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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.
Originele taal-2 | English |
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Artikelnummer | pgad414 |
Pagina's (van-tot) | 1-14 |
Aantal pagina's | 14 |
Tijdschrift | PNAS Nexus |
Volume | 3 |
Nummer van het tijdschrift | 1 |
DOI's | |
Status | Published - 1 jan 2024 |
Bibliografische nota
Publisher Copyright:© The Author(s) 2024. Published by Oxford University Press on behalf of NAR Cancer.
Vingerafdruk
Duik in de onderzoeksthema's van 'Hot carbonates deep within the Chicxulub impact structure'. Samen vormen ze een unieke vingerafdruk.Onderzoekersoutput
- 3 Conference paper
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Clumped Isotope Analysis as a New Tool to Constrain Impact-Related Thermal Processes: A Case Study from the Chicxulub Impact Structure
Kaskes, P., Marchegiano, M., Peral, M. Y., Goderis, S. & Claeys, P., 1 aug 2024, 86th Annual Meeting of the Meteoritical Society (2024): Abstracts. Meteoritical Society, Tucson, Arizona, USA, Vol. 59. blz. 1-1 1 blz.Onderzoeksoutput: Conference paper
Open AccessBestand -
Reduced CO2 release from the Chicxulub impact event as inferred from carbonate clumped isotope thermometry on crater impactites
Kaskes, P., Marchegiano, M., Peral, M. Y., Goderis, S., Mattielli, N. & Claeys, P., 23 sep 2024, Geological Society of America Abstracts with Programs. 5 redactie Geological Society of America, Vol. 56. blz. 1-1 1 blz.Onderzoeksoutput: Conference paper
Open Access -
Hot carbonates deep within the Chicxulub impact structure as revealed by clumped isotope thermometry
Kaskes, P., Marchegiano, M., Peral, M. Y., Goderis, S. & Claeys, P., 13 jul 2023, Goldschmidt 2023 Conference Lyon - Abstracts. European Association of Geochemistry, blz. 1-1 1 blz.Onderzoeksoutput: Conference paper
Open AccessBestand
Uitrusting
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Nu-Instruments IS-Perspective Isotope Ratio Mass Spectrometer
Philippe Claeys (Manager)
Archeologie, Milieuveranderingen, en Geo-ChemieUitrusting/faciliteit: no e-resource/single sited