Characterization of a Post Orogenic A-Type Granite, Gabal El Atawi, Central Eastern Desert, Egypt: Geochemical and Radioactive Perspectives

Abstract

The alkali feldspar granite of Gabal El Atawi is post orogenic granite originated from subalkaline magma in extensional suite. It is developed within plate tectonic setting and has A 2 -type character which generated from apparent crustal source. The petrographic, geochemical and radioactive characteristics of El Atawi granite meet and fulfill the requirements of being fertile granite and it can be considered as promising uraniferous granite. Fluid inclusion studies of the altered granite elucidated two different solutions acting on the host granitic pluton. The first is NaCl-CaCl low temperature fluid with a wide range of salinity. The second is high temperature and salinity Fe-Mg-Na chloride solution. Different fractures in the granite acted as good channels for the hydrothermal fluids that leached uranium from its bearing minerals disseminated all over the host granite and redeposited it in the alteration zones.

Mineralogical and Geochemical Characteristics of El-Missikat Fluorite Mineralization, Central Eastern Desert, Egypt: Trace Elements and Fluid Inclusions Constraints

“…This may apply to fluorites of El-Missikat area. There is close similarity in REY pattern of the present fluorites and Sardinian fluorites, Italy (group A) (Castorina et al 2008) and other fluorite areas in the Eastern Desert of Egypt (Mahdy et al 2013 andFawzy, 2017). Fleischer (1969) showed that the fluorites from a single location may exhibit different REE abundances, controlled by the variability of the parameters governing the mineralizing process.…”

“…Numerous geological and geochemical data on the fluorite veins in the Eastern Desert were carred out (e.g. Yonan,1990;El-Mansi, 1993;Mohamed and Bishara, 1998;Fawzy et al,1996;Fawzy, 2001;Salem et al, 2001;Ali, 2001;Yonan and El-Kammar, 2001;Mohamed, 2013;Mahdy et al, 2013, El Hadek et al, 2016and Fawzy, 2017.…”