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      An algorithm for U-Pb isotope dilution data reduction and uncertainty propagation : U-Pb ALGORITHM

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      Geochemistry, Geophysics, Geosystems
      American Geophysical Union (AGU)

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          Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology

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            Zircon U–Pb chemical abrasion (“CA-TIMS”) method: Combined annealing and multi-step partial dissolution analysis for improved precision and accuracy of zircon ages

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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
                Geochemistry, Geophysics, Geosystems
                Geochem. Geophys. Geosyst.
                American Geophysical Union (AGU)
                15252027
                June 2011
                June 2011
                : 12
                : 6
                : n/a
                Article
                10.1029/2010GC003478
                3e281aae-b7ed-4046-ba0c-8b1b41e74aea
                © 2011

                http://doi.wiley.com/10.1002/tdm_license_1.1

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