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<p>The Wadi Queih area, Central Eastern Desert of Egypt, forms part of the northern Arabian–Nubian Shield and records a complex Neoproterozoic tectono-magmatic evolution related to the Pan-African orogeny. This study integrates detailed field mapping, petrography, Energy-dispersive X-ray (EDX), and whole-rock geochemistry to constrain the lithological evolution of the area and to assess the nature and controls of gold mineralization. The exposed rock units comprise island-arc metavolcanics, continental margin (Dokhan) volcanics, Hammamat molasse-type sediments, and post-collisional within-plate granites represented mainly by syenogranites and quartz–feldspar porphyries. Petrographic investigations indicate greenschist-facies metamorphism accompanied by widespread hydrothermal alteration. Geochemical data indicates sub-alkaline arc related affinities for metavolcanic rocks, whereas granitic intrusions display within-plate affinities consistent with post-collisional tectonic settings. Gold mineralization occurs as structurally controlled quartz veins and hydrothermal alteration zones associated with quartz–feldspar porphyry intrusions. Gold occurs both as free grains and in close association with sulfide minerals, particularly pyrite, within hydrothermally altered metavolcanic host rocks. Integrated structural, petrographic, and geochemical evidence suggests that mineralization developed as part of a deformation-related hydrothermal system comparable to orogenic gold deposits elsewhere in the Arabian–Nubian Shield.</p>

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Petrography, geochemistry, and tectono-metallogenic evolution of neoproterozoic rocks in the Wadi Queih area, Central Eastern Desert, Egypt: implications for orogenic gold mineralization

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Khaled El-Gameel,
  • Hassan Reda,
  • Hassan Eliwa

摘要

The Wadi Queih area, Central Eastern Desert of Egypt, forms part of the northern Arabian–Nubian Shield and records a complex Neoproterozoic tectono-magmatic evolution related to the Pan-African orogeny. This study integrates detailed field mapping, petrography, Energy-dispersive X-ray (EDX), and whole-rock geochemistry to constrain the lithological evolution of the area and to assess the nature and controls of gold mineralization. The exposed rock units comprise island-arc metavolcanics, continental margin (Dokhan) volcanics, Hammamat molasse-type sediments, and post-collisional within-plate granites represented mainly by syenogranites and quartz–feldspar porphyries. Petrographic investigations indicate greenschist-facies metamorphism accompanied by widespread hydrothermal alteration. Geochemical data indicates sub-alkaline arc related affinities for metavolcanic rocks, whereas granitic intrusions display within-plate affinities consistent with post-collisional tectonic settings. Gold mineralization occurs as structurally controlled quartz veins and hydrothermal alteration zones associated with quartz–feldspar porphyry intrusions. Gold occurs both as free grains and in close association with sulfide minerals, particularly pyrite, within hydrothermally altered metavolcanic host rocks. Integrated structural, petrographic, and geochemical evidence suggests that mineralization developed as part of a deformation-related hydrothermal system comparable to orogenic gold deposits elsewhere in the Arabian–Nubian Shield.