Unraveling the Genesis of Highly Fractionated Rare-Metal Granites in the Nubian Shield via the Rare-Earth Elements Tetrad Effect, Sr-Nd and Mineral

Date

2022-09-01

Author

Sami, Mabrouk
Monsef, Mohamed Abd El
Abart, Rainer
Toksoy Köksal, Fatma
Abdelfadil, Khaled M.

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The rare-metal granites of the Nubian Shield are commonly associated with Nb-Ta and Sn mineralization. The magmatic and hydrothermal evolution of these granites and their relation to the Nb-Ta and Sn mineralization need further investigations. This study reports new mineral chemistry, whole rock geochemical, and Sr-Nd isotopic data for the Abu Dabbab granites in the Central Eastern Desert of Egypt to provide new insights into the formation mechanisms of the granites and their associated rare-metal mineralization. The granites consist mainly of albite, orthoclase, quartz, and Li-phengite, with accessory minerals including cassiterite, columbite, tantalite, wodginite, and Hf-zircon. Geochemically, they are peraluminous with high SiO2, alkalis, Rb, Nb, Ta, Sn, F, and low contents of MgO, CaO, and P2O5. The granites are characterized by distinct rare-earth element tetrad effects (TE1,3 = 1.8-2.5), with strongly negative Eu anomalies and are extremely depleted in Ba, Sr, P, and Ti. These features imply that they are typical muscovite peraluminous highly evolved granites. Isotopically, they display positive epsilon Nd(t) values (+1.11 to +8.32) and two-stage Nd depleted model ages (tDM2) between 0.68 and 1.13 Ga, suggesting a juvenile magma source of the Neoproterozoic age. The Abu Dabbab granites could be formed by dehydration melting of muscovite-rich crustal materials followed by extensive fractional crystallization with a significant role of magmatic-hydrothermal fluids during the transitional orogenic stage of the Nubian Shield.

Subject Keywords

tetrad effect, Sr-Nd isotopes, rare-metal granites, magmatic-hydrothermal fluids, Nb-Ta-Sn mineralization, Abu Dabbab, A-TYPE GRANITES, GEOCHEMICAL CONSTRAINTS, MAGMATIC FRACTIONATION, PERALUMINOUS GRANITES, ELECTRON-MICROPROBE, TOPAZ-BEARING, NANLING RANGE, ORE DISTRICT, TA, CHINA

URI

https://hdl.handle.net/11511/100065

Journal

ACS EARTH AND SPACE CHEMISTRY

DOI

https://doi.org/10.1021/acsearthspacechem.2c00125

Collections

Department of Geological Engineering, Article

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Citation Formats

M. Sami, M. A. E. Monsef, R. Abart, F. Toksoy Köksal, and K. M. Abdelfadil, “Unraveling the Genesis of Highly Fractionated Rare-Metal Granites in the Nubian Shield via the Rare-Earth Elements Tetrad Effect, Sr-Nd and Mineral,” ACS EARTH AND SPACE CHEMISTRY, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/100065.