- Title
- Buckling of orogens: insights from analogue modelling
- Creator
- Boutelier, D.; Gagnon, L.; Johnston, S.; Cruden, A.
- Relation
- Journal of Structural Geology Vol. 125, Issue August 2019, p. 213-217
- Publisher Link
- http://dx.doi.org/10.1016/j.jsg.2018.02.005
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2019
- Description
- Three-dimensional analogue models are employed to investigate whether oroclines may develop by horizontal buckling. A first series of experiments demonstrates that a crustal ribbon carried by a subducting plate cannot buckle and detach from its mantle root because it weakens and deforms when entering the subduction zone, such that little compressive stress is transferred through the ribbon. A second series of experiments shows that the aspect ratio of the ribbon impacts the wavelength of buckling and that the experimental tank employed is too small (maximum equivalent length is 1500 km) to generate multiple buckles. Finally, a third series of experiments shows that if the plate boundaries surrounding the ribbon resist its horizontal lateral motion, thrusts or strike-slip fault systems may be generated in the ribbon thereby preventing buckling. We conclude that oroclinal buckling is favoured when a crustal ribbon is pulled by subduction, causing backarc extension. Hence, buckling and bending models for orocline formation are not mutually exclusive but reinforce each other.
- Subject
- orocline; subduction; orogen; analogue modelling
- Identifier
- http://hdl.handle.net/1959.13/1469096
- Identifier
- uon:48149
- Identifier
- ISSN:0191-8141
- Language
- eng
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