الفهرس 
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Abstract
The present study is an attempt to reappraise the geological and structural setting of the Atalla Shear Zone and its environs comprising Meatiq, Fawakhir, Um Had and Hammamat areas (located in the central Eastern Desert, Egypt) based on field, remote sensing and GIS structural mapping. Remote sensing data and techniques were used to discriminate between the different rock units in the study area. This distinction was in association with a detailed field-structural investigation to be the base for a modified geological map compared to the previous published maps (e.g. Akaad and Noweir, 1980; Amer et al., 2010; Hassan et al., 2017). The results of the remote sensing study were verified through the field work and complemented by petrographic investigation. Landsat-8 (OLI, 7 bands) and ASTER (9 bands) images are the remote sensing data processed in the present study. A number of software has been used to process these images such as ENVI 5.3, ERDAS Imagine 2015, Arc GIS 10.1 and Corel Draw X7.The processes of image enhancement include different techniques, such as True Color Composite (TCC), False Color Composite (FCC), Principal Component Analysis (PCA), Minimum Noise Fraction (MNF) and Band Ratioing (BR). These techniques were applied to raise the discrimination rate between the different rock units. As a consequence, the Neoproterozoic basement succession exposed at the study area is classified into eight rock groups. These rock groups include Meatiq group, Ophiolitic melange, Island arc assemblage, syn- to late-tectonic granitoids, Dokhan volcanics, Hammamat sediments, post- Hammamat felsites and younger intrusives. Meatiq group is composed of gneisses (Gn), mylonitized granitic gneiss (MGn) and amphibolites. Ophiolitc mélange consists of blocks and matrix where blocks include metaultramafics, metagabbros and amphibolites, while matrix includes schists (talc schist, actinolite schist, tremolite-talc schist.