Abstract
The 87Rb–87Sr isochrons for H-, E- and LL-, chondrites are undistinguishable from each other. The joint isochron yields an age of 4,498 ± 15 Myr if the rubidium decay constant λ 87Rb = 1.42×10−11 yr−1, and a strontium initial ratio 87Rb/87Sr = 0.69885±0.00010. For the age to agree with U–Th–Pb data, λ 87Rb would have to be changed to 1.402±0.008×10−11 yr−1
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Minster, JF., Birck, JL. & Allègre, C. Absolute age of formation of chondrites studied by the 87Rb–87Sr method. Nature 300, 414–419 (1982). https://doi.org/10.1038/300414a0
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