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Carbonates and Evaporites

, Volume 15, Issue 2, pp 130–137 | Cite as

Mode of formation and sedimentary association of the reefal sediments, Ras Abu El Darag, Gulf of Suez, Egypt

  • Amr A. El-Sammak
  • Mahmoud Kh. El-Sayed
  • Mohammed A. El-Sabrouti
Article
  • 55 Downloads

Abstract

The present study aims to examine the mode of formation and sedimentary association of the reefal sediments, Ras Abu el-Darag, northern Gulf of Suez. Samples were collected from different zones along a traverse section perpendicular to the coastline. Geochemical, mineralogical and petrographical studies were performed. In addition the chemistry, mineralogy, oxygen and carbon isotope analyses were been done on separate ooids from selected samples. Ras Abu el-Darag sediments consist mainly of nonskeletal components mixed with skeletal components. Low diversity of skeletal components was observed. Aragonite is the major carbonate mineral, followed by calcite (4–8 mol% MgCO3) then Mg-calcite (> 8 mol% MgCO3) and dolomite. Dolomite, found in Ras Abu el-Darag sediments, seems to be partially syngenetic in origin due to microbial activity and partially allochthonous derived from adjacent coastal areas. Ooids are the major sedimentary constituents. These ooids are polymineralic and consist of three minerals, aragonite which comprises about 73.3% followed by calcite and Mg-calcite. Data of δO18 and δC13 on some selected ooids fall within the field of shallow marine carbonates. δO18 ranges from 2.834%. to 3.635%.. On the other hand δC13 is ranging between −0.014%. and 0.695%.. On the basis of the size of nucleus, the thickness of laminae, the type of the nucleus, as well as the situation in Ras Abu el-Darag sediments where those ooids were not associated with mud, the ooids found in Ras Abu el-Darag sediments are considered to be autochthonous ooids having intrabasinal origin.

Keywords

Dolomite Aragonite Ooids Peloids Oolite 
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 2000

Authors and Affiliations

  • Amr A. El-Sammak
    • 1
  • Mahmoud Kh. El-Sayed
    • 1
  • Mohammed A. El-Sabrouti
    • 1
  1. 1.Department of Oceanography, Faculty of ScienceUniversity of AlexandriaEgypt

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