Unraveling sources of A-type magmas in juvenile continental crust: Constraints from compositionally diverse Ediacaran post-collisional granitoids in the Katerina Ring Complex, southern Sinai, Egypt

The Ediacaran post-collisional magmatic cycle of the Katerina Ring Complex, northern region of the Arabian–Nubian Shield (ANS; southern Sinai, Egypt), is characterized by a large diversity of A-type felsic igneous rocks: quartz syenite porphyries, microsyenites, quartz monzonites, aluminous syenogranites, alkali feldspar granites and aplites, and peralkaline granites. Estimated magmatic temperatures show a large range of variation: 1) >900°C in quartz syenite porphyries and quartz monzonites, characterized by early saturation in respectively augite+enstatite and fluorian–titanian magnesiohastingsite+andesine; 2) ca. 712–784°C in microsyenites with diopside in metaluminous compositions and aegirine–augite overgrown by aegirine in nearly peralkaline compositions; 3) ca. 880°C in aluminous syenogranites with annite that changed to siderophyllite+phengite in more evolved aluminous alkali feldspar granites and aplites at