Variations in sulphur isotope ratios have been used as biosignatures in early rock records and Martian meteorites because some microbial sulphur metabolisms are known to produce large magnitude mass-dependent sulphur isotope fractionation. In order to establish the sulphur isotope biosignature, however, it becomes critically important to evaluate abiogenic processes that fractionate sulphur isotope ratios. A brief review is given here for the fundamental systematics and characteristics of multiple-sulfur isotope effects associated with (1) biological, (2) hydrothermal, and (3) photochemical processes. High-precision analysis of all four isotope abundance of sulphur may provide a unique constraint to establish biosignatures in space exploration. © 2007 Springer Science+Business Media B.V.
CITATION STYLE
Ono, S. (2008). Multiple-sulphur isotope biosignatures. Space Science Reviews, 135(1–4), 203–220. https://doi.org/10.1007/s11214-007-9267-2
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