Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins
Continental collisions commonly involve highly curved passive plate margins, leading to diachronous continental subduction during trench rollback. Such systems may feature back-arc extension and ophiolite obduction postdating initial collision. Modern examples include the Alboran and Banda arcs. Anc...
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2021
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ftoslouniv:oai:www.duo.uio.no:10852/89029 2023-05-15T17:22:25+02:00 Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins Schliffke, Nicholas van Hunen, Jeroen Gueydan, Frédéric Magni, Valentina Allen, Mark B. 2021-09-29T14:14:03Z http://hdl.handle.net/10852/89029 http://urn.nb.no/URN:NBN:no-91638 https://doi.org/10.1130/G48919.1 EN eng NFR/223272 http://urn.nb.no/URN:NBN:no-91638 Schliffke, Nicholas van Hunen, Jeroen Gueydan, Frédéric Magni, Valentina Allen, Mark B. . Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins. Geology. 2021 http://hdl.handle.net/10852/89029 1940625 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Geology&rft.volume=&rft.spage=&rft.date=2021 Geology https://doi.org/10.1130/G48919.1 URN:NBN:no-91638 Fulltext https://www.duo.uio.no/bitstream/handle/10852/89029/2/2021_Schliffke_etal_Geology_BackarcInversion.pdf Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ CC-BY 0091-7613 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2021 ftoslouniv https://doi.org/10.1130/G48919.1 2021-10-27T22:32:30Z Continental collisions commonly involve highly curved passive plate margins, leading to diachronous continental subduction during trench rollback. Such systems may feature back-arc extension and ophiolite obduction postdating initial collision. Modern examples include the Alboran and Banda arcs. Ancient systems include the Newfoundland and Norwegian Caledonides. While external forces or preexisting weaknesses are often invoked, we suggest that ophiolite obduction can equally be caused by internal stress buildup during collision. Here, we modeled collision with an irregular subducting continental margin in three-dimensional (3-D) thermo-mechanical models and used the generated stress field evolution to understand resulting geologic processes. Results show how tensional stresses are localized in the overriding plate during the diachronous onset of collision. These stresses thin the overriding plate and may open a back-arc spreading center. Collision along the entire trench follows rapidly, with inversion of this spreading center, ophiolite obduction, and compression in the overriding plate. The models show how subduction of an irregular continental margin can form a highly curved orogenic belt. With this mechanism, obduction of back-arc oceanic lithosphere naturally evolves from a given initial margin geometry during continental collision. Article in Journal/Newspaper Newfoundland Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Geology 49 12 1436 1440 |
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Open Polar |
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Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Continental collisions commonly involve highly curved passive plate margins, leading to diachronous continental subduction during trench rollback. Such systems may feature back-arc extension and ophiolite obduction postdating initial collision. Modern examples include the Alboran and Banda arcs. Ancient systems include the Newfoundland and Norwegian Caledonides. While external forces or preexisting weaknesses are often invoked, we suggest that ophiolite obduction can equally be caused by internal stress buildup during collision. Here, we modeled collision with an irregular subducting continental margin in three-dimensional (3-D) thermo-mechanical models and used the generated stress field evolution to understand resulting geologic processes. Results show how tensional stresses are localized in the overriding plate during the diachronous onset of collision. These stresses thin the overriding plate and may open a back-arc spreading center. Collision along the entire trench follows rapidly, with inversion of this spreading center, ophiolite obduction, and compression in the overriding plate. The models show how subduction of an irregular continental margin can form a highly curved orogenic belt. With this mechanism, obduction of back-arc oceanic lithosphere naturally evolves from a given initial margin geometry during continental collision. |
format |
Article in Journal/Newspaper |
author |
Schliffke, Nicholas van Hunen, Jeroen Gueydan, Frédéric Magni, Valentina Allen, Mark B. |
spellingShingle |
Schliffke, Nicholas van Hunen, Jeroen Gueydan, Frédéric Magni, Valentina Allen, Mark B. Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins |
author_facet |
Schliffke, Nicholas van Hunen, Jeroen Gueydan, Frédéric Magni, Valentina Allen, Mark B. |
author_sort |
Schliffke, Nicholas |
title |
Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins |
title_short |
Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins |
title_full |
Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins |
title_fullStr |
Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins |
title_full_unstemmed |
Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins |
title_sort |
curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins |
publishDate |
2021 |
url |
http://hdl.handle.net/10852/89029 http://urn.nb.no/URN:NBN:no-91638 https://doi.org/10.1130/G48919.1 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
0091-7613 |
op_relation |
NFR/223272 http://urn.nb.no/URN:NBN:no-91638 Schliffke, Nicholas van Hunen, Jeroen Gueydan, Frédéric Magni, Valentina Allen, Mark B. . Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins. Geology. 2021 http://hdl.handle.net/10852/89029 1940625 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Geology&rft.volume=&rft.spage=&rft.date=2021 Geology https://doi.org/10.1130/G48919.1 URN:NBN:no-91638 Fulltext https://www.duo.uio.no/bitstream/handle/10852/89029/2/2021_Schliffke_etal_Geology_BackarcInversion.pdf |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1130/G48919.1 |
container_title |
Geology |
container_volume |
49 |
container_issue |
12 |
container_start_page |
1436 |
op_container_end_page |
1440 |
_version_ |
1766109056663027712 |