Glaciogenic rocks of the Neoproterozoic Smalfjord and Mortensnes formations, Vestertana Group, E. Finnmark, Norway
The Vestertana Group in East Finnmark, North Norway, contains two Neoproterozoic glaciogenic sequences, the Smalfjord and Mortensnes formations, preserved on the northern edge of Baltica. The former comprises up to 420 m of aeolian, fluvioglacial and glaciomarine sediments and terrestrial diamictite...
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ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/74256 2023-05-15T16:13:37+02:00 Glaciogenic rocks of the Neoproterozoic Smalfjord and Mortensnes formations, Vestertana Group, E. Finnmark, Norway Rice, Alexander Hugh N. Edwards, Marc B. Hansen, Tor A. Arnaud, Emmanuelle Halverson, Galen Pippa School of Earth and Environmental Sciences 2012 http://hdl.handle.net/2440/74256 https://doi.org/10.1144/M36.57 en eng Geological Society, London, Memoirs, 2012; 36(1):593-602 0435-4052 http://hdl.handle.net/2440/74256 doi:10.1144/M36.57 © The Geological Society of London 2011 Journal article 2012 ftunivadelaidedl https://doi.org/10.1144/M36.57 2023-02-05T19:41:37Z The Vestertana Group in East Finnmark, North Norway, contains two Neoproterozoic glaciogenic sequences, the Smalfjord and Mortensnes formations, preserved on the northern edge of Baltica. The former comprises up to 420 m of aeolian, fluvioglacial and glaciomarine sediments and terrestrial diamictite. The latter consists of up to 50 m of predominantly diamictite. The Smalfjord Formation (Fm.) is underlain by dolostones (Grasdalen Fm., Tanafjorden Group), only locally preserved due to the sub-Smalfjord Fm. unconformity, which cuts down-section through a c. 2.5 km dominantly clastic sequence to rest on Baltic Shield gneisses. The two glaciogenic successions are separated by c. 350 m of mostly clastic sediments (Nyborg Fm.), with thin dolostones at the base and towards the top. The latter are generally absent due to the sub-Mortensnes Fm. unconformity, which also cuts down southwards through the Nyborg and Smalfjord formations to the Baltic Shield. No robust isotopic age constraints are available for the succession. δ13C data, together with cap dolostone characteristics, offer paradigmic correlations with other areas (Smalfjord ≡ Marinoan; Mortensnes ≡ Gaskiers). A limited Ediacaran fauna, including Aspidella, give only broad age constraints. Palaeomagnetic data are ambiguous; some suggest Baltica lay at equatorial (15°S) to mid-latitudes (50°S) for the period 750–550 Ma, respectively, while other interpretations place it at either 30°N or S at c. 550 Ma. A. Hugh N. Rice, Marc B. Edwards, Tor A. Hansen, Emmanuelle Arnaud and Galen P. Halverson Article in Journal/Newspaper Finnmark North Norway Finnmark The University of Adelaide: Digital Library Mortensnes ENVELOPE(20.269,20.269,69.581,69.581) Norway Smalfjord ENVELOPE(28.062,28.062,70.439,70.439) Tanafjorden ENVELOPE(28.391,28.391,70.747,70.747) Vestertana ENVELOPE(27.868,27.868,70.424,70.424) Geological Society, London, Memoirs 36 1 593 602 |
institution |
Open Polar |
collection |
The University of Adelaide: Digital Library |
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ftunivadelaidedl |
language |
English |
description |
The Vestertana Group in East Finnmark, North Norway, contains two Neoproterozoic glaciogenic sequences, the Smalfjord and Mortensnes formations, preserved on the northern edge of Baltica. The former comprises up to 420 m of aeolian, fluvioglacial and glaciomarine sediments and terrestrial diamictite. The latter consists of up to 50 m of predominantly diamictite. The Smalfjord Formation (Fm.) is underlain by dolostones (Grasdalen Fm., Tanafjorden Group), only locally preserved due to the sub-Smalfjord Fm. unconformity, which cuts down-section through a c. 2.5 km dominantly clastic sequence to rest on Baltic Shield gneisses. The two glaciogenic successions are separated by c. 350 m of mostly clastic sediments (Nyborg Fm.), with thin dolostones at the base and towards the top. The latter are generally absent due to the sub-Mortensnes Fm. unconformity, which also cuts down southwards through the Nyborg and Smalfjord formations to the Baltic Shield. No robust isotopic age constraints are available for the succession. δ13C data, together with cap dolostone characteristics, offer paradigmic correlations with other areas (Smalfjord ≡ Marinoan; Mortensnes ≡ Gaskiers). A limited Ediacaran fauna, including Aspidella, give only broad age constraints. Palaeomagnetic data are ambiguous; some suggest Baltica lay at equatorial (15°S) to mid-latitudes (50°S) for the period 750–550 Ma, respectively, while other interpretations place it at either 30°N or S at c. 550 Ma. A. Hugh N. Rice, Marc B. Edwards, Tor A. Hansen, Emmanuelle Arnaud and Galen P. Halverson |
author2 |
School of Earth and Environmental Sciences |
format |
Article in Journal/Newspaper |
author |
Rice, Alexander Hugh N. Edwards, Marc B. Hansen, Tor A. Arnaud, Emmanuelle Halverson, Galen Pippa |
spellingShingle |
Rice, Alexander Hugh N. Edwards, Marc B. Hansen, Tor A. Arnaud, Emmanuelle Halverson, Galen Pippa Glaciogenic rocks of the Neoproterozoic Smalfjord and Mortensnes formations, Vestertana Group, E. Finnmark, Norway |
author_facet |
Rice, Alexander Hugh N. Edwards, Marc B. Hansen, Tor A. Arnaud, Emmanuelle Halverson, Galen Pippa |
author_sort |
Rice, Alexander Hugh N. |
title |
Glaciogenic rocks of the Neoproterozoic Smalfjord and Mortensnes formations, Vestertana Group, E. Finnmark, Norway |
title_short |
Glaciogenic rocks of the Neoproterozoic Smalfjord and Mortensnes formations, Vestertana Group, E. Finnmark, Norway |
title_full |
Glaciogenic rocks of the Neoproterozoic Smalfjord and Mortensnes formations, Vestertana Group, E. Finnmark, Norway |
title_fullStr |
Glaciogenic rocks of the Neoproterozoic Smalfjord and Mortensnes formations, Vestertana Group, E. Finnmark, Norway |
title_full_unstemmed |
Glaciogenic rocks of the Neoproterozoic Smalfjord and Mortensnes formations, Vestertana Group, E. Finnmark, Norway |
title_sort |
glaciogenic rocks of the neoproterozoic smalfjord and mortensnes formations, vestertana group, e. finnmark, norway |
publishDate |
2012 |
url |
http://hdl.handle.net/2440/74256 https://doi.org/10.1144/M36.57 |
long_lat |
ENVELOPE(20.269,20.269,69.581,69.581) ENVELOPE(28.062,28.062,70.439,70.439) ENVELOPE(28.391,28.391,70.747,70.747) ENVELOPE(27.868,27.868,70.424,70.424) |
geographic |
Mortensnes Norway Smalfjord Tanafjorden Vestertana |
geographic_facet |
Mortensnes Norway Smalfjord Tanafjorden Vestertana |
genre |
Finnmark North Norway Finnmark |
genre_facet |
Finnmark North Norway Finnmark |
op_relation |
Geological Society, London, Memoirs, 2012; 36(1):593-602 0435-4052 http://hdl.handle.net/2440/74256 doi:10.1144/M36.57 |
op_rights |
© The Geological Society of London 2011 |
op_doi |
https://doi.org/10.1144/M36.57 |
container_title |
Geological Society, London, Memoirs |
container_volume |
36 |
container_issue |
1 |
container_start_page |
593 |
op_container_end_page |
602 |
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1765999413594947584 |