MINERALOGICAL AND RADIOMETRIC STUDIES OF STREAM SEDIMENTS SURROUNDING GABAL ABU EL HASSAN, CENTRAL EASTERN DESERT, EGYPT

Wafaa Younis Abdel Latif Baddour


Abstract


Gabal Abu El Hassan area is located between Lat. 26°50΄-27°00΄N and Long. 33°10΄-33°20΄E. It constitutes a part of the Pan-African belt in the Central Eastern Desert of Egypt. The essential rock units encountered in the area are: metavolcanics, serpentinites, gabbroic rocks, older granites, Dokhan volcanics, Hammamat sediments, younger granites and post granitic dykes. Gabal Abu El Hassan is traversed by three main tributaries parallel to the major faults in the area. These tributaries drain at NE-SW to E-W direction. Wadi Abu El Hassan basin has a high average bifurcation ratio (7.9). This means that such basin has elongated shape of low rate of runoff velocity. The basin of the study area shows high drainage density value indicating impermeable subsurface materials, sparse and/or rugged mountainous relief. These conditions favor limited contribution of local rain fall to the groundwater. The objectives of this work are mainly to investigate secondary dispersion of radioactive minerals in the stream sediments which is considered as a tool for exploration of radioactive anomalies, to compare between the mineralogical composition of stream sediments in different tributaries, to search for radioactive minerals and U-Th bearing minerals in different sizes of stream sediments and to investigate the sources of radioactivity among the different components of stream sediments. To achieve these objectives, several analytical methods were incorporated including field work, sampling, grain size analyses, radiometric investigations, mineralogical investigations using heavy minerals separation, microscopic investigations, X-ray diffraction, Environmental Scanning Electron Microscope (ESEM) and geochemical analysis using XRF technique and Spectrophotometric determination of U and Th. A total number of 35 stream sediments samples were collected from the streambed sediments of three major tributaries of G. Abu El Hassan


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Issue Date 2018
URI http://research.asu.edu.eg/handle/12345678/2590


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