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385831

GEOPHYSICAL STUDIES USING GAMMA-RAY SPECTROMETRIC AND SELF-POTENIAL TECHNIQUES OF MAKHRAG EL-EBEL AREA, SOUTH GABAL MONQUL, NORTH EASTERN DESERT, EGYPT

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Last updated: 21 Dec 2024

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Abstract

Gamma-ray spectrometric and self-potential (SP) surveys were carried out to determine the radioactive anomalous zones and to follow their extensions at Makhrag El-Ebel area, south Gabal Monqul, Northeastern Desert. The study area and its surroundings is built up of igneous and metamorphic rocks of late Precambrian age. The basement rocks of Makhrag El Ebel area are part of the Pan African belt. They comprise Dokhan volcanics which are distinguished into basic and acidic volcanic, younger granite, dolerite dykes, quartz and barite veins. These rocks are traversed by dry wadies.
The ground gamma-ray spectrometric data have been analyzed qualitatively and quantitatively by applying specific interpretation techniques. These data revealed that, the study area shows relatively wide range of concentrations, oscillating from 3.25 to 67.3 Ur, 1.72 to 52.8 ppm, 2.04 to 64.2 ppm and from 0.83 to 6.3 %, for the total count (T.C.), equivalent uranium (eU), equivalent thorium (eTh) and potassium (K), respectively. The uranium composite image showed that, the highly radioactive parts are mainly associated with the younger granite rocks. Also, the interpreted radiometric lithologic unit map reflects a distinct content of radioelements for each of the interpreted radiometric lithologic (IRL) units, and probably, common features that could be found in the lithologic composition for each unit.
The SP data of the surveyed area exhibit moderate to very high anomalies, with amplitudes vary from -147.2 to +123.2 mV. The very high anomalies (relatively high negative amplitudes -44.2 to -147.2) are associated with strong surface mineralization or shallow ore bodies, these anomalies zones associated with younger granite which has fracture fillings with copper (Cu) and barite mineralization and a basic dyke which is located in the centeral southern part of the selected area as confirmed from the field observations. The moderate anomalies (relatively moderate negative amplitudes -8.4 to -44 mV), which located in the northern part of mapped area, can be related to ground water and wadi sediments, as confirmed from the field observations. The parameters of the source causative bodies, such as the locations, depth, polarization angle and electric dipole momentum were estimated for six SP anomaly lines (profiles), representing six anomalies. A fair agreement was found among the radiometric and SP anomalies at some places of the study area. This may indicate that the surface radiometric mineralization continued to deeper
depths at these parts.

DOI

10.21608/jegs.2021.385831

Authors

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H.F.

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HAMMAM

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(1) Nuclear Materials Authority

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First Name

S.A.

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MOUSA

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(2) Ain Shams University, Egypt

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First Name

S.H.

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ABD EL-NABY

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(2) Ain Shams University, Egypt

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A.A.

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HASSAN

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(1) Nuclear Materials Authority

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R.M.

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ABDEL-RAHEIM

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(1) Nuclear Materials Authority

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Volume

19

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1

Related Issue

50967

Issue Date

2021-12-01

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2024-10-12

Publish Date

2021-12-01

Page Start

37

Page End

47

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1687-2207

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https://jegs.journals.ekb.eg/article_385831.html

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https://jegs.journals.ekb.eg/service?article_code=385831

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385,831

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Original Article

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3,051

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Journal

Publication Title

Journal of Egyptian Geophysical Society

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https://jegs.journals.ekb.eg/

MainTitle

GEOPHYSICAL STUDIES USING GAMMA-RAY SPECTROMETRIC AND SELF-POTENIAL TECHNIQUES OF MAKHRAG EL-EBEL AREA, SOUTH GABAL MONQUL, NORTH EASTERN DESERT, EGYPT

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Article

Created At

21 Dec 2024