234U/238U signatures associated with uranium ore bodies: part 1 Ranger 3

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dc.contributor.authorLowson, RTen_AU
dc.contributor.authorMclntyre, MGen_AU
dc.date.accessioned2014-06-18T23:40:20Zen_AU
dc.date.available2014-06-18T23:40:20Zen_AU
dc.date.issued2013-04-01en_AU
dc.date.statistics2014-06-19en_AU
dc.description.abstractThe Ranger 3 ore body is an early Proterozoic U ore body in the Alligator Rivers U province, Northern Territory, Australia. It has surface expression with a redox front located between 30 and 50 m below the surface. The ground water U concentration and U-234/U-238 AR signature in the top 10 m of the weathered zone are reported for 357 samples collected over 4 wet seasons, at 5 depths, along a transect in-line with the hydraulic gradient and along the centre line of the ore body and its associated dispersion halo. The results show that the weathered zone displays a general U isotope feature for this type of ore body with the U-234/U-238 AR for the ground water and amorphous phase of the solid matrix being less than 1. The ground water U-234/U-238 AR is independent of the annual monsoonal climate and depth within the range surface to 10 m. In the vicinity of the U ore body the ground water U-234/U-238 AR is 0.75 and is very similar to the U-234/U-238 AR of the amorphous phase of the solid (0.76). The U-234/U-238 ARs of the amorphous phase and ground water rise and separate to values of 0.88 and 1.02 at the end of the transect. The rise and separation in U-234/U-238 AR are interpreted as evidence that the source of the U in the ground water is from the water-soluble sub-phase of the amorphous phase and that the ground water flow is too fast to allow the processes occurring across the solid water interface to reach chemical equilibrium. The data set is a robust characterisation of the coarse and fine detail of the U-234/U-238 AR signature in the weathered zone of U ore bodies. © 2013, Elsevier Ltd.en_AU
dc.identifier.citationLowson, R. T., & McIntyre, M. G. (2013). 234U/238U signatures associated with uranium ore bodies: part 1 Ranger 3. Journal of Environmental Radioactivity, 118, 150-156. doi:10.1016/j.jenvrad.2012.10.005en_AU
dc.identifier.govdoc4681en_AU
dc.identifier.issn0265-931Xen_AU
dc.identifier.journaltitleJournal of Environmental Radioactivityen_AU
dc.identifier.pagination150-156en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jenvrad.2012.10.005en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5696en_AU
dc.identifier.volume118en_AU
dc.language.isoenen_AU
dc.publisherElsevier Science Ltden_AU
dc.subjectUranium oresen_AU
dc.subjectOresen_AU
dc.subjectRadioisotopesen_AU
dc.subjectAustraliaen_AU
dc.subjectUraniumen_AU
dc.subjectGround wateren_AU
dc.title234U/238U signatures associated with uranium ore bodies: part 1 Ranger 3en_AU
dc.typeJournal Articleen_AU
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