期刊
SPACE SCIENCE REVIEWS
卷 135, 期 1-4, 页码 203-220出版社
SPRINGER
DOI: 10.1007/s11214-007-9267-2
关键词
S-33; S-36; multiple-sulphur isotope; sulfur isotope; sulphur isotope; mass-independent fractionation; Archean; biosignature; meteorite; sulfate reduction; hydrothermal; photochemical
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.
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