235U fission tracks and238U-series disequilibria as a means to study recent mobilization of uranium in Archaean pyritic conglomerates |
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| Authors: | K Thiel R Vorwerk R Saager HD Stupp |
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| Institution: | 1. Institut für Kernchemie, Universität Köln, Köln F.R.G.;2. Mineralogisch-Petrographisches Institut, Universität Köln, Köln F.R.G. |
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| Abstract: | Uranium transport in Archaean sediments was investigated by means of two carefully selected suites of variably weathered sediment samples from different localities of the Pongola Supergroup, Kaapvaal Craton, South Africa. U remobilization on a micron- to meter-scale was analyzed using U fission-track micromapping and α-spectrometry bulk measurements. These studies were supported by ore microscopy, neutron activation analysis and γ-spectrometry. By combining particle track technique and α-spectrometry detailed information is obtained on the U transport history of weathered surface samples. A simple model of U redistribution processes in geologic systems based on238U-series disequilibria is developed and applied to the samples investigated. Some implications for γ-radiometric field methods are discussed. |
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