Geochemical signature of Ordovician Mn-rich sedimentary rocks on the Avalonian shelf
Mn-rich (3.26–15.6 wt.% MnO) sedimentary layers (coticules, Strohschiefer) occur in Ordovician siliciclastic sedimentary rocks that were deposited on the Avalonian shelf and subsequently metamorphosed between 340 and 380 Ma. The Mn-rich layers formed during periods of restricted clastic input, when...
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crcansciencepubl:10.1139/e10-092 2024-09-15T17:57:56+00:00 Geochemical signature of Ordovician Mn-rich sedimentary rocks on the Avalonian shelf Romer, Rolf L. Kirsch, Moritz Kroner, Uwe Murphy, Brendan 2011 http://dx.doi.org/10.1139/e10-092 http://www.nrcresearchpress.com/doi/full-xml/10.1139/e10-092 http://www.nrcresearchpress.com/doi/pdf/10.1139/e10-092 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 48, issue 4, page 703-718 ISSN 0008-4077 1480-3313 journal-article 2011 crcansciencepubl https://doi.org/10.1139/e10-092 2024-07-25T04:10:03Z Mn-rich (3.26–15.6 wt.% MnO) sedimentary layers (coticules, Strohschiefer) occur in Ordovician siliciclastic sedimentary rocks that were deposited on the Avalonian shelf and subsequently metamorphosed between 340 and 380 Ma. The Mn-rich layers formed during periods of restricted clastic input, when Mn concentrated by a redox-controlled dissolution–precipitation process near the sediment–water interface, comparable to recent Mn-crusts in the boreal settings of the Baltic Sea, the Barents Sea, and the Kara Sea. Enhanced clastic sedimentation brought the process to a halt and buried the Mn-rich layers. Formation of Mn-rich layers resumed upon renewed reduction in clastic input. Nd and Sr isotope data exclude a volcanic or hydrothermal derivation of Mn. Instead, Mn input occurred via rivers from the continental crust. The Nd isotopic composition and geochemical fingerprints of Mn-rich and hosting Mn-poor sedimentary rocks suggests that the clastic input was dominated by material derived from Gondwana rather than from Avalonia. The occurrence of coticules, however, seems to be restricted to the Avalonian shelf. Article in Journal/Newspaper Barents Sea Kara Sea Canadian Science Publishing Canadian Journal of Earth Sciences 48 4 703 718 |
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Open Polar |
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Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Mn-rich (3.26–15.6 wt.% MnO) sedimentary layers (coticules, Strohschiefer) occur in Ordovician siliciclastic sedimentary rocks that were deposited on the Avalonian shelf and subsequently metamorphosed between 340 and 380 Ma. The Mn-rich layers formed during periods of restricted clastic input, when Mn concentrated by a redox-controlled dissolution–precipitation process near the sediment–water interface, comparable to recent Mn-crusts in the boreal settings of the Baltic Sea, the Barents Sea, and the Kara Sea. Enhanced clastic sedimentation brought the process to a halt and buried the Mn-rich layers. Formation of Mn-rich layers resumed upon renewed reduction in clastic input. Nd and Sr isotope data exclude a volcanic or hydrothermal derivation of Mn. Instead, Mn input occurred via rivers from the continental crust. The Nd isotopic composition and geochemical fingerprints of Mn-rich and hosting Mn-poor sedimentary rocks suggests that the clastic input was dominated by material derived from Gondwana rather than from Avalonia. The occurrence of coticules, however, seems to be restricted to the Avalonian shelf. |
author2 |
Murphy, Brendan |
format |
Article in Journal/Newspaper |
author |
Romer, Rolf L. Kirsch, Moritz Kroner, Uwe |
spellingShingle |
Romer, Rolf L. Kirsch, Moritz Kroner, Uwe Geochemical signature of Ordovician Mn-rich sedimentary rocks on the Avalonian shelf |
author_facet |
Romer, Rolf L. Kirsch, Moritz Kroner, Uwe |
author_sort |
Romer, Rolf L. |
title |
Geochemical signature of Ordovician Mn-rich sedimentary rocks on the Avalonian shelf |
title_short |
Geochemical signature of Ordovician Mn-rich sedimentary rocks on the Avalonian shelf |
title_full |
Geochemical signature of Ordovician Mn-rich sedimentary rocks on the Avalonian shelf |
title_fullStr |
Geochemical signature of Ordovician Mn-rich sedimentary rocks on the Avalonian shelf |
title_full_unstemmed |
Geochemical signature of Ordovician Mn-rich sedimentary rocks on the Avalonian shelf |
title_sort |
geochemical signature of ordovician mn-rich sedimentary rocks on the avalonian shelf |
publisher |
Canadian Science Publishing |
publishDate |
2011 |
url |
http://dx.doi.org/10.1139/e10-092 http://www.nrcresearchpress.com/doi/full-xml/10.1139/e10-092 http://www.nrcresearchpress.com/doi/pdf/10.1139/e10-092 |
genre |
Barents Sea Kara Sea |
genre_facet |
Barents Sea Kara Sea |
op_source |
Canadian Journal of Earth Sciences volume 48, issue 4, page 703-718 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e10-092 |
container_title |
Canadian Journal of Earth Sciences |
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48 |
container_issue |
4 |
container_start_page |
703 |
op_container_end_page |
718 |
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1810434154454581248 |