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dc.rights.licenseopenen_US
dc.contributor.authorKASKES, Pim
dc.contributor.authorMARCHEGIANO, Marta
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorPERAL, Marion
dc.contributor.authorGODERIS, Steven
dc.contributor.authorCLAEYS, Philippe
dc.date.accessioned2025-02-26T15:36:51Z
dc.date.available2025-02-26T15:36:51Z
dc.date.issued2024-01-11
dc.identifier.issn2752-6542en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/205222
dc.description.abstractAbstract Constraining the thermodynamic conditions within an impact structure during and after hypervelocity impacts is extremely challenging due to the transient thermal regimes. This work uses carbonate clumped-isotope thermometry to reconstruct absolute temperatures of impact lithologies within and close to the ∼66 Myr old Chicxulub crater (Yucatán, México). We present stable oxygen (δ18O), carbon (δ13C), and clumped-isotope (Δ47) data for carbonate-bearing impact breccias, impact melt rock, and target lithologies from four drill cores on a transect through the Chicxulub structure from the northern peak ring to the southern proximal ejecta blanket. Clumped isotope-derived temperatures (T(Δ47)) are consistently higher than maximum Late Cretaceous sea surface temperatures (35.5°C), except in the case of Paleogene limestones and melt-poor impact breccias outside of the crater, confirming the influence of burial diagenesis and a widespread and long-lived hydrothermal system. The melt-poor breccia unit outside the crater is overlain by melt-rich impact breccia yielding a much higher T(Δ47) of 111 ± 10°C (1 standard error [SE]), which likely traces the thermal processing of carbonate material during ejection. Finally, T(Δ47) up to 327 ± 33°C (1 SE) is determined for the lower suevite and impact melt rock intervals within the crater. The highest temperatures are related to distinct petrological features associated with decarbonation and rapid back-reaction, in which highly reactive CaO recombines with impact-released CO2 to form secondary CaCO3 phases. These observations have important climatic implications for the Cretaceous–Paleogene mass extinction event, as current numerical models likely overestimate the release of CO2 from the Chicxulub impact event.
dc.language.isoENen_US
dc.rightsAttribution 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/*
dc.subject.enclumped isotopes
dc.subject.enChicxulub
dc.subject.endecarbonation
dc.subject.enback-reaction
dc.subject.enimpactites
dc.titleHot carbonates deep within the Chicxulub impact structure
dc.typeArticle de revueen_US
dc.identifier.doi10.1093/pnasnexus/pgad414en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalPNAS Nexusen_US
bordeaux.volume3en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue1en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamPALEOen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcecrossref
hal.identifierhal-04968193
hal.version1
hal.date.transferred2025-02-26T15:36:54Z
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exporttrue
workflow.import.sourcecrossref
dc.rights.ccCC BYen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.title=Hot%20carbonates%20deep%20within%20the%20Chicxulub%20impact%20structure&rft.atitle=Hot%20carbonates%20deep%20within%20the%20Chicxulub%20impact%20structure&rft.jtitle=PNAS%20Nexus&rft.date=2024-01-11&rft.volume=3&rft.issue=1&rft.eissn=2752-6542&rft.issn=2752-6542&rft.au=KASKES,%20Pim&MARCHEGIANO,%20Marta&PERAL,%20Marion&GODERIS,%20Steven&CLAEYS,%20Philippe&rft.genre=article


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