Remote Sensing, Geology and Geochemistry on the Gviii Uranium Mineralization, Gabal Gattar, North Eastern Desert, Egypt

Elkholy, Darweesh; Elhusseiny, Mohamed; Saleh, Wafaa H.; El-Zalaky, M. A.

doi:10.21608/nssj.2012.31039

Cited by 2 publications

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“…There are more than twenty uranium occurrences in the northern parts of G. Gattar granite (Shalaby, 1996;El Zalaky, 2002;El Kholy el al., 2012). These occurrences were ISSN 2314-5609 Nuclear Sciences Scientific Journal 9, 27-53 acterized by low to moderate relief, exfoliation and boulder weathering.…”

Section: Introductionmentioning

confidence: 99%

Geological, Mineralogical and Geochemical Aspects of the Granitic Rocks at Umm Nafie Area, North Eastern Desert, Egypt

Elbalakssy

STEET²,

TOHAMY³

2020

Nuclear Sciences Scientific Journal

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Wadi Umm Nafie area is located between lat. 26˚18`-27˚05`N and long. 33˚23`and 33˚29`E. The rocks cropping out in the area are older granitoids and younger granites. The studied area displays secondary structures which are represented by joints and faults. The most predominant fault sets are trending in NE-SW, NNW-SSE and NW-SE directions. Petrographically, the older granitoids are classified as quartz diorites and the younger granites as syenogranites. The radioactivity of the syenogranites is significantly high, comparing with the older granitoids. The anomalous syenogranite (about 1x5m dimensions) exhibits equivalent uranium occurrences that vary considerably in their contents from 115.5 to 125 ppm with an average of 122.8 ppm and from 139.2 to 168.6 ppm equivalent thorium with an average of 155.4 ppm. Th-U, Zr-U, Zr-Th, , Nb-U, Nb -Th relationships show ill-defined trends, suggesting that radioelements distribution aren't controlled by accessory minerals but essentially related to the latter hydrothermal solutions. Anomalous syenogranite is affected by various phases of hydrothermal alteration processes along brittle structures, comprising hematitization, chloritization, epidotization, silicification and kaolinitization. Unusual REEs patterns and non-CHARAC ratios of isovalents confirm that the anomalous syenogranite is affected by late stage hydrothermal solutions resulting fluid-rock interaction and M-type tetrad effect. U and REEs could be leached from the sheared syenogranite at low pH conditions and precipitated in alkaline environments by hematitization process. The main minerals occur in the highly radioactive syenogranite are thorite, uranothorite, betafite, yttrocolumbite, samarskite, ishikawaite, polycrase and fergusonite, in addition to zircon, xenotime, allanite, cerite and monazite.

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Section: Introductionmentioning

confidence: 99%

Geological, Mineralogical and Geochemical Aspects of the Granitic Rocks at Umm Nafie Area, North Eastern Desert, Egypt

Elbalakssy

STEET²,

TOHAMY³

2020

Nuclear Sciences Scientific Journal

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“…The Egyptian younger granites are fa-ISSN 2314-5609 Nuclear Sciences Scientific Journal 6, 55-70 2017 http://www.ssnma.com vourable host rocks for U-mineralization in many parts of the Eastern Desert and Sinai, e.g. Gabal Gattar (Shalaby, 1995;El-Kammar et al, 2001;Shalaby et al, 2010 andEl Kholy et al, 2012), Gabal El Missikat (Abu Deif et al, 2007 &El-Tahir, 2008), Gabal Um Ara (Abdalla, 1996 &Dawood andAbd El-Naby, 2001) Several authors previously studied W.…”

Section: Introductionmentioning

confidence: 99%

Radioactivity, Mineralogy and Rare Earth Elements (Ree) Geochemistry of Monzogranites and Alkali-Feldspar Granites, Wadi Hawashia, North Eastern Desert, Egypt

Elhusseiny¹

2017

Nuclear Sciences Scientific Journal

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The studied monzogranites and alkali-feldspar granites of W. Hawashia, North Eastern Desert of Egypt occur as small granitic mass intruding the granodiorites. The monzogranites represent the central part of the mapped area and are intruded by the alkali-feldspar granites forming a small mass or cupola at the roof of the monzogranites. The alkali-feldspar granites cut by faults trending in NNW-SSE, E-W and NNE-SSW directions and show brecciation and local silicification, hematitization, sericitization and chloritization. Petrographically, the monzogranites are essentially composed of plagioclase, quartz, alkali-feldspars and biotite. The accessory minerals are apatite and zircon. The alkali-feldspar granites are mainly composed of K-feldspars, quartz, albite and biotite, while zircon, allanite, samarskite and violet fluorite are the accessory minerals. Chondrite-normalized REE patterns show that the alkali-feldspar granites have higher REE content (∑REE= 202ppm) than the monzogranites (∑REE= 43ppm). The monzogranites have small negative Eu anomaly reflecting high contents of plagioclase, while the alkali-feldspar granites show large negative Eu anomaly suggesting highly fractionated magma characterized by the least content of plagioclase. The chemical analyses of uranium and thorium indicate that the examined alkali-feldspar granites are characterized by higher U and Th contents (averages are 73 and 119 ppm, respectively) compared with the studied monzogranites (averages are 9 and 21 ppm, respectively). Detailed microscopic investigations supported by X-ray diffraction (XRD) and Environmental Scanning Electron Microscope (ESEM) with EDX microanalyzer for the radioactive alkali-feldspar granite samples revealed the presence of uranophane as secondary uranium mineral and thorite as thorium mineral beside some U-bearing accessory minerals such as samarskite, allanite, metamict zircon and violet f luorite.

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Remote Sensing, Geology and Geochemistry on the Gviii Uranium Mineralization, Gabal Gattar, North Eastern Desert, Egypt

Cited by 2 publications

References 0 publications

Geological, Mineralogical and Geochemical Aspects of the Granitic Rocks at Umm Nafie Area, North Eastern Desert, Egypt

Geological, Mineralogical and Geochemical Aspects of the Granitic Rocks at Umm Nafie Area, North Eastern Desert, Egypt

Radioactivity, Mineralogy and Rare Earth Elements (Ree) Geochemistry of Monzogranites and Alkali-Feldspar Granites, Wadi Hawashia, North Eastern Desert, Egypt

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