U-series disequilibria in a groundwater flow route as an indicator of uranium migration processes

Suksi, Juhani; Rasilainen, Kari; Casanova, Joël; Ruskeeniemi, Timo; Blomqvist, R.; Smellie, J.A.T.

doi:10.1016/s0169-7722(00)00148-0

Cited by 29 publications

(18 citation statements)

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“…This indicates relatively recent deposition of U from water with 234 U/ 238 U AR > 1 (Figure 3). This result is similar to the cases studied by [13,32,33]. Suksi et al [13] reported fracture calcites from the groundwaters with 230 Th/ 234 U AR = 3.22 in Almottu, Finland.…”

Section: Activity Ratios Of U-series Radionuclidesupporting

confidence: 84%

“…This result is similar to the cases studied by [13,32,33]. Suksi et al [13] reported fracture calcites from the groundwaters with 230 Th/ 234 U AR = 3.22 in Almottu, Finland. Toulhoat et al [34] proposed a classification of waters based on two parameters, U concentration and 234 U/ 238 U AR.…”

Section: Activity Ratios Of U-series Radionuclidesupporting

confidence: 84%

“…At the reducing barrier, the U concentration becomes greatly reduced as water flows into the oxygen-depleted front; the U is effectively removed from the water ( Table 1). The U concentration of the groundwaters from the reducing subzone aquifer (samples [10][11][12][13][14] in the Shihongtan ore district is typically lower than 1.00 μg/L (0.01-0.88 μg/L), with an average of 0.27 μg/L. However, the U concentration in the groundwaters increases toward the oxidizing subzone aquifer (samples 3-5 and 15-18) where values greater than 6.00 μg/L are common.…”

Section: Uranium Concentrationsmentioning

confidence: 99%

“…From a dating point of view, the method covers the time period extending back over the last 1.7 million years, which is particularly interesting for paleohydrogeological research [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…The use of U-Th disequilibrium to understand water-rock interactions and groundwater flow have been previously reported [3,13,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Uranium-Series Disequilibria in the Groundwater of the Shihongtan Sandstone-Hosted Uranium Deposit, NW China

et al. 2015

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Uranium (U) concentration and the activities of 238 U, 234 U, and 230 Th were determined for groundwaters, spring waters, and lake water collected from the Shihongtan sandstone-hosted U ore district and in the surrounding area, NW China. The results show that the groundwaters from the oxidizing aquifer with high dissolved oxygen concentration (O 2 ) and oxidation-reduction potential (Eh) are enriched in U. The high U concentration of groundwaters may be due to the interaction between these oxidizing groundwaters and U ore bodies, which would result in U that is not in secular equilibrium. Uranium is re-precipitated as uraninite on weathered surfaces and organic material, forming localized ore bodies in the sandstone-hosted aquifer. The 234 U/ 238 U, 230 Th/ 234 U, and 230 Th/ 238 U activity ratios (ARs) for most water samples show obvious deviations from secular equilibrium (0.27-2.86), indicating the presence of water-rock/ore interactions during the last 1.7 Ma and probably longer. The 234 U/ 238 U AR generally increases with decreasing U concentrations in the groundwaters, suggesting that mixing of two water sources may occur in the aquifer. This is consistent with the fact that most of the U ore bodies in the deposit have a tabular shape originati from mixing between a relatively saline fluid and a more rapidly flowing U-bearing meteoric water.

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Section: Activity Ratios Of U-series Radionuclidesupporting

confidence: 84%

Section: Activity Ratios Of U-series Radionuclidesupporting

confidence: 84%

Section: Uranium Concentrationsmentioning

confidence: 99%

“…From a dating point of view, the method covers the time period extending back over the last 1.7 million years, which is particularly interesting for paleohydrogeological research [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…The use of U-Th disequilibrium to understand water-rock interactions and groundwater flow have been previously reported [3,13,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations