الفهرس 
Geological Overview of the Eastern Desert
AIRBORNE GEOPHYSICAL SURVEYOnly 14 pages are availabe for public view
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Abstract
The present work deals essentially with the analysis and interpretation of airborne gamma-ray spectrometry and aeromagnetic over G. Umm Anab- G. El-Dob, Central Eastern Desert.The study area is located at Central Eastern Desert, Egypt between latitudes 26 36″- 27 00″ N and longitudes 33- 34 E. This area comprises a wide variety of igneous, metamorphic and sedimentary rocks. Ranging in age from Pre-Cambrian to the Quaternary. In the present study, detailed aerospectrometric gamma-ray and aeromagnetic surveys have been carried out in the prospect area on grid lines. The traverse lines took N45E direction, with spacing of 1km approximately. The tie lines were perpendicular to the traverse lines (took N 135 E direction) and spaced with about 10 km. The average speed of the aircraft ranged from 222 to 314 km/h and the nominal flying elevation was about 120 meters above sea level. The data have been treated qualitatively and quantitatively by applying various interpretation techniques. The gamma-ray spectrometric survey showed some eU, eTh
and K anomalies related to the granitic rocks, and melanocratic medium to high grade of metamorphic rock. the radiation values more than 8.6 μR/h in Tc, more than 2.70 % in K, more than 3.11 ppm in eU and more than 8.3 ppm in eTh.The radioactive heat production of the present study varying from 0.14 μWm-3 to 0.47 μWm-3 by using Bücker and Rybach equation(1996) or 0.17 μWm-3 to 0.55 μWm-3 by using Rybach(1976) equation. The higher average values are obtained for granitic rocks are1.52
μWm-3 and 1.44 μWm-3, respectively), whereas the lowest average value is obtained for melanocratic medium to high grade metamorphic rocks (0.51 μWm-3) by using Bücker and Rybach (1996) equation and ophiolitic basic metavolcanics 0.42 μWm-3 by using Rybach (1976)equation