Mineralogical, geochemical and Sr-Nd isotopes characteristics of fluorite-bearing granites in the Northern Arabian-Nubian Shield, Egypt: Constraints on petrogenesis and evolution of their associated rare metal mineralization

Assessment of magmatic versus post-magmatic processes in the Mueilha rare-metal granite, Eastern Desert of Egypt, Arabian-Nubian Shield

“…A number of potential sources and models of formation have been proposed for the A-type rocks of the Eastern Desert of Egypt (e.g. Sami et al 2017Sami et al , 2018Heikal et al, 2019;Abuamarah et al, 2019. The large differences in major and trace element concentrations and isotope ratios among various A-type granitic rocks in the Eastern Desert of Egypt strongly suggest that a variety of processes and sources were involved in their genesis (Farahat et al, 2007;Ali et al, 2012).…”

“…4k), with smooth and continuously correlated variations in Mn/(Mn+Fe) and Ta/(Ta+Nb), surrounded by a discrete mantle with modestly elevated Ta. Such zoning could conceivably reflect either J o u r n a l P r e -p r o o f Journal Pre-proof disequilibrium growth (with delivery of Nb and Ta to the growing crystal limited by sluggish diffusion in the melt) or equilibrium growth (with partitioning controlled by changes in equilibrium conditions and residual melt composition during magmatic fractionation) (Sami et al, 2017). In either case, the trend of correlated increasing Nb/(Nb+Ta) and Mn/(Mn+Fe) seen in the core of the Mueilha columbite is commonly interpreted as a primary magmatic fractionation trend (e.g.…”

Tracking the transition from subduction‐related to post‐collisional magmatism in the north Arabian–Nubian Shield: A case study from the Homrit Waggat area of the Eastern Desert of Egypt

“…Pre-collisional and syn-orogenic calc-alkaline magmatism (650-620 Ma), characteristic of the subduction period of the north ANS, was succeeded by post-collisional magmatism (e.g., Jarrar, Manton, Stern, & Zachmann, 2008;Moussa, Stern, Manton, & Ali, 2008;Azer & El-Gharbawy, 2011;El Hadek, Mohamed, El Habaak, Bishara, & Ali, 2016;Sami et al, 2017;Azer, Gahlan, Asimow, & Al-Kahtany, 2019,Azer, Abdelfadil, & Ramadan, 2019Abdallah, Azer, & El Shammari, 2019) including high-K calc-alkaline and alkaline rocks.…”

“…Previous studies on the postcollisional rocks of the Eastern Desert have suggested a wide variety of geochemical characteristics and tectonic regimes, with the result that the origin and geotectonic evolution of these rocks remain unclear. Furthermore, the association of high concentrations of the rare earth elements (REE) and other economic trace metals with post-collisional granitoids in the Eastern Desert of Egypt has drawn considerable attention to mapping and characterizing these deposits (e.g., Abuamarah, Azer, Asimow, Grefat, & Mubarak, 2019;El Hadek et al, 2016;Sami et al, 2017). Finally, the mineralogy of these rocks makes them the most important Egyptian sources of feldspars, which are used in industries such as ceramics and refractories.…”

Geochemical fingerprinting of Maastrichtian oil shales from the Central Eastern Desert, Egypt: Implications for provenance, tectonic setting, and source area weathering

“…The island arc rocks in the Central Eastern Desert of Egypt form a part of the Arabian Nubian Shield and resulted from the global‐scale thermo‐tectonic event of the Pan‐African orogeny between 900 and 550 Ma (Fritz et al, ; Sami et al, ). The formation and stabilization of continental island arc rocks in the Central Eastern Desert of Egypt passed through different thermo‐tectonic events including subduction, collision between East and West Gondwana, thickening, tectonic escape, delamination, extension, and strike‐slip faulting (Ali et al, ; Johnson et al, ).…”