Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks
Abstract Understanding the interaction between molybdenum (Mo) and organic matter during microbial sulfate reduction is critical for the use of Mo to reconstruct marine redox conditions throughout Earth's history. However, little is known about Mo isotope fractionation and how it relates to org...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2024-03-01
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| Series: | Geochemistry, Geophysics, Geosystems |
| Online Access: | https://doi.org/10.1029/2023GC011379 |
| _version_ | 1797205657824264192 |
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| author | Zice Jia Yu Hu Germain Bayon Jörn Peckmann Xudong Wang Shanggui Gong Jie Li Harry H. Roberts Duofu Chen Dong Feng |
| author_facet | Zice Jia Yu Hu Germain Bayon Jörn Peckmann Xudong Wang Shanggui Gong Jie Li Harry H. Roberts Duofu Chen Dong Feng |
| author_sort | Zice Jia |
| collection | DOAJ |
| description | Abstract Understanding the interaction between molybdenum (Mo) and organic matter during microbial sulfate reduction is critical for the use of Mo to reconstruct marine redox conditions throughout Earth's history. However, little is known about Mo isotope fractionation and how it relates to organic matter remineralization during microbial sulfate reduction. Here, we report Mo abundances and isotopic (δ98Mo) compositions for bulk‐rock, non‐lithogenic and sequentially extracted fractions, including carbonate (carb), pyrite, and organic matter (OM), of seep carbonate rocks. Our data indicate that the difference between δ98Mocarb and δ98MoOM (Δ98Mocarb‐OM) displays significant variability in the studied samples, ranging between 0.72 and 1.01‰. Remarkably, the obtained Δ98Mocarb‐OM values indicate correlative trends with stable carbon isotope ratios and bulk abundances of (a) total organic carbon, (b) Mo, and (c) pyrite in seep carbonates, which we interpret as reflecting sustained adsorption of isotopically light Mo onto organic matter during enhanced sulfate reduction. On this basis, we put forward the concept that Δ98Mocarb‐OM of authigenic carbonate rocks can be used as a measure of the intensity of sulfate reduction and for reconstructing past interactions between Mo and organic matter in marine sediments. |
| first_indexed | 2024-04-24T08:54:37Z |
| format | Article |
| id | doaj.art-a7ce9c64471141be91dd515176d8df54 |
| institution | Directory Open Access Journal |
| issn | 1525-2027 |
| language | English |
| last_indexed | 2024-04-24T08:54:37Z |
| publishDate | 2024-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj.art-a7ce9c64471141be91dd515176d8df542024-04-16T08:35:30ZengWileyGeochemistry, Geophysics, Geosystems1525-20272024-03-01253n/an/a10.1029/2023GC011379Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate RocksZice Jia0Yu Hu1Germain Bayon2Jörn Peckmann3Xudong Wang4Shanggui Gong5Jie Li6Harry H. Roberts7Duofu Chen8Dong Feng9College of Oceanography and Ecological Science Shanghai Ocean University Shanghai ChinaCollege of Oceanography and Ecological Science Shanghai Ocean University Shanghai ChinaUniversity Brest CNRS Ifremer Geo‐Ocean Plouzané FranceCenter for Earth System Research and Sustainability Institute for Geology Universität Hamburg Hamburg GermanyCollege of Oceanography and Ecological Science Shanghai Ocean University Shanghai ChinaCollege of Oceanography and Ecological Science Shanghai Ocean University Shanghai ChinaState Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou ChinaCollege of the Coastal and Environment Coastal Studies Institute Louisiana State University Baton Rouge LA USACollege of Oceanography and Ecological Science Shanghai Ocean University Shanghai ChinaCollege of Oceanography and Ecological Science Shanghai Ocean University Shanghai ChinaAbstract Understanding the interaction between molybdenum (Mo) and organic matter during microbial sulfate reduction is critical for the use of Mo to reconstruct marine redox conditions throughout Earth's history. However, little is known about Mo isotope fractionation and how it relates to organic matter remineralization during microbial sulfate reduction. Here, we report Mo abundances and isotopic (δ98Mo) compositions for bulk‐rock, non‐lithogenic and sequentially extracted fractions, including carbonate (carb), pyrite, and organic matter (OM), of seep carbonate rocks. Our data indicate that the difference between δ98Mocarb and δ98MoOM (Δ98Mocarb‐OM) displays significant variability in the studied samples, ranging between 0.72 and 1.01‰. Remarkably, the obtained Δ98Mocarb‐OM values indicate correlative trends with stable carbon isotope ratios and bulk abundances of (a) total organic carbon, (b) Mo, and (c) pyrite in seep carbonates, which we interpret as reflecting sustained adsorption of isotopically light Mo onto organic matter during enhanced sulfate reduction. On this basis, we put forward the concept that Δ98Mocarb‐OM of authigenic carbonate rocks can be used as a measure of the intensity of sulfate reduction and for reconstructing past interactions between Mo and organic matter in marine sediments.https://doi.org/10.1029/2023GC011379 |
| spellingShingle | Zice Jia Yu Hu Germain Bayon Jörn Peckmann Xudong Wang Shanggui Gong Jie Li Harry H. Roberts Duofu Chen Dong Feng Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks Geochemistry, Geophysics, Geosystems |
| title | Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks |
| title_full | Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks |
| title_fullStr | Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks |
| title_full_unstemmed | Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks |
| title_short | Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks |
| title_sort | molybdenum isotope fingerprinting of microbial sulfate reduction in seep carbonate rocks |
| url | https://doi.org/10.1029/2023GC011379 |
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