BEHAVIOR OF THE TRACE AND RARE EARTH ELEMENTS IN THE PEGMATITIC ROCKS OF EL MISSIKAT-EL EREDIYA AREA, CENTRAL EASTERN DESERT, EGYPT | ||||
| Nuclear Sciences Scientific Journal | ||||
| Article 6, Volume 9, Issue 2, October 2020, Page 85-99 PDF (5.71 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/nssj.2020.265530 | ||||
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| Authors | ||||
| MOHAMED ABD EL MONSIF; EHAB K. ABU ZEID | ||||
| Nuclear Materials Authority,Cairo, Egypt | ||||
| Abstract | ||||
| The pegmatitic rocks of El Missikat-El Erediya area are granitic pegmatites composed mainly of potash feldspar and quartz. They are low radioactive rocks without any radioactive minerals and have rare crystals of zircon, xenotime, cassiterite and violet fluorite that considered as good hostile for the rare earth elements. El Missikat pegmatite follow the trend of primitive rock, while El Erediya pegmatite is more evolved proved by lower Ba/Rb ratio (0.048), higher Rb/Sr ratio (187.08) and lower Eu concentrations (<0.05) rather than El Missikat pegmatite. The study concluded four reasons for poverty of the radioelements in the studied pegmatites 1) Consuming of the radioelements in the earlier rocks (granites), 2) Rarity of the post-magmatic processes, 3) The studied pegmatites originated from low-volatile melt and 4) Leachability of uranium by meteoric water as proved by high Th/U ratio and D-factor. | ||||
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