Experts studying material from event 66m years ago find signs to show how Chicxulub impact crater was formed
Experts studying material laid down at the time of the event say they have found tell-tale signs to support the idea the Chicxulub impact crater was produced by a carbon-rich, “C-type”, asteroid that originally formed beyond the orbit of Jupiter.
, the researchers report how they studied different types, or isotopes, of ruthenium within a layer of material that settled over the globe after the impact 66m years ago.The team chose to look at ruthenium because the metal is very rare in the Earth’s crust. The team found samples of the layer from Denmark, Italy and Spain all showed the same ruthenium isotope composition.
The team also cast doubt on the possibility that the impactor was a comet, saying the ruthenium isotope composition of the samples is different to that of meteorites thought to be fragments of comets that have lost their ice.
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