Volume 13 Issue 5
Sep.  2022
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Thomas Déhais, Stepan M. Chernonozhkin, Pim Kaskes, Sietze J. de Graaff, Vinciane Debaille, Frank Vanhaecke, Philippe Claeys, Steven Goderis. Resolving impact volatilization and condensation from target rock mixing and hydrothermal overprinting within the Chicxulub impact structure[J]. Geoscience Frontiers, 2022, 13(5): 101410. doi: 10.1016/j.gsf.2022.101410
Citation: Thomas Déhais, Stepan M. Chernonozhkin, Pim Kaskes, Sietze J. de Graaff, Vinciane Debaille, Frank Vanhaecke, Philippe Claeys, Steven Goderis. Resolving impact volatilization and condensation from target rock mixing and hydrothermal overprinting within the Chicxulub impact structure[J]. Geoscience Frontiers, 2022, 13(5): 101410. doi: 10.1016/j.gsf.2022.101410

Resolving impact volatilization and condensation from target rock mixing and hydrothermal overprinting within the Chicxulub impact structure

doi: 10.1016/j.gsf.2022.101410

n State Government and the National Autonomous University of Mexico.

project G0A6517N), the Belgian Federal Science Policy Office (BELSPO

project Chicxulub), the Excellence of Science Program (EoS project ET-HoME ID 30442502), and the VUB Strategic Research Program. Pim Kaskes thanks FWO for the personal PhD fellowship awarded (projects 11E6619N, 11E6621N). Vinciane Debaille thanks the Fonds de la Recherche Scientifique (FRS-FNRS) for support. Stepan Chernonozhkin acknowledges his postdoctoral fellowship from the FWO EoS project ET-HoME. The FWO is acknowledged for providing the funding for the acquisition of the MC-ICP-MS instrumentation (ZW15-02-G0H6216N). Frank Vanhaecke acknowledges the support from FWO under the form of the aforementioned EoS project and BOF-UGent. This study used samples provided by IODP-ICDP Expedition 364, which was jointly funded by the International Ocean Discovery Program and the International Continental Scientific Drilling Program, with contributions and logistical support from the Yucatá

The authors thank the valuable comments made by Ryan Mathur, Lucy McGee, and a third anonymous reviewer as well as associate editor Stijn Glorie that helped to improve this manuscript. We warmly thank Wendy Debouge, Sabrina Cauchies, and Jeroen de Jong for their assistance with the sample preparation and the ICP-OES, ICP-MS and MC-ICP-MS analysis at Laboratoire G-Time (Université

Libre de Bruxelles). This work is supported by the Research Foundation Flanders (FWO

  • Received Date: 2022-01-06
  • Accepted Date: 2022-05-19
  • Rev Recd Date: 2022-05-07
  • Publish Date: 2022-05-23
  • This work presents isotopic data for the non-traditional isotope systems Fe, Cu, and Zn on a set of Chicxulub impactites and target lithologies with the aim of better documenting the dynamic processes taking place during hypervelocity impact events, as well as those affecting impact structures during the post-impact phase. The focus lies on material from the recent IODP-ICDP Expedition 364 Hole M0077A drill core obtained from the offshore Chicxulub peak ring. Two ejecta blanket samples from the UNAM 5 and 7 cores were used to compare the crater lithologies with those outside of the impact structure. The datasets of bulk Fe, Cu, and Zn isotope ratios are coupled with petrographic observations and bulk major and trace element compositions to disentangle equilibrium isotope fractionation effects from kinetic processes. The observed Fe and Cu isotopic signatures, with δ56/54Fe ranging from -0.95‰ to 0.58‰ and δ65/63Cu from -0.73‰ to 0.14‰, mostly reflect felsic, mafic, and carbonate target lithology mixing and secondary sulfide mineral formation, the latter associated to the extensive and long-lived (>105 years) hydrothermal system within Chicxulub structure. On the other hand, the stable Zn isotope ratios provide evidence for volatility-governed isotopic fractionation. The heavier Zn isotopic compositions observed for the uppermost part of the impactite sequence and a metamorphic clast (δ66/64Zn of up to 0.80‰ and 0.87‰, respectively) relative to most basement lithologies and impact melt rock units indicate partial vaporization of Zn, comparable to what has been observed for Cretaceous-Paleogene boundary layer sediments around the world, as well as for tektites from various strewn fields. In contrast to previous work, our data indicate that an isotopically light Zn reservoir (δ66/64Zn down to -0.49‰), of which the existence has previously been suggested based on mass balance considerations, may reside within the upper impact melt rock (UIM) unit. This observation is restricted to a few UIM samples only and cannot be extended to other target or impact melt rock units. Light isotopic signatures of moderately volatile elements in tektites and microtektites have previously been linked to (back-)condensation under distinct kinetic regimes. Although some of the signatures observed may have been partially overprinted during post-impact processes, our bulk data confirm impact volatilization and condensation of Zn, which may be even more pronounced at the microscale, with variable degrees of mixing between isotopically distinct reservoirs, not only at proximal to distal ejecta sites, but also within the lithologies associated with the Chicxulub impact crater.
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