الفهرس 
Genetic model of alterations and uranium mineralization in the granitic rocks
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Abstract
The present study deals with geological mapping, petrographical, mineralogical, geochemical and radioactive studies. El-Maghrbia area lies between Latitudes 26{u00B0} 18’ 35’’ and 26{u00B0} 24’ 43’’ N and longitudes 33{u00B0} 22’ 11’’ and 33{u00B0} 30’ 42’’ E in the Central Eastern Desert of Egypt. The detailed field observations detected El Maghrbia and El Eredyia granites intrusions at El-Maghrbia area. The studied area is dissected by quartzfeldspar porphyry and doleritic dikes as well as intrusions of quartz and jasperoid veins that dissected all rock types as a latest event. Microscopically, El Maghrbia granite consists mainly of quartz, feldspar, plagioclase and biotite. El Eredyia granite is composed mainly of quartz, Kfeldspar, plagioclase, biotite and muscovite. Zircon, apatite, fluorite and epidote as well as uranium minerals crystals are the accessory minerals whereas sericite, kaolinite, chlorite and iron oxides are present as secondary minerals. Quartzfeldspar porphyry dikes characterized by phenocrysts of quartz and plagioclase in fine-grained groundmass of the same mineral composition. Doleritic dikes composed of plagioclase phenocrysts, pyroxene, hornblende and ferruginous materials. El Eredyia granites are affected by varying degrees of alterations especially along major fracture zones and contacts with jasperoid veins. Silicification, kaolinitization, and ferrugination are the most common alterations along major and minor fractures