Uranium mineralization in the Alum Shale Formation (Sweden): Evolution of a U-rich marine black shale from sedimentation to metamorphism
International audience The Alum Shale Formation is a metal-rich black shale, deposited on the Baltoscandian platform between Middle Cambrian and Early Ordovician. These black shales may be of particular economic interest for their relatively high uranium content (100–300 ppm) and their wide distribu...
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ftinsu:oai:HAL:hal-02376740v2 2023-06-18T03:42:18+02:00 Uranium mineralization in the Alum Shale Formation (Sweden): Evolution of a U-rich marine black shale from sedimentation to metamorphism Lecomte, Andreï Cathelineau, Michel Michels, Raymond Peiffert, Chantal Brouand, Marc GeoRessources Institut national des sciences de l'Univers (INSU - CNRS)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Département Géosciences (AREVA-BU Mines) Groupe AREVA 2017 https://hal.science/hal-02376740 https://hal.science/hal-02376740v2/document https://hal.science/hal-02376740v2/file/Lecomte%20et%20al%20Alum%20Shale%20Ore%20Geol%20Review%202017.pdf https://doi.org/10.1016/j.oregeorev.2017.04.021 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.oregeorev.2017.04.021 hal-02376740 https://hal.science/hal-02376740 https://hal.science/hal-02376740v2/document https://hal.science/hal-02376740v2/file/Lecomte%20et%20al%20Alum%20Shale%20Ore%20Geol%20Review%202017.pdf doi:10.1016/j.oregeorev.2017.04.021 info:eu-repo/semantics/OpenAccess ISSN: 0169-1368 Ore Geology Reviews https://hal.science/hal-02376740 Ore Geology Reviews, 2017, 88, pp.71-98. ⟨10.1016/j.oregeorev.2017.04.021⟩ Uranium Alum Shale Organic matter Metamorphism Fluid inclusions Hydrocarbons [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography info:eu-repo/semantics/article Journal articles 2017 ftinsu https://doi.org/10.1016/j.oregeorev.2017.04.021 2023-06-05T23:26:23Z International audience The Alum Shale Formation is a metal-rich black shale, deposited on the Baltoscandian platform between Middle Cambrian and Early Ordovician. These black shales may be of particular economic interest for their relatively high uranium content (100–300 ppm) and their wide distribution from Norway to Estonia. Scandinavian Alum Shale may thus constitute a great potential resource of uranium, as a low grade ore. The Alum Shale Formation is particularly interesting to study the mineralogical expression and content of uranium in series submitted to progressive burial and metamorphism. For this purpose, the behavior of U, P, Ti and organic matter was studied on a series of representative samples from most Alum Shale prospection zones. In southern Sweden, where Alum Shale underwent fairly shallow burial, uranium concentrations have no mineralogical expression except a rather high U content of biogenic phosphates. Calcite concretions (beefs) and fractures recorded the migration of hot overpressured hydrocarbons and brines from thermally mature areas to immature Alum Shale. However, thermal maturation and fluid migration did not allow remobilization of uranium and metals. At the opposite, in northern Sweden, where the series were folded, duplicated and submitted to low grade Greenschist metamorphism during Caledonian orogeny, phospho-silicates U-Si-Ca-P (±Ti ±Zr ±Y) and minor amounts of uraninite are identified and indicate that U, P, and Ti were mobile and precipitated as new phases. The effect of metamorphism is therefore important to consider as the leachability of U, especially during (bio)-hydrometallurgical processes, which will be by far different between the two considered areas. Article in Journal/Newspaper Northern Sweden Institut national des sciences de l'Univers: HAL-INSU Norway Ore Geology Reviews 88 71 98 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Uranium Alum Shale Organic matter Metamorphism Fluid inclusions Hydrocarbons [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography |
spellingShingle |
Uranium Alum Shale Organic matter Metamorphism Fluid inclusions Hydrocarbons [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography Lecomte, Andreï Cathelineau, Michel Michels, Raymond Peiffert, Chantal Brouand, Marc Uranium mineralization in the Alum Shale Formation (Sweden): Evolution of a U-rich marine black shale from sedimentation to metamorphism |
topic_facet |
Uranium Alum Shale Organic matter Metamorphism Fluid inclusions Hydrocarbons [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography |
description |
International audience The Alum Shale Formation is a metal-rich black shale, deposited on the Baltoscandian platform between Middle Cambrian and Early Ordovician. These black shales may be of particular economic interest for their relatively high uranium content (100–300 ppm) and their wide distribution from Norway to Estonia. Scandinavian Alum Shale may thus constitute a great potential resource of uranium, as a low grade ore. The Alum Shale Formation is particularly interesting to study the mineralogical expression and content of uranium in series submitted to progressive burial and metamorphism. For this purpose, the behavior of U, P, Ti and organic matter was studied on a series of representative samples from most Alum Shale prospection zones. In southern Sweden, where Alum Shale underwent fairly shallow burial, uranium concentrations have no mineralogical expression except a rather high U content of biogenic phosphates. Calcite concretions (beefs) and fractures recorded the migration of hot overpressured hydrocarbons and brines from thermally mature areas to immature Alum Shale. However, thermal maturation and fluid migration did not allow remobilization of uranium and metals. At the opposite, in northern Sweden, where the series were folded, duplicated and submitted to low grade Greenschist metamorphism during Caledonian orogeny, phospho-silicates U-Si-Ca-P (±Ti ±Zr ±Y) and minor amounts of uraninite are identified and indicate that U, P, and Ti were mobile and precipitated as new phases. The effect of metamorphism is therefore important to consider as the leachability of U, especially during (bio)-hydrometallurgical processes, which will be by far different between the two considered areas. |
author2 |
GeoRessources Institut national des sciences de l'Univers (INSU - CNRS)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Département Géosciences (AREVA-BU Mines) Groupe AREVA |
format |
Article in Journal/Newspaper |
author |
Lecomte, Andreï Cathelineau, Michel Michels, Raymond Peiffert, Chantal Brouand, Marc |
author_facet |
Lecomte, Andreï Cathelineau, Michel Michels, Raymond Peiffert, Chantal Brouand, Marc |
author_sort |
Lecomte, Andreï |
title |
Uranium mineralization in the Alum Shale Formation (Sweden): Evolution of a U-rich marine black shale from sedimentation to metamorphism |
title_short |
Uranium mineralization in the Alum Shale Formation (Sweden): Evolution of a U-rich marine black shale from sedimentation to metamorphism |
title_full |
Uranium mineralization in the Alum Shale Formation (Sweden): Evolution of a U-rich marine black shale from sedimentation to metamorphism |
title_fullStr |
Uranium mineralization in the Alum Shale Formation (Sweden): Evolution of a U-rich marine black shale from sedimentation to metamorphism |
title_full_unstemmed |
Uranium mineralization in the Alum Shale Formation (Sweden): Evolution of a U-rich marine black shale from sedimentation to metamorphism |
title_sort |
uranium mineralization in the alum shale formation (sweden): evolution of a u-rich marine black shale from sedimentation to metamorphism |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-02376740 https://hal.science/hal-02376740v2/document https://hal.science/hal-02376740v2/file/Lecomte%20et%20al%20Alum%20Shale%20Ore%20Geol%20Review%202017.pdf https://doi.org/10.1016/j.oregeorev.2017.04.021 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
ISSN: 0169-1368 Ore Geology Reviews https://hal.science/hal-02376740 Ore Geology Reviews, 2017, 88, pp.71-98. ⟨10.1016/j.oregeorev.2017.04.021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.oregeorev.2017.04.021 hal-02376740 https://hal.science/hal-02376740 https://hal.science/hal-02376740v2/document https://hal.science/hal-02376740v2/file/Lecomte%20et%20al%20Alum%20Shale%20Ore%20Geol%20Review%202017.pdf doi:10.1016/j.oregeorev.2017.04.021 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.oregeorev.2017.04.021 |
container_title |
Ore Geology Reviews |
container_volume |
88 |
container_start_page |
71 |
op_container_end_page |
98 |
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1769008201689202688 |