Mineralogy of polymetallic mineralized pegmatite of Ras Baroud granite, Central Eastern Desert, Egypt

Raslan, Mohamed Fahmy; El‐Shall, H.; Omar, Sayed; Daher, A. M.

doi:10.2465/jmps.090201

Cited by 28 publications

(15 citation statements)

References 16 publications

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“…Radioactive pegmatites have been recorded in many localities in the Eastern Desert of Egypt (Sayyah et al, 1993;Ibrahim et al, 1997;Ali, 2001;Ibrahim et al, 2001;Ali et al, 2005;Abdel Warith et al, 2007;Raslan et al, 2010). Also, several studies worldwide have revealed the presence of granite-pegmatite-hosted rare-metal mineralizations (Matsubara et al, 1995;Hanson et al, 1998;Erict, 2005;William et al, 2006;Pal et al, 2007).…”

Section: Discussionmentioning

confidence: 93%

“…The average composition of the analyzed thorite ( The studied thorite is sporadic in U distribution, suggesting non-uniform redistributions of UO 2 within thorite during post magmatic processes. Several authors reported the presence of thorite inclusions in rare metal mineralization and accessory heavy minerals separated from some Egyptian pegmatites (Raslan et al, 2010;Ali et al, 2005;Abdel Warith et al, 2007).…”

Section: Zircon-thorite Associationmentioning

confidence: 96%

“…Radioactive pegmatites have been recorded in many localities in the Eastern Desert of Egypt; e.g. the pegmatitic bodies of the Gabal Ras Baroud younger granites (Sayyah et al, 1993: Raslan et al, 2010 uranium and columbite mineralization in the pegmatites related to the Gabal Abu Dob younger granites (Ibrahim et al, 1997), and radioactive pegmatites related to the Gabal El-Sibai alkali feldspar granites (Ali, 2001). Anomalous pegmatites associated with granitic rocks have also been reported in the southern part of the Eastern Desert (Ibrahim et al, 2001;Ali et al, 2005;Abdel Warith el al., 2007).…”

Section: Introductionmentioning

confidence: 97%

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Mineralogy and radioactivity of pegmatites from South Wadi Khuda area, Eastern Desert, Egypt

2010

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Radioactive minerals in pegmatites associated with granitic rocks are commonly encountered in the south of the Wadi Khuda area and found as dyke-like and small bodies. They are observed within garnet-muscovite granites near the contact with older granitoids. Field surveys indicated that the studied pegmatites vary in dimensions ranging from 2 to 10 m in width and from 10 to 500 m in length. They are composed mainly of intergrowth of milky quartz, reddish-pink K-feldspar and plagioclase together with small pockets of muscovite.Field radiometric measurements indicated that radioactivity in pegmatites is more than twice that of their enclosing country rocks. Radionuclide measurements revealed that the average contents of U and Th increase gradually from rocks of dioritic to granodioritic composition (1.5×10 -6 U and 4.3×10 -6 Th) and increase significantly in biotite granites (5.8×10 -6 U and 15.2×10 -6 Th) but drastically decrease in muscovite granites (2.2×10 -6 U and 5.6×10 -6 Th). The average contents of U and Th of anomalous pegmatites are 95.3×10 -6 and 116.9×10 -6 , respectively, indicating their uraniferous nature. In the south of the Wadi Khuda area, pegmatites are low in average Th/U (1.4) and high in average U/K (35.6), which suggests that uranium concentrating processes did not affect the pegmatites, indicating poor source-rocks.Mineralogical investigations of the studied pegmatites revealed the presence of secondary uranium minerals (kasolite and autunite), in addition to zircon, thorite, apatite, garnet and biotite. Primary and secondary radioactive mineralizations indicated that the mineralization is not only magmatic, but also post-magmatic. Electron microprobe analyses showed distinct cryptic chemical zoning within thorite where UO 2 decreases from core to rim. This feature in thorite is sporadic, suggesting non-uniform redistributions of UO 2 within thorite during magmatic processes.

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Section: Discussionmentioning

confidence: 93%

Section: Zircon-thorite Associationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

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Mineralogy and radioactivity of pegmatites from South Wadi Khuda area, Eastern Desert, Egypt

2010

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“…Also, they added the cryptically zoned columbite crystals with Fe-rich rims suggest remarkable reducing conditions during the columbite crystallization which is also responsible for the formation of minute pyrite crystals found in the peripheral zone. Raslan et al (2010) identified samarskite-Y, columbite and zircon from pegmatite bodies and the stream sediments surrounding Ras Baroud granitic pluton. They studied the rare metals within pegmatites at G. Ras Baroud and clarify the importance of these pegmatites as hosts of accessory minerals of rare metals, REEs and radioactive elements.…”

Section: Introductionmentioning

confidence: 99%

Mineralogy and Trace Elements Geochemistry of Pegmatite Body at the Northern Periphery of Gabal Ras Baroud, Central Eastern Desert, Egypt

Monsif

Nahas

Abdallah

2018

Nuclear Sciences Scientific Journal

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Ras Baroud area has several rock units arranged from the oldest to the youngest as: older granites, younger granites, pegmatites, dykes and quartz veins. Yo u nger granite of Ras Baroud is exposed as small semirounded isolated mass, which is medium to coarse grained and pink to reddish pink in color. This granite is dissected with several types of dykes ranging from basic to acidic ones. Pegmatite body is encountered at the peripheral parts of this granite. It is compositionally zoned, being composed of massive milky quartz in the core and pink color blocky K-feldspars with subordinate nest like aggregates of yellowish white mica the outer rim. Ras Baroud granite is composed mainly of K-feldspars, plagioclase quartz and micas (biotite and muscovite) associated with zircon, titanite, and opaque as accessory minerals. On the other hand, the secondary 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 concentration of trace elements in the studied pegmatite samples may be due to the difference in the mineralogical composition of these samples. Uranium content in pegmatite body ranges from 10 ppm to 235 ppm with an average 84 but the thorium 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 as magnetite and ilmenite.

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“…Several Nb-Ta occurrences have been recorded in different localities of the Eastern Desert, namely, El Naga, Abu Khurg, Abu Dabbab, Noweibi, and Abu Rushied (HussEin, 1990;raslan & ali, 2011). It is interesting in this regard to mention that author identified Samarskite-Y, columbite and zircon from Ras Baroud granite -pegmatite in the Central Eastern Desert (raslan et al, 2010) and in the stream sediments surrounding the Ras Baroud granitic pluton (raslan, 2009).…”

Section: Introductionmentioning

confidence: 99%

Occurrence of Samarskite-Y in the Mineralized Umm Lassifa Pegmatite, Central Eastern Desert, Egypt

Raslan¹

2015

Geologija

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Samarskite-Y, with an average assay of about 43.23% Nb 2 O 5 and 17.43% Y 2 O 5 has been identified in the mineralized pegmatite bodies injected in Gabal Umm Lassifa monzogranite. The mineral is associated with columbite, zircon, monazite, cassiterite, ilmenite and rutile. The mineralogy and geochemistry of the studied samarskite variety were determined using microscopic examination and X-ray Diffraction (XRD) as well as quantitative analysis by both Field emission scanning electron microscope and electron microprobe analysis. Microscopic investigation revealed that the defined samarskite crystals are characteristically velvet-yellow brown to bloody red in color and having a characteristic pendent vitreous or resinous luster.Analytical . Accordingly, the mineralized Umm Lassifa pegmatite can be considered as a promising target ore for its rare-metal mineralization that includes mainly Nb, Ta, Y, REE and Zr together with U and Th.

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Mineralogy of polymetallic mineralized pegmatite of Ras Baroud granite, Central Eastern Desert, Egypt

Cited by 28 publications

References 16 publications

Mineralogy and radioactivity of pegmatites from South Wadi Khuda area, Eastern Desert, Egypt

Mineralogy and radioactivity of pegmatites from South Wadi Khuda area, Eastern Desert, Egypt

Mineralogy and Trace Elements Geochemistry of Pegmatite Body at the Northern Periphery of Gabal Ras Baroud, Central Eastern Desert, Egypt

Occurrence of Samarskite-Y in the Mineralized Umm Lassifa Pegmatite, Central Eastern Desert, Egypt

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