Meteorites have inherited nucleosynthetic anomalies of potassium-40 produced in supernovae.

Autor: Nie NX; Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA., Wang D; Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA.; International Center for Planetary Science, College of Earth Sciences, Chengdu University of Technology, 610059 Chengdu, China., Torrano ZA; Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA., Carlson RW; Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA., O'D Alexander CM; Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA., Shahar A; Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2023 Jan 27; Vol. 379 (6630), pp. 372-376. Date of Electronic Publication: 2023 Jan 26.
DOI: 10.1126/science.abn1783
Abstrakt: Meteorites record processes that occurred before and during the formation of the Solar System in the form of nucleosynthetic anomalies: isotopic compositions that differ from the Solar System patterns. Nucleosynthetic anomalies are rarely seen in volatile elements such as potassium at bulk meteorite scale. We measured potassium isotope ratios in 32 meteorites and identified nucleosynthetic anomalies in the isotope potassium-40. The anomalies are larger and more variable in carbonaceous chondrite (CC) meteorites than in noncarbonaceous (NC) meteorites, indicating that CCs inherited more material produced in supernova nucleosynthesis. The potassium-40 anomaly of Earth is close to that of the NCs, implying that Earth's potassium was mostly delivered by NCs.
Databáze: MEDLINE
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