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      Planetary accretion in the inner Solar System

      Earth and Planetary Science Letters
      Elsevier BV

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          Aerodynamics of solid bodies in the solar nebula

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            Oligarchic Growth of Protoplanets

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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
                Earth and Planetary Science Letters
                Earth and Planetary Science Letters
                Elsevier BV
                0012821X
                July 2004
                July 2004
                : 223
                : 3-4
                : 241-252
                Article
                10.1016/j.epsl.2004.04.031
                b3e78ffa-0035-4e63-8024-1edb0c80c82d
                © 2004

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

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