TRUONG, Chloé; BERNARD, Sylvain; MORIN, Guillaume; LE PAPE, Pierre; BAYA, Camille; MERROT, Pauline; GORLAS, Aurore; GUYOT, François

doi:10.3389/fmicb.2023.1145781

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TRUONG, Chloé
Research On Carbon-rich Key Samples [IMPMC] [IMPMC_ROCKS]

BERNARD, Sylvain
Research On Carbon-rich Key Samples [IMPMC] [IMPMC_ROCKS]

MORIN, Guillaume
Minéralogie Environnementale [IMPMC] [IMPMC_MINENV]

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Article de revue

Ce document a été publié dans

Frontiers in Microbiology. 2023-05-25, vol. 14

Résumé en anglais

Thermococcales, a major order of hyperthermophilic archaea inhabiting iron- and sulfur-rich anaerobic parts of hydrothermal deep-sea vents, are known to induce the formation of iron phosphates, greigite (Fe 3 S 4 ) and abundant quantities of pyrite (FeS 2 ), including pyrite spherules. In the present study, we report the characterization of the sulfide and phosphate minerals produced in the presence of Thermococcales using X-ray diffraction, synchrotron-based X ray absorption spectroscopy and scanning and transmission electron microscopies. Mixed valence Fe(II)-Fe(III) phosphates are interpreted as resulting from the activity of Thermococcales controlling phosphorus–iron–sulfur dynamics. The pyrite spherules (absent in abiotic control) consist of an assemblage of ultra-small nanocrystals of a few ten nanometers in size, showing coherently diffracting domain sizes of few nanometers. The production of these spherules occurs via a sulfur redox swing from S 0 to S –2 and then to S –1 , involving a comproportionation of (-II) and (0) oxidation states of sulfur, as supported by S-XANES data. Importantly, these pyrite spherules sequester biogenic organic compounds in small but detectable quantities, possibly making them good biosignatures to be searched for in extreme environments.< Réduire

Mots clés en anglais

archaea biosignatures hydrothermal vents pyrite greigite

archaea

biosignatures

hydrothermal vents

pyrite

greigite

URI

https://oskar-bordeaux.fr/handle/20.500.12278/187498

DOI

http://dx.doi.org/10.3389/fmicb.2023.1145781

Project ANR

Les HYPERthermophiles et leur mécanisme de BIOMINeralisation - ANR-20-CE02-0001

Unités de recherche

EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805