Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins
International audience Abstract 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...
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ftunivnantes:oai:HAL:hal-03761831v1 2023-05-15T17:22:22+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 Department of Earth Sciences Durham Durham University Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Centre for Earth Evolution and Dynamics Oslo (CEED) Department of Geosciences Oslo Faculty of Mathematics and Natural Sciences Oslo University of Oslo (UiO)-University of Oslo (UiO)-Faculty of Mathematics and Natural Sciences Oslo University of Oslo (UiO)-University of Oslo (UiO) School of Psychology Wollongong Faculty of Social Sciences Wollongong University of Wollongong Australia -University of Wollongong Australia 2021-08-12 https://hal.science/hal-03761831 https://doi.org/10.1130/G48919.1 en eng HAL CCSD Geological Society of America info:eu-repo/semantics/altIdentifier/doi/10.1130/G48919.1 hal-03761831 https://hal.science/hal-03761831 doi:10.1130/G48919.1 ISSN: 0091-7613 EISSN: 0091-7613 Geology https://hal.science/hal-03761831 Geology, 2021, 49 (12), pp.1436-1440. ⟨10.1130/G48919.1⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2021 ftunivnantes https://doi.org/10.1130/G48919.1 2023-03-08T01:29:24Z International audience Abstract 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 Université de Nantes: HAL-UNIV-NANTES Geology 49 12 1436 1440 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Schliffke, Nicholas van Hunen, Jeroen Gueydan, Frédéric Magni, Valentina Allen, Mark Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Abstract 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. |
author2 |
Department of Earth Sciences Durham Durham University Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Centre for Earth Evolution and Dynamics Oslo (CEED) Department of Geosciences Oslo Faculty of Mathematics and Natural Sciences Oslo University of Oslo (UiO)-University of Oslo (UiO)-Faculty of Mathematics and Natural Sciences Oslo University of Oslo (UiO)-University of Oslo (UiO) School of Psychology Wollongong Faculty of Social Sciences Wollongong University of Wollongong Australia -University of Wollongong Australia |
format |
Article in Journal/Newspaper |
author |
Schliffke, Nicholas van Hunen, Jeroen Gueydan, Frédéric Magni, Valentina Allen, Mark |
author_facet |
Schliffke, Nicholas van Hunen, Jeroen Gueydan, Frédéric Magni, Valentina Allen, Mark |
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 |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03761831 https://doi.org/10.1130/G48919.1 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
ISSN: 0091-7613 EISSN: 0091-7613 Geology https://hal.science/hal-03761831 Geology, 2021, 49 (12), pp.1436-1440. ⟨10.1130/G48919.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1130/G48919.1 hal-03761831 https://hal.science/hal-03761831 doi:10.1130/G48919.1 |
op_doi |
https://doi.org/10.1130/G48919.1 |
container_title |
Geology |
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49 |
container_issue |
12 |
container_start_page |
1436 |
op_container_end_page |
1440 |
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1766108979267633152 |