Isotopic fractionation between coexisting organic carbon--carbonate pairs in Precambrian sediments

Details Isotopic fractionation between coexisting organic carbon--carbonate pairs in Precambrian sediments Isotopic fractionation between coexisting organic carbon--carbonate pairs in Precambrian sediments

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39..585e&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Issue 5, pp.585-595

Mathematics

Logic

11

Scientific paper

13 C org and 13 C carb values of 58 coexisting organic carbon-carbonate pairs covering the whole Precambrian have yielded means of -24.7 ± 6.0%. [PDB] and +0.9 ± 2.7%. [PDB], respectively. Accordingly, isotopic fractionation between inorganic and organic carbon in Precambrian sediments is about the same as in geologically younger rocks ( 25%.), a slight increase displayed by the Early Precambrian pairs ( 28%.) being probably biassed by an over-representation in this age group of samples from one single locality (nevertheless, this value still lies within the range permitted for a possible deviation). It is reasonable to assume, therefore, that the overall isotope fractionation factor governing biological fixation of inorganic carbon has been virtually constant since some 3.3 × 10 9 yr ago.

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