Mathematics – Logic
Scientific paper
May 1953
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1953gecoa...3..235t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 3, Issue 5, pp.235-243
Mathematics
Logic
7
Scientific paper
The sulphur isotope content of marine sulphide and sulphate deposits, as found in limestone and shales covering a wide range of geological ages, has been investigated. The results indicate a striking correlation between geological age and isotopic content, particularly for the sulphides. It would appear that isotopic fractionation began about 700-800 million years ago and that since then the sulphides have been depleted and the sulphates enriched in the heavy isotopes of sulphur. The maximum spread in the S 32 /S 34 ratio at the present time is about 7% or about the fractionation expected, if the most favoured distribution (thermodynamic-equilibrium) of S 34 were established between SO = 4 and H 2 S. It seems fairly certain that the biological sulphur cycle in nature provides a mechanism for the exchange of the sulphur isotopes between SO = 4 and H 2 S. The results indicate that autotrophic organisms, which oxidize H 2 S, did not become significant before 700-800 million years ago.
Fleming Wendell H.
Macnamara J.
Thode H. G.
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