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Low-temperature alteration of uranium–thorium bearing minerals and its significance in neoformation of radioactive minerals in stream sediments of Wadi El-Reddah, North Eastern Desert, Egypt

  • O. A. Ebyan
  • H. A. Khamis
  • A. R. Baghdady
  • M. G. El-Feky
  • N. S. AbedEmail author
Original Article
  • 35 Downloads

Abstract

The stream sediments of Wadi El Reddah (North Eastern Desert, Egypt) are geochemically and mineralogically investigated. Their content of radioactive and other heavy minerals is mainly represented by thorite, uranothorite, zircon, monazite, xenotime, columbite, fergusonite, and unknown rare earth elements (REEs) bearing minerals as well as cassiterite. Special emphasis on REE content of thorite, uranothorite, zircon and xenotime has been done to correlate them with the increase of uranium contents in these sediments. The key evidence for the presence low-temperature alteration processes includes the presence of some zircon crystals as remnants after complete dissolution of the overgrowth zircon in severe acidic environment, the sulphur content, biogenic minerals, occurrence of unusual minerals as cassiterite pore filling in zircon, variation in the REEs content from the surrounding granites to the stream sediments and the abundance of monazite in the surrounding granites. Most minerals are partially and/or completely altered, which indicated by the pseudomorphism of zircon by xenotime, thorite, and uranothorite.

Keywords

Zircon Thorite Xenotime Radioactive minerals Low-temperature alteration Wadi El-Reddah 

Notes

Acknowledgements

Authors thank the Nuclear Materials Authority, Egypt for the facilities used in this work.

Compliance with ethical standards

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Copyright information

© Science Press and Institute of Geochemistry, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Geology Department, Faculty of ScienceAin Shams UniversityCairoEgypt
  2. 2.Nuclear Materials Authority (NMA)El-Maadi, CairoEgypt

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