Other
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2675k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 10, pp.2675-2681
Other
Scientific paper
The U-series nuclides, 230 Th, 234 U, 238 U, 227 Ac, 231 Pa and 210 Pb, were analyzed in up to 75 carnotites from a group of trenches in southwestern Israel. Though 230 Th / 234 U had the large range of 0.14 to 0.99, its spatial distribution was not random and the ratio never exceeded unity. 231 Pa / 230 Th was at least 91% concordant with 230 Th / 234 U in four of five cases. These facts, together with the details of the 230 Th / 234 U distribution, especially among ten samples from one small block of rock, indicate that 230 Th / 234 U ages of carnotites are at least a reasonable approximation of true ages. The unexpectedly widespread deficiencies in both 227 Ac and 210 Pb indicate that although carnotites are nearly closed to the migration of uranium, they are open to those of actinium and to lead, radon or radium. A model of carnotite precipitation is presented which attributes the large range in 230 Th / 234 U to a continual shift in the site of carnotite precipitation, in keeping with a continual change in the geometry of joints. This model may apply to other minerals as well.
Kaufman Archie
Ku Teh-Lung
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