Pyrite morphology and sulfur isotopes refine taphonomic models for the 2.1 Ga Francevillian biota, Gabon
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| Název: | Pyrite morphology and sulfur isotopes refine taphonomic models for the 2.1 Ga Francevillian biota, Gabon |
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| Autoři: | El Khoury, Anna, Saleh, Farid, El Albani, Abderrazak, Fontaine, Claude, Rollion-Bard, Claire, Chraiki, Ibtissam, Aubineau, Jérémie, Ngwal’ghoubou Ikouanga, Julie, Bhilisse, Mohamed, Zguaid, Maryem, Somogyi, Andrea, Chi Fru, Ernest |
| Přispěvatelé: | Institut de chimie des milieux et matériaux de Poitiers UMR 7285 (IC2MP Poitiers ), Université de Poitiers = University of Poitiers (UP)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Institut des sciences de la terre Lausanne (ISTE), Université de Lausanne = University of Lausanne (UNIL), Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Paléocéanographie (PALEOCEAN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Géosciences Environnement Toulouse (GET), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Cadi Ayyad University, Faculty of Sciences Semlalia, Department of Mathematics, BP 23 90, Marrakech, Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris Sciences et Lettres (PSL), Cardiff University, Synchrotron Soleil. Région Nouvelle Aquitaine (DEE21-28-2022-22881020). European Research Council (ERC) Seventh Framework (F7) program, grant No: 336092. SNF Ambizione Grant (PZ00P2_209102)., ANR-18-EURE-0010,INTREE,Poitiers Graduate School on physico-chemical properties of INTerfaces for AeRonautic, Energy and Environment(2018) |
| Zdroj: | ISSN: 2045-2322. |
| Informace o vydavateli: | CCSD Nature Publishing Group |
| Rok vydání: | 2025 |
| Sbírka: | MINES ParisTech: Archive ouverte / Open Archive (HAL) |
| Témata: | MESH: Biota, MESH: Fossils, MESH: Gabon, MESH: Geologic Sediments / chemistry, MESH: Iron* / analysis, MESH: Iron* / chemistry, MESH: Microscopy, Electron, Scanning, MESH: Sulfides* / analysis, MESH: Sulfides* / chemistry, MESH: Sulfur Isotopes* / analysis, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment |
| Popis: | International audience ; Pyritization is a key taphonomic process that preserves some of Earth's oldest fossils. It is influenced by various factors such as organic matter type, the availability of iron and sulfur, and sedimentation rates. In this study, we analyzed pyritized biotic and abiotic structures from 2.1 Ga deposits in Gabon's Francevillian Basin, to reconstruct their taphonomic pathway at the micron scale. Using secondary ion mass spectrometry and scanning electron microscopy, we examine sulfur isotope compositions, pyrite morphology and grain size within individual fossils and compare them to abiotic pyritic concretions from the same stratigraphic level. Our results reveal differences in pyrite grain size and sulfur isotope composition between fossils and concretions. More importantly, chemical and morphological variations are observed within individual fossils, likely due to distinct reactive environments for pyrite mineralization, linked to organic matter, sulfate and iron availability during early diagenesis. This remarkable variation in pyrite morphology and δ 34 S values in the fossilized specimens, indicates that they were compositionally more complex than the substrate that formed the homogeneously pyritized concretions. This well-preserved ecological window represents an exceptional record of the earliest multicellular life forms on Earth. |
| Druh dokumentu: | article in journal/newspaper |
| Jazyk: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/pmid/40473672; PUBMED: 40473672; PUBMEDCENTRAL: PMC12141565 |
| DOI: | 10.1038/s41598-025-04512-4 |
| Dostupnost: | https://hal.science/hal-05120938 https://hal.science/hal-05120938v1/document https://hal.science/hal-05120938v1/file/s41598-025-04512-4.pdf https://doi.org/10.1038/s41598-025-04512-4 |
| Rights: | info:eu-repo/semantics/OpenAccess |
| Přístupové číslo: | edsbas.969960B7 |
| Databáze: | BASE |
Nájsť tento článok vo Web of Science | Abstrakt: | International audience ; Pyritization is a key taphonomic process that preserves some of Earth's oldest fossils. It is influenced by various factors such as organic matter type, the availability of iron and sulfur, and sedimentation rates. In this study, we analyzed pyritized biotic and abiotic structures from 2.1 Ga deposits in Gabon's Francevillian Basin, to reconstruct their taphonomic pathway at the micron scale. Using secondary ion mass spectrometry and scanning electron microscopy, we examine sulfur isotope compositions, pyrite morphology and grain size within individual fossils and compare them to abiotic pyritic concretions from the same stratigraphic level. Our results reveal differences in pyrite grain size and sulfur isotope composition between fossils and concretions. More importantly, chemical and morphological variations are observed within individual fossils, likely due to distinct reactive environments for pyrite mineralization, linked to organic matter, sulfate and iron availability during early diagenesis. This remarkable variation in pyrite morphology and δ 34 S values in the fossilized specimens, indicates that they were compositionally more complex than the substrate that formed the homogeneously pyritized concretions. This well-preserved ecological window represents an exceptional record of the earliest multicellular life forms on Earth. |
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| DOI: | 10.1038/s41598-025-04512-4 |