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- W1529375870 abstract "The sulphur isotopic composition of sedimentary sulphides records the temporal evolution of the Precambrian sulphur cycle. Early Archaean sediments show δ34S values for pyrite around 0‰ and are interpreted to reflect a predominantly magmatic origin for sedimentary pyrite. Pyrite in sediments across the Archaean–Proterozoic transition record a substantial variability in δ34S that resembles modern style bacterial sulphate reduction. During Proterozoic time, bacterial sulphate reduction, although in principle organic carbon limited, also appears to be characterized by sulphate limitation as evident from frequently positive sulphur isotope values. This is attributed to effective sulphate turnover as a consequence of readily metabolizable organic matter and possibly a lower sulphate concentration in the ocean. Based on distinct distributions of δ34S values for sedimentary pyrite, the Neoproterozoic sulphur cycle appears to have responded to perturbations of the global ocean/atmosphere system as a consequence of repeated glaciations and resulting biogeochemical changes. This is consistent with the proposed Snowball Earth concept. Interpretations of the Precambrian sedimentary sulphur cycle result from a systematic assessment of organic carbon, sulphide sulphur and reactive iron abundances, 334 new and several hundred previously published sulphur isotope values for sedimentary pyrite and a comparison to the isotopic composition of Precambrian seawater sulphate as evident from marine evaporites." @default.
- W1529375870 created "2016-06-24" @default.
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- W1529375870 date "2002-02-18" @default.
- W1529375870 modified "2023-09-23" @default.
- W1529375870 title "The Isotopic Composition of Precambrian Sulphides—Seawater Chemistry and Biological Evolution" @default.
- W1529375870 doi "https://doi.org/10.1002/9781444304312.ch4" @default.
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