Mineral chemistry aspects of U-, Th-, REE-, Cu-bearing minerals at El-Regeita shear zone, South Central Sinai, Egypt

Gawad, Ahmed E. Abdel; Ghoneim, Mohamed M.; El-Taher, Atef; Ramadan, A. A.

doi:10.1007/s12517-021-07801-0

Cited by 13 publications

(2 citation statements)

References 27 publications

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“…They were of syngenetic origin during the emplacement of the alkali feldspar granite. The total oxide content of the analyzed uranothorite and thorite from alkali feldspar granite in the study area is approximately close to ~90 wt% (Tables 2 and 3), which could be related to the hydration processes and/or extensive metamictization [45,46]. Some thorite grains are spread in hematite (Figure 9b,e), which could indicate an extensive alteration.…”

Section: Insights Into Rare Metals Mineralizationmentioning

confidence: 82%

Petrogenesis and Geodynamic Evolution of A-Type Granite Bearing Rare Metals Mineralization in Egypt: Insights from Geochemistry and Mineral Chemistry

Ghoneim,

Abdel Gawad,

El-Dokouny

et al. 2024

Minerals

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During the Late Precambrian, the North Eastern Desert of Egypt underwent significant crustal evolution in a tectonic environment characterized by strong extension. The Neoproterozoic alkali feldspar granite found in the Homret El Gergab area is a part of the Arabian Nubian Shield and hosts significant rare metal mineralization, including thorite, uranothorite, columbite, zircon, monazite, and xenotime, as well as pyrite, rutile, and ilmenite. The geochemical characteristics of the investigated granite reveal highly fractionated peraluminous, calc–alkaline affinity, A-type granite, and post-collision geochemical signatures, which are emplaced under an extensional regime of within-plate environments. It has elevated concentrations of Rb, Zr, Ba, Y, Nb, Th, and U. The zircon saturation temperature ranges from 753 °C to 766 °C. The formation of alkali feldspar rare metal granite was affected by extreme fractionation and fluid interactions at shallow crustal levels. The continental crust underwent extension, causing the mantle and crust to rise, stretch, and become thinner. This process allows basaltic magma from the mantle to be injected into the continental crust. Heat and volatiles were transferred from these basaltic bodies to the lower continental crust. This process enriched and partially melted the materials in the lower crust. The intrusion of basaltic magma from the mantle into the lower crust led to the formation of A-type granite.

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Section: Insights Into Rare Metals Mineralizationmentioning

confidence: 82%

Petrogenesis and Geodynamic Evolution of A-Type Granite Bearing Rare Metals Mineralization in Egypt: Insights from Geochemistry and Mineral Chemistry

Ghoneim,

Abdel Gawad,

El-Dokouny

et al. 2024

Minerals

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“…Radioactive mineral, especially monazite, mostly formed in medium-high grade metamorphism rocks [44][45][46][47]. Same condition also applies to Penyabung Diabase which did not has any radioactive mineral occurrence due to its characteristic of mafic mineral while uranium and thorium bearing minerals only deposited in intermediate to felsic rocks [48][49][50][51].…”

Section: Equivalent Thorium Measurement and Mappingmentioning

confidence: 88%

Uncovering the Distribution Zones of Uranium and Thorium in Bangka Island

Ngadenin,

Fauzi,

Syaeful

et al. 2023

Atom Indo.

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Radioactive minerals, especially containing uranium and thorium, can be used as a core element of nuclear fuel. Bangka Island is located in The Southeast Asian Tin Belt where it has a large uranium and thorium potential. The purpose of this study is to delineate distribution zone of uranium and thorium in Bangka Island. The study methods consist of radiometric measurement and mapping, petrographic analysis, and mineralogical analysis of pan concentrate samples. Based on radiometric measurement, positive anomaly value of equivalent uranium (eU) is ranging from 5-15 ppm while of equivalent thorium (eTh) is ranging from 45-75 ppm. The result of petrographic analysis from several outcrops of Klabat Granite indicated that there are monazites found in several samples of Mangkol Granite and of Bebuluh Granite. Radioactive mineral indication also can be identified as pleochroic halo within biotite in samples of Pelangas Granite and Menumbing Granite. Based on the result of mineralogical analysis of pan concentrate samples, it was identified that monazites can be found in all samples. Monazites constitute the percentages ranging from 2.82-10.66 %. Zircon also can be identified with percentages ranging from 9.13-76.75 % while ilmenite and magnetite minerals have average percentages of 24.09 % and 5.97 %, respectively. Favorable zones can be delineated in outcrops of Klabat Granite, Ranggam Formation and alluvial deposits in northern, northwestern, northeastern, central, and southeastern parts of Bangka Island. The occurrences of monazites in those lithological units are the main factors of high radioactivity in Bangka Island. Based on petrographic and mineralogical composition, those granite bodies which are correlated with Klabat Granite are mostly associated with ilmenite series with S-Type granitic rocks.

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Environmental impact assessment of granites bearing rare metals mineralization utilizing airborne gamma-ray spectrometric data, Egypt

Abdel Gawad,

Hammam,

Abd El Rahman

et al. 2024

J Radioanal Nucl Chem

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Mineral chemistry aspects of U-, Th-, REE-, Cu-bearing minerals at El-Regeita shear zone, South Central Sinai, Egypt

Cited by 13 publications

References 27 publications

Petrogenesis and Geodynamic Evolution of A-Type Granite Bearing Rare Metals Mineralization in Egypt: Insights from Geochemistry and Mineral Chemistry

Petrogenesis and Geodynamic Evolution of A-Type Granite Bearing Rare Metals Mineralization in Egypt: Insights from Geochemistry and Mineral Chemistry

Uncovering the Distribution Zones of Uranium and Thorium in Bangka Island

Environmental impact assessment of granites bearing rare metals mineralization utilizing airborne gamma-ray spectrometric data, Egypt

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