Carbon and oxygen isotope ratios in diagenetic carbonates from marine sediments

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Scientific paper

The isotopic composition of some sixty samples of penecontemporaneous diagenetic carbonates from marine horizons shows that they are strikingly different from normal marine limestones. The variation of C 13 ratio is 5·6 per cent, the lightest carbonate measuring -54%. A mechanism for the formation of such light carbon dioxide is postulated, involving the enzymic decarboxylation of organic compounds at low temperatures. A study of the oxygen isotopic composition of coexisting calcite and rhodochrosite indicates that, whereas the latter has retained its isotopic composition from the time of precipitation, the calcite has undergone equilibration during diagenesis. Isotopic measurements on such diagenetic carbonates would confuse palaeoenvironmental studies but may throw light on the processes of diagenesis.

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