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      The origin and evolution of chondrites recorded in the elemental and isotopic compositions of their macromolecular organic matter

      , , ,
      Geochimica et Cosmochimica Acta
      Elsevier BV

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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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            Petrographic variations among carbonaceous chondrites of the Vigarano type

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              The oxygen isotope record in Murchison and other carbonaceous chondrites

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                Author and article information

                Journal
                Geochimica et Cosmochimica Acta
                Geochimica et Cosmochimica Acta
                Elsevier BV
                00167037
                September 2007
                September 2007
                : 71
                : 17
                : 4380-4403
                Article
                10.1016/j.gca.2007.06.052
                627f76c2-f52b-46ca-b901-bec59c8f53b3
                © 2007

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

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