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DOI	10.1016/j.tecto.2020.228474
	Interaction of folding and thrusting during fold-and-thrust-belt evolution: Insights from numerical simulations and application to the Swiss Jura and the Canadian Foothills
	Humair F.; Bauville A.; Epard J.-L.; Schmalholz S.M.
发表日期	2020
ISSN	00401951
卷号	789
英文摘要	We use two-dimensional numerical simulations to investigate the interaction of folding (buckling) and thrusting (localized shearing) during the structural evolution of fold-and-thrust belts (FTB). We model layer-parallel shortening of mechanically strong layers resting above a weaker layer, referred to as detachment. We consider a viscoplastic rheology with linear viscosity and frictional-plastic Drucker-Prager yield criterion. The detachment thickness is larger in one model half and only this geometrical thickness perturbation triggers folding and thrusting in the simulations. We conduct a systematic analysis to quantify the impact of model parameters, such as magnitude of the thickness perturbation or detachment rheology (frictional or viscous), on the FTB evolution. The magnitude of the perturbation determines whether, or not, folding is favoured over thrusting and, hence, controls the progressive interaction of folding and thrusting during FTB evolution. The asymmetry of modelled anticlines is proportional to the relative height of the initial perturbation. We also adapt the model configuration to specific mechanical stratigraphies of two regions in natural FTB, namely the Haute-Chaîne of the Jura Mountains (Switzerland) and the Foothills of Alberta (Canada). The modelled fold and thrust geometries agree with different types of observed anticlinal structures, such as symmetric detachments folds and asymmetric thrust-folds. Our results suggest that an initial stage of low-amplitude buckling likely occurred prior to the main folding and thrusting phase. We argue that folding and thrusting are equally important and interacting processes during the structural evolution of many natural FTB. © 2020 Elsevier B.V.
关键词	Finite elements numerical simulations Fold-and-thrust belts Folding Thin-skinned tectonics Thrusting
英文关键词	Buckling; Elasticity; Friction; Drucker Prager yield criterion; Fold-and-thrust belts; Initial perturbation; Layer parallel shortenings; Mechanical stratigraphy; Progressive interactions; Structural evolution; Two-dimensional numerical simulation; Numerical models; anticline; buckling; fold and thrust belt; geometry; numerical method; structural geology; viscoplasticity; Alberta; Canada; Jura [Switzerland]; Switzerland
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207777
作者单位	Institute of Earth Sciences, University of Lausanne, Lausanne, CH-1015, Switzerland
推荐引用方式 GB/T 7714	Humair F.,Bauville A.,Epard J.-L.,et al. Interaction of folding and thrusting during fold-and-thrust-belt evolution: Insights from numerical simulations and application to the Swiss Jura and the Canadian Foothills[J],2020,789.
APA	Humair F.,Bauville A.,Epard J.-L.,&Schmalholz S.M..(2020).Interaction of folding and thrusting during fold-and-thrust-belt evolution: Insights from numerical simulations and application to the Swiss Jura and the Canadian Foothills.Tectonophysics,789.
MLA	Humair F.,et al."Interaction of folding and thrusting during fold-and-thrust-belt evolution: Insights from numerical simulations and application to the Swiss Jura and the Canadian Foothills".Tectonophysics 789(2020).