الفهرس 
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Abstract
Wadi Sannad area is located at the south-central Sinai close to the Katherine town. The area covers about 102 km2, of the crystalline massif rocks. Wadi Sannad area is located between longitudes 34° 3’ 00” and 34° 7’ 00” E and latitudes 28° 33’ 00” and28°37’ 00” N. The aim of the present study is concerned mainly with geochemical prospection and heavy mineral survey of stream sediments of a selected locality (Wadi Sanned area). To achieve this aim systematic studies were done as follow:I-Construction a base map for the study area by the aid of aerial photographs, topographic maps and previous geologic maps. 2- Determination of the general geologic setting of the area, field relations and sampling of the bedrocks (country rocks). 3- Studying the petrography of the bedrock samples including microscopic identification of rock forming minerals and their modal composition then carrying out chemical analysis on these rocks. 4- Carrying out a mineralogical study of heavy minerals separated from dry stream sediments of Wadi Sannad and correlating it with their geochemistry and geochemical maps of the analyzed elements in the bulk minerals. 5- Constructing distribution maps for each heavy mineral. 6- Carrying out chemical analyses of the separated heavy minerals by XRF. 7- Statistical analyses of geochemical data and extraction of different parameters for interpretation of these data. 8- Evaluation of heavy minerals carrying trace and rare earth elements. 9-Evaluation of the economic potentiality of the studied stream sediments. According to Zalata et al. (1993) and the present study, the rocks cropping out at Wadi Sannad area are belonging to the Pan African rock assemblage and the Phanerozoic alkaline rocks. These rocks are classified as the following units beginning with the oldest: 1- Arc Magmatism: A- Older granites1- Granodiorite. II- Late to Post Tectonic Magmatism A- Younger granites. 1- Monzogranite. 2- Syenogranite. 3-Alkali feldspar granites B- Post granite dykes. 1-Basalt dykes. 2-Andesite dykes. III- Phanerozoic Katherine Ring Complex: 1- Quartz monzonite. 2- Alkaline granites. 3- Micro- quartz syenite porphyry. 4- Alkaline rhyolite porphyry. I-1- Granodiorite: The granodiorite rocks are exposed in most northeastern part of the area. They have greyish colour and are coarse-grained and granular in texture. They form rugged topography with moderate mountains. The granodiorites show sharp contacts with younger granites. They enclose enclaves with variable sizes, shapes and composition. The rocks are composed of plagioclase (An29-32; 38.6 %), quartz (30.6 %), K-feldspar (21.5 %), biotite(8.6 %), homblende (1.0%) and accessories apatite, opaques, zircon and sphene (0.8 %). The rocks exhibit myrmekitic and perthitic textures. II-I- Monzogranites: Monzogranite rocks are exposed in the eastem and southern parts of the studied area forming elongate mass. They also occur as small isolated hills distributed in the studied area. Monzogranites are hard massive rocks with whitish pink colour. They show exfoliation and block weathering and have sharp contacts with old granites. The rocks are composed of quartz (37 %), K-feldspar (orthoclase, orthoclase microperthite and microcline microperthite; 30.3 %), plagioclase (An22-28; 30.7 %), biotite (1.4 %) with accessory muscovite, hornblende, sphene, zircon, allanite and opaques (0.5 %). Myrmekitic and perthitic textures are well developed.