Geochronology and petrogenesis of the Cryogenian Sukari granite intrusion, Central Eastern Desert, Egypt: Inferences from whole rock geochemistry, zircon U-Pb-Hf isotopes and trace elements
Harhash, A., Kamal El Deen, A., Khalil, K., Moghazi, A. (2024). Geochronology and petrogenesis of the Cryogenian Sukari granite intrusion, Central Eastern Desert, Egypt: Inferences from whole rock geochemistry, zircon U-Pb-Hf isotopes and trace elements. EKB Journal Management System, 2(2), 69-89. doi: 10.21608/ajst.2024.288041.1031
Aya Fawzy Harhash; Ahmed Ali Kamal El Deen; Khalil Ishaq Khalil; Abdel-Kader Mohamed Moghazi. "Geochronology and petrogenesis of the Cryogenian Sukari granite intrusion, Central Eastern Desert, Egypt: Inferences from whole rock geochemistry, zircon U-Pb-Hf isotopes and trace elements". EKB Journal Management System, 2, 2, 2024, 69-89. doi: 10.21608/ajst.2024.288041.1031
Harhash, A., Kamal El Deen, A., Khalil, K., Moghazi, A. (2024). 'Geochronology and petrogenesis of the Cryogenian Sukari granite intrusion, Central Eastern Desert, Egypt: Inferences from whole rock geochemistry, zircon U-Pb-Hf isotopes and trace elements', EKB Journal Management System, 2(2), pp. 69-89. doi: 10.21608/ajst.2024.288041.1031
Harhash, A., Kamal El Deen, A., Khalil, K., Moghazi, A. Geochronology and petrogenesis of the Cryogenian Sukari granite intrusion, Central Eastern Desert, Egypt: Inferences from whole rock geochemistry, zircon U-Pb-Hf isotopes and trace elements. EKB Journal Management System, 2024; 2(2): 69-89. doi: 10.21608/ajst.2024.288041.1031

Geochronology and petrogenesis of the Cryogenian Sukari granite intrusion, Central Eastern Desert, Egypt: Inferences from whole rock geochemistry, zircon U-Pb-Hf isotopes and trace elements

Alexandria Journal of Science and Technology
Article 1, Volume 2, Issue 2 - Serial Number 4, December 2024, Pages 69-89    PDF (2.93 M)
Document Type: Research article
DOI: 10.21608/ajst.2024.288041.1031
Authors
Aya Fawzy Harhash* 1; Ahmed Ali Kamal El Deen2; Khalil Ishaq Khalil1; Abdel-Kader Mohamed Moghazi1
1Geology Department, Faculty of Science, Alexandria University
2Sukari Gold Mine Ltd
Abstract
The Sukari granite intrusion is a trondhjemite-granodiorite-granite suite in the Central Eastern Desert of Egypt. Its rocks are calc-alkaline and slightly metaluminous to peraluminous. On variation diagrams, general trends of decreasing Al2O3, TiO2, Fe2O3t, MgO, CaO, and Sr and increasing Th are observed. The REE patterns are slightly fractionated {(La/Yb)N = 1.89–2.24} with moderate negative Eu (Eu/Eu* = 0.33 – 0.58) anomalies. On primitive-mantle trace element diagrams, the granites are depleted in Nb, Ta, Sr, and Ti. These geochemical traits suggest that the Sukari granites were evolved by fractional crystallization of plagioclase and ferromagnesian minerals in a subduction-related tectonic environment. Zircons separated from the Sukari granites are characterized by HREE enrichment, positive Ce- and negative Eu- anomalies, and crystallization temperatures in the range of 606 - 819°C, which are typical of magmatic zircons. Zircon U–Pb-Hf analyses of the Sukari granite reveals an emplacement age of 676.5 ± 1.3 Ma, positive ɛHf(t) ( +10.7 to +16.2), single-stage Hf model age (TDM) of 608-838 Ma, and two-stage Hf model age (TDMc) of 574 - 920 Ma. The positive ɛHf(t) and the Hf-TDMc ages, which are close to the U–Pb crystallization ages, in addition to the absence of zircon inheritance indicate that the protolith of the Sukari granite was juvenile. A combined examination of the whole rock geochemistry and isotope signatures suggests that the parent magma of the Sukari granite was formed by partial melting of a depleted mantle source with lower crustal contribution in a subduction-related tectonic environment.
Keywords
Late Neoproterozoic; Arabian-Nubian Shield; Sukari granite; Zircon U–Pb–Hf isotopes; Geochemistry
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