Prolonged 187Os/188Os excursion implies hydrothermal influence after the Chicxulub impact in the Gulf of Mexico

Honami Sato (), Akira Ishikawa, Ignacio Arenillas, José A. Arz, Vicente Gilabert, Philippe Claeys, Steven Goderis, Christopher M. Lowery, Sean P. S. Gulick and Joanna V. Morgan
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Honami Sato: Kyushu University
Akira Ishikawa: Japan Agency for Marine-Earth Science and Technology
Ignacio Arenillas: Universidad de Zaragoza
José A. Arz: Universidad de Zaragoza
Vicente Gilabert: Universidad de Zaragoza
Philippe Claeys: Vrije Universiteit Brussel
Steven Goderis: Vrije Universiteit Brussel
Christopher M. Lowery: University of Texas at Austin
Sean P. S. Gulick: University of Texas at Austin
Joanna V. Morgan: SW7 2AZ

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract The Cretaceous/Paleogene boundary asteroid impact is recorded globally as a negative 187Os/188Os excursion, including in sediments recovered from the IODP-ICDP drilling within the peak ring of the Chicxulub structure in the Gulf of Mexico. The reconstructed marine 187Os/188Os curves can be used for global age correlations on the ~10 kyr scale. However, the versatility of Os isotope clock between the proximal and distal sites remains unclear. This paper presents 187Os/188Os records from early Paleocene sediments deposited in the Chicxulub impact basin and Mexican sites with biochronological scales. The results for these proximal sites show a recovery timescale of ~700 kyr, which is significantly longer than that of the distal sites (~200 kyr). The interval showing the 187Os/188Os decline coincides with the enrichment of hydrothermally-derived Mn, implying that hydrothermal venting at the Chicxulub structure may have played a role in the marine chemistry and ecosystem of the Gulf of Mexico.

Date: 2025
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DOI: 10.1038/s41467-025-58112-x

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