The continent-ocean (Seve-Köli) boundary in the Sarek-Padjelanta Mts. revisited : Swedish Caledonides
In the Swedish Caledonides, the continent-ocean boundary is represented by the basal thrust of the Iapetus-derived Köli Nappe Complex (KNC) which overlies the Seve Nappe Complex (SNC) derived from the outer rifted margin of Baltica and the continent-ocean transition (COT). Current maps and literatur...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Taylor & Francis
2020
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Online Access: | https://lup.lub.lu.se/record/50e2bf7a-a8d0-47cf-bbf6-3f824ea15158 https://doi.org/10.1080/11035897.2020.1748898 |
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ftulundlup:oai:lup.lub.lu.se:50e2bf7a-a8d0-47cf-bbf6-3f824ea15158 2023-05-15T17:44:57+02:00 The continent-ocean (Seve-Köli) boundary in the Sarek-Padjelanta Mts. revisited : Swedish Caledonides Andréasson, Per Gunnar 2020 https://lup.lub.lu.se/record/50e2bf7a-a8d0-47cf-bbf6-3f824ea15158 https://doi.org/10.1080/11035897.2020.1748898 eng eng Taylor & Francis https://lup.lub.lu.se/record/50e2bf7a-a8d0-47cf-bbf6-3f824ea15158 http://dx.doi.org/10.1080/11035897.2020.1748898 scopus:85087025896 GFF; 142(2), pp 125-138 (2020) ISSN: 1103-5897 Geology continent-ocean boundary eclogites Köli Sarek Scandinavian Caledonides Seve contributiontojournal/article info:eu-repo/semantics/article text 2020 ftulundlup https://doi.org/10.1080/11035897.2020.1748898 2023-02-01T23:39:54Z In the Swedish Caledonides, the continent-ocean boundary is represented by the basal thrust of the Iapetus-derived Köli Nappe Complex (KNC) which overlies the Seve Nappe Complex (SNC) derived from the outer rifted margin of Baltica and the continent-ocean transition (COT). Current maps and literature subdivide the Seve teconostratigraphy in northern Sweden (Sarek-Padjelanta region) into three mega-lenses, the lowest of which (Vaimok lens) is composed of quartz-feldspathic gneisses and subordinate marble, all hosting eclogites. It is overlain by the Sarek lens composed of a COT dyke complex and, along its western margin, a narrow belt of phyllites, schists, quartzite, marbles and greenschists. Overlying this belt is Tsäkkok lens of the same composition as the Vaimok lens. The situation with an intermediate-pressure and often excellently preserved sheeted-dyke complex intercalated between two lenses of complexly deformed high-pressure rocks invited to intricate models of accretion, including out-of-sequence stacking of slices of the continental margin during early Ordovician subduction. Based on a detailed study of a select area and examination of the evolution of previous concepts, this study reinterprets the narrow belt along the western margin of the Sarek Lens as typical of the lower KNC. The favoured explanation of the presence of intermediate-pressure Köli rocks below high-pressure Seve rocks is recumbent folding and/or mega-sheath folding of the Seve-Köli nappe sequence during Scandian (Siluro-Devonian) accretion, by analogy with the situation in places in the central Swedish Caledonides. Previous models of early out-of-sequence stacking during subduction of the continental margin need reconsideration. Article in Journal/Newspaper Northern Sweden Padjelanta Lund University Publications (LUP) Padjelanta ENVELOPE(16.950,16.950,67.450,67.450) Sarek ENVELOPE(17.500,17.500,67.350,67.350) Tsäkkok ENVELOPE(16.783,16.783,67.067,67.067) Vaimok ENVELOPE(16.896,16.896,67.033,67.033) GFF 142 2 125 138 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology continent-ocean boundary eclogites Köli Sarek Scandinavian Caledonides Seve |
spellingShingle |
Geology continent-ocean boundary eclogites Köli Sarek Scandinavian Caledonides Seve Andréasson, Per Gunnar The continent-ocean (Seve-Köli) boundary in the Sarek-Padjelanta Mts. revisited : Swedish Caledonides |
topic_facet |
Geology continent-ocean boundary eclogites Köli Sarek Scandinavian Caledonides Seve |
description |
In the Swedish Caledonides, the continent-ocean boundary is represented by the basal thrust of the Iapetus-derived Köli Nappe Complex (KNC) which overlies the Seve Nappe Complex (SNC) derived from the outer rifted margin of Baltica and the continent-ocean transition (COT). Current maps and literature subdivide the Seve teconostratigraphy in northern Sweden (Sarek-Padjelanta region) into three mega-lenses, the lowest of which (Vaimok lens) is composed of quartz-feldspathic gneisses and subordinate marble, all hosting eclogites. It is overlain by the Sarek lens composed of a COT dyke complex and, along its western margin, a narrow belt of phyllites, schists, quartzite, marbles and greenschists. Overlying this belt is Tsäkkok lens of the same composition as the Vaimok lens. The situation with an intermediate-pressure and often excellently preserved sheeted-dyke complex intercalated between two lenses of complexly deformed high-pressure rocks invited to intricate models of accretion, including out-of-sequence stacking of slices of the continental margin during early Ordovician subduction. Based on a detailed study of a select area and examination of the evolution of previous concepts, this study reinterprets the narrow belt along the western margin of the Sarek Lens as typical of the lower KNC. The favoured explanation of the presence of intermediate-pressure Köli rocks below high-pressure Seve rocks is recumbent folding and/or mega-sheath folding of the Seve-Köli nappe sequence during Scandian (Siluro-Devonian) accretion, by analogy with the situation in places in the central Swedish Caledonides. Previous models of early out-of-sequence stacking during subduction of the continental margin need reconsideration. |
format |
Article in Journal/Newspaper |
author |
Andréasson, Per Gunnar |
author_facet |
Andréasson, Per Gunnar |
author_sort |
Andréasson, Per Gunnar |
title |
The continent-ocean (Seve-Köli) boundary in the Sarek-Padjelanta Mts. revisited : Swedish Caledonides |
title_short |
The continent-ocean (Seve-Köli) boundary in the Sarek-Padjelanta Mts. revisited : Swedish Caledonides |
title_full |
The continent-ocean (Seve-Köli) boundary in the Sarek-Padjelanta Mts. revisited : Swedish Caledonides |
title_fullStr |
The continent-ocean (Seve-Köli) boundary in the Sarek-Padjelanta Mts. revisited : Swedish Caledonides |
title_full_unstemmed |
The continent-ocean (Seve-Köli) boundary in the Sarek-Padjelanta Mts. revisited : Swedish Caledonides |
title_sort |
continent-ocean (seve-köli) boundary in the sarek-padjelanta mts. revisited : swedish caledonides |
publisher |
Taylor & Francis |
publishDate |
2020 |
url |
https://lup.lub.lu.se/record/50e2bf7a-a8d0-47cf-bbf6-3f824ea15158 https://doi.org/10.1080/11035897.2020.1748898 |
long_lat |
ENVELOPE(16.950,16.950,67.450,67.450) ENVELOPE(17.500,17.500,67.350,67.350) ENVELOPE(16.783,16.783,67.067,67.067) ENVELOPE(16.896,16.896,67.033,67.033) |
geographic |
Padjelanta Sarek Tsäkkok Vaimok |
geographic_facet |
Padjelanta Sarek Tsäkkok Vaimok |
genre |
Northern Sweden Padjelanta |
genre_facet |
Northern Sweden Padjelanta |
op_source |
GFF; 142(2), pp 125-138 (2020) ISSN: 1103-5897 |
op_relation |
https://lup.lub.lu.se/record/50e2bf7a-a8d0-47cf-bbf6-3f824ea15158 http://dx.doi.org/10.1080/11035897.2020.1748898 scopus:85087025896 |
op_doi |
https://doi.org/10.1080/11035897.2020.1748898 |
container_title |
GFF |
container_volume |
142 |
container_issue |
2 |
container_start_page |
125 |
op_container_end_page |
138 |
_version_ |
1766147646603395072 |