Uranium migration in argillaceous sediments as analogue for transport processes in the far field of repositories (Ruprechtov site, Czech Republic)

Noseck, Ulrich; Brasser, Thomas; Laciok, A.; Hercik, Mirek; Woller, Frantisek

doi:10.1007/978-3-642-55668-5_24

Cited by 10 publications

(12 citation statements)

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“…Ollila et al (1996) assumed that uranium colloids influenced their experiments on U(IV) solubility in simulated groundwaters of granitic bedrock under anoxic conditions. Also Noseck et al (2002) suspected that U(IV) colloids might have influenced their experiments on the migration of U(IV) in a uranium ore deposit environment. In solubility measurements of U(IV) in Boom Clay pore water, Delecaut et al (2004) found U concentrations three orders of magnitude higher than the literature data for thermodynamic U(IV) solubility.…”

Section: Introductionmentioning

confidence: 98%

Formation of uranium(IV)-silica colloids at near-neutral pH

Dreissig

Weiß

Hennig

et al. 2011

Geochimica et Cosmochimica Acta

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Section: Introductionmentioning

confidence: 98%

Formation of uranium(IV)-silica colloids at near-neutral pH

Dreissig

Weiß

Hennig

et al. 2011

Geochimica et Cosmochimica Acta

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“…Further information on site conditions could be gained by a regional hydraulic model which has been created on the basis of older hydraulic head measurements and hydraulic tests performed close to the site and connected with kaolin exploration activities, indicating that the hydraulic gradient of groundwater in the Tertiary is generally from southwest to northeast. Based on all results at that time a first conceptual model of the origin and migration of uranium has been formulated [1,3]. In this model, uranium is assumed to be mobilised from granite under oxidising conditions and then transported through the tertiary aquifer.…”

Section: Site Descriptionmentioning

confidence: 99%

“…Within a bilateral project this site has been investigated by GRS, Germany and NRI, Czech Republic in order to identify the main mobilisation/immobilisation processes for PA-relevant elements, namely uranium, thorium and radium [1]. The investigation programme hitherto consists of preliminary site confirmation drillings and, recently, additional boreholes for completion of geological, hydrogeological and geochemical information.…”

Section: Introductionmentioning

confidence: 99%

Mobility of uranium in tertiary argillaceous sediments – a natural analogue study

Noseck¹,

Brasser²,

Rajlich³

et al. 2004

Radiochimica Acta

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The aim of the Natural Analogue study at Ruprechtov site (CZ) is to investigate the potential mobility of uranium in tertiary argillaceous sediments under representative long-term conditions. Such sediments often build up the overburden of host rocks for deep geological waste repositories. The Ruprechtov site represents a tertiary basin with argillized volcano-detritic sediments, which is surrounded by granite and underlain by kaolin and granite. U-enrichment mainly occurs in distinct layers of limited thickness on top of the kaolin close to aquiferous horizons and the clay-lignite seams. After a general survey of the site a new set of drillings has been sunk in 2002 in order to investigate the hydraulic, geological and chemical conditions of the area, including detailed investigations of kaolin and granite.Based on actual results new conceptual models for geological evolution and uranium transport pathways at Ruprechtov site have been developed. There is now strong evidence that U-migration at the site is mainly determined by three different processes: a) diffusion through kaolin, b) advection via fault zones across the kaolin and c) advection through aquiferous layers at the interface kaolin/Tertiary. Uranium source is the so-called Erzgebirgs-(Krusné hory) granite, underlying the Tertiary and kaolin and outcropping at the margins of the Tertiary basin.

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“…1. The shallow aquifer developed within the alluvial sediments of the floodplain associated with the stream is termed 'alluvial aquifer' (Seiler et al, 2002;Noseck et al, 2002) ( Fig. 1).…”

Section: Introductionmentioning

confidence: 99%