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Petrogenesis and Geochemical Implications of Neoproterozoic Gabal Ras Zeraib Granites, Central Eastern Desert, Egypt

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Abstract

The Gabal Ras Zarieb area, located west of Quseir City in Egypt’s Central Eastern Desert, is distinguished by two distinct granitic masses of monzogranite and alkali feldspar granite. This research looked at field relations, geochemistry, and petrographic analysis to define the petrogenesis of these granites. GRZ granites are intruded with sharp obvious contacts into the island arc metavolcanics and metavolcaniclastics. The geochemical results demonstrate that alkali feldspar granite varies considerably from monzogranite in terms of composition, display a rise in SiO2 and total alkalis, and a decrease in Al2O3, TiO2, FeOt, MgO, and CaO. In comparison to monzogranite, alkali feldspar granite contains a higher concentration of Rb, Y, Zr, and Nb, as well as U and Th. With the exception of three samples, the REE patterns indicate modestly positive Eu anomalies, Eu/Eu*(1.6–2.1) for monzogranite, while alkali feldspar granites exhibit substantially negative Eu anomalies, Eu/Eu*(0.1–0.15), showing plagioclase fractionation. The monzogranite is calc-alkaline, metaluminous to peraluminous, I-type granite, and post-collisional, whereas the alkali feldspar granite is metaluminous, post-collisional, and A-type affinity, suggesting a transitional tectonic setting. Moreover, the monzogranites are formed by partial melting followed by fractional crystallization. The alkali feldspar granite is created directly from residual magma by the process of fractionation.

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ACKNOWLEDGMENTS

The author is grateful to Prof. Ashraf Moharem, Nuclear Materials Authority for facilitating chemical analysis. Many thanks to Al-Azhar University’s Department of Geology for giving access to laboratories equipped with the appropriate equipment.

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This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Geology Department, Faculty of Science, Al-Azhar University, Nasr City, PO Box 11884, Cairo, Egypt

    Taher M. Shahin

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Taher Shahin: Conceptualization, Visualization, Methodology, Software, Validation, Writing Original draft preparation.

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Correspondence to Taher M. Shahin.

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Shahin, T.M. Petrogenesis and Geochemical Implications of Neoproterozoic Gabal Ras Zeraib Granites, Central Eastern Desert, Egypt. Dokl. Earth Sc. 512, 983–997 (2023). https://doi.org/10.1134/S1028334X23600421

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