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Petrogenesis and evolution of the Nuweibi rare-metal granite, Central Eastern Desert, Egypt

  • Ashraf Emam
  • Basem Zoheir
  • Abdelhady Mohammed Radwan
  • Bernd Lehmann
  • Rongqing Zhang
  • Sherif Fawzy
  • Nicole Nolte
ArabGU2016
  • 75 Downloads
Part of the following topical collections:
  1. Current Advances in Geology of North Africa

Abstract

The Nuweibi rare-metal granite in the Central Eastern Desert of Egypt is highly evolved fine- to medium-grained leucogranite affected by pervasive albitization and greisenization. The intrusion holds an important tin–tantalum resource in the Egyptian Eastern Desert. Columbite–tantalite and cassiterite disseminations occur within the granite body, while the quartz ± feldspar veins cutting across the Nuweibi granite host only cassiterite disseminations. Microscopically, quartz and alkali-feldspar are the essential mineral constituents of Nuweibi granite, with minor mica (muscovite + rare biotite), while cassiterite, columbite–tantalite, zircon, allanite, beryl, tourmaline, titanite, and fluorite are accessories. Whole-rock geochemistry and micoanalytical data together with laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS) dating of zircon and columbite have been used to constrain the evolution of the granite intrusion and associated mineralization. The Nuweibi granite is weakly peraluminous with extremely low MgO, CaO, TiO2, P2O5, Ba, and Sr contents and elevated Sn, Ta, Nb, and Rb contents. The REE patterns exhibit distinct tetrad effects, as well as negative Eu and Y anomalies. Also, the bulk rock Zr/Hf ratios are consistently < 10. The Nd isotopic system is disturbed and εNd values suggest a juvenile mantle and/or Neoproterozoic crustal source. The U–Pb system in zircon is disturbed and leaked continuously, while the U–Pb age of columbite is ~ 620 Ma. The geochemical and isotopic systematics of the Nuweibi intrusion reflect very advanced degree of fractionation combined with late magmatic fluid overprint which redistributed Sn and other mobile elements, while Ta still characterizes the igneous system.

Keywords

Nuweibi Rare-metal granite Isotopic dating Tin–tantalum 

Supplementary material

12517_2018_4051_MOESM1_ESM.xls (35 kb)
Table 3 U - Pb isotope data on zircon from Nuweibi (XLS 35 kb)
12517_2018_4051_MOESM2_ESM.xls (32 kb)
Table 4 U - Pb isotope data on columbite from Nuweibi (XLS 31 kb)
12517_2018_4051_MOESM3_ESM.xls (30 kb)
Table 5 Previous Sm-Nd studies from famous rare metal granite intrusions (XLS 30 kb)

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Ashraf Emam
    • 1
  • Basem Zoheir
    • 2
    • 3
  • Abdelhady Mohammed Radwan
    • 1
    • 4
  • Bernd Lehmann
    • 4
  • Rongqing Zhang
    • 5
  • Sherif Fawzy
    • 1
  • Nicole Nolte
    • 6
  1. 1.Department of Geology, Faculty of ScienceAswan UniversityAswanEgypt
  2. 2.Department of Geology, Faculty of ScienceBenha UniversityBenhaEgypt
  3. 3.Institute of GeosciencesKiel UniversityKielGermany
  4. 4.Mineral ResourcesTechnical University of ClausthalClausthal-ZellerfeldGermany
  5. 5.CAS Key Laboratory of Mineralogy and MetallogenyChinese Academy of SciencesGuangzhouChina
  6. 6.Geoscience Center Göttingen, Isotope GeologyGöttingenGermany

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