Globally distributed iridium layer preserved within the Chicxulub impact structure
Goderis, S.; Sato, H.; Ferrière, L.; Schmitz, B.; Burney, D.; Kaskes, P.; Vellekoop, J.; Wittmann, A.; Schulz, T.; Chernonozhkin, S.M.; Claeys, P.; de Graaff, S.J.; Déhais, T.; de Winter, N.J.; Elfman, M.; Feignon, J.-G.; Ishikawa, A.; Koeberl, C.; Kristiansson, P.; Neal, C.R.; Owens, J.D.; Schmieder, M.; Sinnesael, M.; Vanhaecke, F.; van Malderen, S.J.M.; Bralower, T.J.; Gulick, S.P.S.; Kring, D.A.; Lowery, C.M.; Morgan, J.V.; Smit, J.; Whalen, M.T.
(2021) Science advances, volume 7, issue 9, pp. 1 - 14
(Article)
Abstract
The Cretaceous-Paleogene (K-Pg) mass extinction is marked globally by elevated concentrations of iridium, emplaced by a hypervelocity impact event 66 million years ago. Here, we report new data from four independent laboratories that reveal a positive iridium anomaly within the peak-ring sequence of the Chicxulub impact structure, in drill core
... read more
recovered by IODP-ICDP Expedition 364. The highest concentration of ultrafine meteoritic matter occurs in the post-impact sediments that cover the crater peak ring, just below the lowermost Danian pelagic limestone. Within years to decades after the impact event, this part of the Chicxulub impact basin returned to a relatively low-energy depositional environment, recording in unprecedented detail the recovery of life during the succeeding millennia. The iridium layer provides a key temporal horizon precisely linking Chicxulub to K-Pg boundary sections worldwide.
show less
Download/Full Text
ISSN: 2375-2548
Publisher: American Association for the Advancement of Science
Note: Publisher Copyright: Copyright © 2021 The Authors, some rights reserved.
(Peer reviewed)
See more statistics about this item
