DETAILED GEOLOGIC AND SPECTRAL RADIOMETRIC STUDIES, NORTH ELEREDIYA GRANITIC PLUTON, CENTRAL EASTERN DESERT, EGYPT | ||
| Journal of Egyptian Geophysical Society | ||
| Volume 6, Issue 1, 2008, Pages 103-113 PDF (2.71 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jegs.2008.380856 | ||
| Author | ||
| H.S.O. Abouelnaga | ||
| Nuclear Materials Authority, P.O. Box 530, El Maadi, Cairo, Egypt. | ||
| Abstract | ||
| Uranium mineralization was discovered in 1970 in Elerediya post-tectonic granitic mass, Central Eastern Desert, Egypt. It is connected with jasperoid veins, which occupy shear and fracture zones. Excavation works revealed the presence of massive and disseminated pitchblende, as well as its secondary associations, in some sections of the explored shear zones. The granite along the shear zone is altered. Most of recent the geophysical studies are restricted to the southern part of Elerediya granitic pluton. Special colours characterize the northern part of Elerediya granitic pluton, where the intense hematitization gives the rock reddish colouration, and limonite with sericite and clay minerals produce the yellowish orange tones. The present study is considered the first extensive gamma ray spectrometric survey carried out in the northern part of Elerediya pluton, besides the detailed geologic mapping on grid survey lines. Spectrometric data were statistically treated in order to evaluate the uranium potentiality and its controlled trend. The study shows that there is a close relationship between the distribution of radioelements and the lithology. It also shows that eTh contents are higher than eU contents in nearly most lithologic units of the study area. The maximum readings reach 280 Ur, 6.5 %, 55ppm and 156 ppm for Tc, K, eU and eTh respectively. The uranium favourability index value shows that the pink granite and the anomalous zones in and around the trenches show relative high potentiality for uranium. The migration of uranium in and out of granite is indicated, where the leached components are found in some parts of the high radioactivity trench sites, while the precipitation parts (migrated in) are represent most of lithologic units in the prospect area including anomalous zones. The precipitation processes increased along and around the lineament features as faults and fractures especially near the trenches and anomalous zones. The radiation dose rates in the study area are higher than the level of the IAEA (2000) recommendation which is 1mSv/y | ||
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