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Wadi Ras Baroud area is located in the North Eastern Desert of Egypt, covering an area of about 170km2. It is covered by basement rocks and dissected by several wadies. The rock assemblages cropping out at Wadi Ras Baroud area comprise, quartz diorites, granodiorites, syenogranites, dykes and Quaternary sediments filling the streams of the studied area. The grain size analysis and their distribution is a fundamental descriptive measure for clastic sediments. The results of the statistical parameters are a graphic mean (Mz) ranging from 0.4φ to2φ, inclusive graphic standard deviation (σI) ranging from 1.2 to 1.9, inclusive graphic skewness (SkI) ranging from -0.3 to 0.22, and inclusive graphic kurtosis (Kg) ranging from 0.7 to 1.1. These parameters clear that they are coarse to medium sand, poorly sorted, near to coarse skewed samples, and platykurtic and mesokurtic, so these sediments are represented by the turbidity currents environments. The identified minerals in the heavy fractures are represented by magnetite, ilmenite, hematite, garnet, rutile, titanite, zircon, thorite, ferogusnite, and columbite. The radiometric study of the stream sediments of Wadi Ras Baroud indicates that the average concentrations of U and Th are 10.38ppm and 25.5ppm respectively. INTRODUCTION Ras Baroud area is located in the North Eastern Desert of Egypt between Longitudes 33 35 24 E and 330 45E and Latitudes 26 43 43N and 26 48/ 36//N (Figure 1). The area under investigation is studied by different authors e.g. Barron (1902), Sabet et al (1972), Akaad et al., (1973), Refeat et al (1977), Abu El Ela (1979), Kaoud (1982), Mahdy et al., (1994), Zalata et al (1996), and Abd El Aal (2009). The studied granite is one of the most promising uranium occurrences in the North Eastern Desert of Egypt because of its contents of abnormal high level of radioactivity. The study area covers about 170 km, (Figure 1). It is characterized by rugged topography with moderate to high relief and very arid climate. The present work is concerned with geology of rock unites covering Wadi Ras Baroud area, as well as heavy mineral concentrations and radioactivity in the stream sediments covering the main wadies dissected the area. The basement rocks of Ras Baroud area are of Precambrian age and dissected by dry wadi that filled by a wide variety of stream sediments (wadi deposits). These wadies deposits are composed of sands, gravels, and boulders. They are mainly derived from granites containing some variable heavy minerals. Geologic Setting The studied area is located in the North Eastern Desert of Egypt. The accessibility of the area is easy where the area is far from the Safaga City about 35km, and 21 km in Wadi Ras Baroud. The rock exposures are represented by older granitoides ranging from quartz diorites-granodiorites, syenogranites, and dissected by different types of basic and acidic dykes. Quartz diorites-granodiorites They composed from quartz diorite with predominance of granodiorite. They are medium-to coarse-grained containing numerous amounts of mafics. In some places, they attain high topography forming mountainous bodies with well-developed semi-rounded boulders that quarried as building stones. These rocks are the most predominant rock types exposed in the area and covering about 70 % of the total mapped area. They occupy the eastern and southern parts of the mapped area as well as the northeast corner of the studied area. (Figure 1). The contacts between these rocks and syenogranites are intrusive (Figure 2a). Moreover, these rocks are dissected with basic and acidic dikes and characterized by the common presence of pegmatite dikes, pockets and vein. Al Azhar Bulletin of Science Vol.(25) No.1, June, 29 46, 2014,. El Azab, A., Omran, A. and Hassan, A. H 30 Syenogranites The Ras Baroud syenogranites are medium to coarse-grained. These rocks are exposed as uniform masses of high relief in the northern part of the study area (Figure 1). They form, a stock-like body of semicircular outline having diameter of about 7km and an area of about 40km. In general these granites are characterized by their red to pink color and massive nature, and exfoliation weathering (Figure 2b). The weathering surfaces are characterized also by a number of rounded to sub-rounded cavities of different diameters (Figure 2c). These rocks intrude the quartz diorite-granodiorite with obvious intrusive contacts and roofpendants (Figures 2a and 2d). These rocks are dissected by post granite dikes varying in composition from acidic, basic as well as pegmatites, and quartz veins (Figure 3a). Moreover, it is associated with several pegmatite pockets and veins especially along the southern and northern peripheries of G. Ras Barud (Figure 3b). Dykes The area under investigation is dissected by numerous dikes ranging in composition from acidic to basic. They emplaced along regional fractures of north-south, northeast-southeast, east-west and northwest-southeast directions (Figure 1). The cross-cut relationships of these dykes revealed that the acidic dykes are younger than the basic ones. The acidic dikes are usually of great length extending more than 1km and their widths vary from 1m to 3m. These dikes are mainly quartz and micro-granodiorites, and less numbord of microgranite porphyries having northeast-southeast trend (Figure 3c). The basic dikes are limited, reaching to 1 km in length and 1m in width. These dikes having N-S trends (Figure 3d). They are dark and composed of basalts.

CONTRIBUTION TO THE MIERALOGY AND RADIOACTIVITY OF STREAM SEDIMENTS OF WADI RAS BAROUD AREA, NORTH EASTERN DESERT, EGYPT