Early - Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides
The late Neoproterozoic–Paleozoic Iapetus Ocean developed between Laurentia, Baltica, Siberia and Gondwana. Its Paleozoic closure history is recorded by volcano-sedimentary successions within the Caledonian orogen of Scandinavia, the British Isles and Newfoundland. We present new lithological, geoch...
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ftoslouniv:oai:www.duo.uio.no:10852/83491 2023-05-15T17:22:34+02:00 Early - Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides Dalslåen, Bjørgunn Heggem Gasser, Deta Grenne, Tor Augland, Lars Eivind Andresen, Arild 2020-11-01T09:24:31Z http://hdl.handle.net/10852/83491 http://urn.nb.no/URN:NBN:no-86256 https://doi.org/10.1144/SP503-2020-37 EN eng NFR/223272 http://urn.nb.no/URN:NBN:no-86256 Dalslåen, Bjørgunn Heggem Gasser, Deta Grenne, Tor Augland, Lars Eivind Andresen, Arild . Early - Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides. Geological Society Special Publication. 2020, 503 http://hdl.handle.net/10852/83491 1843843 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Geological Society Special Publication&rft.volume=503&rft.spage=&rft.date=2020 Geological Society Special Publication 503 SP503-2020 2020-37 27 https://doi.org/10.1144/SP503-2020-37 URN:NBN:no-86256 Fulltext https://www.duo.uio.no/bitstream/handle/10852/83491/1/Dalsl%25C3%25A5en%2Bet%2Bal%2B2020%2BTrollh%25C3%25B8tta%2Baccepted%2Bmanuscript.pdf Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ CC-BY 0305-8719 Journal article Tidsskriftartikkel Peer reviewed AcceptedVersion 2020 ftoslouniv https://doi.org/10.1144/SP503-2020-37 2021-02-24T23:30:57Z The late Neoproterozoic–Paleozoic Iapetus Ocean developed between Laurentia, Baltica, Siberia and Gondwana. Its Paleozoic 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–Kinna Basin (central Norwegian Caledonides). This basin consists of alternating siliciclastic rocks, mid-ocean ridge basalts (MORBs), and felsic volcanic rocks highly enriched in, for example, Th, U and light REEs. Rhyolites from the stratigraphically upper part are dated by zircon U–Pb thermal ionization mass spectrometry to 473.3 ± 1.0 and 472.4 ± 0.7 Ma. Detrital zircon spectra indicate deposition after c. 480 Ma, with sediments derived from composite Cambro-Ordovician and Archean–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 MORBs and highly enriched rocks reflect a palaeotectonic setting hitherto unknown in the orogen. Article in Journal/Newspaper Newfoundland Siberia Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Trollhøtta ENVELOPE(9.324,9.324,62.852,62.852) Geological Society, London, Special Publications SP503-2020-37 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
The late Neoproterozoic–Paleozoic Iapetus Ocean developed between Laurentia, Baltica, Siberia and Gondwana. Its Paleozoic 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–Kinna Basin (central Norwegian Caledonides). This basin consists of alternating siliciclastic rocks, mid-ocean ridge basalts (MORBs), and felsic volcanic rocks highly enriched in, for example, Th, U and light REEs. Rhyolites from the stratigraphically upper part are dated by zircon U–Pb thermal ionization mass spectrometry to 473.3 ± 1.0 and 472.4 ± 0.7 Ma. Detrital zircon spectra indicate deposition after c. 480 Ma, with sediments derived from composite Cambro-Ordovician and Archean–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 MORBs and highly enriched rocks reflect a palaeotectonic setting hitherto unknown in the orogen. |
format |
Article in Journal/Newspaper |
author |
Dalslåen, Bjørgunn Heggem Gasser, Deta Grenne, Tor Augland, Lars Eivind Andresen, Arild |
spellingShingle |
Dalslåen, Bjørgunn Heggem Gasser, Deta Grenne, Tor Augland, Lars Eivind Andresen, Arild Early - Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides |
author_facet |
Dalslåen, Bjørgunn Heggem Gasser, Deta Grenne, Tor Augland, Lars Eivind Andresen, Arild |
author_sort |
Dalslåen, Bjørgunn Heggem |
title |
Early - Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides |
title_short |
Early - Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides |
title_full |
Early - Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides |
title_fullStr |
Early - Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides |
title_full_unstemmed |
Early - Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides |
title_sort |
early - middle ordovician sedimentation and bimodal volcanism at the margin of iapetus: the trollhøtta–kinna basin of the central norwegian caledonides |
publishDate |
2020 |
url |
http://hdl.handle.net/10852/83491 http://urn.nb.no/URN:NBN:no-86256 https://doi.org/10.1144/SP503-2020-37 |
long_lat |
ENVELOPE(9.324,9.324,62.852,62.852) |
geographic |
Trollhøtta |
geographic_facet |
Trollhøtta |
genre |
Newfoundland Siberia |
genre_facet |
Newfoundland Siberia |
op_source |
0305-8719 |
op_relation |
NFR/223272 http://urn.nb.no/URN:NBN:no-86256 Dalslåen, Bjørgunn Heggem Gasser, Deta Grenne, Tor Augland, Lars Eivind Andresen, Arild . Early - Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides. Geological Society Special Publication. 2020, 503 http://hdl.handle.net/10852/83491 1843843 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Geological Society Special Publication&rft.volume=503&rft.spage=&rft.date=2020 Geological Society Special Publication 503 SP503-2020 2020-37 27 https://doi.org/10.1144/SP503-2020-37 URN:NBN:no-86256 Fulltext https://www.duo.uio.no/bitstream/handle/10852/83491/1/Dalsl%25C3%25A5en%2Bet%2Bal%2B2020%2BTrollh%25C3%25B8tta%2Baccepted%2Bmanuscript.pdf |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1144/SP503-2020-37 |
container_title |
Geological Society, London, Special Publications |
container_start_page |
SP503-2020-37 |
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1766109289766715392 |