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Geological setting and geochemistry of uranium-rich granites in the Proterozoic of Sweden

Published online by Cambridge University Press:  05 July 2018

M. R. Wilson  and
G. V. Åkerblom
M. R. Wilson
Affiliation:
Geological Survey of Sweden, Box 801, S-951 28 Luleå, Sweden
G. V. Åkerblom
Affiliation:
Geological Survey of Sweden, Box 801, S-951 28 Luleå, Sweden
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Abstract

Uraniferous granites occur in several different geological settings in the Swedish Precambrian and represent a variety of granite types and ages. Granites with > 10 ppm U are highly differentiated leucocratic alkali granites with initial 87Sr/86Sr ratios over 0.708. They commonly show enrichment in F, Sn, W, and/or Mo, while mineralization of these dements may, in some cases, be found in the nearby country rock. Radiogenic heat from the granites may have assisted hydrothermal circulation. In only one case, Hotagen, is important U mineralization thought to be directly related to a U-rich granite, while the majority of epigenetic U mineralizations with economic potential are related to hydrothermal processes in areas where the bedrock is regionally enhanced in U.

Type
Research Article
Information
Mineralogical Magazine , Volume 46 , Issue 339 , June 1982 , pp. 233 - 245
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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