Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins

Schliffke, Nicholas and van Hunen, Jeroen and Gueydan, Frédéric and Magni, Valentina and Allen, Mark B. (2021) 'Curved orogenic belts, back-arc basins, and obduction as consequences of collision at irregular continental margins.', Geology, 49 (12). pp. 1436-1440.

Abstract

Continental collisions commonly involve highly curved passive plate margins, leading to diachronous continental subduction during trench rollback. Such systems may feature backarc 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.

Item Type:Article
Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution 4.0.
Download PDF (Advance Online Version )
(1646Kb)
Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution 4.0.
Download PDF
(1646Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1130/G48919.1
Publisher statement:© 2021 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license
Date accepted:21 June 2021
Date deposited:23 August 2021
Date of first online publication:12 August 2021
Date first made open access:23 August 2021

Save or Share this output

Export:
Export
Look up in GoogleScholar