Middle Miocene gypsum, Gulf of Suez: marine or nonmarine?

Middle Miocene gypsum on the eastern coast of the Gulf of Suez, west-central Sinai, includes massive and bedded selenite. These selenites are interpreted as primary deposits because of their textures and fabrics such as vertically oriented crystals. The nearly total absence of fluid inclusions with final ice melting temperatures below -7.0°C indicates that the gypsum did not form from simple evaporative concentration of seawater. Rather, the fluid-inclusion data suggest that gypsum grew from: 1) "recycled' seawater, enriched in CaSO₄, whereby seawater dissolved surrounding gypsum or anhydrite deposits, or 2) mixed seawater-nonmarine waters. -from Authors