Characterization of shocked quartz grains from Chicxulub peak ring granites and shock pressure estimates

Jean-Guillaume Feignon, Ludovic Ferrière, Hugues Leroux, Christian Koeberl

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11 Citaten (Scopus)

Samenvatting

Planar deformation features (PDFs) in quartz are a commonly used and well-documented indicator of shock metamorphism in terrestrial rocks. The measurement of PDF orientations provides constraints on the shock pressure experienced by a rock sample. A total of 963 PDF sets were measured in 352 quartz grains in 11 granite samples from the basement of the Chicxulub impact structure’s peak ring (IODP-ICDP Expedition 364 drill core), with the aim to quantify the shock pressure distribution and a possible decay of the recorded shock pressure with depth, in the attempt to better constrain shock wave propagation and attenuation within a peak ring. The investigated quartz grains are highly shocked (99.8% are shocked), with an average of 2.8 PDF sets per grain; this is significantly higher than in all previously investigated drill cores recovered from Chicxulub and also for most K-Pg boundary samples (for which shocked quartz data are available). PDF orientations are roughly homogenous from a sample to another sample and mainly parallel to {1013} and {1014} orientations (these two orientations representing on average 68.6% of the total), then to {1012} orientation, known to form at higher shock pressure. Our shock pressure estimates are within a narrow range, between ~16 and 18 GPa, with a slight shock attenuation with increasing depth in the drill core. The relatively high shock pressure estimates, coupled with the rare occurrence of basal PDFs, i.e., parallel to the (0001) orientation, suggest that the granite basement in the peak ring could be one of the sources of the shocked quartz grains found in the most distal K-Pg boundary sites.
Originele taal-2English
Pagina's (van-tot)2206-2223
Aantal pagina's18
TijdschriftMeteoritics & Planetary Science
Volume55
Nummer van het tijdschrift10
DOI's
StatusPublished - 2 okt 2020
Extern gepubliceerdJa

Bibliografische nota

Funding Information:
This paper is dedicated to the memory of Bruce F. Bohor (1932–2019), who first described the occurrence of shocked quartz grains in the Cretaceous–Paleogene boundary layer. 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.). H.L. thanks the Renatech platform and David Troadec for the FIB preparation. The TEM facility in Lille (France) is supported by the Conseil Régional du Nord‐Pas‐de‐Calais, and the European Regional Development Fund (ERDF). A. Rae and L. Pittarello are acknowledged for interesting discussions based on limited U‐stage data they have also obtained for a few samples from the IODP‐ICDP Expedition 364. We thank C. Alwmark and M. Schmieder for constructive reviews and J. Plescia for editorial handling.

Funding Information:
This paper is dedicated to the memory of Bruce F. Bohor (1932–2019), who first described the occurrence of shocked quartz grains in the Cretaceous–Paleogene boundary layer. 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.). H.L. thanks the Renatech platform and David Troadec for the FIB preparation. The TEM facility in Lille (France) is supported by the Conseil Régional du Nord-Pas-de-Calais, and the European Regional Development Fund (ERDF). A. Rae and L. Pittarello are acknowledged for interesting discussions based on limited U-stage data they have also obtained for a few samples from the IODP-ICDP Expedition 364. We thank C. Alwmark and M. Schmieder for constructive reviews and J. Plescia for editorial handling.

Publisher Copyright:
© 2020 The Authors. Meteoritics & Planetary Science published by Wiley Periodicals LLC on behalf of The Meteoritical Society (MET)

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

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