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By evaluating nickel isotopes protected in the 66-million-year-old particles left by the Chicxulub effect, scientists conclude that the asteroid accountable for Earth’s last mass termination more than likely came from an incredibly uncommon class of primitive meteorites called carbonaceous chondrites of the Ornans type (CO chondrites).
This painting portrays an asteroid slamming into tropical, shallow seas of the sulfur-rich Yucatan Peninsula in what is today southeast Mexico. The after-effects of this enormous asteroid accident, which took place around 65 million years back, is thought to have actually triggered the termination of the dinosaurs and numerous other types in the world. Displayed in this painting are pterodactyls, flying reptiles with wingspans of approximately 50 feet, sliding above low tropical clouds. Image credit: Donald E. Davis/ NASA.
Carbonaceous chondrites comprise just 5% of meteorites up until now tested in the world. CO chondrites comprise a small portion of that group.
They are a few of the most primitive and unblemished products in the Solar System.
“CO chondrites are certainly not like the common meteors you discover in museum collections,” stated Professor Philippe Claeys, a scientist at Vrije Universiteit and the University of British Columbia.
“A CO includes much less unstable aspects– like carbon, zinc, water and especially sulfur– than other classes of meteorites we’ve found up until now in the world.”
“It does not modify our theory of what triggered the termination occasion, however it makes it less most likely that sulfur consisted of in the impactor was the cigarette smoking weapon.”
“The great particles tossed into the environment would have the main element.”
In their research study, Professor Claeys and associates performed high-precision nickel isotope measurements of samples gathered over years from a thin layer of clay produced around the world by the Chicxulub effect.
“This is tough work. Just a minute portion of the projectile is maintained in the world’s KT clay layer since the whole meteorite vaporized upon effect,” Professor Claeys stated.
Numerous concerns stay about the origins of the Chicxulub impactor.
Possible sources consist of far-off, debris-rich areas of the external Solar System and even the external location of the asteroid belt near Jupiter.
“The Chicxulub impactor was approximately 10 to 15 km,” Professor Claeys stated.
“It struck at an approximated 64,000 km/h forming the enormous crater.”
“The effect zone is buried below the Yucatán Peninsula in Mexico.”
“Being affected by such an unusual, remote projectile actually highlights how unfortunate the dinosaurs were.”
The research study was released today in the journal Science Advances
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Georgy V. Makhatadze et al2026 The origin of Cretaceous-Palaeogene impactor exposed by nickel isotopes. Science Advances 12 (29 ); doi: 10.1126/ sciadv.aef4858
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