Mathematics – Logic
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.1675s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 46, Issue 9, pp.1675-1679
Mathematics
Logic
1
Scientific paper
Isotopic fractionation as great as 1600% exists between 234 U and 238 U in spring waters, sediments, and fossils in the Pomme de Terre Valley, southwestern Missouri. The activity ratios of 234 U / 238 U in five springs range from 7.2 to 16 in water which has been discharged for at least the past 30,000 years. The anomalies in 234 U / 238 U ratio in deep water have potential usefulness in hydrologic investigations in southern Missouri. Clayey units overlying the spring bog sediments of Trolinger Spring are enriched in 230 Th relative to their parent 234 U by as much as 720%. The results indicate that both preferential displacement via alpha recoil ejection and the preferential emplacement via recoiling and physical entrapment are significant processes that are occurring in the geologic environment.
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