Search for a meteoritic component within the impact melt rocks of the Chicxulub impact structure peak ring, Mexico

Jean-Guillaume Feignon, Toni Schulz, Ludovic Ferrière, Steven Goderis, Sietze J. de Graaff, Pim Kaskes, Thomas Déhais, Philippe Claeys, Christian Koeberl

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Constraining the degree of preservation of a meteoritic signature within an impact structure provides vital insights in the complex pathways and processes that occur during and after an impact cratering event, providing information on the fate of the projectile. The IODP-ICDP Expedition 364 drilling recovered a ∼829 m continuous core (M0077A) of impactites and basement rocks within the ∼200-km diameter Chicxulub impact structure peak ring. No highly siderophile element (HSE) data have been reported for any of the impact melt rocks of this drill core to date. Previous work has shown that most Chicxulub impactites contain less than 0.1% of a chondritic component. Only few impact melt rock samples in previous drill cores recovered from the Chicxulub might contain such a signal. Therefore, we analyzed impact melt rock and suevite samples, as well as pre-impact lithologies of the Chicxulub peak ring, with a focus on the HSE concentrations and Re–Os isotopic compositions. Similar to the concentrations of the other major and trace elements, those of the moderately siderophile elements (Cr, Co, Ni) of impact melt rock samples primarily reflect mixing between a mafic (dolerite) and felsic (granite) components, with the incorporation of carbonate material in the upper impact melt rock unit (from 715.60 to 747.02 meters below seafloor). The HSE concentrations of the impact melt rocks and suevites are generally low (
Originele taal-2English
Pagina's (van-tot)74-101
Aantal pagina's28
TijdschriftGeochimica et Cosmochimica Acta
Volume323
DOI's
StatusPublished - 15 apr 2022

Bibliografische nota

Funding Information:
This paper is dedicated to the memory of Günter W. Lugmair (1940–2021), for his pioneering work on isotopic analysis of the K–Pg boundary and in cosmochemistry in general. The Chicxulub drilling was funded by the IODP as Expedition 364, with co-funding from ICDP. Expedition 364 was implemented by ECORD, with contributions and logistical support from the Yucatán state government and Universidad Nacional Autónoma de México. Partial funding was provided by the University of Vienna doctoral school IK-1045 (P.I.: C.K.). We thank Peter Nagl and Marianne Schwarzinger for XRF sample preparation and analysis, and Dieter Mader for INAA and data processing. The AMGC team is supported by Research Foundation Flanders (FWO-Vlaanderen; project G0A6517N) and BELSPO (project Chicxulub); P.K. is an FWO PhD fellow (project 11E6619N; 11E6621N). S.G. and P.C. thank the EoS project “ET–HoME” for support and the VUB Strategic Research Program. P.C. thanks the FWO – Hercules Program for financing the μXRF instrument at the VUB. This is contribution 70 of the DFG-funded ICPMS facilities at the Steinmann-Institute, University of Bonn. We thank Martin Schmieder and an anonymous reviewer for detailed and constructive reviews, as well as Marc Norman for editorial handling.

Funding Information:
This paper is dedicated to the memory of Günter W. Lugmair (1940–2021), for his pioneering work on isotopic analysis of the K–Pg boundary and in cosmochemistry in general. The Chicxulub drilling was funded by the IODP as Expedition 364, with co-funding from ICDP. Expedition 364 was implemented by ECORD, with contributions and logistical support from the Yucatán state government and Universidad Nacional Autónoma de México. Partial funding was provided by the University of Vienna doctoral school IK-1045 (P.I.: C.K.). We thank Peter Nagl and Marianne Schwarzinger for XRF sample preparation and analysis, and Dieter Mader for INAA and data processing. The AMGC team is supported by Research Foundation Flanders (FWO-Vlaanderen; project G0A6517N) and BELSPO (project Chicxulub); P.K. is an FWO PhD fellow (project 11E6619N; 11E6621N). S.G. and P.C. thank the EoS project “ET--HoME” for support and the VUB Strategic Research Program. P.C. thanks the FWO -- Hercules Program for financing the μXRF instrument at the VUB. This is contribution 70 of the DFG-funded ICPMS facilities at the Steinmann-Institute, University of Bonn. We thank Martin Schmieder and an anonymous reviewer for detailed and constructive reviews, as well as Marc Norman for editorial handling.

Publisher Copyright:
© 2022 The Author(s)

Copyright:
Copyright 2022 Elsevier B.V., All rights reserved.

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