期刊
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, VOL 42
卷 42, 期 -, 页码 733-768出版社
ANNUAL REVIEWS
DOI: 10.1146/annurev-earth-050212-124126
关键词
sulfur cycle; compound-specific sulfur isotope analysis; sedimentary organic matter; organic-inorganic interactions; thermochemical sulfate reduction
Organosulfur compounds (OSCs) play important roles in the formation, preservation, and thermal degradation of sedimentary organic matter and the associated petroleum generation. Improved analytical techniques for S isotope analysis have recently enhanced our understanding of the mechanisms for OSC formation and maturation and their associated S isotope distributions. The close interaction of OSCs with inorganic S species throughout their formation and maturation affects their S-34/S-32 isotopic ratio (delta S-34), forming specific signatures for distinct sources and processes. Ultimately, thermal maturation homogenizes the delta S-34 values of different fractions and individual compounds. Reservoir processes such as thermochemical sulfate reduction (TSR) introduce exogenous and isotopically distinct S into hydrocarbons and can significantly change the delta S-34 of petroleum or kerogen. Specific OSCs react at different rates and thus can be used to evaluate the extent of processes such as TSR. This article reviews factors that affect the S-34/S-32 isotopic distribution of OSCs along pathways of formation, diagenesis, and thermal alteration.
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