Titel
Globally distributed iridium layer preserved within the Chicxulub impact structure
Autor*in
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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 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.
Stichwort
Multidisciplinary
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
phaidra.univie.ac.at/o:1622267
Erschienen in
Titel
Science Advances
Band
7
Ausgabe
9
ISSN
2375-2548
Erscheinungsdatum
2021
Publication
American Association for the Advancement of Science (AAAS)
Erscheinungsdatum
2021
Zugänglichkeit
Rechte
Rechteangabe
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