ScienceJohn Michels (Journalist) 1955 |
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Стр. 70
John Michels (Journalist). Table 1. Lead and uranium in meteorites ( 8 ) . Pb ( ppm ) 0.37 * C * Corrected for about 20 - percent terrestrial lead contamination introduced during chemical processing . Table 3. Lead and uranium in earth ...
John Michels (Journalist). Table 1. Lead and uranium in meteorites ( 8 ) . Pb ( ppm ) 0.37 * C * Corrected for about 20 - percent terrestrial lead contamination introduced during chemical processing . Table 3. Lead and uranium in earth ...
Стр. 71
... lead we have found in iron meteorites , the time of approximate equality is found to be about 4.5 x 109 yr . This can be inter- preted to mean that the calculated lead - uranium and lead - thorium ages for the earth agree with the lead- ...
... lead we have found in iron meteorites , the time of approximate equality is found to be about 4.5 x 109 yr . This can be inter- preted to mean that the calculated lead - uranium and lead - thorium ages for the earth agree with the lead- ...
Стр. 73
... lead data . These assumptions are ( i ) lead had a uni- form isotopic composition throughout the earth up to the time the crust was formed ; ( ii ) when the crust was formed , the Pb / U and Pb / Th ratios in different areas varied ...
... lead data . These assumptions are ( i ) lead had a uni- form isotopic composition throughout the earth up to the time the crust was formed ; ( ii ) when the crust was formed , the Pb / U and Pb / Th ratios in different areas varied ...
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