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dc.rights.licenseopenen_US
dc.contributor.authorFAGEL, Nathalie
dc.contributor.authorPEDREROS, Pablo
dc.contributor.authorÁLVAREZ, Denisse
dc.contributor.authorISRADE ALCANTARA, Isabel
dc.contributor.authorVEGA ALAY, Ignacio
dc.contributor.authorNAMUR, Olivier
dc.contributor.authorARANEDA, Alberto
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSCHMIDT, Sabine
IDREF: 131836129
dc.contributor.authorLEPOINT, Gilles
dc.contributor.authorURRUTIA, Roberto
dc.date.accessioned2024-03-13T10:31:33Z
dc.date.available2024-03-13T10:31:33Z
dc.date.issued2023-05
dc.identifier.issn0959-6836en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/188770
dc.description.abstractEnThe environmental variability of Northern Chilean Patagonia during the last millennia is evaluated using a multi-proxy analysis of sediment cores from Lake Esponja (45°S 72°W) to decipher if the sediment deposition is controlled by volcanic eruptions, landslides induced by earthquake or heavy rainfall. The lake is located in a glacio-tectonic valley in Patagonia. The organic-rich clayey silt sediment with low biogenic silica content was analysed for grain size, magnetic susceptibility, organic matter, biogenic silica content and diatom assemblages, mineralogy (X-ray diffraction), organic (IRMS C and N analyses) and inorganic (XRF core-scanner) geochemistry and glass shard major composition (Microprobe, SEM). The combination of 210 Pb, 137 Cs, 14 C and tephrochronology indicates an averaged accumulation rate of 0.4 mm/year, leading to a record of ~3.5 kyr within 154 cm. The sedimentary geochemistry records changes in volcanic supplies, diatom productivity and detrital inputs. The sediments were interrupted by millimetric to centimetric layers corresponding to tephra deposition related to explosive eruptions of nearby volcanoes Macá, Melimoyu and Hudson. Concerning the diatoms, the dominant planktonic species (80–150 cm) are replaced by benthic species in a transition interval (55–80 cm) and then by Surirella spp. in the upper core. This last genus indicates a closure of the basin ~2 ka ago, probably related to an uplift linked to a rejuvenation of the Mañihuales fault. This local change could reflect regional tectonic instability. Indeed, a partial earthquake rupture occurred around ~AD100 along the southern part of the Valdivia segment, recorded as a mass transport deposit in Aysén fjord sedimentation. The fine detrital input varies over time with more variable Si/Al values in the lower part of the LEs14 core than in the upper 80 cm. The higher values may reflect wetter conditions, leading to an higher lake level and more turbid conditions in agreement with changes in diatom assemblages.
dc.language.isoENen_US
dc.subject.enLacustrine sediment
dc.subject.ensedimentary geochemistry
dc.subject.endiatom assemblages
dc.subject.entephra
dc.subject.enLate Holocene
dc.subject.enChile
dc.title.enVolcanic, tectonic and climate controls on lacustrine sedimentary supplies over the last millenia in NE Chilean Patagonia (Lake Esponja, Aysen, 45°S)
dc.typeArticle de revueen_US
dc.identifier.doi10.1177/09596836231151828en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalThe Holoceneen_US
bordeaux.page518-535en_US
bordeaux.volume33en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue5en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamGEOLSEDen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-04252549
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The%20Holocene&rft.date=2023-05&rft.volume=33&rft.issue=5&rft.spage=518-535&rft.epage=518-535&rft.eissn=0959-6836&rft.issn=0959-6836&rft.au=FAGEL,%20Nathalie&PEDREROS,%20Pablo&%C3%81LVAREZ,%20Denisse&ISRADE%20ALCANTARA,%20Isabel&VEGA%20ALAY,%20Ignacio&rft.genre=article


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