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Стр. 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 ...
Стр. 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 ...
Стр. 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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acid activity amount animals appear application associated behavior cells chemical complete concentration containing continuous culture Department described determined effect energy evidence example experiments fact field fraction give given glucose human Illus important increase indicate Institute interest laboratory lead less material means measurements mechanism ment method minutes nature normal Notes observed obtained occur operation organisms percent period physical plant Pleistocene position possible present Press pressure probably problems produced production range ratio rats reaction recent record References reported response sample Science scientific serum shown similar species structure suggest surface Table temperature tion unit University York