Petrology, geochemistry, radioactivity, and M–W type rare earth element tetrads of El Sela altered granites, south eastern desert, Egypt

Mezayen, Ahmed M. El; Heikal, Mohammed A.; El-Feky, Mohamed G.; Shahin, Hassan A. A.; Zeid, I. K. Abu; Lasheen, El Saeed R.

doi:10.1007/s11631-018-0274-7

Cited by 26 publications

(18 citation statements)

References 60 publications

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“…Abedini et al (2018) indicated that the co-existence of W-and Mshape tetrad-effects in the Kanigorgeh residual horizon of bauxite deposits in Iran supports the idea that penetration of low-pH surface waters into the upper part caused destruction of REE-bearing minerals, leaching and transportation of REE downwards and their ultimate concentration in the lower part. Conjugate types of this effect (M-and W-shape) have been reported from different environments, such as the Qahr-Abad fluorite deposit and other deposits worldwide (El Nahas et al, 2011;El Mezayen et al, 2019, Ibrahim et al, 2015El-Tohamy, 2019). The latter indicates that the existence of both W-and M-type tetrad effects in the same deposit can be related to weathering, leaching by groundwater and/or mixing of fluids and/or waters or combinations of these.…”

Section: Genesis Of Tetrad Effectsmentioning

confidence: 92%

Mineralogy and Geochemistry of Uraniferous Sandstones in Fault Zone, Wadi El Sahu Area, Southwestern Sinai, Egypt: Implications for Provenance, Weathering and Tectonic Setting

Sallam

Mira

Tohamy

et al. 2021

Acta Geologica Sinica (Eng)

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Paleozoic rocks in the Wadi El Sahu area are affected by many major faults in different directions. A reverse fault trending NE‐SW is exposed for about 300 m of its length as it cuts through the Abu Hamata and Adedia formations on the south side of Wadi El Sahu. A secondary ascending hydrothermal solution carrying heavy metals and radioactive minerals passed through the fault plain and the surrounding fractures, forming mineralized and radioactive zone. The mineralized zone thickness ranges from 60 cm to 200 cm along the fault plain. These rocks were analyzed radiometrically using a portable gamma‐ray spectrometer, chemically by employing ICP‐ES and ICP‐MS, as well as mineralogically by both binocular and Environmental Scanning Electron microscope. Gold content was also determined by fire assay. REE and U contents reached up to 2682 and 1216 ppm, respectively. Mineralogical investigations indicated the presence of uraninite, torbernite, autunite, sklodowskite, kasolite as uranium minerals, thorite as a thorium mineral, monazite, allanite and xenotime as REE‐bearing minerals, zircon and columbite as accessory minerals, gold and nickel as precious and base metals, in addition to cassiterite, chalcopyrite, chalcocite and chrysocolla. High REE and U contents are attributed to the circulation of epigenetic U and REE‐bearing hydrothermal solutions along the fault plain and its surrounding fractures. Hydrothermal alteration processes could then be confirmed by the presence of the M‐type tetrad effect in the REE‐patterns of the ferruginous sandstone. The non‐chondritic ratio of Nb/Ta, Zr/Hf and Y/Ho in the studied sandstone may be attributed to the tetrad effect. The Ce and Eu anomaly with unusual REE‐patterns was represented by the presence of conjugated M‐W tetrad effects, indicating either the dual effect of hydrothermal solutions or groundwater with seawater. The results clarify that the tetrad‐effects could be used as evidence for the environment of deposition and as an indication for gold mineralization.

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Section: Genesis Of Tetrad Effectsmentioning

confidence: 92%

Mineralogy and Geochemistry of Uraniferous Sandstones in Fault Zone, Wadi El Sahu Area, Southwestern Sinai, Egypt: Implications for Provenance, Weathering and Tectonic Setting

Sallam

Mira

Tohamy

et al. 2021

Acta Geologica Sinica (Eng)

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“…(YG, pink granites) [19,20]. The Arabian Nubian Shield rep East Africa orogen, formed during the closing of the Mozamb of East and West Gondwana [9,21,22]. Although granitic roc the relative abundance of younger granites to older granites i to 1:1 in the north of the Eastern Desert and 12:1 in the Si commercial granitic rocks were collected from various distr ries; Figure 1).…”

Section: Radiation Shielding Capacitymentioning

confidence: 99%

“…These rocks break into pieces over time under environmental conditions and spread across the environment. Uranium, thorium and potassium concentrations are mostly higher in the granitic rocks, granitic pegmatites and syenites, and are closely linked to mineralogical composition and petrographic features [ 8 , 9 , 10 , 11 ]. In general, felsic igneous rocks have greater levels than sedimentary rocks.…”

Section: Introductionmentioning

confidence: 99%

“…Enrichment of some elements such as Rb, Nb, Ta, U, Th, Zr, K and REEs is related to protracted fractional crystallization of the magma toward felsic rocks. Therefore, the previous elements’ abundance increases with increasing alkalinity (K 2 O + Na 2 O) [ 9 ]. In addition, felsic magmatic rocks require a high SiO 2 content; thus, felsic rocks can be viewed as crust-derived rocks.…”

Section: Introductionmentioning

confidence: 99%

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Radiological Hazard Evaluation of Some Egyptian Magmatic Rocks Used as Ornamental Stone: Petrography and Natural Radioactivity

et al. 2021

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Magmatic rocks represent one of the most significant rocks due to their abundance, durability and appearance; they can be used as ornamental stones in the construction of dwellings. The current study is concerned with the detailed petrography and natural radioactivity of seven magmatic rocks. All are commercial granitic rocks and are identified as black Aswan, Nero Aswan, white Halayeb, Karnak, Verdi, red Hurghada and red Aswan. Their respective mineralogical compositions are classified as porpheritic granodiorite, granodiorite, tonalite, monzogranite, syenogranite, monzogranite and syenogranite. A total of nineteen samples were prepared from these seven rock types in order to assess their suitability as ornamental stones. Concentrations of 226Ra, 232Th and 40K radionuclides were measured using NaI (Tl) scintillation gamma-ray spectrometry. Among the studied magmatic rocks, white Halayeb had the lowest average values of 226Ra (15.7 Bq/kg), 232Th (4.71 Bq/kg) and 40K (~292 Bq/kg), all below the UNSCEAR reported average world values or recommended reference limits. In contrast, the other granitic rocks have higher values than the recommended limit. Except for the absorbed dose rate, other radiological hazard parameters including radium equivalent activity, annual effective dose equivalent, external, and internal hazard indices reflect that the White Halyeb rocks are favorable for use as ornamental stone in the construction of luxurious and high-demand residential buildings.

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“…The major elements re ect the chemical composition and relative content of the minerals that make up the stones. In addition, the characteristics of the major elements show the overall properties of the rock [21]. The data results for the major elements were given in Table 1.…”

Section: Chemical Element Characterizationmentioning

confidence: 99%

Provenance Identification of the Inkslab Unearthed from Liangfu Gao’s Grave of the Song Dynasty (960-1279 CE) in Chengdu, Sichuan, China

Wang¹,

Gong²,

Shi-ming³

et al. 2020

Preprint

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In order to infer the provenance of ancient inkslab excavated from Liangfu Gao’s Grave of the Song dynasty (960-1279 CE) in Chengdu, a multi-analytical approach, including polarizing microscope, scanning electron microscope (SEM), X-ray powder diffraction (XRD), energy dispersive spectroscopy (EDS), X-ray fluorescence (XRF), inductively coupled plasma-atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS) was used for the complete characterization of the ancient inkslab and the collected sample materials of this inkslab. The comparison of the results about mineral structure, major, trace and rare earth elements (REE) suggested that this unearthed inkslab of Song dynasty was Pu inkslab, which was famous in Pujiang County of Chengdu, and conjectured that its particular structure made it show the good inking performance. This work provided a reliable basis for the study of the historical and cultural inheritance of the Gao family, providing more direct evidence for the produce and development of the inkslab in the Song Dynasty.

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Petrology, geochemistry, radioactivity, and M–W type rare earth element tetrads of El Sela altered granites, south eastern desert, Egypt

Cited by 26 publications

References 60 publications

Mineralogy and Geochemistry of Uraniferous Sandstones in Fault Zone, Wadi El Sahu Area, Southwestern Sinai, Egypt: Implications for Provenance, Weathering and Tectonic Setting

Mineralogy and Geochemistry of Uraniferous Sandstones in Fault Zone, Wadi El Sahu Area, Southwestern Sinai, Egypt: Implications for Provenance, Weathering and Tectonic Setting

Radiological Hazard Evaluation of Some Egyptian Magmatic Rocks Used as Ornamental Stone: Petrography and Natural Radioactivity

Provenance Identification of the Inkslab Unearthed from Liangfu Gao’s Grave of the Song Dynasty (960-1279 CE) in Chengdu, Sichuan, China

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