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- Title
Lead isotopic ages of chondrules and calcium-aluminum-rich inclusions.
- Authors
Amelin, Yuri; Krot, Alexander N; Hutcheon, Ian D; Ulyanov, Alexander A
- 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.
- Publication
Science (New York, N.Y.), 2002, Vol 297, Issue 5587, p1678
- ISSN
1095-9203
- Publication type
Journal Article
- DOI
10.1126/science.1073950