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Globally distributed iridium layer preserved within the Chicxulub impact structure.

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  • معلومة اضافية
    • Contributors:
      Natural Environment Research Council (NERC)
    • بيانات النشر:
      American Association for the Advancement of Science
    • الموضوع:
      2021
    • Collection:
      Imperial College London: Spiral
    • الموضوع:
      United States
    • نبذة مختصرة :
      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.
    • ISSN:
      2375-2548
    • Relation:
      Science Advances; http://hdl.handle.net/10044/1/86827; NE/P005217/1
    • الرقم المعرف:
      10.1126/sciadv.abe3647
    • الدخول الالكتروني :
      http://hdl.handle.net/10044/1/86827
      https://doi.org/10.1126/sciadv.abe3647
    • Rights:
      © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. ; http://creativecommons.org/licenses/by-nc/4.0/
    • الرقم المعرف:
      edsbas.AECAF4F2