Phanerozoic uranium mineralization in Variscan Europe – More than 400 Ma of tectonic, supergene, and climate-controlled uranium redistribution
Silurian organic-rich black shales are widespread and serve as basic source for most U mineralization throughout the entire Variscan Orogen of Central and Western Europe. In particular the lowermost unit of Silurian black shales is regionally strongly enriched in U. The strong U-enrichment of these...
Published in: | Ore Geology Reviews |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2018
|
Subjects: | |
Online Access: | https://gfzpublic.gfz-potsdam.de/pubman/item/item_3742903 |
id |
ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_3742903 |
---|---|
record_format |
openpolar |
spelling |
ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_3742903 2023-05-15T16:41:26+02:00 Phanerozoic uranium mineralization in Variscan Europe – More than 400 Ma of tectonic, supergene, and climate-controlled uranium redistribution Romer, R. Cuney, M. 2018 https://gfzpublic.gfz-potsdam.de/pubman/item/item_3742903 unknown info:eu-repo/semantics/altIdentifier/doi/10.1016/j.oregeorev.2018.09.013 info:eu-repo/semantics/altIdentifier/urn/http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.1016/j.oregeorev.2018.09.013 https://gfzpublic.gfz-potsdam.de/pubman/item/item_3742903 Ore geology reviews info:eu-repo/semantics/article 2018 ftgfzpotsdam https://doi.org/10.1016/j.oregeorev.2018.09.013 2022-09-14T05:56:38Z Silurian organic-rich black shales are widespread and serve as basic source for most U mineralization throughout the entire Variscan Orogen of Central and Western Europe. In particular the lowermost unit of Silurian black shales is regionally strongly enriched in U. The strong U-enrichment of these shales is the result of the Hirnantian glaciation that removed old near-surface rocks that already had lost most leachable U during long-lasting alteration and brought rocks with leachable U to the surface. Sea level rise due to the melting of the Hirnantian ice sheet inundated the glacially modeled continent margin and resulted in regionally restricted oceanic circulation and anoxic conditions that are related to both low initial oxygen levels and sudden increase of organic production. Organic-rich shales on the Gondwana shelf developed particularly high U content as they scavenged U from the surface runoff that was leached after deglaciation from the newly exposed drainage area. The present spatial distribution of Silurian U-rich black shales within the Varisan orogenic belt is largely controlled by large-scale tectonic processes operating during the approach and eventual collision of Gondwana and Laurussia, leading to the formation of western Pangea. During the Variscan orogeny, these U-anomalous rocks became stacked and folded at the margins of some low-strain domains of the orogenic belt and exposed to metamorphism and in part to crustal melting – contributing to the formation of U-fertile post-kinematic granites – in the high-strain domains of the orogenic belt. There are no U deposits that are directly related to the emplacement of these granites. Variscan granites, however, are the most important source of leachable U for younger, major U mineralization. Late-Variscan reorganization of the plate movement between Gondwana and Laurussia resulted in an extensional tectonic regime throughout Europe with important Permian sedimentary basins. Heat input and fluid migration along Permian fault zones resulted in the ... Article in Journal/Newspaper Ice Sheet GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Ore Geology Reviews 102 474 504 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
description |
Silurian organic-rich black shales are widespread and serve as basic source for most U mineralization throughout the entire Variscan Orogen of Central and Western Europe. In particular the lowermost unit of Silurian black shales is regionally strongly enriched in U. The strong U-enrichment of these shales is the result of the Hirnantian glaciation that removed old near-surface rocks that already had lost most leachable U during long-lasting alteration and brought rocks with leachable U to the surface. Sea level rise due to the melting of the Hirnantian ice sheet inundated the glacially modeled continent margin and resulted in regionally restricted oceanic circulation and anoxic conditions that are related to both low initial oxygen levels and sudden increase of organic production. Organic-rich shales on the Gondwana shelf developed particularly high U content as they scavenged U from the surface runoff that was leached after deglaciation from the newly exposed drainage area. The present spatial distribution of Silurian U-rich black shales within the Varisan orogenic belt is largely controlled by large-scale tectonic processes operating during the approach and eventual collision of Gondwana and Laurussia, leading to the formation of western Pangea. During the Variscan orogeny, these U-anomalous rocks became stacked and folded at the margins of some low-strain domains of the orogenic belt and exposed to metamorphism and in part to crustal melting – contributing to the formation of U-fertile post-kinematic granites – in the high-strain domains of the orogenic belt. There are no U deposits that are directly related to the emplacement of these granites. Variscan granites, however, are the most important source of leachable U for younger, major U mineralization. Late-Variscan reorganization of the plate movement between Gondwana and Laurussia resulted in an extensional tectonic regime throughout Europe with important Permian sedimentary basins. Heat input and fluid migration along Permian fault zones resulted in the ... |
format |
Article in Journal/Newspaper |
author |
Romer, R. Cuney, M. |
spellingShingle |
Romer, R. Cuney, M. Phanerozoic uranium mineralization in Variscan Europe – More than 400 Ma of tectonic, supergene, and climate-controlled uranium redistribution |
author_facet |
Romer, R. Cuney, M. |
author_sort |
Romer, R. |
title |
Phanerozoic uranium mineralization in Variscan Europe – More than 400 Ma of tectonic, supergene, and climate-controlled uranium redistribution |
title_short |
Phanerozoic uranium mineralization in Variscan Europe – More than 400 Ma of tectonic, supergene, and climate-controlled uranium redistribution |
title_full |
Phanerozoic uranium mineralization in Variscan Europe – More than 400 Ma of tectonic, supergene, and climate-controlled uranium redistribution |
title_fullStr |
Phanerozoic uranium mineralization in Variscan Europe – More than 400 Ma of tectonic, supergene, and climate-controlled uranium redistribution |
title_full_unstemmed |
Phanerozoic uranium mineralization in Variscan Europe – More than 400 Ma of tectonic, supergene, and climate-controlled uranium redistribution |
title_sort |
phanerozoic uranium mineralization in variscan europe – more than 400 ma of tectonic, supergene, and climate-controlled uranium redistribution |
publishDate |
2018 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_3742903 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Ore geology reviews |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.oregeorev.2018.09.013 info:eu-repo/semantics/altIdentifier/urn/http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.1016/j.oregeorev.2018.09.013 https://gfzpublic.gfz-potsdam.de/pubman/item/item_3742903 |
op_doi |
https://doi.org/10.1016/j.oregeorev.2018.09.013 |
container_title |
Ore Geology Reviews |
container_volume |
102 |
container_start_page |
474 |
op_container_end_page |
504 |
_version_ |
1766031861173190656 |