Influence of a rigid backstop on the flow pattern during thrusting of the supracrustal Balsfjord Series of the North Norwegian Caledonides

The Caledonian evolution of the low–medium grade Balsfjord Series (Troms, Northern Norway) is characterized by four sets of deformation structures that developed progressively during burial and exhumation from underneath the high-grade Nakkedal and Tromsø nappe complexes. The Balsfjord Series common...

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Published in:Journal of Structural Geology
Main Authors: Höpfl, Stephan Maximilian, Konopásek, Jiří, Sláma, Jiří
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2024
Subjects:
Online Access:https://hdl.handle.net/10037/33321
https://doi.org/10.1016/j.jsg.2024.105102
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spelling ftunivtroemsoe:oai:munin.uit.no:10037/33321 2024-04-28T08:14:09+00:00 Influence of a rigid backstop on the flow pattern during thrusting of the supracrustal Balsfjord Series of the North Norwegian Caledonides Höpfl, Stephan Maximilian Konopásek, Jiří Sláma, Jiří 2024-03-17 https://hdl.handle.net/10037/33321 https://doi.org/10.1016/j.jsg.2024.105102 eng eng Elsevier Journal of Structural Geology Höpfl S, Konopásek J, Sláma J. Influence of a rigid backstop on the flow pattern during thrusting of the supracrustal Balsfjord Series of the North Norwegian Caledonides. Journal of Structural Geology. 2024;182 FRIDAID 2257871 doi:10.1016/j.jsg.2024.105102 0191-8141 1873-1201 https://hdl.handle.net/10037/33321 Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2024 The Author(s) https://creativecommons.org/licenses/by/4.0 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2024 ftunivtroemsoe https://doi.org/10.1016/j.jsg.2024.105102 2024-04-09T23:34:20Z The Caledonian evolution of the low–medium grade Balsfjord Series (Troms, Northern Norway) is characterized by four sets of deformation structures that developed progressively during burial and exhumation from underneath the high-grade Nakkedal and Tromsø nappe complexes. The Balsfjord Series commonly displays top-to-the SSE–SE directed movement during the development of the main metamorphic fabric with local folding at different evolutionary stages. However, we document a structural horizon within the Balsfjord Series showing a strong reorientation of the regional stretching lineation from NW–SE to E–W and finally NE–SW. This rotation occurred during exhumation and is interpreted as a lateral escape mechanism resulting from thrusting of the rheologically soft Balsfjord Series against the rigid backstop of the Lyngen Magmatic Complex and the Mauken Window basement. U–Pb dating of titanite from shear zones within the West Troms Basement Complex yielded an age of 429 ± 5 Ma interpreted as the age of thrusting of the overlying Balsfjord Series. To account for all field relationships with the overlying and underlying units, we interpret the tectonic evolution of the Balsfjord Series as a result of an interaction of two sutures active at ca. 430 Ma. Article in Journal/Newspaper Balsfjord Lyngen Northern Norway Tromsø Lyngen Troms University of Tromsø: Munin Open Research Archive Journal of Structural Geology 182 105102
institution Open Polar
collection University of Tromsø: Munin Open Research Archive
op_collection_id ftunivtroemsoe
language English
description The Caledonian evolution of the low–medium grade Balsfjord Series (Troms, Northern Norway) is characterized by four sets of deformation structures that developed progressively during burial and exhumation from underneath the high-grade Nakkedal and Tromsø nappe complexes. The Balsfjord Series commonly displays top-to-the SSE–SE directed movement during the development of the main metamorphic fabric with local folding at different evolutionary stages. However, we document a structural horizon within the Balsfjord Series showing a strong reorientation of the regional stretching lineation from NW–SE to E–W and finally NE–SW. This rotation occurred during exhumation and is interpreted as a lateral escape mechanism resulting from thrusting of the rheologically soft Balsfjord Series against the rigid backstop of the Lyngen Magmatic Complex and the Mauken Window basement. U–Pb dating of titanite from shear zones within the West Troms Basement Complex yielded an age of 429 ± 5 Ma interpreted as the age of thrusting of the overlying Balsfjord Series. To account for all field relationships with the overlying and underlying units, we interpret the tectonic evolution of the Balsfjord Series as a result of an interaction of two sutures active at ca. 430 Ma.
format Article in Journal/Newspaper
author Höpfl, Stephan Maximilian
Konopásek, Jiří
Sláma, Jiří
spellingShingle Höpfl, Stephan Maximilian
Konopásek, Jiří
Sláma, Jiří
Influence of a rigid backstop on the flow pattern during thrusting of the supracrustal Balsfjord Series of the North Norwegian Caledonides
author_facet Höpfl, Stephan Maximilian
Konopásek, Jiří
Sláma, Jiří
author_sort Höpfl, Stephan Maximilian
title Influence of a rigid backstop on the flow pattern during thrusting of the supracrustal Balsfjord Series of the North Norwegian Caledonides
title_short Influence of a rigid backstop on the flow pattern during thrusting of the supracrustal Balsfjord Series of the North Norwegian Caledonides
title_full Influence of a rigid backstop on the flow pattern during thrusting of the supracrustal Balsfjord Series of the North Norwegian Caledonides
title_fullStr Influence of a rigid backstop on the flow pattern during thrusting of the supracrustal Balsfjord Series of the North Norwegian Caledonides
title_full_unstemmed Influence of a rigid backstop on the flow pattern during thrusting of the supracrustal Balsfjord Series of the North Norwegian Caledonides
title_sort influence of a rigid backstop on the flow pattern during thrusting of the supracrustal balsfjord series of the north norwegian caledonides
publisher Elsevier
publishDate 2024
url https://hdl.handle.net/10037/33321
https://doi.org/10.1016/j.jsg.2024.105102
genre Balsfjord
Lyngen
Northern Norway
Tromsø
Lyngen
Troms
genre_facet Balsfjord
Lyngen
Northern Norway
Tromsø
Lyngen
Troms
op_relation Journal of Structural Geology
Höpfl S, Konopásek J, Sláma J. Influence of a rigid backstop on the flow pattern during thrusting of the supracrustal Balsfjord Series of the North Norwegian Caledonides. Journal of Structural Geology. 2024;182
FRIDAID 2257871
doi:10.1016/j.jsg.2024.105102
0191-8141
1873-1201
https://hdl.handle.net/10037/33321
op_rights Attribution 4.0 International (CC BY 4.0)
openAccess
Copyright 2024 The Author(s)
https://creativecommons.org/licenses/by/4.0
op_doi https://doi.org/10.1016/j.jsg.2024.105102
container_title Journal of Structural Geology
container_volume 182
container_start_page 105102
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