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İstanbul Teknik Üniversitesi (2016)

Genesis of the gold mineralization at atud area, central eastern desert of Egypt : geological, ore mineralogical and geochemical approaches

KHALIL Amr Abdelnasser Ali

Titre : Genesis of the gold mineralization at atud area, central eastern desert of Egypt : geological, ore mineralogical and geochemical approaches

Atud Bölgesi, Mısır’ın Orta Doğu Çölü’ndeki altın cevherleşmesinin kökeni : Jeolojik, cevher mineralojik ve jeokimyasal yaklaşımlar

Auteur : KHALIL Amr Abdelnasser Ali

Université de soutenance : İstanbul Teknik Üniversitesi

Grade : Doctor of Philosophy (PhD) 2016

Résumé partiel
This thesis provides comprehensive geological, petrographical, mineralogical, and geochemical studies of the gold deposit at Atud area at the Central block of the Egyptian Eastern Desert. It aims to provide a better understanding of the genesis of this vein-type mesothermal gold deposit and its relation to the tectonic evolution of the Arabian-Nubian Shield at East Africa. Electron microprobe (EMPA) and stable isotope analyses are also carried on to identify the conditions of the gold deposition and the mineralizing fluid according to the appropriate geothermometers, as well as to determine the temperature of the ore systems and the source, evolution, and nature of the ore-bearing fluids. Moreover, ASTER imagery data are used to delineate and detect the main alteration types associated with the gold mineralization at Atud area. The study area (Atud area) that located in the Central Eastern Desert of Egypt is made up of a gabbro-diorite intrusion emplaced into the pre-existing rocks ; serpentinite and metatuffs and is cut by a younger intrusion of olivine gabbronorite. The vein-type gold deposits in the Atud area are related to the metagabbro-diorite complex that occurred in Gabal Atud in the Central Eastern Desert of Egypt. The dispersed talc-carbonate, dolomitic marble and calc-silicate rocks are derivatives of serpentinite around Gabal Atud. They represent the Pan-African dismembered ophiolitic rocks exposed in the study area. Metatuffs cover a vast area of the area around Gabal Atud where they form low-lying outcrops associated with serpentinite rocks. They are microscopically differentiated into different varieties ; mafic lapilli metatuffs, intermediate metatuffs, metacherts, and quartz-biotite schists. The metagabbro-diorite complex covers a large proportion of the mapped area and exists as a semicircular body of Gabal Atud. It represents one of the early orogenic gabbro-diorite complexes in the Arabian-Nubian Sheild and its age ranges from 987 to 830 Ma. It had an obvious intrusive contact against serpentinites and metatuffs and later was invaded by olivine gabbronorite. It also was cut by numerous mineralized and barren quartz veins and dikes at its eastern and southeastern slopes, where NW-SE brittle-ductile shear zone cuts through this complex

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