Uraniferous dolomite: a natural source of high groundwater uranium concentrations in northern Bavaria, Germany?

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dc.contributor.authorSteffanowski, Jacqueline
dc.contributor.authorBanning, Andre
dc.date.accessioned2021-12-08T15:57:01Z
dc.date.available2021-12-08T15:57:01Z
dc.date.issued2017-07-26
dc.date.updated2021-11-23T15:22:17Z
dc.description.abstractNaturally high uranium (U) concentrations occur in the groundwater of northern Bavaria (southeastern Germany) although the source(s) and geochemical processes controlling its occurrence are poorly understood. An earlier study identified the weathering of uraniferous apatite as responsible for elevated groundwater U in a part of the region. This present study focuses on a uraniferous dolomite facies in the Triassic sandstone aquifer of northern Bavaria as a potential source of dissolved uranium in the regional groundwater. Hydrogeochemical and mineralogical analytical methods (INAA, ICP-OES, SEP, XRD, C/S measurements), in conjunction with existing hydro- and geochemical datasets, as well as hydrogeochemical modeling approaches indicate a strong connection between groundwater U and the dolomitic facies. Highest groundwater concentrations (max 58.3 µg L−1) occur under slightly alkaline and oxic to slightly reducing conditions. Uranium speciation is dominated by mobile U(VI), predominantly in the form of uranyl-carbonate complexes. Groundwater is undersaturated with respect to U mineral phases. In addition, high values in the dolomite extraction step (SEP) and a positive correlation of dolomite (XRD) and Ca with U (INAA) support the assumption of mobilization from the uraniferous dolomite as a potential source for elevated U concentrations, and hence one of the causes for the geogenic groundwater U problem in this region.en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid508en
dc.identifier.citationSteffanowski, J. and Banning, A. (2017) 'Uraniferous dolomite: a natural source of high groundwater uranium concentrations in northern Bavaria, Germany?'', Environmental Earth Sciences, 76 (15), 508, (11 pp). doi: 10.1007/s12665-017-6848-6en
dc.identifier.doi10.1007/s12665-017-6848-6en
dc.identifier.endpage11en
dc.identifier.issn1866-6280
dc.identifier.issued15en
dc.identifier.journaltitleEnvironmental Earth Sciencesen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/12341
dc.identifier.volume76en
dc.language.isoenen
dc.publisherSpringeren
dc.relation.urihttps://link.springer.com/article/10.1007%2Fs12665-017-6848-6
dc.rights© Springer-Verlag GmbH Germany 2017. This is a post-peer-review, pre-copyedit version of an article published in Environmental Earth Sciences. The final authenticated version is available online at: https://doi.org/10.1007/s12665-017-6848-6en
dc.subjectDolcreteen
dc.subjectHydrogeochemistryen
dc.subjectMobilityen
dc.subjectSequential extractionen
dc.subjectTrace elementsen
dc.subjectTriassicen
dc.titleUraniferous dolomite: a natural source of high groundwater uranium concentrations in northern Bavaria, Germany?en
dc.typeArticle (peer-reviewed)en
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