At the time I was doing my dissertation research, Sr and Pb isotopes were the only tools available for mantle isotope geochemistry, although some inferences about mantle and atmospheric evolution had been made based on argon isotope ratios (e.g., Damon and Kulp, 1958). Since, as expected, stable isotope ratios appeared to be constant within analytical error in the mantle they were of no interest (that eventually changed, as I’ll recount in a subsequent section). However, Notsu et al. (1973) had used the 147Sm-143Nd decay system to date a Roberts Victor Mine eclogite and Lugmair...

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