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Geological and Mineralogical Investigations of Microgranites at the Southeastern Part of Wadi Baroud, North Eastern Desert, Egypt |
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PP: 135-149 |
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doi:10.18576/jrna/060207
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Author(s) |
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Neveen S. Abed,
Mohamed Abdel Monsif,
Hesham M.H. Zakaly,
Hamdy A. Awad,
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Abstract |
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| Geological and mineralogical studies were conducted in the Southeastern part of Wadi Baroud in the Abu
Hadeida region. This area contains older granites, younger gabbros, and younger granites, in addition to basic and acidic
dikes. The younger granites include proper granites (lacking radioactivity) and anomalous microgranite offshoots. The
microgranite offshoots are constituted by less altered, slightly radioactive portions and highly altered, radioactive
mineralized rocks. Hematitization and silicification are the most common alteration features. The compound REEs were
refilled with F in liquids, then re-deposited in dams and microscopic veins along weak levels, resulting in formation of the
mineralized zone. The occurrence of radioelement-bearing minerals like xenotime, thorite, uranothorite, apatite, and
allanite in the studied microgranite may lead to the metamictization of minerals and a loose structure. The reaction between
metamict mineral and the hydrothermal fluid leads to an alteration in the chemical composition. The studied granites are
enriched with many rare accessory minerals, such as the euxenite-polycrase series, the columbite-tantalite series, the
samarskite group, uranium-thorium minerals, rare earth minerals (cerianite), Zircon and monazite. |
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