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• W3091672087 abstract "Most earlier geochemical studies on Egyptian granites rely on the use of old conventional discrimination diagrams in deducing the tectonic settings of these rocks (e.g. Pearce et al. 1984; Harris et al. 1986). It is evidenced that these diagrams are so complicated and contradictory that their application is proved generally confusing. They allow more or less correct discrimination only between the island arc setting (orogenic) and intraplate setting (anorogenic). The data for collision-related granites do not form separate fields in these diagrams. Moreover, the geochemical signature of collision-related granites does not fit with the geodynamic environment in which they are thought to have formed, i.e. they plot in VAG and post-collisional fields instead of being in Syn-COLG field. This may be attributed to: (1) disturbance in the original values of some LIL elements in these rocks due to different degrees of magma contamination and later phases of alteration, (2) the close association of collisional and extensional settings in space and time, (3) blurry field boundaries, especially between the VAG and WPG fields, produced by differentiation. It is demonstrated that the weaknesses of trace element tectonic discrimination diagrams, especially employing Rb and similar LIL elements. However, the collision-related granites can be distinguished from that of volcanic-arc and intraplate settings by using schemes that use the immobile elements, particularly Zr and Nb. Based on a compiled data of previous geological, geochemical and geochronological studies of 73 granitic plutons from recorded and common occurrences in the Eastern Desert, Sinai and Western Desert, four main categories of granitic rocks have been identified, namely: (1) subduction-related granites, (2) collision-related granites, (3) A2-type intraplate granites and (4) A1-type intraplate granites. The subduction-related granites consist of three different granitic suites, namely diorite, granodiorite to tonalite and minor monzogranite. The magma of these rocks has tholeiitic and calc-alkaline affinity, formed from mantle wedge overlying a subducted slab in an immature island arc setting (around 700–660 Ma). The collision-related rocks, mainly monzogranite and syanogranite, were emplaced either in island arc setting or in active continental margin. The origin of these rocks is related to anatexis of the lower continental crust that marks the orogenic crustal thickening and the cratonization of the Arabian Nubian Shield (around 610–590 Ma). Due to tectonic change from oblique compression regime to extension regime, the subducted slab can break to form steeply inclined structures of shear extension, which ensure permeability for high-K calc-alkaline to shoshonite parent magma of the A2-type intraplate granites (between 590 and 540 Ma). Around 540 Ma, a group of A1-type intraplate granites was emplaced in intraoceanic system (oceanic islands) or near the divergent boundaries of lithospheric plates in cold intracontinental rifts resulted from the differentiation of alkali-basaltic magmas with minor crustal assimilation." @default.
• W3091672087 created "2020-10-08" @default.
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• W3091672087 date "2020-09-30" @default.
• W3091672087 modified "2023-09-27" @default.
• W3091672087 title "The Egyptian Granitoids: an up-to-date Synopsis" @default.
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• W3091672087 doi "https://doi.org/10.1007/978-3-030-49771-2_9" @default.
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