:1000000, published and printed by S.E. of Geological Survey and Mineral Investigation, Baghdad-Iraq.


12. Biswas A (2015) Interpretation of residual gravity anomaly caused by simple shaped Bodies using very fast simulated annealing global optimization, Geoscience Frontiers 6: 875–893.


13. Dobrin MB (1976) Introduction to Geophysical Prospecting, Mc Graw Hill Inc.,747 pages.


14. Jassim SZ, Hagobian DH, Al-Hashimi HA (1990) Geological Map of Iraq, scale 1:1000000, Iraqi GEOSURV, Baghdad-Iraq.


15. Jassim SZ, Goff JC (2006) Geology of Iraq, Dolin, Prague and Monrovian museum, Brno.341pages.


16. Levinson A (1980) Introduction to Geochemical Exploration, 3^rd edit., Applied Publishing Ltd., Calgary, 12 pp.


17. Mahdi M, Al-Tamimi M (2009) Preliminary evaluation of the uranium contaminant level in the groundwater of the Iraqi Southern and Western Deserts, Iraqi Bulletin Of Geology and Mining 5:21-28, (in Arabic).


18. Onur T, Gok R, Abdulnaby W, Shakir AM, Mahdi H, Numan NMS, Al-Shukri H, Ghlaib HK, Ameen TH, Abd NA (2016) Probabilistic seismic hazard assessment for Iraq, LLNL Technical report, 20 pp.


19. Parasnis DS (1971) Physical Property Guide for Rocks and Minerals, ABEM, Stockholm. Geophysics Memorandum 4171, 12 pp.


20. Parasnis DS (1982) Principles of Applied Geophysics, 3^rd Ed., published in the USA by Chapman and Hall, 275 pp.


21. Sharma PV (1986) A Geophysical Methods in Geology, 2nd Ed., Elsevier Science Publishing Company Incorporation, 442 pages.


22. Sissakian VK, Al-Kadhimi JAM, Diekman DB, Fattah AS (1996) Tectonic map of Iraq, scale 1:1000000, sheet No.2, 2^nd Ed., National Library Legal Deposit No.10, Baghdad-Iraq.


23. Telford WM, Geldart LP, Sheriff RE, Keys RE (1976) Applied Geophysics, Cambridge University Press.


24. Toushmalani R (2010) Application of Gravity Method in Fault Path Detection, Australian, Journal of Basic and Applied Sciences 4: 6450-6460.