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

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

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sci...297.1678a&link_type=abstract

Science, Volume 297, Issue 5587, pp. 1678-1683 (2002).

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263

Scientific paper

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.

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