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Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone

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 (δ(34)S(pyr)). It is unclear to what extent stratigraphic δ(34)S(pyr) variations reflect...

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Autores principales: Pasquier, Virgil, Fike, David A., Halevy, Itay
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8292381/
https://www.ncbi.nlm.nih.gov/pubmed/34285238
http://dx.doi.org/10.1038/s41467-021-24753-x
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author Pasquier, Virgil
Fike, David A.
Halevy, Itay
author_facet Pasquier, Virgil
Fike, David A.
Halevy, Itay
author_sort Pasquier, Virgil
collection PubMed
description 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 (δ(34)S(pyr)). It is unclear to what extent stratigraphic δ(34)S(pyr) 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 δ(34)S(pyr) of local environmental changes along the Peru margin. Stratigraphically coherent glacial-interglacial δ(34)S(pyr) 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 (34)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 δ(34)S(pyr), adding to the growing body of evidence highlighting the local controls on these records.
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spelling pubmed-82923812021-07-23 Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone Pasquier, Virgil Fike, David A. Halevy, Itay Nat Commun Article 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 (δ(34)S(pyr)). It is unclear to what extent stratigraphic δ(34)S(pyr) 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 δ(34)S(pyr) of local environmental changes along the Peru margin. Stratigraphically coherent glacial-interglacial δ(34)S(pyr) 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 (34)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 δ(34)S(pyr), adding to the growing body of evidence highlighting the local controls on these records. Nature Publishing Group UK 2021-07-20 /pmc/articles/PMC8292381/ /pubmed/34285238 http://dx.doi.org/10.1038/s41467-021-24753-x Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Pasquier, Virgil
Fike, David A.
Halevy, Itay
Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone
title Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone
title_full Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone
title_fullStr Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone
title_full_unstemmed Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone
title_short Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone
title_sort sedimentary pyrite sulfur isotopes track the local dynamics of the peruvian oxygen minimum zone
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8292381/
https://www.ncbi.nlm.nih.gov/pubmed/34285238
http://dx.doi.org/10.1038/s41467-021-24753-x
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