Early to Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: The Trollhøtta–Kinna basin of the Central Norwegian Caledonides
The late Neoproterozoic to Palaeozoic Iapetus Ocean developed between Laurentia, Baltica, Siberia and Gondwana. Its Palaeozoic closure history is recorded by volcano-sedimentary successions within the Caledonian orogen of Scandinavia, the British Isles and Newfoundland. We present new lithological,...
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Geological Society of London
2021
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ftdatacite:10.6084/m9.figshare.c.4990752.v2 2023-05-15T17:22:33+02:00 Early to Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: The Trollhøtta–Kinna basin of the Central Norwegian Caledonides Bjørgunn H. Dalsåen Deta Gasser Grenne, Tor Augland, Lars E. Andresen, Arild 2021 https://dx.doi.org/10.6084/m9.figshare.c.4990752.v2 https://geolsoc.figshare.com/collections/Early_to_Middle_Ordovician_sedimentation_and_bimodal_volcanism_at_the_margin_of_Iapetus_The_Trollh_tta_Kinna_basin_of_the_Central_Norwegian_Caledonides/4990752/2 unknown Geological Society of London https://dx.doi.org/10.1144/sp503-2020-37 https://dx.doi.org/10.6084/m9.figshare.c.4990752 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2021 ftdatacite https://doi.org/10.6084/m9.figshare.c.4990752.v2 https://doi.org/10.1144/sp503-2020-37 https://doi.org/10.6084/m9.figshare.c.4990752 2021-11-05T12:55:41Z The late Neoproterozoic to Palaeozoic Iapetus Ocean developed between Laurentia, Baltica, Siberia and Gondwana. Its Palaeozoic closure history is recorded by volcano-sedimentary successions within the Caledonian orogen of Scandinavia, the British Isles and Newfoundland. We present new lithological, geochemical and geochronological data relevant for the Iapetan closure history from the hitherto poorly known Trollhøtta–19 Kinna basin (central Norwegian Caledonides). This basin consists of alternating siliciclastic rocks, MORB, and felsic volcanic rocks highly enriched in e.g. Th, U and LREE. Rhyolites from the stratigraphically upper part are dated by zircon U-Pb TIMS to 473.3 ± 1.0 and 472.4 ± 0.7 Ma. Detrital zircon spectra indicate deposition after ~480 Ma, with sediments derived from composite Cambro-Ordovician and Archean to Neoproterozoic landmass(es), possibly the Laurentian margin or a related microcontinent. The peculiar bimodal volcanic association is interpreted as an intermittent phase of marginal basin rifting, derived from a heterogeneous mantle source previously metasomatized by continental material. The tectonic mechanisms behind rifting could be slab retreat and/or break-off, or far-field tectonic forces within the Iapetan realm. Comparison of this basin with other Iapetus-related, similarly-aged volcano-sedimentary successions along the Caledonian–Appalachian orogen indicate that the bimodal MORB and highly enriched rocks reflect a palaeotectonic setting hitherto unknown in the orogen. Article in Journal/Newspaper Newfoundland Siberia DataCite Metadata Store (German National Library of Science and Technology) Trollhøtta ENVELOPE(9.324,9.324,62.852,62.852) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences Bjørgunn H. Dalsåen Deta Gasser Grenne, Tor Augland, Lars E. Andresen, Arild Early to Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: The Trollhøtta–Kinna basin of the Central Norwegian Caledonides |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
The late Neoproterozoic to Palaeozoic Iapetus Ocean developed between Laurentia, Baltica, Siberia and Gondwana. Its Palaeozoic closure history is recorded by volcano-sedimentary successions within the Caledonian orogen of Scandinavia, the British Isles and Newfoundland. We present new lithological, geochemical and geochronological data relevant for the Iapetan closure history from the hitherto poorly known Trollhøtta–19 Kinna basin (central Norwegian Caledonides). This basin consists of alternating siliciclastic rocks, MORB, and felsic volcanic rocks highly enriched in e.g. Th, U and LREE. Rhyolites from the stratigraphically upper part are dated by zircon U-Pb TIMS to 473.3 ± 1.0 and 472.4 ± 0.7 Ma. Detrital zircon spectra indicate deposition after ~480 Ma, with sediments derived from composite Cambro-Ordovician and Archean to Neoproterozoic landmass(es), possibly the Laurentian margin or a related microcontinent. The peculiar bimodal volcanic association is interpreted as an intermittent phase of marginal basin rifting, derived from a heterogeneous mantle source previously metasomatized by continental material. The tectonic mechanisms behind rifting could be slab retreat and/or break-off, or far-field tectonic forces within the Iapetan realm. Comparison of this basin with other Iapetus-related, similarly-aged volcano-sedimentary successions along the Caledonian–Appalachian orogen indicate that the bimodal MORB and highly enriched rocks reflect a palaeotectonic setting hitherto unknown in the orogen. |
format |
Article in Journal/Newspaper |
author |
Bjørgunn H. Dalsåen Deta Gasser Grenne, Tor Augland, Lars E. Andresen, Arild |
author_facet |
Bjørgunn H. Dalsåen Deta Gasser Grenne, Tor Augland, Lars E. Andresen, Arild |
author_sort |
Bjørgunn H. Dalsåen |
title |
Early to Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: The Trollhøtta–Kinna basin of the Central Norwegian Caledonides |
title_short |
Early to Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: The Trollhøtta–Kinna basin of the Central Norwegian Caledonides |
title_full |
Early to Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: The Trollhøtta–Kinna basin of the Central Norwegian Caledonides |
title_fullStr |
Early to Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: The Trollhøtta–Kinna basin of the Central Norwegian Caledonides |
title_full_unstemmed |
Early to Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: The Trollhøtta–Kinna basin of the Central Norwegian Caledonides |
title_sort |
early to middle ordovician sedimentation and bimodal volcanism at the margin of iapetus: the trollhøtta–kinna basin of the central norwegian caledonides |
publisher |
Geological Society of London |
publishDate |
2021 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.4990752.v2 https://geolsoc.figshare.com/collections/Early_to_Middle_Ordovician_sedimentation_and_bimodal_volcanism_at_the_margin_of_Iapetus_The_Trollh_tta_Kinna_basin_of_the_Central_Norwegian_Caledonides/4990752/2 |
long_lat |
ENVELOPE(9.324,9.324,62.852,62.852) |
geographic |
Trollhøtta |
geographic_facet |
Trollhøtta |
genre |
Newfoundland Siberia |
genre_facet |
Newfoundland Siberia |
op_relation |
https://dx.doi.org/10.1144/sp503-2020-37 https://dx.doi.org/10.6084/m9.figshare.c.4990752 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.4990752.v2 https://doi.org/10.1144/sp503-2020-37 https://doi.org/10.6084/m9.figshare.c.4990752 |
_version_ |
1766109272928681984 |