The status of U-series methods of mollusk dating

Details The status of U-series methods of mollusk dating The status of U-series methods of mollusk dating

Nov 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35.1155k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 35, Issue 11, pp.1155-1183

Physics

29

Scientific paper

An intensive evaluation is presented of the 400 available analyses of U-series nuclides in mollusks including 200 performed as part of the present study. It is shown that among the 60 samples of known age, Th 230 / U 234 ratios give correct ages no more than half of the time. The samples of unknown age show the following evidence of having been open systems: increase of U 238 with time, increase of U 234 relative to U 238 , and disagreement between Th 230 / U 234 ages and Pa 231 / U 235 ages. It is also shown that a recently proposed open system model ( and , 1969) is based on unlikely isotopic migration patterns. This model commonly yields ages which conflict with known ages and its apparent internal consistency in several cases is shown to be no better than that for alternative models. Finally in the vast majority of cases, resulting U 234 / U 238 evolution patterns are different from those actually observed.

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