Physics
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980orli...10..325a&link_type=abstract
Origins of Life, Volume 10, Issue 4, pp.325-333
Physics
2
Scientific paper
Sulfur isotope fractionation values have been measured in sedimentary sulfides of varying ages, The ‘Antiquity and evolutionary status of bacterial sulfate reduction...’ has been inferred from these measurements by Schidlowski (1979). However, under experimental conditions, the isotope values vary widely due to inadequately controlled variables. Thus the direct extrapolation of sulfur isotope fractionation values measured in the laboratory to those measured in sedimentary rocks is unwarranted. New sulfur transforming microbes have been described and recent measurements indicate that inorganic processes affect sulfur isotope fractionation values. This information is summarized here; at present sulfur isotope fractionation values are insufficient to determine the antiquity of sulfate reduction.
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