Abstract
The A-type granites are an important component of the Earth's continental crust and play a significant role in understanding crustal evolution and tectonic processes. This study presents a comprehensive assessment of A-type granites from Ataitir El Dehami granites (ADG) that located at the north-western part of Wadi Seih area in South Sinai, using geochemistry, zircon geochemistry, and geochronology characteristics. The geochemical analysis reveals that ADG are characterized by high silica content, relatively high FeO*, and high alkali concentration consistent with the A-type granites that derived from the melting of tonalite sources. Zircons from Ataitir El Dehami granites have high REE contents with Ce enrichment and depletion of Eu, which, together with the high U/Yb ratios, suggest that the studied granites were generated from melting of continental crust rocks. Zircon U-Pb geochronological data indicates that the granite emplacement occurred around 575 to 603 Ma throughout continuous exhumation pulses. The isotopic analyses also indicate that the presence of inherited zircon grains (735± 9Ma). The present data suggest that the studied granites were formed in a post-collisional setting, and represent the transition stage from convergence to extension that occurred at 600 Ma.
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