Modern ooids of Cleopatra Beach, Gokova (South Aegean Sea) Turkey: Results from petrographyand scanning electron microscopy
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Modern ooids from the Cleopatra Beach on Island in the Gökova Bay, South Aegean Sea, resemble ooids formed on the Bahamian platform. The concentric coatings of the ooids consist of two or more laminae around a carbonate- or non-carbonate nucleus. The oolite cortex is transparent, whereas the non-transparent portions seem to be the dark fields on the oolitic surfaces. The ooids are mixed with molluscan skeletal debris displaying micritic envelopes. Weakly consolidated ooids have been cemented by calcite in the form of meniscus cement.
Micronodules attributed to microboring organisms such as cyanobacteria or coccoids;
Tablet-shaped crusts of hemispheres; likely produced by bacterial activity,
Acicular- or elongate crystals precipitated directly from sea water in vacated holes of the microborings or as of the tangentially orientated parts of the ooids.
Algal- and bacterial processes are thought to have been main sources of the carbonate that was precipitated to form the ooids.
KeywordsOoids Calcite Crystal Oolite Sedimentary Petrology Micrite Envelope
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- BEALES, F.W., 1958. Ancient sediments of Bahaman type:Amer. Assoc. Petrol. Geologists Bull., v. 42, p. 1845–1880.Google Scholar
- ESELLER, G., 1990, Modern ooids from Sedir Island (Cleopatra Beach). S.Aegean Sea: International Earth Sciences Congress on Aegean Region, Izmir-Türkiye, Abstracts, p. 101–102.Google Scholar
- FABRICIUS, F.H., 1977, Origin of marine ooids and grapestones:Contrib. Sed., v. 7, p. 113.Google Scholar
- FREEMAN, T., 1962, Quiet water oolites from Laguna Madre, Texas:Jour. Sedimentary Petrology, v. 32, p. 475–483.Google Scholar
- FRIEDMAN, G.M., AMIEL, A.J., BRAUN, MOSHE, and MILLER, D.C., 1973, Generation of carbonate particles and laminites in algal mats-example from sea-marginal hypersaline pool, Gulf of Aqaba, Red Sea:Am. Assoc. Petroleum Geologists, Bull., v. 57, p. 541–557Google Scholar
- GARBER, R.A., FRIEDMAN, G.M., and NISSENBAUM, A., 1981, Concentric aragonitic ooids from the Dead Sea:Jour. Sedimentary Petrology, v. 51, p. 455–458.Google Scholar
- KOBLUK, D.R., and RISK, M.J., 1977, Calcification of exposed filaments of endolithic algae, micrite envelope formation and sediment production:Jour. Sedimentary Petrology, v. 47, p. 517–528.Google Scholar
- LALOU, C., 1957, Studies on bacterial precipitation of carbonates in sea water:Jour. Sedimentary Petrology, v. 27, p. 190–195.Google Scholar
- MAY, J.A.; and PERKINS, R.D., 1979, Endolithic infestation of carbonate substrates below the sediment-water interface:Jour. Sedimentary Petrology, v. 49, p. 357–378.Google Scholar
- MITTERER, R.M., 1971, Comparative amino acid composition of calcified and non-calcified polychaete worm tubes:Comp. Biochem. Physiol. p. 38 B, 405–409.Google Scholar