Petrogenesis and Tectonic Evolution of Kab Amiri Ophiolites and Island-Arc Assemblages, Central Eastern Desert, Egypt: Petrological and Geochemical Constraints

The Kab Amiri area in the Central Eastern Desert (CED) of Egypt comprises ophiolitic rocks, island arc metasediments, and granitic rocks. This study deals with petrography geochemistry rocks to understand their petrogenesis geodynamic evolution CED belt. ophiolite is dismembered, comprising serpentinites metabasalt (spilite). Serpentinites have low contents Al2O3 (1.14 wt%) CaO (0.65 wt%), suggesting they are depleted peridotite protoliths (e.g., harzburgites dunites). high L.O.I. value (13.7 serpentinite indicates intense hydration serpentinization during alteration processes. Petrographic geochemical studies suggest that were likely formed after peridotites a supra-subduction zone (SSZ) setting fore-arc setting). Spilitic basalt shows tholeiitic affinity mantle source. arc-related metasediments represented mainly by schists slate. Many samples relatively alumina (Al2O3 < 15%), clay content formation an setting. In contrast, island-arc metabasalts meta-andesites crystallized from calc-alkaline magmas immature oceanic arcs.