New work reveals Earth’s potassium arrived by meteoritic delivery service. Earth’s potassium arrived by meteoritic delivery service finds new research led by Carnegie’s Nicole Nie and Da Wang. Their work, published on January 26 in the journal Science, shows that some primitive meteorites contai
. “Each stellar generation seeds the raw material from which subsequent generations are born and we can trace the history of this material across time.”
“By studying variations in the isotopic record preserved within meteorites, we can trace the source materials from which they formed and build a geochemical timeline of our Solar System’s evolution,” added Wang, who is now at Chengdu University of Technology. Wang and Nie—along with Carnegie colleagues Anat Shahar, Zachary Torrano, Richard Carlson, and Conel Alexander—measured the ratios of three potassium isotopes in samples from 32 different meteorites.
They found that some of the most primitive meteorites called carbonaceous chondrites, which formed in the outer Solar System, contained more potassium isotopes that were produced by huge stellar explosions, called supernovae. Whereas other meteorites—those that most frequently crash to Earth, called non-carbonaceous chondrites—contain the same potassium isotope ratios seen on our home planet and elsewhere in the inner Solar System.
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