Ruthenium isotopes show the Chicxulub impactor was a carbonaceous-type asteroid-Reference-Cited by-同舟云学术

Ruthenium isotopes show the Chicxulub impactor was a carbonaceous-type asteroid

Published:2024-08-16 Issue:6710 Volume:385 Page:752-756
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Fischer-Gödde Mario¹^ORCID,Tusch Jonas¹^ORCID,Goderis Steven²^ORCID,Bragagni Alessandro³⁴^ORCID,Mohr-Westheide Tanja⁵,Messling Nils⁶^ORCID,Elfers Bo-Magnus⁷^ORCID,Schmitz Birger⁸,Reimold Wolf U.⁹,Maier Wolfgang D.¹⁰,Claeys Philippe²^ORCID,Koeberl Christian¹¹^ORCID,Tissot François L. H.¹²^ORCID,Bizzarro Martin¹³^ORCID,Münker Carsten¹^ORCID

Affiliation:

1. Institut für Geologie und Mineralogie, University of Cologne, 50674 Cologne, Germany.

2. Archeology, Environmental Changes and Geochemistry Research Group, Vrije Universiteit Brussel, 1050 Brussels, Belgium.

3. Department of Earth Sciences, University of Florence, 50121 Firenze, Italy.

4. Institute of Marine Sciences, National Research Council, 40129 Bologna, Italy.

5. Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, 10115 Berlin, Germany.

6. Geochemistry and Isotope Geology Department, Geoscience Center, University of Göttingen, 37073 Göttingen, Germany.

7. Zentrallabor, Technical University Hamburg, 21073 Hamburg, Germany.

8. Astrogeobiology Laboratory, Lund University, SE-22100 Lund, Sweden.

9. Laboratório de Geocronologia e Geoquímica Isotópica, Instituto de Geociências, Universidade de Brasília, CEP 70910-900 Brasília, DF, Brazil.

10. School of Earth and Ocean Sciences, Cardiff University, Cardiff CF10 3AT, UK.

11. Department of Lithospheric Research, University of Vienna, A-1090 Vienna, Austria,

12. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena CA 91125, USA.

13. Center for Star and Planet Formation, Globe Institute, University of Copenhagen, DK-1350 Copenhagen, Denmark.

Abstract

An impact at Chicxulub, Mexico, occurred 66 million years ago, producing a global stratigraphic layer that marks the boundary between the Cretaceous and Paleogene eras. That layer contains elevated concentrations of platinum-group elements, including ruthenium. We measured ruthenium isotopes in samples taken from three Cretaceous-Paleogene boundary sites, five other impacts that occurred between 36 million to 470 million years ago, and ancient 3.5-billion- to 3.2-billion-year-old impact spherule layers. Our data indicate that the Chicxulub impactor was a carbonaceous-type asteroid, which had formed beyond the orbit of Jupiter. The five other impact structures have isotopic signatures that are more consistent with siliceous-type asteroids, which formed closer to the Sun. The ancient spherule layer samples are consistent with impacts of carbonaceous-type asteroids during Earth’s final stages of accretion.

Publisher

American Association for the Advancement of Science (AAAS)

Link

https://www.science.org/doi/pdf/10.1126/science.adk4868

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