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Genesis of Sulfide Mineralization, Atshan and Darhib Areas, South Eastern Desert of Egypt: Evidence of Fluid Pathway Effects Along Shear Zones

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Abstract

The studied sulfide mineralizations of Atshan and Darhib areas are related to the south Eastern Desert shear zones. They are hosted in talc- and tremolite-talc-rich rocks and also in meta-basaltic dykes and quartz-veins. The principal mineralization in Atshan includes sphalerite, pyrite, chalcopyrite, galena and pyrrhotite, whereas that in Darhib comprises chalcopyrite, sphalerite, pyrite, and galena with subordinate bornite and covellite. Darhib mineralization contains traces of altaite and electrum. Altaite has the highest Te concentrations suggesting crystallization under low fS2 and/or high fTe2 conditions, probably due to S budget consumption from the hydrothermal fluids in the late stage of deposition. Electrum has the highest Au contents with gold fineness value falling within the range of epithermal Au–Ag deposits. The dominance of recrystallized and replacement textures in the studied mineralizations suggests a secondary or post-depositional metamorphic overprint. The significant Cd contents in sphalerite from remobilized massive mineralizations hosted in tremolite-talc-rich rocks indicate crystallization at ~250–300 °C. Galena hosted in tremolite-talc-rich rocks is characterized by exceptionally high selenium and tellurium contents, indicating its generation from relatively Se–Te-enriched hydrothermal fluids. Pyrrhotite hosted in quartz-veins from Atshan was formed under lower sulfur activity (aS2) and oxygen fugacity (fO2). Covellite and bornite were formed due to chalcopyrite oxidation, revealing a role of supergene process. Shear zones, possibly produced during later thrust faulting, were acted as channel ways for hydrothermal mineralizing fluids that may have modified and/or precipitated the mineralization. Mineralizing fluids have probably resulted from dehydration during metamorphism and/or late-magmatic fluids from nearby granitic intrusions.

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source: Pan-African serpentinites [46, 47]; Fore-arc ophiolites from Eastern Desert [17, 42, 43]

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Acknowledgements

M.Z. Khedr would like to thank Shoji Arai and Tomo Morishita, Kanazawa University (Japan), for providing EPMA analytical facilities of silicate minerals during his post-doctor in Kanazawa, Japan. The authors are grateful to Ian Honsberger and one anonymous AJSE reviewer and subject editor M.N. Çağatay for their precious comments.

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Authors and Affiliations

  1. Department of Geology, Zagazig University, Zagazig, 44519, Egypt

    Abdel-Aal M. Abdel-Karim, Amr El-Awady & Waheed Elwan

  2. Department of Geology, Kafrelsheikh University, Kafrelsheikh, Egypt

    Mohamed Z. Khedr

  3. Nuclear Materials Authority, El Maadi, Cairo, Egypt

    Adel H. El-Afandy

  4. Department of Earth Sciences, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan

    Akihiro Tamura

  5. Geology Department, Faculty of Science, Minia University, El-Minia, 61519, Egypt

    Shehata Ali

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Abdel-Karim, AA.M., El-Awady, A., Khedr, M.Z. et al. Genesis of Sulfide Mineralization, Atshan and Darhib Areas, South Eastern Desert of Egypt: Evidence of Fluid Pathway Effects Along Shear Zones. Arab J Sci Eng 47, 641–665 (2022). https://doi.org/10.1007/s13369-021-05736-y

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