摘要: Abstract The isotopic composition of lead was determined for two carbonaceous, H, and L chondrites. All are falls. The206Pb/204Pb ratios cover a range from 9.45 to 37.33; the207Pb/204Pb 10.39 26.10. data define a207Pb/206Pb age 4.635 AE. Uranium concentration indicate that the ages Bruderheim chondrite concordant within approximately 20%. This contrasts with in literature chondrites, which consistently discordant due large excesses radiogenic by factors or more. Pultusk may be concordant; those sample Richardton not. lack concordance is not analytical procedures, rather it likely result handling history prior analysis. L-3 chondrite, Mezo-Madaras contains such high - 5.27 PPM accurate primordial can obtained. These 206Pb/204Pb= 9.310;207Pb/204Pb= 10.296, values close agreement recently reported measurement on troilite Canyon Diablo iron meteorite.
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