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- W1967768340 abstract "The Miocene evaporites on the Red Sea coast, Egypt, are interpreted as a sabkha-chenier complex, which includes deposition in shallow water as well as in supratidal environments Costal sabkhas and shallow subaqueous evaporite sequences are recognised. The subaqueous sequence is represented by nodular mosaic and massive crystalline gypsum covered by a surface layer of nodular, white, dense powdery anhydrite. The sabkha sequences are represented by (a) small mounds overlying the older rock unit (Gebel El Rusas Formation) composed of fenestral stromatolitic and nodular dolomites overlain by a dolomitic limestone layer, (b) thin layer overlying the subaqueous evaporite sequence and composed of fenestral stromatolitic dolomite overlain by a nodular anhydrite layer. The nodular structure in the subaqueous as well as the sabkha sequences is formed diagenetically by transformation and recrystallization process. The dolomites in both sabkha sequences (a and b) are characterised by low Na+ concentrations (143 to 755 ppm) and low values of δ18O (− 1.85 to −8.7‰ PDB). This indicates that the dolomites were formed from saline water mixed with fresh water. These dolomites are also characterised by a low δ13C (−12.95 to −27.1‰ PDB). This shows that the light carbon produced by the degradation of organic matter through the sulphate reduction process has played a significant role in the formation of these dolomites. Both microcrystalline and megacrystalline white dolomites are recognised in sabkha sequences. Relatively high concentrations of lead, zinc and copper are associated with the high percent of megacrystalline white dolomite." @default.
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- W1967768340 date "1986-06-01" @default.
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- W1967768340 title "Depositional and diagenetic models of some miocene evaporites on the Red Sea coast, Egypt" @default.
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- W1967768340 doi "https://doi.org/10.1016/0037-0738(86)90079-5" @default.
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