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Rare earth element partitioning between fluids and uraninite at 50-700 degrees C

Brandi M. Shabaga, Mostafa Fayek, Alysha McNeil, Robert L. Linnen and Eric G. Potter
Rare earth element partitioning between fluids and uraninite at 50-700 degrees C
The Canadian Mineralogist (December 2020) Pre-Issue Publication


Uranium deposits are globally diverse, occurring in a wide variety of geological settings and ranging in age from Archean to Holocene. As a result, understanding the mechanisms involved in the genesis and subsequent alteration of these complex deposits is challenging. Building on recent work on the geochemical signatures of uraninite, a series of experiments were designed to document the partitioning of rare earth elements between uraninite and fluids over a range of temperatures and to explore the impact of O and H diffusion, under reducing conditions, on U-Pb isotope systematics and rare earth element concentrations in uraninite. Our results show that O and H diffusion in the presence of a rare earth element-rich fluid, under reducing conditions, has no effect on rare earth element concentrations and patterns or U-Pb isotopic compositions of uraninite. Our results also show that temperature (300 to 700 degrees C) has no effect on the rare earth element patterns, indicating that the dominant control on rare earth element concentration in uraninite is the metal source(s), the ability of the fluids to transport rare earth elements without inducing fractionation, and the degree of recrystallization. These results have implications for nuclear forensics, as well as for our understanding of the genesis of uranium-bearing ore deposits.

ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: Pre-Issue Publication
Title: Rare earth element partitioning between fluids and uraninite at 50-700 degrees C
Affiliation: University of Manitoba, Department of Geological Sciences, Winnipeg, MB, Canada
Published: 20201208
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 55
Accession Number: 2021-006898
Categories: General geochemistryGeochronologyEconomic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: University of Western Ontario, CAN, CanadaGeological Survey of Canada, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202105
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