الفهرس 
Importance and scope of zircon studiesOnly 14 pages are availabe for public view
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Abstract
This thesis encompasses the study of zircon crystals from gneisses and some associated rocks in three main exposures from Egypt. They are Migif - Hafafit (South west Marsa Alam-Central Eastern Desert), Meatiq (West Quseir-central Eastern Desert) and Feiran (Central south Sinai). Zircon is studied in thin section using the polarized microscope to examine its relationship with the associated minerals. It is separated using the different covenantal techniques such as heavy liquid and magnetic separation. The morphological properties of the zircon have been studied under a stereo microscope and polarized microscope and the various species of zircon are plotted on Pupin 1980 varietal diagram. Internal structures of zircon are studied using a scanning electron microscope imaging with energy dispersive X-ray (EDX) spectroscopy analysis. The main objective of this investigation is to try to resolve the controversy of the variable estimated ages of these gneisses.