Carbonates and Evaporites

, Volume 20, Issue 2, pp 107–115 | Cite as

Multiple dolomitization events of the Lower Carboniferous Um Bogma Formation, west central Sinai, Egypt

  • M. N. Shaaban
  • H. M. Holail
  • K. N. Sedeik
  • M. A. Rashed


The Lower Carboniferous Um Bogma Formation in west-central Sinai, Egypt displays extensive and pervasive dolomitization. The combined petrographic/isotopic/stratigraphic investigations of the dolomite succession in the studied area reveal the presence of two distinct dolomite types: dolomite type (I) is confined to the basal part of the succession being associated with economic ferro-manganese deposits, and dolomite type (II) is located near the upper part of the succession. Silt, clay and marl beds vertically separate the two dolomitic units.

The dominance of ooid and benthic fossil ghosts in the basal dolomite type (I) supports the suggestion that the CaCO3 precursor has been formed under shallow agitated subtidal setting. The terrigenous beds that overlie this basal unit indicate that that the area has been brought into a meteoric realm during a subsequent lowstand period even before the emplacement of the upper part of the formation. During this period considerable stabilization of the initial metastable CaCO3 phases into diagenetic low-Mg calcites has presumably took place.

The persistent stratigraphic distribution of dolomite type (II) throughout the entire area and the typical marine δ13C values (+1.1 and 2.9‰ PDB) are consistent with platform-wide pumping system within a subtidal setting. Early stabilization of the initial CaCO3 fabrics of the basal carbonate unit impeded their dolomitization during this stage. Subsequent shallow burial stabilization of dolomite type (II) is assessed from the well-developed stylolites, the non-planar crystal boundaries, the undulose extinction, the low porosity and the relatively depleted δ18O (−5.1 to −7‰ PDB) values. The initiation of dolomite type (I) was a post-burial process as indicated from the euhedral planar crystal boundaries, the high intercrystalline porosity and the absence of any compaction fabrics. The oxygen (3.3 to 4.7‰ PDB) and carbon (+1.9 to 3.4‰ PDB) isotopic values of this type of dolomite are possibly inherited from the CaCO3 precursor where dolomitization took place from more or less unmodified marine water during period of minimum sea level fluctuations.


Dolomite Dolomitization Transgressive System Tract Stylolite Dolomite Type 
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  1. AMTHOR, J.E. and FRIEDMAN, G.M., 1992, Early- to late-diagenetic dolomitization of platform carbonates: Lower Ordovician Ellenburger Group, Permian Basin, West Texas:Journal of Sedimentary Petrology, v. 62, p. 131–144.Google Scholar
  2. BANNER, J.L., HANSON, G.N. and MEYERS, W.J., 1988, Waterrock interaction history of regionally extensive dolomites of the Burlington-Keokuk Formation (Mississipian): Isotopic evidence,in V. Shukla and P.A. Baker, eds., Sedimentology and geochemistry of dolostones. Special Publication of the Society for Economic Paleontologists and Mineralogists, v. 43, p.97–113.Google Scholar
  3. BRAITHWAITE, R., 1991, Dolomites, a review of origins, geometry and textures:Transactions of the Royal Society of Edinburgh: Earth Sciences, v. 82, p. 99–112.CrossRefGoogle Scholar
  4. BRAND, U., 1982, The oxygen and carbon composition of Carboniferous fossil components: sea water effects:Sedimentology, v. 29, p. 139–147.CrossRefGoogle Scholar
  5. CANDER, H.S., 1994, An example of mixing-zone dolomite, Middle Eocene Avon Park Formation, Floridan aquifer system:Journal of Sedimentary Research, v. A64, p. 615–629.Google Scholar
  6. EL-AGAMI, N.L., IBRAHIM, E.H., and ODAN, H.H., 2000, Sedimentary origin of the Mn-Fe ore of Um Bogma, South west Sinai: Geochemical and paleomagnetic evidence:Economic Geology, v. 95, p. 607–620.Google Scholar
  7. EL-GAMMAL, R.M.H., 1984, Geological studies on the stratigraphic succession of Umm Bogma District, west Central Sinai, Egypt. Unpubl. M.Sc. Thesis, Cairo University, 180 p.Google Scholar
  8. FRIEDMAN, G.M., 1959, Identification of carbonate minerals by staining methods:Journal of Sedimentary Petrology, v. 29, p. 87–97.Google Scholar
  9. FRIEDMAN, G.M., 1980, Dolomite is an evaporite mineral: evidence from the rock record and from sea-marginal ponds of the Red Sea,in D.H. Zenger, J.B. Dunham, and R.L. Ethington, eds., Concepts and Models of Dolomitization, Society of Economic Paleontologists and Mineralogists (SEPM) Special Publication, v.28, p. 69–80.CrossRefGoogle Scholar
  10. FRIEDMAN, G.M., 1995, Diverse origin of modern dolomite in the Levant:Carbonates and Evaporites, v. 10, p. 65–78.CrossRefGoogle Scholar
  11. GAO, G., 1990, Geochemical and isotopic constraints on the diagenetic history of a massive stratal, late Cambrian (Royer) dolomite, lower Arbuckle Group, Slick Hills, SW Oklahoma, USA:Geochimica et Cosmochimica Acta, v. 54, p. 1979–1989.CrossRefGoogle Scholar
  12. GAO, G., LAND, L.S., and ELMORE, R.D., 1995, Multiple episodes of dolomitization in the Arbuckle Group, Arbuckle Mountains, south-central Oklahoma: field, petrographic, and geochemical evidence:Journal of Sedimentary Research, v. A65, p. 321–331.Google Scholar
  13. HARDIE, L.A., 1987, Dolomitization- a critical review of some current views:Journal of Sedimentary Petrology, v. 57, p. 166–183.CrossRefGoogle Scholar
  14. ISSAWI, B., HINNAWI, M., FRANCIS, M., and MAZHAR, A., 1999, The Phanerozoic geology of Egypt: a geodynamic approach. Geological Survey of Egypt Special Publication, Cairo, 462 p.Google Scholar
  15. KORA, M., 1989, Lower Carboniferous (Visean) fauna from Wadi Budra, west Central Sinai, Egypt:Neur Jarbuch fur Geologie und Palaontologie, v. H9, p. 523–538.Google Scholar
  16. KORA, M. and JUX, U., 1986, On the Early Carboniferous macrofauna from the Um Bogma Formation, Sinai:Neur Jarbuch fur Geologie und Palaontologie, v. H2, p. 85–98.Google Scholar
  17. LAND, L.S., 1980, The isotopic and trace element geochemistry of dolomite: the state of art,in D.H. Zenger, J.B. Dunham, and R.L. Ethington, eds., Concepts and models of dolomitization. Special Publication of the Society for Economic Paleontologists and Mineralogists, v. 28, p. 87–110.Google Scholar
  18. LAND, L.S., 1985, The origin of massive dolomite:Journal of Geological Education, v. 33, p. 112–125.CrossRefGoogle Scholar
  19. LAND, L.S., LUND, H.J., and MCCULLOUGH, M.L., 1989, Dynamic circulation of interstitial sea water in a Jamaican fringing reef:Carbonates and Evaporites, v. 4, p. 1–7.CrossRefGoogle Scholar
  20. LOHMANN, K.C. and WALKER, J.C.G., 1989, The δ18O record of Phanerozoic abiotic marine calcite cements:Geophysical Research Letters, v. 16, p. 319–322.CrossRefGoogle Scholar
  21. MACHEL, H.G. and MOUNTJOY, E., 1986, The chemistry of environments of dolomitization- a reappraisal:Earth Science Reviews, v. 23, p. 175–222.CrossRefGoogle Scholar
  22. MART, J. and SASS, E., 1972, Geology and origin of the manganese ore of Um Bogma, Sinai:Economic Geology, v. 67, p. 145–155.CrossRefGoogle Scholar
  23. MIGASZEWSKI, Z.M., 1990, Devonian dolomites from the Holy Cross MTS, Poland: a new concept of the origin of massive dolomites based on petrographic and isotopic evidence:Journal of Geology, v. 99, p. 171–187.CrossRefGoogle Scholar
  24. MONTANEZ, I.P. and READ, J.F., 1992, Fluid-rock interaction history during stabilization of early dolomites, Upper Knox Group (Lower Ordovician), U.S. Appalachians:Journal of Sedimentary Petrology, v. 62, p. 753–778.Google Scholar
  25. PURSER, B.H., TUCKER, M.E., and ZENGER, D.H., 1994, Problems, progress and future research concerning dolomites and dolomitization: Special publication of the International Association of Sedimentology, v. 21, p. 3–20.Google Scholar
  26. QING, H. and MOUNTJOY, E.W., 1989, Multistage dolomitization in Rainbow Buildups, Middle Devonian Keg River Formation, Alberta, Canada:Journal of Sedimentary Petrology, v. 59, p. 114–126.Google Scholar
  27. SAID, R., 1990, The Geology of Egypt. Elsevier, Rotterdam.Google Scholar
  28. SALLER, A.H., 1984, Petrologic and geochemical constraints on the origin of subsurface dolomite, Enewetak Atoll: an example of dolomitization by normal seawater:Geology, v. 12, p. 217–220.CrossRefGoogle Scholar
  29. SHAABAN, M.N., HOLAIL, H.M., and RASHED, M.A., 1997, Dolomitization of Middle Miocene buildups, Um Gheig area, Red Sea coast, Egypt:Carbonates and Evaporites, v. 12, p. 264–275.CrossRefGoogle Scholar
  30. SIBLEY, D.F. and GREGG, J.M., 1987, Classification of dolomite rock textures:Journal of Sedimentary Petrology, v. 57, p. 955–963.Google Scholar
  31. SIBLEY, D.F., NORDENG, S.H., and BORKOWSKI, M.L., 1994, Dolomitization kinetics in hydrothermal bombs and natural settings:Journal of Sedimentary Research, v. A64, p. 630–637.CrossRefGoogle Scholar
  32. SOLIMAN, S.M., 1975, Petrology of Carboniferous dolostone and marine transgression over west-central Sinai, Egypt:Septieme Congres International de Stratigraphie et de Geologie du Carbonifere, v. IV, p. 253–265.Google Scholar
  33. SUN, S.Q., 1994, Prespective- a re-appraisal of dolomite abundance and occurrence in the Phanerozoic:Journal of Sedimentary Research, v. A64, p. 396–404.CrossRefGoogle Scholar
  34. VEIZER, J. and HOEFS, J., 1976, The nature of18O/16O and13C/12C secular trends in sedimentary carbonate rocks:Geochimica et Cosmochimica Acta, v. 40, p. 1387–1395.CrossRefGoogle Scholar
  35. WARREN, J., 2000, Dolomite, occurrence, evolution and economically important associations:Earth Science Reviews, v. 52, p. 1–81.CrossRefGoogle Scholar

Copyright information

© Springer 2005

Authors and Affiliations

  • M. N. Shaaban
    • 1
  • H. M. Holail
    • 1
  • K. N. Sedeik
    • 1
  • M. A. Rashed
    • 1
  1. 1.Geology Department, Faculty of ScienceAlexandria UniversityAlexandriaEgypt

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