Other
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1165g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 5, pp.1165-1171
Other
3
Scientific paper
The 227 Th / 230 Th dating method is described in detail and its usefulness investigated by comparing ages of sixteen Pleistocene carbonates (mainly cave deposits) with those determined by the 231 Pa / 235 U and 230 Th / 234 U methods. The 227 Th / 230 Th ages are found to be critically dependent on corrections for decay of 227 Th prior to alpha counting and ingrowth of daughter isotopes of 232 Th derived from clastic detritus. Of nineteen sets of ages determined for the sixteen samples, good agreement is found for only seven sets. Differences are attributed to low U content of some samples and the possibility of excess 227 Th in the calcite of samples younger than ~50 ky, possibly due to the coprecipitation of 231 Pa during formation. Calculated "negative" 227 Th / 230 Th ages may be a direct result of this process and the fact that, unlike the other methods, the activity ratio is non-zero at zero age. Nevertheless, the 227 Th / 230 Th is found to be a useful alternative dating technique for carbonates which are between ~50 and 300 ky, because no spiking is required. It also serves as a check for partial concordancy with ages dated by the other methods.
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