Lead Isotopic Ages of Chondrules and Calcium-Aluminum-Rich Inclusions
Top Cited Papers
- 6 September 2002
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 297 (5587) , 1678-1683
- https://doi.org/10.1126/science.1073950
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 26 Al/ 27 Al ratios and supports the chronological significance of the 26 Al- 26 Mg systematics.Keywords
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