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Articles by M.G. El-Feky
Total Records ( 1 ) for M.G. El-Feky
  B.H. Ali , M.G. El-Feky , M.A. Ali and E.K. Abu Zeid
  The present study aims to elucidate the mineralogical and petrographic composition of the dykes as well as their radioactivity and factors controlling uranium mineralizations. The detailed spectrometric survey on these bostonite dykes revealed their enrichment in U and Th (700 ppm eU and 48 ppm eTh, in average, respectively). The mineralogical studies on these dykes indicate the presence uranophane and kasolite as radioactive minerals. Zircon and fluorite are the main accessory minerals and they are barren from any radioelements. The presence of the radionuclides as secondary minerals, e.g., uranophane and kasolite and their absence in the uranium-bearing minerals such as zircon and fluorite suggest that the radioactivity of bostonite is not orthomagnetic but gained post-magmatically via hydrothermal solutions. Fluid inclusion studies on quartz reveal that the temperature of the mineralizing carbonic fluids was between 282 to 303° C and give salinity values ranging from 0 to 0.9 wt% NaCl equivalent and trapped under lithostatic pressure equals 65 bar. These rich CO2-fluids caused remobilization of uranium from the magmatic zircon and fluorite in the form of uranyl-monocarbonate. Mixing of low temperature shallow meteoric aqueous fluid with hot carbonic fluids (~190° C) through fractures system and, consequently, the fluids pressure releasing to about 4.7 bar. The temperature gradient, changing pH and the fluid/rock interaction may have played active role during the post-magmatic stage that includes precipitation of secondary uranium as uranophane and kasolite.
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