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<p>The Neoproterozoic terrains of the Eastern Desert of Egypt are dominated by granitoid intrusions of varying ages and tectonic regimes. The Enhanced Thematic Mapper Plus (ETM +) data, field work, geochemistry, and petrography have all been integrated into this study to enable lithological discrimination of Neoproterozoic granitic varieties in Egypt’s Central Eastern Desert. Four granitic plutons along Qift-Quseir road namely; Abu Ziran, Fawakhir, Um Had, and Um Effin, were investigated. False color band composition (7, 5, 3) in RGB and principle component analysis (PC5, PC1, PC4) displayed in RGB were utilized. The processed ETM<sup>+</sup> images of Abu Ziran granites show different granitic phases forming the western, eastern and northern borders of the pluton. Two phases of granitic intrusions were discriminated in the Fawakhir pluton while Umm Had pluton have discriminated one granitic phase. In Umm Effin area, the granitic mass is easily distinguished and it has a homogenous elliptical shape composed of monzogranite. In terms of tectonic setting, Abu Ziran and Fawakhir samples are mostly plotted in volcanic arc granite (VAG) while Umm Had samples are mostly plotted in within-plate granite (WPG). Umm Effin samples are plotted on the borders through VAG and WPG. The magma sources of the granitic rocks of Abu Ziran and Fawakhir have generally magnesian affinity, while those of Umm Had and Umm Effein have ferroan characteristics. Generally, the four granitic plutons follow the alkalic calcic to calc- alkalic trends. Geochemical characteristics reveal that the studied granitic samples of the four selected areas lie in syn-collision granites (Syn Col G) and volcanic arc granites (VAG) fields. Umm Had and Umm Effin granites are displaying the largest degrees of fractionation between light and heavy rare earth elements, Generally, the spectral identifications and the geochemical classification agree fairly well. New lithological maps are produced with highly precise spatial resolutions. The current study is considered one of the latest methodologies (remote sensing techniques) used in geological research. This study explores the use of various tools for rock mapping and differentiation aiming to minimize the need of multiple field trips.</p>

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Geochemical and spectral signatures of neoproterozoic granitoid phases, Central Eastern Desert, Egypt

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  • 发表日期：

    2025年3月5日

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  • N. I. Abd El Ghaffar

摘要

The Neoproterozoic terrains of the Eastern Desert of Egypt are dominated by granitoid intrusions of varying ages and tectonic regimes. The Enhanced Thematic Mapper Plus (ETM +) data, field work, geochemistry, and petrography have all been integrated into this study to enable lithological discrimination of Neoproterozoic granitic varieties in Egypt’s Central Eastern Desert. Four granitic plutons along Qift-Quseir road namely; Abu Ziran, Fawakhir, Um Had, and Um Effin, were investigated. False color band composition (7, 5, 3) in RGB and principle component analysis (PC5, PC1, PC4) displayed in RGB were utilized. The processed ETM+ images of Abu Ziran granites show different granitic phases forming the western, eastern and northern borders of the pluton. Two phases of granitic intrusions were discriminated in the Fawakhir pluton while Umm Had pluton have discriminated one granitic phase. In Umm Effin area, the granitic mass is easily distinguished and it has a homogenous elliptical shape composed of monzogranite. In terms of tectonic setting, Abu Ziran and Fawakhir samples are mostly plotted in volcanic arc granite (VAG) while Umm Had samples are mostly plotted in within-plate granite (WPG). Umm Effin samples are plotted on the borders through VAG and WPG. The magma sources of the granitic rocks of Abu Ziran and Fawakhir have generally magnesian affinity, while those of Umm Had and Umm Effein have ferroan characteristics. Generally, the four granitic plutons follow the alkalic calcic to calc- alkalic trends. Geochemical characteristics reveal that the studied granitic samples of the four selected areas lie in syn-collision granites (Syn Col G) and volcanic arc granites (VAG) fields. Umm Had and Umm Effin granites are displaying the largest degrees of fractionation between light and heavy rare earth elements, Generally, the spectral identifications and the geochemical classification agree fairly well. New lithological maps are produced with highly precise spatial resolutions. The current study is considered one of the latest methodologies (remote sensing techniques) used in geological research. This study explores the use of various tools for rock mapping and differentiation aiming to minimize the need of multiple field trips.