Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt

Abstract Variable single and/or swarms of post-granitic dikes are widespread at Gabal Serbal, Southwestern Sinai, Egypt. The present article aims to identify and discriminate these multiphase through detailed geological, petrographical, geochemical examinations. These classified into two subphases: (1) acidic (porphyritic dacite, microgranite, granophyre, alkaline granophyre dikes); (2) basic (basalt dolerite dikes). They range from vertical or steeply inclined bodies, 0.5–15 m wide, pink black color, NE–SW N–S directions. Acidic with different mineralogical constituents have medium high k -characters, originating calc-alkaline magma extruded in a volcanic arc environment. In contrast, tholeiitic developing within plate Basic enriched opaque minerals, where the basaltic dike contains iron oxides (magnetite hematite), such as apatite addition copper minerals. Dolerite comprises magnetite, titanomagnetite, pyrite.