AI Article Synopsis
- Sulfur cycling plays a crucial role in sedimentary environments, affecting organic carbon remineralization and influencing sulfur isotope ratios (δS) in pyrite, but the factors behind δS variations are still debated.
- Research along the Peru margin indicates that δS fluctuations during glacial-interglacial periods were driven primarily by local environmental changes, especially the expansion of the Oxygen Minimum Zone and increased organic matter deposition.
- Findings show that enhanced microbial activity during these periods led to more significant sulfur retention in porewater, linking organic carbon loading as a key influence on δS variations and stressing the importance of local factors in interpreting these records.
Article Abstract
Sulfur cycling is ubiquitous in sedimentary environments, where it mediates organic carbon remineralization, impacting both local and global redox budgets, and leaving an imprint in pyrite sulfur isotope ratios (δS). It is unclear to what extent stratigraphic δS variations reflect local aspects of the depositional environment or microbial activity versus global sulfur-cycle variations. Here, we couple carbon-nitrogen-sulfur concentrations and stable isotopes to identify clear influences on δS of local environmental changes along the Peru margin. Stratigraphically coherent glacial-interglacial δS fluctuations (>30‰) were mediated by Oxygen Minimum Zone intensification/expansion and local enhancement of organic matter deposition. The higher resulting microbial sulfate reduction rates led to more effective drawdown and S-enrichment of residual porewater sulfate and sulfide produced from it, some of which is preserved in pyrite. We identify organic carbon loading as a major influence on δS, adding to the growing body of evidence highlighting the local controls on these records.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8292381 | PMC |
| http://dx.doi.org/10.1038/s41467-021-24753-x | DOI Listing |
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