High spatial resolution ion microprobe measurements refine chronology of carbonate formation in Orgueil
作者： Peter Hoppe , Doug MacDougall , Günter W. Lugmair
DOI: 10.1111/J.1945-5100.2007.TB00576.X
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摘要: Aqueous activity on meteorite parent bodies is indicated by the presence of carbonates. High spatial resolution ion microprobe analyses nine individual carbonate grains (four dolomites, five breunnerites) from Orgueil reveal linear correlations between 53Cr excesses and Mn/Cr ratios in all grains, indicative situ decay radioactive 53Mn (half-life 3.7 million years). The well-defined isochrons appear to have chronological significance. If this case, then 53Mn/ 55Mn 2.1 4.7 x 10^(-6) are inferred for time formation absolute ages 4561 4565 Ma calculated (systematic uncertainty 2 Ma). Dolomites tend formed slightly earlier than breunnerites. Our data imply extensive aqueous body over a period several years, starting ~3-4 Myr after solar system, that most likely was result impact heating latent heat 26Al 60Fe.
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