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Tracing uranium mobility in groundwater of a fractured crystalline bedrock using radium isotopes and geochemical modelling
Stockholm University, Faculty of Science, Department of Geological Sciences.
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(English)Manuscript (preprint) (Other academic)
National Category
Geology
Research subject
Geology
Identifiers
URN: urn:nbn:se:su:diva-135739OAI: oai:DiVA.org:su-135739DiVA: diva2:1048609
Available from: 2016-11-21 Created: 2016-11-21 Last updated: 2016-11-24Bibliographically approved
In thesis
1. The mobility of natural uranium at Forsmark, Sweden, through geologic time
Open this publication in new window or tab >>The mobility of natural uranium at Forsmark, Sweden, through geologic time
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, the response of uranium minerals and poorly crystalline phases to changes in geochemical conditions through geological time has been assessed in order to understand the mobility of natural uranium in the fracture network of a proposed site for a spent nuclear fuel repository in Forsmark, Sweden. Identification and characterization of solid phase uranium have been performed through electron microprobe analysis and optical petrography (Article I). The identified uraninite, haiweeite, and uranophane crystals have been dated using U-Pb and Pb-Pb isotope ratios obtained from secondary ion mass spectrometry and laser ablation-inductively coupled plasma-mass spectrometry (Article II). The mobility of uranium in current Forsmark groundwaters and fracture system has been modelled using the PHREEQC geochemical program and Ra and Rn isotope systematics (Article IV). The rate of submarine groundwater discharge (SGD) from the Forsmark coast to Öregrundsgrepen has also been modelled using Ra isotopes (Article V). Results from these studies support a geologically early (~1200 Ma) oxidation of U(IV) to U(VI). It is further suggested that the old U(VI) minerals present in the bedrock are soluble at the pe values and alkalinities observed in the Forsmark groundwaters. At pe < −4.6 and alkalinity < 60 mg/L, U(VI) can be reduced to U(IV) and deposited in the fracture network. Although a non-negligible rate of SGD has been observed, this cannot be attributed to the discharge of deep (>200 m.b.s.l.) Forsmark groundwaters on the basis of current data.

Place, publisher, year, edition, pages
Stockholm: Department of Geological Sciences, Stockholm University, 2016. 28 p.
Series
Meddelanden från Stockholms universitets institution för geologiska vetenskaper, 365
Keyword
uranium, radium, mineralogy, geochronology, submarine groundwater discharge, spent nuclear fuel, geochemical modelling
National Category
Geology
Research subject
Geology
Identifiers
urn:nbn:se:su:diva-135735 (URN)978-91-7649-595-7 (ISBN)978-91-7649-596-4 (ISBN)
Public defence
2017-01-10, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: In press. Paper 4: Manuscript. Paper 5: Manuscript.

Available from: 2016-12-16 Created: 2016-11-21 Last updated: 2016-12-05Bibliographically approved

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