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Page 1094
Reports Genetic Relations of Oceanic Basalts as Indicated by Lead Isotopes Abstract . The isotopic compositions of lead and the concentrations of lead , uranium , and thorium in samples of oceanic tholeiite and alkali suites are ...
Reports Genetic Relations of Oceanic Basalts as Indicated by Lead Isotopes Abstract . The isotopic compositions of lead and the concentrations of lead , uranium , and thorium in samples of oceanic tholeiite and alkali suites are ...
Page 1095
The isotopic compositions of lead in the tholeiites and the alkali suites are given in Table 1. The observed lead isotope ratios for Easter Island rocks are similar to those of the alkali feldspar ( sample DWHD - 47 ( F ) ] in volcanic ...
The isotopic compositions of lead in the tholeiites and the alkali suites are given in Table 1. The observed lead isotope ratios for Easter Island rocks are similar to those of the alkali feldspar ( sample DWHD - 47 ( F ) ] in volcanic ...
Page 1097
The primary isochrons ( 1 ) , in which lead evolved in chemically closed and coetaneous systems with initial U238 / Pb204 ratios , are shown for the present , £ 100 million years , +500 million years , and -1500 million years .
The primary isochrons ( 1 ) , in which lead evolved in chemically closed and coetaneous systems with initial U238 / Pb204 ratios , are shown for the present , £ 100 million years , +500 million years , and -1500 million years .
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