Carbon isotopes in pore water, calcite, and organic carbon from distal turbidites of the Madeira Abyssal Plain

Details Carbon isotopes in pore water, calcite, and organic carbon from distal turbidites of the Madeira Abyssal Plain Carbon isotopes in pore water, calcite, and organic carbon from distal turbidites of the Madeira Abyssal Plain

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2997m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 11, pp.2997-3004

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Scientific paper

Carbon isotope data are given for organic matter, calcite, and pore water in carbonate turbidites from the Madeira Abyssal Plain. The carbon isotope composition of dissolved inorganic carbon (DIC) in pore water is between 0.3 and 1%. heavier than modelled values. The 13 C of DIC added to the system is -5.5 to -6.9%., whereas the predicted value is -9.0%.. This difference does not result from isotopic fractionation of organic matter or calcite. During diagenesis, 31% of the organic matter is oxidized. The isotopic composition is -19.4 ± 0.1%. before and after oxidation. Depressurization artefacts affecting DIC occur at the sediment-water interface and at a lithologic discontinuity within the sediment.

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