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      Early core formation in asteroids and late accretion of chondrite parent bodies: Evidence from 182Hf-182W in CAIs, metal-rich chondrites, and iron meteorites

      , , , ,
      Geochimica et Cosmochimica Acta
      Elsevier BV

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          Chemical fractionations in meteorites—II. Abundance patterns and their interpretation

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            The composition of the stone meteorites and the origin of the meteorites

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

              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
                Geochimica et Cosmochimica Acta
                Geochimica et Cosmochimica Acta
                Elsevier BV
                00167037
                December 2005
                December 2005
                : 69
                : 24
                : 5805-5818
                Article
                10.1016/j.gca.2005.07.012
                73529383-0ddd-4721-8bea-500a018522d8
                © 2005

                http://www.elsevier.com/tdm/userlicense/1.0/


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