“…It lies at a distance of about 22 km SW of Abu-Ramad city (Figure 1 ). It is bound by Latitudes 22° 17' 50" – 22° 18' 6" N and Longitudes 36° 13' 36" - 36° 14' 22" E. The geology, mineralogy, geochemistry and radiometry of El Sela area was studied by several authors, e.g., Basta and Saleeb ( 1971 ), Hussein et al ( 1973 ), Hussein ( 1977 ), El-Gaby et al ( 1988 ), Nasr and Youssef ( 1995 ), Assaf et al ( 1999 ), Abdel-Meguid et al ( 2003 ), Khalaf ( 2005 ), Gaafar ( 2005 ), Ibrahim et al ( 2005 ), Abd Elaal ( 2006 ), Gaafar et al ( 2006 ), Abu Donia ( 2006 ), Ibrahim et al ( 2007 ), El Afandy et al ( 2008 ), Abd El-Naby and Dawood ( 2008 ), Ali ( 2011 ), Ali and Lentz ( 2011 ), Shahin ( 2011 ), Bayoumi ( 2011 ), Gamil et al ( 2012 ), Aly ( 2013 ) and Abdel Gawad et al ( 2014 ). Figure 1 Location map and Google image for the studied area.…”
El Sela shear zone occurs in the younger granite rock of Gabal El Sela area, south Eastern Desert, Egypt near the Sudan Frontier. It comprises lines–arranged intrusions trending ENE-WSW and extend for about 1.5 km in length and reach up to 40 meters in width. These lines–arranged intrusions include multi-phase quartz veins, altered microgranite and altered basic dykes. These dykes hosting or acting as a source for uranium, rare metals (Zr, Y, Nb and Ga) and light rare earths (La, Ce, Sm and Nd) mineralizations. They show highly alteration, uranium enrichment and a strong enrichment in some rare metals and light rare earths contents (Zr = 644, Y = 133, Nb = 136, Ga =184, La = 50.19, Ce = 105.47, Sm = 24.81, Nd = 78.91 ppm and and ∑ LREEs = 259.38.). The chondrite normalised rare earth elements trends indicate strongly fractionated rare earth elements pattern with significant enriched of LREE according to HREE in both altered microgranite and altered basic dykes. Field radiometric measurements of the studied altered microgranite dyke revealed that eU reach up to 359 ppm with an average 78 ppm, while in the altered basic dyke reach up to 1625 ppm with an average 144 ppm.
“…It lies at a distance of about 22 km SW of Abu-Ramad city (Figure 1 ). It is bound by Latitudes 22° 17' 50" – 22° 18' 6" N and Longitudes 36° 13' 36" - 36° 14' 22" E. The geology, mineralogy, geochemistry and radiometry of El Sela area was studied by several authors, e.g., Basta and Saleeb ( 1971 ), Hussein et al ( 1973 ), Hussein ( 1977 ), El-Gaby et al ( 1988 ), Nasr and Youssef ( 1995 ), Assaf et al ( 1999 ), Abdel-Meguid et al ( 2003 ), Khalaf ( 2005 ), Gaafar ( 2005 ), Ibrahim et al ( 2005 ), Abd Elaal ( 2006 ), Gaafar et al ( 2006 ), Abu Donia ( 2006 ), Ibrahim et al ( 2007 ), El Afandy et al ( 2008 ), Abd El-Naby and Dawood ( 2008 ), Ali ( 2011 ), Ali and Lentz ( 2011 ), Shahin ( 2011 ), Bayoumi ( 2011 ), Gamil et al ( 2012 ), Aly ( 2013 ) and Abdel Gawad et al ( 2014 ). Figure 1 Location map and Google image for the studied area.…”
El Sela shear zone occurs in the younger granite rock of Gabal El Sela area, south Eastern Desert, Egypt near the Sudan Frontier. It comprises lines–arranged intrusions trending ENE-WSW and extend for about 1.5 km in length and reach up to 40 meters in width. These lines–arranged intrusions include multi-phase quartz veins, altered microgranite and altered basic dykes. These dykes hosting or acting as a source for uranium, rare metals (Zr, Y, Nb and Ga) and light rare earths (La, Ce, Sm and Nd) mineralizations. They show highly alteration, uranium enrichment and a strong enrichment in some rare metals and light rare earths contents (Zr = 644, Y = 133, Nb = 136, Ga =184, La = 50.19, Ce = 105.47, Sm = 24.81, Nd = 78.91 ppm and and ∑ LREEs = 259.38.). The chondrite normalised rare earth elements trends indicate strongly fractionated rare earth elements pattern with significant enriched of LREE according to HREE in both altered microgranite and altered basic dykes. Field radiometric measurements of the studied altered microgranite dyke revealed that eU reach up to 359 ppm with an average 78 ppm, while in the altered basic dyke reach up to 1625 ppm with an average 144 ppm.
El Sela area is mainly covered by ophiolitic mélange (Sul Hamed), biotite granite, two-mica granite (El Sela), muscovite granites (Qash Amer), and cross cut by microgranite dolerite and bostonite dikes as well as quartz and japser veins. These granitic rocks are hydrothermally altered, especially around El Sela ENE-WSW shear zone, that causing hydrothermal alterations accompanied by radioactive mineralization. These rocks are mainly composed of alkali feldspar, quartz, muscovite, and biotite with zircon, fluorite, apatite and iron oxides as an accessory minerals. The radioactive minerals are represented by uranophane, autunite, meta-autunite and phurcalite which are restricted in the highly sheared microgranite, dolerite dikes as well as jasper veins. Uranium contents (eU) range from 10.1 to 17.7 ppm at Qash Amer with their thorium contents (eTh) vary from 5.8 to 22.7 ppm. El Sela granites have uranium contents (eU) range from 6.4 to 19.7 ppm with equivalent thorium content (eTh) range between 14.0 and 44.9 ppm. The eU-eTh, (eU/ eTh)-eU and eU-[eU+(eTh X 3.5)] diagrams show depletion of uranium for both the Qash Amer and El Sela granitic samples, suggesting that uranium may be leached out of the original rock towards the ENE-WSW and NNW-SSE shear zones. The migrated uranium (Um) amount was calculated and indicated as either migration out or migration in at Qash Amer and El Sela granites, mostly to the shear zone cutting through the area. Absorbed Dose Rate (D), annual effective dose equivalent (AEDE), radium equivalent activity (Raeq), external (Hex) and internal (Hin) hazard index, in addition to activity gamma index (Iγ) caused by gamma emitter natural radionuclide were determined from the obtained values of 238 U, 232 Th and 40 K. Most of the studied samples have radiological parameters values higher than the international recommended values suggesting that El Sela and Qash Amer granitic rocks are hazardous and not recommended for use as ornamental stones with respect to workers and human beings.
“…36 NE L 1,2,3 Qash Amir area, south Eastern Desert, Egypt. Shahin [10] studied the occurrence of uraniferous iron and manganese oxide deposits in biotite granite north east Gabal El Sela area. He concluded that the uraniferous iron and manganese oxide deposits and the hydroxides associated with kaolinite may represent a gossan on the top of a vein-type Ubearing deposit.…”
Abstract:Gabal Adara Adatalob granite in the south Eastern Desert, Egypt represents a promising example for hydrothermally altered and fractured granite hosting rare metals and rare earths mineralization. This granite host or act as a source for the rare metals (Zr, Y, Nb, Yb and Ga) and rare earths (La, Ce, Pr, Nd, Sm, and Yb) mineralization. It forms isolated pluton crop out in the wadi Ed Direira area. It shows highly alteration and a strong enrichment in some rare metals and rare earths contents (Zr = 1434, Y = 629, Nb = 258, Ga =39, La = 262.18, Ce = 546, Pr = 71.91, Nd = 366.88, Sm = 101. 46, Yb = 8.12 ppm). Field radiometric measurements for this granite revealed that low uranium and thorium content. The radioactivity level reaches up to 10.1 ppm (eU), 24.2 ppm (eTh) respectively. The chondrite normalized rare earth elements, trends indicate strongly fractioned rare earth element pattern with significant strong enrichment in light rare earth elements rather than heavy rare earth elements.
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