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Interpretation of Airborne Radiometric and Magnetic Data in the Wadi Millaha Area, North Eastern Desert, Egypt.

Magdy L Meleik

Abstract


Wadi Millaha area is located in the North Eastern Desert of Egypt. It has been systematically surveyed using airborne
gamma-ray spectrometric and magnetic methods. In the present study, the identification of both uranium and thorium
anomalies has been mainly based on examining a set of composite spectrometric profiles over eight radiometric anomalies.
The studies revealed the presence of two high radiometric anomalies while the rest are moderate to weak ones. The fault
systems in the area under study play an important role in the distribution of most of the identified radioactive anomalies.
Two sets oriented ENE to NE and NNW proved to have a significant effect on of the majority of these radiometric anomalies.
The structural interpretation of aeromagnetic data of the area under consideration was delineated. Moreover the qualitative
interpretation for the magnetic anomalies about the main structural and lithologic manifestation is accomplished. Filtering
of the anomalies was done to assist in discriminating shallow and deep ones. Application of trend analysis for aeromagnetic
and aeroradiometric data could show the dominant subsurface structures in the N-S trend, while that of the surfaces is in
the NW-SE trend.
La region de Wadi Millaha est situee dans Ie Desert du Nord Est de l'Egypte. Cette region a ete systematiquement enquetee
en utilisant les methodes magnetiques et spectrometriques des rayons gamma provenant de l'air. Dans la presente etude,
l'identification des anomalies de l'uranium et du thorium a ete principalement basee sur l'examen des profiles d'un
nombre des composites spectrometriques de huH anomalies radiometriques. Ces etudes ont revele la presence de deux
grandes anomalies radiometriques alors que les restes ont montre des anomalies all ant du moderee aux plus faible. La
faille des systemes dans 1a region etudiee joue un role important dans la distribution de plus d' anomalies radioactives
identifiees. Deuz jets "ENE" orientes au Nord-Est (NE) et Nord-Nord-Ouest (NNW) ont reve1e avoir un effet significatif
sur la majorite de ces anomalies radiometriques. L'interpretationn structurelle des donnees aeromagnetiques de cette
region en consideration a etc esquissee. En plus, !'interpretation qualitative des anomalies magnetiques du structure
principale et des manifestations lithologiques a etc accomplie. Le triage d'anomalies a ete fait pour aider a selectionner les
anomalies de profounder et celles de surface. L' application des donnees aeromagnetiques et aeroradiometriques pourrait
montrer des structures de sous surface dominant dans la direction Nord-Est (NE) tandis que celles de surface se trouvarient
dans la direction Nord Ouest (NO)-Sud Est (SE).

Mots cles: Rayons gamma, spectrometriques, magnetiques, radiometriques, anomalies, uranium, thorium, donnees
aeromagnetiques, donnees aeroradiometriques, structure de surface, structure de sous surface, Wadi Millaha, Egypte.




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