Timing of collision initiation and location of the Scandian orogenic suture in the Scandinavian Caledonides
The Scandinavian Caledonides represent a classical example of a deeply eroded Himalayan-style orogen formed during Baltica–Laurentia continent collision. We propose that initial contact along continental-margin promontories led to a drop in convergence rate, resulting in increased slab rollback alon...
| Main Authors: | , |
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| Format: | Journal Article |
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Blackwell Publishing Ltd
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/67086 |
| _version_ | 1848761471540920320 |
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| author | Slagstad, T. Kirkland, Chris |
| author_facet | Slagstad, T. Kirkland, Chris |
| author_sort | Slagstad, T. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The Scandinavian Caledonides represent a classical example of a deeply eroded Himalayan-style orogen formed during Baltica–Laurentia continent collision. We propose that initial contact along continental-margin promontories led to a drop in convergence rate, resulting in increased slab rollback along parts of the margin still undergoing oceanic subduction. Slab rollback caused extension of the overlying lithosphere with orogen-wide emplacement of mafic layered intrusions, ophiolite formation and bimodal magmatism at 438–434 Ma, in what immediately thereafter became the upper plate (Laurentia) in the Scandian continent–continent collision. A compilation of magmatic ages provides evidence of long-lived, Ordovician arc magmatism in units above the suture, which is essentially absent below the suture. This model provides a tight constraint on the timing of collision initiation, and provides a framework by which tectonic units comprising the Scandinavian Caledonides can be assigned a Baltican or more exotic heritage. |
| first_indexed | 2025-11-14T10:32:12Z |
| format | Journal Article |
| id | curtin-20.500.11937-67086 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:32:12Z |
| publishDate | 2018 |
| publisher | Blackwell Publishing Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-670862018-12-12T01:51:58Z Timing of collision initiation and location of the Scandian orogenic suture in the Scandinavian Caledonides Slagstad, T. Kirkland, Chris The Scandinavian Caledonides represent a classical example of a deeply eroded Himalayan-style orogen formed during Baltica–Laurentia continent collision. We propose that initial contact along continental-margin promontories led to a drop in convergence rate, resulting in increased slab rollback along parts of the margin still undergoing oceanic subduction. Slab rollback caused extension of the overlying lithosphere with orogen-wide emplacement of mafic layered intrusions, ophiolite formation and bimodal magmatism at 438–434 Ma, in what immediately thereafter became the upper plate (Laurentia) in the Scandian continent–continent collision. A compilation of magmatic ages provides evidence of long-lived, Ordovician arc magmatism in units above the suture, which is essentially absent below the suture. This model provides a tight constraint on the timing of collision initiation, and provides a framework by which tectonic units comprising the Scandinavian Caledonides can be assigned a Baltican or more exotic heritage. 2018 Journal Article http://hdl.handle.net/20.500.11937/67086 10.1111/ter.12324 Blackwell Publishing Ltd restricted |
| spellingShingle | Slagstad, T. Kirkland, Chris Timing of collision initiation and location of the Scandian orogenic suture in the Scandinavian Caledonides |
| title | Timing of collision initiation and location of the Scandian orogenic suture in the Scandinavian Caledonides |
| title_full | Timing of collision initiation and location of the Scandian orogenic suture in the Scandinavian Caledonides |
| title_fullStr | Timing of collision initiation and location of the Scandian orogenic suture in the Scandinavian Caledonides |
| title_full_unstemmed | Timing of collision initiation and location of the Scandian orogenic suture in the Scandinavian Caledonides |
| title_short | Timing of collision initiation and location of the Scandian orogenic suture in the Scandinavian Caledonides |
| title_sort | timing of collision initiation and location of the scandian orogenic suture in the scandinavian caledonides |
| url | http://hdl.handle.net/20.500.11937/67086 |