Computer Science
Scientific paper
Nov 1958
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1958gecoa..15....1s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 15, Issue 1-2, pp.1-5
Computer Science
1
Scientific paper
Lead tetramethyl was synthesized from lead iodide isolated from 14 galenas, 2 anglesites and 6 pyromorphites of Japan. The mass spectrometric analysis was carried out for the peaks of lead and lead hydride ions. The isotopic compositions of leads from these minerals lie within a narrow range. The average values for galenas are 18.51 ± 0-05 for 206 Pb/ 204 Pb, 15.60 ± 0.05 for 207 Pb/ 204 Pb and 38.76 ± 0.15 for 208 Pb/ 204 Pb. For lead of secondary minerals they are 18.52 ± 0.05, 15.62 ± 0.05 and 38.78 ± 0.15, respectively. No detectable difference was observed between the isotopic compositions of primary and secondary lead ores. The ratios, 238 U/ 204 Pb and 232 Th/ 238 U, in the source magma are estimated from the lead abundances. They are 9.10 ~10.0 and 3.81 ~4.00, respectively.
Sakai Hitoshi
Sat Kazuo
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