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Abu Rusheid lamprophyre dikes, South Eastern Desert, Egypt: as physical-chemical traps for REEs, Zn, Y, U, Cu, W, and Ag

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Abstract

Five lamprophyre dikes (L1-L5) intruded Abu Rusheid rocks (cataclastics and monzogranite) in the South Eastern Desert of Egypt along shear zones with NNW-SSE and E-W. The two sets of dikes differ in age, mineralization, and geochemical aspect. The NNW-SSE trending dikes (L1 and L2) are polymineralized and dislocate the E-W (L3, L4, and L5) trending dikes. These dikes underwent multistage of hydrothermal processes (ferrugination, fluoritization, kaolinitization, and calcification). They are characterized by common box works (physical trap) filled by incoming mineralization, and their feldspars and micas are relatively altered to clay minerals (chemical trap). From the mineralogical point of view, the cataclastic rocks are rich in base metals (pyrite, sphalerite, molybdenite, chalcopyrite, and galena), radioactive minerals (thorite, uranophane, kasolite, uranothorite), and accessories phases (zircon, xenotime, cassiterite, molybdenite, copper, columbite, and fluorite). L1 and L2 lamprophyre dikes contain U minerals (uranophane, kasolite, autunite, and torbernite), Mn-franklinite, woodruffite, xenotime, fluorite, silver, copper, and scheelite. L3 contains Zn and U minerals, whereas L4 and L5 contain Zn minerals only. The source magma producing lamprophyre dikes (L1 to L4) are peralkaline to alkaline, whereas L5 lamprophyres are mainly calc-alkaline in character; they were generated from the mantle and had formed in a post-collision tectonic setting with extensive Ti-rich metasomatism. The average ΣREE content in (L1 and L2) lamprophyres is 8006 ppm. REE patterns display clear concave upward pattern of W-type tetrad effect in the REE pattern accompanied by enrichment of the HREE over the LREE and marked negative Eu anomaly due to secondary mobilization of REEs.

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Acknowledgments

The authors appreciate the contribution from all members of Abu Rusheid project at NMA, Egypt. This work was financially supported by the Japan Society for the Promotion of Science during the first author's fellowship. The authors would like to express appreciation to Mr. Shinkawa at Mineral Resources Department, Kyushu University, Japan for all assistance during lab. Analyses.

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Authors and Affiliations

  1. Nuclear Materials Authority, Cairo, Egypt

    Mohamed El-Ahmady Ibrahim & Gehad Mohamed Saleh

  2. Faculty of Engineering, Kyushu University, Fukuoka, Japan

    Koichiro Watanabe & Waleed Saad Ibrahim

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  1. Mohamed El-Ahmady Ibrahim
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  2. Koichiro Watanabe
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  3. Gehad Mohamed Saleh
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  4. Waleed Saad Ibrahim
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Correspondence to Mohamed El-Ahmady Ibrahim.

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Ibrahim, M.EA., Watanabe, K., Saleh, G.M. et al. Abu Rusheid lamprophyre dikes, South Eastern Desert, Egypt: as physical-chemical traps for REEs, Zn, Y, U, Cu, W, and Ag. Arab J Geosci 8, 9261–9270 (2015). https://doi.org/10.1007/s12517-015-1882-8

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  • DOI: https://doi.org/10.1007/s12517-015-1882-8

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