Physico-chemical conditions controlling the radionuclides mobilisation in various granitic environments

Mezayen, Ahmed M. El; Ibrahim, Eman M.; El-Feky, Mohamed G.; Omar, Sayed M.; El-Shabasy, Ahmed M.; Taalab, Sherif A.

doi:10.1080/03067319.2020.1729758

Cited by 12 publications

(6 citation statements)

References 29 publications

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“…Rezaei Azizi et al ( 2017) pointed out the importance of trace elements such as Ta, Zr, Y, Nb, and REEs in various rock types and environments for deposit geochemistry and earth evolution. Most trace elements may be mobilised, and new mineral phases may form when minerals dissolve during hydrothermal alteration (El-Mezayen et al, 2015). Trace elements are enriched in Cu, Zn, U, Sr, Cr, Rb, Nb, Cs, Sc, As, Bi, In, Se, and Tl, while decreased in Ni, Zr, Y, and Th in the highly desilicified episyenite samples (Figure 9B).…”

Section: Depletion Enrichment Of Major Oxides Trace and (Ree S ) In T...mentioning

confidence: 99%

“…These granitic rocks, which have undergone different types of alteration, possess unique mineral associations that are of interest from a geological perspective and have important implications in practical applications. These include chloritization, muscovitization, hematitization, sericitization, kaolinization, albitization, silicification, and saussuritization (El Mezayen et al, 2022). Each alteration introduces specific minerals and elements, which can alter the granite's properties, including its density and capacity for radiation attenuation (Zakaly et al, 2022;2023).…”

Section: Introductionmentioning

confidence: 99%

“…Each alteration introduces specific minerals and elements, which can alter the granite's properties, including its density and capacity for radiation attenuation (Zakaly et al, 2022;2023). Moreover, the presence of mineral deposits, particularly those containing precious and base metals, is often associated with the hydrothermal alteration processes in these acidic rocks (El-Mezayen et al, 2015;Tarrah, 2016;Watanabe et al, 2018;Abdel-Rahman et al, 2022;Awad et al, 2022b;Taalab et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

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Notable changes in geochemical and mineralogical characteristics of different phases of episyenitization: insights on the radioactive and shielding of the late phase

Taalab,

Zakaly,

Ivanov

et al. 2023

Front. Earth Sci.

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Kab Amiri granites are submitted to post-magmatic hydrothermal solutions through fracture and faults, causing several alteration processes. The most common processes are episyenitization, saussuritization, hematitization, sericitization, kaolinization, albitization, chloritization, silicification, and muscovitization. Kab Amiri granites are vuggy, with the vugs partially to completely refilled with new constituents. The least episyenitized granites have elevated amounts of Fe, P, Zr, Ni, U, Th, Ba, Y, Hf, Nb, and As, which are correlated with their mobilization from biotite, k-feldspar, plagioclase and metamict zircon. These elemental changes are related the partial albitization, muscovitization, desilicification and chloritizatiom, which lead to the mobilization of these elements and forming of specific mineral association in the least altered granites such as autonite, tripiolite, columbite, Zircon and galena. On the second stage, granites were subjected to intense alteration processes by mineralizing fluids, causing wholly muscovitization of biotite and feldspar, albitization of plagioclase, carbonitization and apatitization. Many elements were mobilized from these altered minerals, including Ti, Al, Mn, Mg, Ca, Na, K, Mo, Cu, Pb, Zn, Ag, Co, Sr, V, Cr, Sn, Rb, Ta, Li, Sc, W, S, In, and Tl, leading to definite mineralization as kaslite, monazite, xenotime, polycrase and apatite. The mineralizing fluids in the least and highly episyenitized granites are incorporated in some ore minerals like uranophane, fergusonite, bazzite and garnet. Notably, the presence of elements such as U, Th, and other heavy metals in Kab Amiri granites highlights the potential for these rocks in radiation shielding applications. The unique combination of elements and minerals resulting from the alteration processes can be leveraged for developing new materials or enhancing existing materials used in radiation shielding.

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Section: Depletion Enrichment Of Major Oxides Trace and (Ree S ) In T...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Notable changes in geochemical and mineralogical characteristics of different phases of episyenitization: insights on the radioactive and shielding of the late phase

Taalab,

Zakaly,

Ivanov

et al. 2023

Front. Earth Sci.

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“…The groups include very high and moderate concentrations, which may indicate the presence of more than one pulse of mineralization (Figure 4a-c). A negative correlation of eU and eTh with K may be related to the alteration processes of feldspars pegmatites leading to uranium leaching and thorium adsorption of thorium on the resulting clay minerals leading to the deficiency in U and Th [42,43], (Figure 4d,e). eTh/eU-eTh/K relation manifests in the studied rock samples lying in the moderate sector between fixed and leached zones, indicating partial uranium and thorium mobilization closer to the fixed zone, suggesting they are hazardous if used as construction or decorative materials (Figure 4f).…”

Section: Radioelement Distributionmentioning

confidence: 99%

“…Radioactive equilibrium in the study area can be estimated by the equilibrium factor (P), which was suggested by Reference [45] and applied by [41][42][43]46]. If the P-factor is ≥1, uranium is being added or removed.…”

Section: Radioactive Equilibriummentioning

confidence: 99%

Natural Radionuclide Levels and Radiological Hazards of Khour Abalea Mineralized Pegmatites, Southeastern Desert, Egypt

et al. 2022

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Arranged from oldest to youngest, the main granitic rock units exposed in Khour Abalea are metagabbros, cataclastic rocks, ophiolitic melange, granitic rocks, pegmatite and lamprophyre dykes. The presence of radioactivity associated with the heavy bearing minerals in construction materials—like granite—increased interest in the extraction process. As it turns out, granitic rocks play an important economic part in the examination of an area’s surroundings. The radionuclide content is measured by using an NaI (Tl)-detector. In the mineralized pegmatites, U (326 to 2667 ppm), Th (562 to 4010 ppm), RaeU (495 to 1544 ppm) and K (1.38 to 9.12%) ranged considerably with an average of 1700 ppm, 2881.86 ppm, 1171.82 ppm and 5.04%, respectively. Relationships among radioelements clarify that radioactive mineralization in the studied pegmatites is magmatic and hydrothermal. A positive equilibrium condition confirms uranium addition to the studied rocks. This study determined 226Ra, 232Th and 40K activity concentrations in pegmatites samples and assessed the radiological risks associated with these rocks. The activity concentrations of 226Ra (13,176 ± 4394 Bq kg−1), 232Th (11,883 ± 5644 Bq kg−1) and 40K (1573 ± 607 Bq kg−1) in pegmatites samples (P) are greater than the global average. The high activity of the mineralized pegmatite is mainly attributed to the presence of uranium mineral (autunite), uranophane, kasolite and carnotite, thorium minerals (thorite, thorianite and uranothorite) as well as accessories minerals—such as zircon and monazite. To assess the dangerous effects of pegmatites in the studied area, various radiological hazard factors (external, internal hazard indices, radium equivalent activity and annual effective dose) are estimated. The investigated samples almost surpassed the recommended allowable thresholds for all of the environmental factors.

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Introduction

Sukanya

Joseph

2023

Environmental Radon

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Physico-chemical conditions controlling the radionuclides mobilisation in various granitic environments

Cited by 12 publications

References 29 publications

Notable changes in geochemical and mineralogical characteristics of different phases of episyenitization: insights on the radioactive and shielding of the late phase

Notable changes in geochemical and mineralogical characteristics of different phases of episyenitization: insights on the radioactive and shielding of the late phase

Natural Radionuclide Levels and Radiological Hazards of Khour Abalea Mineralized Pegmatites, Southeastern Desert, Egypt

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