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Significant Impact of Hydrothermalism on the Biogeochemical Signature of Sinking and Sedimented Particles in the Lau Basin

dc.rights.licenseopenen_US
hal.structure.identifierLaboratoire d'océanographie de Villefranche [LOV]
dc.contributor.authorTILLIETTE, Chloé
hal.structure.identifierLaboratoire d'océanographie de Villefranche [LOV]
dc.contributor.authorGAZEAU, Frédéric
hal.structure.identifierGéosciences Environnement Toulouse [GET]
dc.contributor.authorCHAVAGNAC, Valérie
hal.structure.identifierInstitut de la Mer de Villefranche [IMEV]
dc.contributor.authorLEBLOND, Nathalie
hal.structure.identifierLaboratoire d'océanographie de Villefranche [LOV]
dc.contributor.authorMONTANES, Maryline
hal.structure.identifierInstitut méditerranéen d'océanologie [MIO]
dc.contributor.authorLEBLANC, Karine
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSCHMIDT, Sabine
IDREF: 131836129
hal.structure.identifierCentre de Formation et de Recherche sur les Environnements Méditérranéens [CEFREM]
dc.contributor.authorCHARRIÈRE, Bruno
hal.structure.identifierMediterranean Institute of Oceanography [Marseille, France]
dc.contributor.authorBHAIRY, Nagib
hal.structure.identifierLaboratoire d'océanographie de Villefranche [LOV]
dc.contributor.authorGUIEU, Cécile
dc.date.accessioned2024-02-05T12:32:08Z
dc.date.available2024-02-05T12:32:08Z
dc.date.issued2023-11-30
dc.identifier.issn2169-9275en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/187812
dc.description.abstractEnAbstract Iron (Fe) is an essential micronutrient for diazotrophs, which are abundant in the Western Tropical South Pacific Ocean (WTSP). Their success depends on the numerous trace metals, particularly Fe, released from shallow hydrothermal vents along the Tonga Arc. This study aimed to explore the spatio‐temporal impact of hydrothermal fluids on particulate trace metal concentrations and biological activity. To identify the composition of sinking particles across a wide area of the WTSP, we deployed sediment traps at various depths, both close and further west of the Tonga Arc. Seafloor sediments were cored at these deployment sites, including at a remote location in the South Pacific Gyre. The sinking particles were composed of a large amount of biological material (up to 88 mg d −1 ), indicative of the high productivity of the region. A significant portion of this material (∼21 ± 12 wt.%) was lithogenic of hydrothermal origin, as revealed through Al‐Fe‐Mn tracing. The sinking material showed similar patterns between lithogenic and biogenic fractions, indicating that hydrothermal input within the photic layer triggered surface production. A hydrothermal fingerprint was suggested in the sediments due to the high sedimentation rates (>47 cm kyr −1 ) and the presence of large, heterogeneous, metal‐rich particles. The presence of nearby active deep hydrothermal sources was suspected near the Lau Ridge due to the large particle size (1–976 μm) and the significant excess of Fe and Mn (2–20 wt.%). Overall, this study revealed that hydrothermal sources have a significant influence on the biogeochemical signature of particles in the region.
dc.description.sponsorshipApports d'éléments traces issus de sources hydrothermales peu profondes: impact potentiel sur la productivité marine et la pompe biologique à carbone - ANR-18-CE01-0016en_US
dc.language.isoENen_US
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enSignificant Impact of Hydrothermalism on the Biogeochemical Signature of Sinking and Sedimented Particles in the Lau Basin
dc.typeArticle de revueen_US
dc.identifier.doi10.1029/2023JC019828en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalJournal of Geophysical Research. Oceansen_US
bordeaux.volume128en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue12en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamGEOLSEDen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-04320412
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccCC BYen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Geophysical%20Research.%20Oceans&rft.date=2023-11-30&rft.volume=128&rft.issue=12&rft.eissn=2169-9275&rft.issn=2169-9275&rft.au=TILLIETTE,%20Chlo%C3%A9&GAZEAU,%20Fr%C3%A9d%C3%A9ric&CHAVAGNAC,%20Val%C3%A9rie&LEBLOND,%20Nathalie&MONTANES,%20Maryline&rft.genre=article


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