{"refrec":{"BRefID":391422,"RR":"<b>Kaskes, P.; Marchegiano, M.; Peral, M.; Goderis, S.; Claeys, P.</b> (2024). Hot carbonates deep within the Chicxulub impact structure. <i>PNAS Nexus 3(1)</i>: pgad414. <a href=\"https://dx.doi.org/10.1093/pnasnexus/pgad414\" target=\"_blank\">https://dx.doi.org/10.1093/pnasnexus/pgad414</a>","BEntID":389169,"PublicFlag":1,"CheckedFlag":1,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>PNAS Nexus 3(1)</i>: pgad414. <a href=\"https://dx.doi.org/10.1093/pnasnexus/pgad414\" target=\"_blank\">https://dx.doi.org/10.1093/pnasnexus/pgad414</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Kaskes, P.; Marchegiano, M.; Peral, M.; Goderis, S.; Claeys, P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Kaskes, P. <i>et al.</i>","Englishabstract":"<p style=\"margin-left:0px;\">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.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Hot carbonates deep within the Chicxulub impact structure","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"clumped isotopes; Chicxulub; decarbonation; back-reaction; impactites","OtherDescriptors":null,"Notes":null,"AnaPub":2024,"MonPub":null,"DateUpdate":"2024-04-06","DateCreate":"2024-03-26","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:001141909800002","VABBcode":null,"OpenAcc":1,"DOI":"10.1093/pnasnexus/pgad414"},"refs":null,"anarec":{"AnaID":391422,"PubliDate":2024,"Pagination":"pgad414","XtraPublOfAnaID":null,"ISBN":null,"Volume":"3","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":363439,"SerRR":"PNAS Nexus. 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