Other
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39..661t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 39, Issue 5, pp.661-669
Other
4
Scientific paper
Speleothem from West Virginia, ranging in age from 2000 to 200,000 yr B.P. contains uranium with U 234 / U 238 ratios significantly greater than unity. This ratio varies from one speleothem to another, as does average U content. Initial ratios, corrected for age, are remarkably constant for a given speleothem. By contrast, U 234 / U 238 ratios in seepage waters vary significantly from month to month at a given drip site, and their average values differ from that of the speleothem which they are depositing. This discrepancy is attributed either to long-term averaging-out of fluctuations, or fractional precipitation on the speleothem of a chemical species of uranium with a more constant ratio. Constancy of initial U 234 / U 238 ratios from Th 230 / U 234 . datable portions of speleothems should permit U 234 / U 238 -dating of older portions of the same speleothem, back to about 10 6 yr B.P., with estimated precision of ±5 per cent.
Ford Derek C.
Schwarcz Henry P.
Thompson Peter
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