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      Lead isotopic ages of chondrules and calcium-aluminum-rich inclusions.

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          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.

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          Author and article information

          Journal
          Science
          Science (New York, N.Y.)
          American Association for the Advancement of Science (AAAS)
          1095-9203
          0036-8075
          Sep 06 2002
          : 297
          : 5587
          Affiliations
          [1 ] Department of Earth Sciences, Royal Ontario Museum, Toronto, ON M5S 2C6, Canada. yamelin@NRCan.gc.ca
          Article
          297/5587/1678
          10.1126/science.1073950
          12215641
          888fa9ff-01ca-497e-b57f-48577b75c403

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