Other
Scientific paper
Sep 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969gecoa..33.1045w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 33, Issue 9, pp.1045-1055
Other
1
Scientific paper
Lead samples from moldavites and from Ries glass are isotopically similar, except that the Ries glass tends to be slightly enriched in the radiogenic lead isotopes relative to moldavites. The lead in these materials is similar to the lead found in oceanic sediments and falls on the growth curves typical of most terrestrial rock and ore lead samples. This is true of lead in other tektite groups, with one exception. Lead from Ivory Coast tektites does not fall on the growth trend of modern terrestrial lead. Lead samples from Bosumtwi Crater dark glass and from the gray phyllite (country rock) at Bosumtwi Crater are similarly displaced from the typical growth trend. These features may be explained in terms of lead isotopic development over long periods of time in environments which differ somewhat from the normal in terms of relative U, Th, and Pb abundances, which suggests that the tektites as well as the impact glass were derived from the Precambrian rocks at Bosumtwi Crater. High U / Pb ratios ( U 238 / Pb 204 > 20) were found in all tektites analysed, indicating enrichment of U relative to Pb either at the time of tektite formation or within a time period not exceeding a few hundred million years prior to tektite formation. Lower U / Pb ratios were found in the impact glasses. Lead samples from a bediasite and a Georgia tektite are the same, isotopically, and similar to lead from other tektite groups (except the Ivory Coast tektites).
Cameron Edward A.
Smith David H.
Wampler Marion J.
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