Alligator Rivers Analogue Project Review of Research and Its Implications for Model Validation

Duerden, P.; Golian, C.; Hardy, C.J.; Nightingale, T.; Payne, Timothy E.

doi:10.1007/978-94-009-3465-8_8

Cited by 2 publications

(2 citation statements)

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“…Therefore , natural analogue studies have been carried out at several sites throughout the world (Airey, 1986;Cramer, 1989;Petit, 1990;Suutarinen et al, 1991;Menager et al, 1992;Menet et al, 1992;Nohara et al, 1992). The Alligator Rivers Analogue Project (ARAP) was one of these natural analogue studies, and was aimed at understanding the mobility and retarda tion of uranium at the Koongarra uranium ore deposit over long timescales (Duerden et al, 1987). At Koongarra, uranium has been trans ported over distances of approximately 200 m by groundwater flowing through the weathering rock formation which hosts the deposit.…”

Section: Introductionmentioning

confidence: 99%

Groundwater geochemistry in the Koongarra ore deposit, Australia (I): Implications for uranium migration.

Yanase¹,

Payne

Sekine³

1995

Geochem. J.

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Groundwater geochemistry at the Koongarra uranium ore deposit was investigated in order to gain a detailed understanding of the migration of uranium in a highly weathered water-rock system . Koongarra groundwaters are quite dilute with the total dissolved solids usually below 200 mg/1. The pH is slightly acidic or neutral, and the major chemical characteristics are dominated by magnesium and bicarbonate . Partial pressures of CO2 in the deeper groundwaters are substantially elevated relative to those of surface waters. Groundwater in the mineralized zones exhibits elevated levels of uranium up to three orders of magnitude above background levels. Total organic carbon levels are generally low , suggesting that uranium complexation by organic species plays a minor role. Due to the high bicarbonate concentration , uranium appears to be mobile in the weathered zone as uranyl carbonate complexes . Other inorganic uranium complexants are not present at levels sufficient to influence uranium speciation , with the possible exception of phosphate.On the basis of chemical and isotopic evidence, there are two major inputs of groundwater to the system. The first of these is flows from the vicinity of the Koongarra fault into the Cahill formation , which hosts the uranium mineralization. A second major source is infiltrating waters which permeate downward from the surface, and cause a gradual mixing and dilution of the characteristics of groundwaters from the mineralized zone. The migration of uranium in groundwater is not only perpendicular to the fault, but includes a component at an angle to it . In the vicinity of borehole C 1 (due south of the ore zone), uranium concentrations are comparatively high , given the distance from the orebody. Moving away from the ore zone to the south-east, there is a gradual decrease of groundwater uranium concentrations t o b ackground levels over approximately 200 meters , which coincides. with the uranium distribution in the solid phase. Therefore, at Koongarra, uranium seems to have migrated over distances of approximat ely 200 m toward the south-east over a time period estimated to be 1 to 1 .5 million years.

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Section: Introductionmentioning

confidence: 99%

Groundwater geochemistry in the Koongarra ore deposit, Australia (I): Implications for uranium migration.

Yanase¹,

Payne

Sekine³

1995

Geochem. J.

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“…Hence such a deposit forms a useful analogue to a nuclear waste repository in a similar bedrock. By studying the speciations of uranium and thorium in groundwater, it is possible to make a long-time prediction of the possible behaviour of analogous radionuclides present in nuclear fuel [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Uranium in Groundwater in Palmottu Analogue Study Site in Finland

Suutarinen¹,

Blomqvist²,

Halonen³

et al. 1991

Radiochimica Acta

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The small Precambrian U-Th deposit of Palmottu, Finland, has been studied as a natural geological analogue for a highlevel radioactive waste repository. The chemical composition and physico-chemical characteristics of groundwater with tritium values in drill holes intersecting the deposit are given. Uranium concentrations and 234 U/ 238 U radioactivity ratios in groundwater, based on various sampling methods, are presented as depth profiles (from surface to 250 m). Factors affecting the distribution of uranium and the observed activity ratios in groundwater and particulate matter are discussed.

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Alligator Rivers Analogue Project Review of Research and Its Implications for Model Validation

Cited by 2 publications

References 1 publication

Groundwater geochemistry in the Koongarra ore deposit, Australia (I): Implications for uranium migration.

Groundwater geochemistry in the Koongarra ore deposit, Australia (I): Implications for uranium migration.

Uranium in Groundwater in Palmottu Analogue Study Site in Finland

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