Isotope Geochemistry of Primary and Secondary Carbonate Minerals in the Shaban-Deep (Red Sea)

  • P. Stoffers
  • R. Botz
  • J. Scholten


The isotopic composition of carbonate sediments from the Shaban Deep indicates that minerals of low- and high-Mg calcite and aragonite formed in near-isotopic equilibrium with Red-Sea-water bicarbonate at normal sedimentary temperatures.

However, within organic-rich layers, diagenetically formed dolomite and rhodochrosite are found. The isotopic composition of the poorly ordered dolomite is characterized by negative δ13C values (δ13Cmin = − 5.7‰). This indicates that 12C-rich biogenic CO2 contributed to the carbonate formation. It is believed that this 12C-rich biogenic Co2 was formed during the anaerobic oxidation of organic matter during sulphate reduction.


Oxygen Isotope Carbonate Mineral Isotope Geochemistry Oxygen Isotope Fractionation Carbonate Mineralogy 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • P. Stoffers
  • R. Botz
  • J. Scholten
    • 1
  1. 1.Geologisch-Paläontologisches Institut u. MuseumUniversität KielKielGermany

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