Mathematics – Logic
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2341t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 9, pp.2341-2348
Mathematics
Logic
26
Scientific paper
Sulfur and oxygen isotope ratios in sulfate cannot distinguish unambiguously between biological and abiological mechanisms of sulfide oxidation because similar isotope signatures have been observed or predicted for different mechanisms. However, field and laboratory data on sulfur and oxygen isotopes have demonstrated the importance of understanding environmental factors to limit the set of reasonable mechanisms. In this paper, we review sulfur and oxygen isotope compositions reported in both field and laboratory studies of sulfide oxidation. We develop a new classification scheme for sulfide oxidation based on whether the electron transfer involves incorporation of oxygen from H 2 O or O 2 in the sulfate. Four mechanisms for H 2 O-oxygen incorporation and two for O 2 -oxygen incorporation are presented. We also point out several environmental factors such as the production of intermediate sulfoxyanions or the presence of certain Thiobacillus species that may determine whether sulfur is fractionated during oxidation. More information on environmental factors is needed.
Harris Robin F.
Toran Laura
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