Abstract
Ras Baroud area has several rock units arranged from the oldest to the youngest as: older granites,younger granites, pegmatites, dykes and quartz veins. Younger granite of Ras Baroud is exposed as smallsemirounded isolated mass, which is medium to coarse grained and pink to reddish pink in color. Thisgranite is dissected with several types of dykes ranging from basic to acidic ones. Pegmatite body isencountered at the peripheral parts of this granite. It is compositionally zoned, being composed of massivemilky quartz in the core and pink color blocky K-feldspars with subordinate nest like aggregates ofyellowish white mica the outer rim.Ras Baroud granite is composed mainly of K-feldspars, plagioclase quartz and micas (biotite andmuscovite) associated with zircon, titanite, and opaque as accessory minerals. On the other hand, thesecondary minerals are represented by sericite and chlorite.The pegmatite bodies at the northern periphery of Gabal Ras Baroud consist essentially of orthoclase,quartz, plagioclase and mica (muscovite and biotite). The accessory minerals include zircon, allanite,fluorite and opaques.Compared to the parent granitic pluton, the pegmatite body has higher concentrations of Zr, Rb, Y, Ba,Pb, Nb and lower Cu, Sr concentrations. It is important to notice that the variation in the concentrationof trace elements in the studied pegmatite samples may be due to the difference in the mineralogicalcomposition of these samples.Uranium content in pegmatite body ranges from 10 ppm to 235 ppm with an average 84 but thethorium content range from 1 ppm to 309 ppm with an average 95.Pegmatite body of Ras Baroud has several important rare-metal bearing minerals include;samarskite-Y, columbite, cassiterite, zircon, fluorite and rutile in addition to some opaque minerals asmagnetite and ilmenite.
Highlights
Ras Baroud area is located in the Central Eastern Desert of Egypt, directly to the north of Qena Safaga asphaltic road at 35Km from Safaga city
The present work deals with the geology, petrography, geochemistry and mineralogy of pegmatite body at the northern periphery of G.Ras Baroud to determine the type of this pergmatite and its uranium content and to identify the radioactive minerals which may be found
The obtained fractions resulted from the magnetic separation were studied carefully using the binocular stereomicroscope and the X-ray diffraction technique (XRD)
Summary
Ras Baroud area is located in the Central Eastern Desert of Egypt, directly to the north of Qena Safaga asphaltic road at 35Km from Safaga city. Surour et al (2004) studied the structural state and the geochemistry of columbite from the rare-metal pegmatites of Ras Baroud granite. They show a compositional range from mangano to ferrocolumbite at the cores to rims. Raslan et al (2010) identified samarskiteY, columbite and zircon from pegmatite bodies and the stream sediments surrounding Ras Baroud granitic pluton They studied the rare metals within pegmatites at G. The term “rare elements” or “rare metals” is generally used to encompass a variety of elements such as tantalum, niobium, beryllium, lithium, zirconium, and rare–earth elements (REEs) concentrated in acidic magmatic rocks, pegmatites and carbonatite complexes. The present work deals with the geology, petrography, geochemistry and mineralogy of pegmatite body at the northern periphery of G.Ras Baroud to determine the type of this pergmatite and its uranium content and to identify the radioactive minerals which may be found
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