Lead isotope ratios in DSDP Leg 37 basalts

Details Lead isotope ratios in DSDP Leg 37 basalts Lead isotope ratios in DSDP Leg 37 basalts

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..31..179c&link_type=abstract

Earth and Planetary Science Letters, Volume 31, Issue 1, p. 179-183.

Physics

2

Scientific paper

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 since measured values are consistent with the ratio deduced from Pb isotope ratios. Ratios of U/Pb are not consistent with Pb isotope ratios, however, thus ruling out a simple two-stage evolutionary model.

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