Diagenesis and pervasive dolomitization of pre- and post evaporite shallow marine carbonates, Ras Banas Peninsula, Red Sea Coast, Egypt

Abstract The present study deals with diagenesis and dolomitization modeling of Middle Miocene – Quaternary sedimentary sequence outcropped at Ras Banas Peninsula, Egyptian Red Sea Coast. This is comprising successively overlapped clastics, carbonates, evaporites attaining 254 m total thickness resting on the Pre-Cambrian basement rocks in Peninsula. Diagenetic history were carefully investigated using several techniques including petrographic microscope, XRD, SEM, cathodoluminescence, atomic absorption, isotopes oxygen carbon. conspicuous phenomena pervasive directly pre- post evaporite limestone components. These dolomites are mostly nonstochiometric, poorly to moderately ordered crystals. Based all results obtained from this study, processes Peninsula result complex geologic setting, paleo-climate changes, tectonic activity, sea-level fluctuations. proposed graphic model describes mechanism which refers mixed meteoric-hypersaline water environments.