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Composition, age, and origin of the ~620 Ma Humr Akarim and Humrat Mukbid A-type granites: no evidence for pre-Neoproterozoic basement in the Eastern Desert, Egypt

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Abstract

The Humr Akarim and Humrat Mukbid plutons, in the central Eastern Desert of Egypt, are late Neoproterozoic post-collisional alkaline A-type granites. Humr Akarim and Humrat Mukbid plutonic rocks consist of subsolvus alkali granites and a subordinate roof facies of albite granite, which hosts greisen and Sn–Mo-mineralized quartz veins; textural and field evidence strongly suggest the presence of late magmatic F-rich fluids. The granites are Si-alkali rich, Mg–Ca–Ti poor with high Rb/Sr (20–123), and low K/Rb (27–65). They are enriched in high field strength elements (e.g., Nb, Ta, Zr, Y, U, Th) and heavy rare earth elements (La n /Yb n  = 0.27–0.95) and exhibit significant tetrad effects in REE patterns. These geochemical attributes indicate that granite trace element distribution was controlled by crystal fractionation as well as interaction with fluorine-rich magmatic fluids. U–Pb SHRIMP zircon dating indicates an age of ~630–620 Ma but with abundant evidence that zircons were affected by late corrosive fluids (e.g., discordance, high common Pb). εNd at 620 Ma ranges from +3.4 to +6.8 (mean = +5.0) for Humr Akarim granitic rocks and from +4.8 to +7.5 (mean = +5.8) for Humrat Mukbid granitic rocks. Some slightly older zircons (~740 Ma, 703 Ma) may have been inherited from older granites in the region. Our U–Pb zircon data and Nd isotope results indicate a juvenile magma source of Neoproterozoic age like that responsible for forming most other ANS crust and refute previous conclusions that pre-Neoproterozoic continental crust was involved in the generation of the studied granites.

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Acknowledgments

This work was supported by NSF-OISE grant #632220 to RJS and a post-doctoral fellowship from Curtin University in Perth, Australia to KAA. The SHRIMP II facility in Perth is operated jointly by Curtin University, the University of Western Australia and the Geological Survey of Western Australia, with support from the Australian Research Council. The authors would like to thank the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS) for performing the chemical and Nd isotope analyses. We are grateful to Ghaleb Jarrar, Jean-Paul Liégeois and editor Wolf-Christian Dullo for critical reviews that improved this manuscript. This is UTD Geosciences contribution number #1213 and TIGeR publication # 256. This is a JEBEL contribution.

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Authors and Affiliations

  1. Department of Mineral Resources and Rocks, Faculty of Earth Sciences, King Abdulaziz University, P.O. Box 80206, Jeddah, 21589, Kingdom of Saudi Arabia

    Kamal A. Ali & Abdel-Kader M. Moghazi

  2. Department of Geology, Faculty of Science, Alexandria University, Alexandria, Egypt

    Abdel-Kader M. Moghazi

  3. Geology Department, Faculty of Science, Beni Suef University, Beni Suef, 62517, Egypt

    Ayman E. Maurice

  4. Nuclear Material Authority, P.O. Box 530, El Maadi, Kattamyia, Egypt

    Sayed A. Omar & Ewais M. Moussa

  5. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, People’s Republic of China

    Qiang Wang

  6. Department of Applied Geology, Curtin University, Perth, WA, 6845, Australia

    Simon A. Wilde

  7. Geosciences Department, University of Texas at Dallas, 800 W Campbell Rd., Richardson, TX, 75080, USA

    Kamal A. Ali, William I. Manton & Robert J. Stern

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  1. Kamal A. Ali
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  2. Abdel-Kader M. Moghazi
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Correspondence to Kamal A. Ali.

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Ali, K.A., Moghazi, AK.M., Maurice, A.E. et al. Composition, age, and origin of the ~620 Ma Humr Akarim and Humrat Mukbid A-type granites: no evidence for pre-Neoproterozoic basement in the Eastern Desert, Egypt. Int J Earth Sci (Geol Rundsch) 101, 1705–1722 (2012). https://doi.org/10.1007/s00531-012-0759-2

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