Lead isotope ratios of basalts from DSDP Leg 37 (Table 1), supplement to: Cumming, G L (1976): Lead isotope ratios in DSDP Leg 37 basalts. Earth and Planetary Science Letters, 31(1), 179-183

G L Cumming
Analyses of Pb from mid-ocean ridge basalts obtained from DSDP Leg 37 lie on a line of near-zero-age slope. The data seem consistent with an evolutionary model of three stages, the beginning of the second stage being at about 600 m.y. - the model age obtained for the least radiogenic Pb. The beginning of the third stage of evolution at the time of formation of the rocks apparently did not change the average Th/U ratio...
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