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Early­­­­–Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides

Bjørgunn H. Dalslåen, View ORCID ProfileDeta Gasser, Tor Grenne, Lars E. Augland and Arild Andresen
Geological Society, London, Special Publications, 503, 251-277, 7 July 2020, https://doi.org/10.1144/SP503-2020-37
Bjørgunn H. Dalslåen
1Department of Geosciences, University of Oslo, Sem Sælands vei 1, 0371 Oslo, Norway
Roles: [Data curation (Equal)], [Writing - Original Draft (Lead)]
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  • For correspondence: b.h.dalslaen@geo.uio.no
Deta Gasser
2Department of Environmental Sciences, Western Norway University of Applied Sciences, Røyrgata 6, 6856 Sogndal, Norway
3Geological Survey of Norway, Leiv Erikssons vei 39, 7040 Trondheim, Norway
Roles: [Supervision (Lead)], [Writing - Original Draft (Equal)]
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  • ORCID record for Deta Gasser
Tor Grenne
3Geological Survey of Norway, Leiv Erikssons vei 39, 7040 Trondheim, Norway
Roles: [Supervision (Equal)], [Writing - Original Draft (Equal)]
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Lars E. Augland
1Department of Geosciences, University of Oslo, Sem Sælands vei 1, 0371 Oslo, Norway
4Centre for Earth Evolution and Dynamics, University of Oslo, Sem Sælands vei 1, 0371 Oslo, Norway
Roles: [Data curation (Equal)]
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Arild Andresen
1Department of Geosciences, University of Oslo, Sem Sælands vei 1, 0371 Oslo, Norway
Roles: [Supervision (Equal)]
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Abstract

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.

  • © 2020 The Author(s). Published by The Geological Society of London. All rights reserved
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Geological Society, London, Special Publications: 503 (1)
Geological Society, London, Special Publications
Volume 503
2021
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Early­­­­–Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides

Bjørgunn H. Dalslåen, Deta Gasser, Tor Grenne, Lars E. Augland and Arild Andresen
Geological Society, London, Special Publications, 503, 251-277, 7 July 2020, https://doi.org/10.1144/SP503-2020-37
Bjørgunn H. Dalslåen
1Department of Geosciences, University of Oslo, Sem Sælands vei 1, 0371 Oslo, Norway
Roles: [Data curation (Equal)], [Writing - Original Draft (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: b.h.dalslaen@geo.uio.no
Deta Gasser
2Department of Environmental Sciences, Western Norway University of Applied Sciences, Røyrgata 6, 6856 Sogndal, Norway
3Geological Survey of Norway, Leiv Erikssons vei 39, 7040 Trondheim, Norway
Roles: [Supervision (Lead)], [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Deta Gasser
Tor Grenne
3Geological Survey of Norway, Leiv Erikssons vei 39, 7040 Trondheim, Norway
Roles: [Supervision (Equal)], [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Lars E. Augland
1Department of Geosciences, University of Oslo, Sem Sælands vei 1, 0371 Oslo, Norway
4Centre for Earth Evolution and Dynamics, University of Oslo, Sem Sælands vei 1, 0371 Oslo, Norway
Roles: [Data curation (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Arild Andresen
1Department of Geosciences, University of Oslo, Sem Sælands vei 1, 0371 Oslo, Norway
Roles: [Supervision (Equal)]
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  • Find this author on PubMed
  • Search for this author on this site

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Early­­­­–Middle Ordovician sedimentation and bimodal volcanism at the margin of Iapetus: the Trollhøtta–Kinna Basin of the central Norwegian Caledonides

Bjørgunn H. Dalslåen, Deta Gasser, Tor Grenne, Lars E. Augland and Arild Andresen
Geological Society, London, Special Publications, 503, 251-277, 7 July 2020, https://doi.org/10.1144/SP503-2020-37
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