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A multi-technique study of altered granitic rock from the Krunkelbach Valley uranium deposit, Southern Germany

Pidchenko, I.; Bauters, S.; Sinenko, I.; Hempel, S.; Amidani, L.; Detollenaere, D.; Vinze, L.; Banerjee, D.; Van Silfhout, R.; Kalmykov, S. N.; Göttlicher, J. 1; Baker, R. J.; Kvashnina, K. O.
1 Institut für Photonenforschung und Synchrotronstrahlung (IPS), Karlsruher Institut für Technologie (KIT)


Herein, a multi-technique study was performed to reveal the elemental speciation and microphase composition in altered granitic rock collected from the Krunkelbach Valley uranium (U) deposit area near an abandoned U mine, Black Forest, Southern Germany. The former Krunkelbach U mine with 1–2 km surrounding area represents a unique natural analogue site with the rich accumulation of secondary U minerals suitable for radionuclide migration studies from a spent nuclear fuel (SNF) repository. Based on a micro-technique analysis using several synchrotron-based techniques such as X-ray fluorescence analysis, X-ray absorption spectroscopy, powder X-ray diffraction and laboratory-based scanning electron microscopy and Raman spectroscopy, the complex mineral assemblage was identified. While on the surface of granite, heavily altered metazeunerite–metatorbernite (Cu(UO$_{2}$)$_{2}$(AsO$_{4}$)$_{2-x}$(PO$_{4}$)$_{x}$·8H$_{2}$O) microcrystals were found together with diluted coatings similar to cuprosklodowskite (Cu(UO$_{2}$)$_{2}$(SiO$_{3}$OH)$_{2}$·6H$_{2}$O), in the cavities of the rock predominantly well-preserved microcrystals close to metatorbernite (Cu(UO$_{2}$)$_{2}$(PO$_{4}$)$_{2}$·8H$_{2}$O) were identified. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000122970
Veröffentlicht am 08.09.2020
DOI: 10.1039/d0ra03375h
Zitationen: 3
Web of Science
Zitationen: 3
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2046-2069
KITopen-ID: 1000122970
HGF-Programm 56.98.01 (POF III, LK 01) Betrieb in MML
Erschienen in RSC Advances
Verlag Royal Society of Chemistry (RSC)
Band 10
Heft 43
Seiten 25529-25539
Nachgewiesen in Web of Science
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