الفهرس 
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Abstract
Gabal Dara area is one of the most important regions in its characteristic radioactivity. It had been discovered through the airborne exploration program of the Egyptian Atomic Energy Authority.
The study area is located in the Northern Eastern Desert of Egypt between latitudes 27° 50’ and 28° 05’ N and longitudes 32° 50’ and 33° 05’ E. It is essentially composed of younger (pink) granites. Gabal Dara possesses an oval shape, which represents an elongated belt of about 28 km in length and an average width of about 25 Km, trending in an N-S direction and occupies approximately 700 Km2. Generally, the area is characterized by rugged topography with moderate to high relief and comprises different rock types of the basement complex of Precambrian age including metavolcanics, metagabbro, older granitoides, dokhan volcanics, younger granites and Phanerozoic cover of Nubian Sandstones and wadi sediments.
The objective of this work is to integrate ASTER imagery, airborne gamma ray spectrometry and reflectance spectrometric measurements for mapping alteration and/or mineralization zones in Gabal Dara area and also investigate the relation between radiogenic heat production rate (RHPR) that derived from gamma-ray spectrometric data and the kinetic surface temperature (KST), which calculated from the applied ASTER-TIR imagery. The integration between the interpreted structural lineaments derived from interpreted regional and residual magnetic-component maps with the extracted process from GIS model. Finally, this will be a guide for further follow-up radioelement exploration work.
ASTER imagery processing techniques success in mapping both rock units and alteration end members using spectrometric mapping methods, such as False Color Composites (FCC), Band Ratio Codes (BRC), Feature Oriented Principal Component selection (FPCS), Spectral Angle Mapper (SAM), Spectral Information Divergence (SID), and Constrained Energy Minimization (CEM).
Air-borne gamma-ray spectrometry data showed that Younger granites have the highest radioactivity in the study area. The results showed that there is no obvious relationship between the (RHP) (does not exceed 4.6 µW/m3) and (KST) (21 to 46 Co) components which may be masked by other stronger conditions like topography, geographic location, shading, scattering, moisture, rock density, tonal variation and wind effect.
The directional analysis of the automatically extracted lineament maps (rose diagrams of both lineament directions and lengths) explained that there are main faulting trends that have been recognized that are NW-SE, NNW-SSE, E-W and N-S (in descending manner) this is besides NE-SW and NNE-SSW as a minor faulting trend.