{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"omics_type":["Unknown"],"volume":["3(1)"],"submitter":["Kaskes P"],"pubmed_abstract":["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 (δ<sup>18</sup>O), carbon (δ<sup>13</sup>C), and clumped-isotope (Δ<sub>47</sub>) 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 (<i>T</i>(Δ<sub>47</sub>)) 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 <i>T</i>(Δ<sub>47</sub>) of 111 ± 10°C (1 standard error [SE]), which likely traces the thermal processing of carbonate material during ejection. Finally, <i>T</i>(Δ<sub>47</sub>) 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 CO<sub>2</sub> to form secondary CaCO<sub>3</sub> phases. These observations have important climatic implications for the Cretaceous-Paleogene mass extinction event, as current numerical models likely overestimate the release of CO<sub>2</sub> from the Chicxulub impact event."],"journal":["PNAS nexus"],"pagination":["pgad414"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC10783646"],"repository":["biostudies-literature"],"pubmed_title":["Hot carbonates deep within the Chicxulub impact structure."],"pmcid":["PMC10783646"],"pubmed_authors":["Peral M","Kaskes P","Claeys P","Goderis S","Marchegiano M"],"additional_accession":[]},"is_claimable":false,"name":"Hot carbonates deep within the Chicxulub impact structure.","description":"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 (δ<sup>18</sup>O), carbon (δ<sup>13</sup>C), and clumped-isotope (Δ<sub>47</sub>) 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 (<i>T</i>(Δ<sub>47</sub>)) 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 <i>T</i>(Δ<sub>47</sub>) of 111 ± 10°C (1 standard error [SE]), which likely traces the thermal processing of carbonate material during ejection. Finally, <i>T</i>(Δ<sub>47</sub>) 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 CO<sub>2</sub> to form secondary CaCO<sub>3</sub> phases. These observations have important climatic implications for the Cretaceous-Paleogene mass extinction event, as current numerical models likely overestimate the release of CO<sub>2</sub> from the Chicxulub impact event.","dates":{"release":"2024-01-01T00:00:00Z","publication":"2024 Jan","modification":"2024-12-04T13:28:17.02Z","creation":"2024-12-04T13:28:17.02Z"},"accession":"S-EPMC10783646","cross_references":{"pubmed":["38213614"],"doi":["10.1093/pnasnexus/pgad414"]}}