dc.contributor.author |
Vogel, JC
|
en_US |
dc.contributor.author |
Talma, AS
|
en_US |
dc.contributor.author |
Heaton, THE
|
en_US |
dc.contributor.author |
Kronfeld, J
|
en_US |
dc.date.accessioned |
2007-02-07T06:02:43Z |
en_US |
dc.date.accessioned |
2007-06-07T10:01:53Z |
|
dc.date.available |
2007-02-07T06:02:43Z |
en_US |
dc.date.available |
2007-06-07T10:01:53Z |
|
dc.date.copyright |
|
en_US |
dc.date.issued |
1999-07 |
en_US |
dc.identifier.citation |
Vogel, JC, et al. 1999. Evaluating the rate of migration of an uranium deposition front within the Uitenhage Aquifer. Journal of Geochemical Exploration, vol 66, 2 January, pp 269-276 |
en_US |
dc.identifier.issn |
0375-6742 |
en_US |
dc.identifier.uri |
http://hdl.handle.net/10204/1571
|
en_US |
dc.identifier.uri |
http://hdl.handle.net/10204/1571
|
|
dc.description.abstract |
The solubility of uranium in groundwater is very sensitive to changes in redox conditions. Many secondary sandstone-type uranium deposits have been formed when soluble U has precipitated after encountering reducing conditions in the subsurface. In the groundwater of the Uitenhage Aquifer (Cape Province, South Africa), U-238-series isotopes were used to assist in studying the history of the reducing barrier. Uranium isotopes were used to determine the present position of the barrier. Radium and radon were used to evaluate the path of migration that the front of the oxygen depletion zone has taken over the past 10 years. During this time the reducing barrier has moved, leaving in its wake a trail of U in various stages of secular equilibrium with its daughter Th-230. The Ra-226 daughter of Th-230 is not very mobile. Its growth upon the aquifer wall is reflected in the Rn content of the water. This in turn, due to the relatively great age of the water, indicates the extent of the Th-230 in growth from precipitated U that took place before the barrier migrated. Though economic uranium concentrations were not encountered in this study, the investigation serves to demonstrate the importance of investigating not only the present redox conditions as it pertains to U deposition, but the need to understand the past position of the uranium precipitation front. These are revealed by a combined study of the soluble uranium, radium and radon, combined with knowledge of the rate of groundwater flow. |
en_US |
dc.format.extent |
695793 bytes |
en_US |
dc.format.mimetype |
application/pdf |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
Elsevier Science BV |
en_US |
dc.rights |
Copyright: 1999 Elsevier Science Ltd |
en_US |
dc.source |
|
en_US |
dc.subject |
Sandstone-type uranium deposits |
en_US |
dc.subject |
Uitenhage Aquifer - South Africa |
en_US |
dc.subject |
Uranium series isotopes |
en_US |
dc.subject |
Geophysics |
en_US |
dc.subject |
Sciences |
en_US |
dc.title |
Evaluating the rate of migration of an uranium deposition front within the Uitenhage Aquifer |
en_US |
dc.type |
Article |
en_US |
dc.identifier.apacitation |
Vogel, J., Talma, A., Heaton, T., & Kronfeld, J. (1999). Evaluating the rate of migration of an uranium deposition front within the Uitenhage Aquifer. http://hdl.handle.net/10204/1571 |
en_ZA |
dc.identifier.chicagocitation |
Vogel, JC, AS Talma, THE Heaton, and J Kronfeld "Evaluating the rate of migration of an uranium deposition front within the Uitenhage Aquifer." (1999) http://hdl.handle.net/10204/1571 |
en_ZA |
dc.identifier.vancouvercitation |
Vogel J, Talma A, Heaton T, Kronfeld J. Evaluating the rate of migration of an uranium deposition front within the Uitenhage Aquifer. 1999; http://hdl.handle.net/10204/1571. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - Vogel, JC
AU - Talma, AS
AU - Heaton, THE
AU - Kronfeld, J
AB - The solubility of uranium in groundwater is very sensitive to changes in redox conditions. Many secondary sandstone-type uranium deposits have been formed when soluble U has precipitated after encountering reducing conditions in the subsurface. In the groundwater of the Uitenhage Aquifer (Cape Province, South Africa), U-238-series isotopes were used to assist in studying the history of the reducing barrier. Uranium isotopes were used to determine the present position of the barrier. Radium and radon were used to evaluate the path of migration that the front of the oxygen depletion zone has taken over the past 10 years. During this time the reducing barrier has moved, leaving in its wake a trail of U in various stages of secular equilibrium with its daughter Th-230. The Ra-226 daughter of Th-230 is not very mobile. Its growth upon the aquifer wall is reflected in the Rn content of the water. This in turn, due to the relatively great age of the water, indicates the extent of the Th-230 in growth from precipitated U that took place before the barrier migrated. Though economic uranium concentrations were not encountered in this study, the investigation serves to demonstrate the importance of investigating not only the present redox conditions as it pertains to U deposition, but the need to understand the past position of the uranium precipitation front. These are revealed by a combined study of the soluble uranium, radium and radon, combined with knowledge of the rate of groundwater flow.
DA - 1999-07
DB - ResearchSpace
DP - CSIR
KW - Sandstone-type uranium deposits
KW - Uitenhage Aquifer - South Africa
KW - Uranium series isotopes
KW - Geophysics
KW - Sciences
LK - https://researchspace.csir.co.za
PY - 1999
SM - 0375-6742
T1 - Evaluating the rate of migration of an uranium deposition front within the Uitenhage Aquifer
TI - Evaluating the rate of migration of an uranium deposition front within the Uitenhage Aquifer
UR - http://hdl.handle.net/10204/1571
ER -
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en_ZA |