Geochemistry and dolomitization of Pleistocene coral reefs, in the Gulf of Aqaba region, South Sinai, Egypt

Fathy Ibtehal and Hertelendi Ede and Haas János: Geochemistry and dolomitization of Pleistocene coral reefs, in the Gulf of Aqaba region, South Sinai, Egypt. In: Acta mineralogica-petrographica, (38). pp. 73-94. (1997)

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Pleistocene coral reef terraces are exposed in two levels at the southeastern part of Sinai Peninsula along the Gulf of Aqaba coast. Mineralogically, the reef formations are made up by aragonite, low and high Mg-calcite and protodolomite. Evaporites and iron oxides/hydroxides were also identified. Pétrographie characteristics of the two reef sequences revealed that the reefal carbonates were affected by early, near-surface dolomitization and pervasive dolomitization. In the former case, aragonites and Mg-calcites were replaced respectively by dolomites. Pervasive dolostones were formed by mimetical replacement of aragonitic and high Mg-calcitic allochems. Reefal limestones and dolostones were analyzed for Ca, Mg, Sr, Mn, Fe and Na. Concentrations of these major and trace elements are consistent with progressive diagenesis of the reef terraces under evaporated marine water, brine and freshwater conditions. Oxygen and carbon isotope values range between -9.60 to +3.39 %o PDB Ô018 and -4.35 to +3.17 %o PDB 5C13 respectively suggest dolomitization by marine water modified by evaporation. The depleted isotope values related to freshwater diagenesis.

Item Type: Article
Journal or Publication Title: Acta mineralogica-petrographica
Date: 1997
Volume: 38
ISSN: 0365-8066
Page Range: pp. 73-94
Language: English
Publisher: University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Place of Publication: Szeged
Related URLs:
Uncontrolled Keywords: Kőzettan, Ásványtan, Földtan, Geokémia
Additional Information: Bibliogr.: p. 82-83. ; ill. ; összefoglalás angol nyelven
Subjects: 01. Natural sciences
01. Natural sciences > 01.05. Earth and related environmental sciences
Date Deposited: 2016. Oct. 17. 09:25
Last Modified: 2022. Jul. 27. 12:41

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