Oxygen and carbon isotope ratios in coexisting calcites and dolomites from recent and ancient sediments

The O18O16 and C13C12 ratios of coexisting sedimentary dolomites and calcium carbonates from a variety of environments, modes of formation and geological ages were measured

Egon T. Degens

2003

Scholarcy highlights

  • The O18O16 and C13C12 ratios of coexisting sedimentary dolomites and calcium carbonates from a variety of environments, modes of formation and geological ages were measured
  • The data reflect the processes of dolomitization of calcium carbonates and their subsequent history
  • The δO18 of dolomite are the same or greater than that of the coexisting calcite. This is in accordance with previously postulated mechanisms based on isotope measurements of hydrothermal and of laboratory synthesized cogenetic calcites and dolomites
  • The carbon isotope values of the measured carbonates are usually within the range found for marine limestones

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