APPLICATION OF GROUND GEOPHYSICAL-DATA TO THE URANIUM OCCURRENCES OF EL-EREDIYA AREA, CENTRAL EASTERN DESERT, EGYPT

Ground geophysical surveys were conducted in El-Erediya prospect area, located in the Central Eastern Desert, Egypt. These surveys include g round magnetic and spectrometric. The integration of the results obtai ned from the magnetic data, aided by geological information, led to th e construction of basement tectonic map for the area under considerati on. Gamma-ray spectrometric data revealed that the jasperoid veins, fa ults zones and fracture zones in the El-Erediya area are reflected by the highest spectrometric concentration, whereas granites are reflecte d by the highest radioactivity rock unit in the area; the amphibolites show up with the lowest radiometric level. The qualitative and quanti tative analysis of the observed magnetic anomalies in relation to the main structural and lithologic manifestations reveals that the average depth to the causative magnetic bodies lies within the basement compl ex, at two disturbing interfaces 80 and 250 m. From the application of the autocovariance function to the different magnetic and spectrometr ic data of the studied area, one can state that: there might by radioe lement mineralization (U) controlled by WNW structural and having a de ep seated fault system; there might be radioelement mineralization (K, eTh) controlled by NW structural and having a deep seated fault syste m; the EW near surface structure is of shallow origin. Copyright (C) 1 997 Elsevier Science Ltd