URANIUM-SERIES DATING OF CARNOTITES - CONCORDANCE BETWEEN TH-230 AND PA-231 AGES

Citation
A. Kaufman et al., URANIUM-SERIES DATING OF CARNOTITES - CONCORDANCE BETWEEN TH-230 AND PA-231 AGES, Chemical geology, 120(1-2), 1995, pp. 175-181
Citations number
7
Categorie Soggetti
Geology
Journal title
ISSN journal
00092541
Volume
120
Issue
1-2
Year of publication
1995
Pages
175 - 181
Database
ISI
SICI code
0009-2541(1995)120:1-2<175:UDOC-C>2.0.ZU;2-E
Abstract
Pa-231/U-235 and Th-230/U-234 ages were determined for 17 carnotites f rom two areas in Israel. For this purpose, a simplified one-step metho d was used to purify the protactinium, the extraction into TTA (thenoy l-trifluoro-acetone) at high acidity. Using the test of concordance be tween the two dating methods, 12 of the 17 carnotites were found to ha ve acted as closed chemical systems whereas 4 seem to have gained uran ium. The details of the relationships between the (231)pa/U-235 and th e Th-230/U-234 ages suggest that the uranium gain which took place in the latter 4 cases, occurred in a manner which was approximately conti nuous and linear.