The late Ediacaran (580-590Â Ma) onset of anorogenic alkaline magmatism in the Arabian-Nubian Shield: Katherina A-type rhyolites of Gabal Ma'ain, Sinai, Egypt

► The Katherina volcanics is a succession of rhyolitic lavas with minor pyroclastics. ► They exhibit a potassic alkaline and peraluminous affinity and A-type character. ► Evolution was through fractional crystallization of mantle-derived parental magma. ► Had been emplaced within anorogenic period in within-plate volcanic zones setting.