Iron minerals within specific microfossil ...
Document type :
Article dans une revue scientifique: Article original
DOI :
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Title :
Iron minerals within specific microfossil morphospecies of the 1.88 Ga Gunflint Formation
Author(s) :
Lepot, Kevin [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Addad, Ahmed [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Knoll, Andrew H. [Auteur]
Department of Organismic and Evolutionary Biology [Cambridge] [OEB]
Wang, Jian [Auteur]
University of Saskatchewan [Saskatoon, Canada] [U of S]
Troadec, david [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Béché, Armand [Auteur]
Electron Microscopy for Materials Science - EMAT (Antwerp, Belgium)
Javaux, Emmanuelle J. [Auteur]
Département de Géologie [Liège]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Addad, Ahmed [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Knoll, Andrew H. [Auteur]
Department of Organismic and Evolutionary Biology [Cambridge] [OEB]
Wang, Jian [Auteur]
University of Saskatchewan [Saskatoon, Canada] [U of S]
Troadec, david [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Béché, Armand [Auteur]
Electron Microscopy for Materials Science - EMAT (Antwerp, Belgium)
Javaux, Emmanuelle J. [Auteur]
Département de Géologie [Liège]
Journal title :
Nature communications
Volume number :
8
Pages :
14890
Publisher :
Nature Publishing Group
Publication date :
2017
ISSN :
2041-1723
HAL domain(s) :
Planète et Univers [physics]
English abstract : [en]
Problematic microfossils dominate the palaeontological record between the Great Oxidation Event 2.4 billion years ago (Ga) and the last Palaeoproterozoic iron formations, deposited 500-600 million years later. These fossils ...
Show more >Problematic microfossils dominate the palaeontological record between the Great Oxidation Event 2.4 billion years ago (Ga) and the last Palaeoproterozoic iron formations, deposited 500-600 million years later. These fossils are often associated with iron-rich sedimentary rocks, but their affinities, metabolism, and, hence, their contributions to Earth surface oxidation and Fe deposition remain unknown. Here we show that specific microfossil populations of the 1.88 Ga Gunflint Iron Formation contain Fe-silicate and Fe-carbonate nanocrystal concentrations in cell interiors. Fe minerals are absent in/on all organically preserved cell walls. These features are consistent with in vivo intracellular Fe biomineralization, with subsequent in situ recrystallization, but contrast with known patterns of post-mortem Fe mineralization. The Gunflint populations that display relatively large cells (thick-walled spheres, filament-forming rods) and intra-microfossil Fe minerals are consistent with oxygenic photosynthesizers but not with other Fe-mineralizing microorganisms studied so far. Fe biomineralization may have protected oxygenic photosynthesizers against Fe<SUP>2+</SUP> toxicity during the Palaeoproterozoic.Show less >
Show more >Problematic microfossils dominate the palaeontological record between the Great Oxidation Event 2.4 billion years ago (Ga) and the last Palaeoproterozoic iron formations, deposited 500-600 million years later. These fossils are often associated with iron-rich sedimentary rocks, but their affinities, metabolism, and, hence, their contributions to Earth surface oxidation and Fe deposition remain unknown. Here we show that specific microfossil populations of the 1.88 Ga Gunflint Iron Formation contain Fe-silicate and Fe-carbonate nanocrystal concentrations in cell interiors. Fe minerals are absent in/on all organically preserved cell walls. These features are consistent with in vivo intracellular Fe biomineralization, with subsequent in situ recrystallization, but contrast with known patterns of post-mortem Fe mineralization. The Gunflint populations that display relatively large cells (thick-walled spheres, filament-forming rods) and intra-microfossil Fe minerals are consistent with oxygenic photosynthesizers but not with other Fe-mineralizing microorganisms studied so far. Fe biomineralization may have protected oxygenic photosynthesizers against Fe<SUP>2+</SUP> toxicity during the Palaeoproterozoic.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
ISEN
Univ. Valenciennes
ENSCL
CNRS
INRA
Institut Catholique Lille
Centrale Lille
Univ. Littoral Côte d’Opale
ISEN
Univ. Valenciennes
ENSCL
CNRS
INRA
Institut Catholique Lille
Centrale Lille
Univ. Littoral Côte d’Opale
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Submission date :
2019-05-16T17:21:23Z
2023-10-18T07:58:49Z
2023-10-18T07:58:49Z
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