Lead Isotopic Ages of Chondrules and Calcium-Aluminum-Rich Inclusions

2002/09/05 by Yuri Amelin, Alexander N. Krot, I. D. Hutcheon +1 · 8 citations
Physics and Astronomy · #Astro and Planetary Science #Astrophysics and Star Formation Studies #Planetary Science and Exploration

paper · doi:10.1126/science.1073950

openalex publication_date 2002/09/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/23

Abstract

The lead-lead isochron age of chondrules in the CR chondrite Acfer 059 is 4564.7 +/- 0.6 million years ago (Ma), whereas the lead isotopic age of calcium-aluminum-rich inclusions (CAIs) in the CV chondrite Efremovka is 4567.2 +/- 0.6 Ma. This gives an interval of 2.5 +/- 1.2 million years (My) between formation of the CV CAIs and the CR chondrules and indicates that CAI- and chondrule-forming events lasted for at least 1.3 My. This time interval is consistent with a 2- to 3-My age difference between CR CAIs and chondrules inferred from the differences in their initial 26Al/27Al ratios and supports the chronological significance of the 26Al-26Mg systematics.

Citations

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