Bulk and grain-scale minor sulfur isotope data reveal complexities in the dynamics of Earth’s oxygenation
<jats:title>Significance</jats:title> <jats:p> The permanent disappearance of mass-independent sulfur isotope fractionation (S-MIF) from the sedimentary record has become a widely accepted proxy for atmospheric oxygenation. This framework, however, neglects...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Proceedings of the National Academy of Sciences
2023
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| Online Access: | https://hdl.handle.net/1721.1/148144 |
| _version_ | 1826190739452723200 |
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| author | Izon, Gareth Luo, Genming Uveges, Benjamin T Beukes, Nicolas Kitajima, Kouki Ono, Shuhei Valley, John W Ma, Xingyu Summons, Roger E |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Izon, Gareth Luo, Genming Uveges, Benjamin T Beukes, Nicolas Kitajima, Kouki Ono, Shuhei Valley, John W Ma, Xingyu Summons, Roger E |
| author_sort | Izon, Gareth |
| collection | MIT |
| description | <jats:title>Significance</jats:title>
<jats:p>
The permanent disappearance of mass-independent sulfur isotope fractionation (S-MIF) from the sedimentary record has become a widely accepted proxy for atmospheric oxygenation. This framework, however, neglects inheritance from oxidative weathering of pre-existing S-MIF–bearing sedimentary sulfide minerals (i.e., crustal memory), which has recently been invoked to explain apparent discrepancies within the sulfur isotope record. Herein, we demonstrate that such a crustal memory effect does not confound the Carletonville S-isotope record; rather, the pronounced Δ
<jats:sup>33</jats:sup>
S values identified within the Rooihoogte Formation represent the youngest known unequivocal oxygen-free photochemical products. Previously observed
<jats:sup>33</jats:sup>
S-enrichments within the succeeding Timeball Hill Formation, however, contrasts with our record, revealing kilometer-scale heterogeneities that highlight significant uncertainties in our understanding of the dynamics of Earth’s oxygenation.
</jats:p> |
| first_indexed | 2024-09-23T08:44:37Z |
| format | Article |
| id | mit-1721.1/148144 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:44:37Z |
| publishDate | 2023 |
| publisher | Proceedings of the National Academy of Sciences |
| record_format | dspace |
| spelling | mit-1721.1/1481442023-02-23T03:46:31Z Bulk and grain-scale minor sulfur isotope data reveal complexities in the dynamics of Earth’s oxygenation Izon, Gareth Luo, Genming Uveges, Benjamin T Beukes, Nicolas Kitajima, Kouki Ono, Shuhei Valley, John W Ma, Xingyu Summons, Roger E Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences <jats:title>Significance</jats:title> <jats:p> The permanent disappearance of mass-independent sulfur isotope fractionation (S-MIF) from the sedimentary record has become a widely accepted proxy for atmospheric oxygenation. This framework, however, neglects inheritance from oxidative weathering of pre-existing S-MIF–bearing sedimentary sulfide minerals (i.e., crustal memory), which has recently been invoked to explain apparent discrepancies within the sulfur isotope record. Herein, we demonstrate that such a crustal memory effect does not confound the Carletonville S-isotope record; rather, the pronounced Δ <jats:sup>33</jats:sup> S values identified within the Rooihoogte Formation represent the youngest known unequivocal oxygen-free photochemical products. Previously observed <jats:sup>33</jats:sup> S-enrichments within the succeeding Timeball Hill Formation, however, contrasts with our record, revealing kilometer-scale heterogeneities that highlight significant uncertainties in our understanding of the dynamics of Earth’s oxygenation. </jats:p> 2023-02-22T16:15:38Z 2023-02-22T16:15:38Z 2022 2023-02-22T16:04:21Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/148144 Izon, Gareth, Luo, Genming, Uveges, Benjamin T, Beukes, Nicolas, Kitajima, Kouki et al. 2022. "Bulk and grain-scale minor sulfur isotope data reveal complexities in the dynamics of Earth’s oxygenation." Proceedings of the National Academy of Sciences of the United States of America, 119 (13). en 10.1073/PNAS.2025606119 Proceedings of the National Academy of Sciences of the United States of America Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Proceedings of the National Academy of Sciences PNAS |
| spellingShingle | Izon, Gareth Luo, Genming Uveges, Benjamin T Beukes, Nicolas Kitajima, Kouki Ono, Shuhei Valley, John W Ma, Xingyu Summons, Roger E Bulk and grain-scale minor sulfur isotope data reveal complexities in the dynamics of Earth’s oxygenation |
| title | Bulk and grain-scale minor sulfur isotope data reveal complexities in the dynamics of Earth’s oxygenation |
| title_full | Bulk and grain-scale minor sulfur isotope data reveal complexities in the dynamics of Earth’s oxygenation |
| title_fullStr | Bulk and grain-scale minor sulfur isotope data reveal complexities in the dynamics of Earth’s oxygenation |
| title_full_unstemmed | Bulk and grain-scale minor sulfur isotope data reveal complexities in the dynamics of Earth’s oxygenation |
| title_short | Bulk and grain-scale minor sulfur isotope data reveal complexities in the dynamics of Earth’s oxygenation |
| title_sort | bulk and grain scale minor sulfur isotope data reveal complexities in the dynamics of earth s oxygenation |
| url | https://hdl.handle.net/1721.1/148144 |
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