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Carbonates and Evaporites

, Volume 12, Issue 2, pp 185–191 | Cite as

Dolomitization and dedolomitization of Miocene carbonates at Gabal El-Safra, Sherm el Sheikh area, sinai, Egypt

  • El-Sayed A. A. Youssef
Article

Abstract

Dolomitization and dedolomitization of the Middle Miocene carbonate sequence at Gabal EISafra resulted in the formation of fine-crystalline dolomite (type 1), coarse crystalline “sucrosic” dolomite (type 2) and dedolostone. The first type occurs as either scattered crystals or patches of hypidiotopic to idiotopic, nearly stoichiometric dolomite crystals ranging from 5–20 μm, whereas the second type occurs as xenotopic to idiotopic dolomite crystals ranging in size from 50 to 200 μm and composed of trace-element depleted, more stoichiometric, coarsely crystalline clear rims that enclose Ca- and trace element-enriched cloudy cores of the dolomite crystals. However, the dedolostone occurs as (1) polycrystalline rhombic pseudomorphs of calcite and gypsum after dolomite, (2) relicts of incompletely dissolved dolomite and dedolomite crystals, (3) hollow dolomite rhombs and rhombohedral pores due to dissolution of the cloudy cores or the whole dolomite rhombs, respectively and (4) filling of hollow dolomite rhombs by gypsum. Replacement and dissolution of dolomite crystals began from the cores and expanded outward.

Stable isotope data shows that the finely crystalline dolomite has high δ18O values (mean=+1.81‰ PDB) and relatively low δ13C values (mean=−2.9‰ PDB), whereas the coarse crystalline dolomite has lower δ18O values (mean=+0.311‰ PDB) and δ13C values (mean=−2.08‰ PDB). The average Na+ and Sr+2 concentrations of the coarse crystalline dolomite are about 208 ppm and 118 ppm, respectively, whereas the mole % Mg CO3 ranges from 45 to 50. All the above results indicate that finely crystalline dolomite represents an early pre-burial phase of dolomitization under the influence of marine water, whereas the cores and rims of coarsely crystalline dolomite represent shallow and relatively deep burial phases of dolomitization under the influences of diluted and more diluted marine water respectively (mixed water model of dolomitization). However, the dedolostone represents a subaerial phase of diagenesis, after uplifting of dolostone, under the influence of phreatic environment.

Keywords

Dolomite Middle Miocene Dolomitization Dolomite Crystal Crystalline Dolomite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 1997

Authors and Affiliations

  • El-Sayed A. A. Youssef
    • 1
  1. 1.Geology Department Faculty of ScienceCairo UniversityGizaEgypt

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