| Reference Type | Journal (article/letter/editorial) |
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| Title | The mineralogy and genesis of uranium in rhyolitic ignimbrites of precambrian age from Duobblon, Sweden |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Smellie, John A. T. | Author |
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| Year | 1982 (June) | Volume | 46 |
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| Issue | 339 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_46/46-339-187.pdf+ |
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| DOI | doi:10.1180/minmag.1982.046.339.05Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3383 | Long-form Identifier | mindat:1:5:3383:5 |
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| GUID | 0 |
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| Full Reference | Smellie, John A. T. (1982) The mineralogy and genesis of uranium in rhyolitic ignimbrites of precambrian age from Duobblon, Sweden. Mineralogical Magazine, 46 (339) 187-199 doi:10.1180/minmag.1982.046.339.05 |
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| Plain Text | Smellie, John A. T. (1982) The mineralogy and genesis of uranium in rhyolitic ignimbrites of precambrian age from Duobblon, Sweden. Mineralogical Magazine, 46 (339) 187-199 doi:10.1180/minmag.1982.046.339.05 |
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| In | (1982, June) Mineralogical Magazine Vol. 46 (339) Mineralogical Society |
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| Abstract/Notes | AbstractThe Duobblon rhyolitic ignimbrites, of middle Precambrian age are 60 m thick. They consist of at least three flows with varying degrees of welding and have undergone devitrification, producing lithophysal and spherulitic textures. They are overlain by thick fluviatile red-bed-type conglomerates and sandstones, which in turn are capped by terrestrial acid volcanics.Uranium enrichments of up to 3000 ppm U occur within two or three peneconcordant tabular horizons which are mostly lithophysae-bearing. Fission-track investigations of the ignimbrites and overlying conglomerates and sandstones, which supplement earlier mineralogical studies, show that U occurs as fine pitchblende disseminations; as complex uranotitanates associated with Fe-Ti-Mn oxides; and as coatings associated with matrix sericite. Small amounts of O are present in such primary accessory minerals as sphene, apatite, and zircon.It is suggested that oxidizing U-bearing solutions, generated partly during devitrification of the ignimbrites and partly from the overlying volcano-sedimentary pile, produced the U enrichments with later sulphide deposition, along the more permeable lithophysal horizons in the ignimbrites. |
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